WO2024186172A1 - 선박용 이산화탄소 포집 시스템 - Google Patents
선박용 이산화탄소 포집 시스템 Download PDFInfo
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- WO2024186172A1 WO2024186172A1 PCT/KR2024/003043 KR2024003043W WO2024186172A1 WO 2024186172 A1 WO2024186172 A1 WO 2024186172A1 KR 2024003043 W KR2024003043 W KR 2024003043W WO 2024186172 A1 WO2024186172 A1 WO 2024186172A1
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- carbon dioxide
- steam
- main
- exhaust gas
- low
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/004—Exhaust or silencing apparatus characterised by constructional features specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/011—Exhaust or silencing apparatus characterised by constructional features having two or more purifying devices arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
- F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/06—Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/40—Combinations of exhaust-steam and smoke-gas preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a carbon dioxide capture system for a ship, and more particularly, to a carbon dioxide capture system for a ship that generates low-temperature steam using exhaust gas waste heat to heat an absorbent to a regeneration temperature and separates carbon dioxide.
- Maritime transport accounts for approximately 80% of world trade and is the most economical and common means of transport for long-distance cargo transport.
- the engines of large cargo ships and cruise ships generally use heavy oil with high sulfur content.
- the exhaust gas contains large amounts of carbon dioxide (CO2) and sulfur dioxide (SO2). These pollutants are not only harmful to the human body, but also cause environmental pollution when released into the atmosphere without filtering.
- the UN has delegated the issue of regulating exhaust gas emissions from ships sailing all seas around the world to the International Maritime Organization (IMO), and the IMO is pursuing various exhaust gas reduction measures with the goal of reducing environmental pollutants from exhaust gas emitted from ships by 40% by 2030 and by 50% by 2050 compared to 2008.
- IMO International Maritime Organization
- the purpose of the present invention is to provide a carbon dioxide capture system for a ship that can save fuel consumed for absorbent regeneration by generating low-temperature steam using exhaust gas waste heat to raise the temperature of the absorbent to the regeneration temperature of the carbon dioxide absorbent.
- Another object of the present invention is to improve the efficiency of the carbon dioxide absorption process by lowering the temperature of exhaust gas used in the carbon dioxide absorption process.
- Another object of the present invention is to provide a carbon dioxide capture system for ships suitable for an amine-based absorbent, which can supply low-temperature steam to a reboiler, thereby preventing the performance of the amine-based absorbent from deteriorating due to high temperature.
- Another object of the present invention is to provide a carbon dioxide capture system for a ship, which can save fuel consumed for absorbent regeneration by generating low-temperature steam using waste heat of high-temperature exhaust gas generated in a methane oxidation catalytic reactor.
- a carbon dioxide capture system for a ship includes a carbon dioxide capture device that removes carbon dioxide contained in exhaust gas of a main engine; a low-temperature steam generation unit that generates steam by heat exchange with exhaust gas of an auxiliary engine; and a low-temperature steam supply line that supplies the steam generated in the low-temperature steam generation unit to the carbon dioxide capture device.
- the apparatus further includes a methane oxidation catalytic reactor provided between the auxiliary engine and the low-temperature steam generation unit to remove methane contained in exhaust gas of the auxiliary engine, and the low-temperature steam generation unit can generate steam by heat exchange with exhaust gas passing through the methane oxidation catalytic reactor.
- the low-temperature steam supply line may be provided with a steam tank for separating liquid water within the steam.
- the low-temperature steam generating unit is a sub-economizer, and the steam may be low-temperature steam having a temperature condition of 100°C or higher and less than 165°C under a pressure condition of less than 6 barg.
- a first steam valve may be provided on the low-temperature steam supply line to control the amount of steam supplied to the carbon dioxide capture device.
- the system may include a main economizer for generating main steam by heat exchange with exhaust gas of the main engine; a boiler for generating high-temperature boiler steam by receiving main steam preheated in the main economizer; and a second steam valve provided on an additional supply line for supplying high-temperature boiler steam generated in the boiler to the carbon dioxide capture device, the second steam valve converting the high-temperature boiler steam into low-temperature steam.
- the system may further include: a main economizer provided on a main engine exhaust line connecting the main engine and the carbon dioxide capture device to generate main steam by heat exchange with exhaust gas of the main engine; a second low-temperature steam generation unit provided on the main engine exhaust line at a rear end of the main economizer to generate second steam by heat exchange with the main engine exhaust gas passing through the main economizer; and a second low-temperature steam supply line supplying the second steam generated in the second low-temperature steam generation unit to the carbon dioxide capture device.
- the main engine or the auxiliary engine can use dual fuel.
- the present invention comprises: a carbon dioxide capture device for removing carbon dioxide contained in exhaust gas of a main engine; a main economizer for generating main steam by heat exchange with the exhaust gas of the main engine; a composite low-temperature steam generation unit for generating steam by supplying the main engine exhaust gas and the auxiliary engine exhaust gas that have passed through the main economizer together; and a low-temperature steam supply line for supplying the steam generated in the composite low-temperature steam generation unit to the carbon dioxide capture device.
- the system further includes a boiler that receives main steam preheated by the main economizer to generate high-temperature boiler steam, and at least a portion of the boiler exhaust gas generated in the boiler can be supplied to the composite low-temperature steam generating unit.
- a carbon dioxide capture system for a ship includes: a carbon dioxide capture device for removing carbon dioxide contained in exhaust gas of a main engine; a low-temperature steam generation unit for generating steam by heat exchange with exhaust gas of an auxiliary engine; and a low-temperature steam supply line for supplying the steam generated in the low-temperature steam generation unit to the carbon dioxide capture device, wherein at least a portion of the auxiliary engine exhaust gas passing through the low-temperature steam generation unit joins a main engine exhaust line connecting between the main engine and the carbon dioxide capture device.
- the system further includes a main economizer provided in the main engine exhaust line to generate main steam by heat exchange with exhaust gas of the main engine, and at least a portion of the auxiliary engine exhaust gas passing through the low-temperature steam generating unit can be joined to the main engine exhaust line at the rear end of the main economizer.
- the system further includes a boiler which receives main steam preheated by the main economizer and generates high-temperature boiler steam, and at least a portion of the boiler exhaust gas generated by the boiler can be joined to the main engine exhaust line at the rear end of the main economizer.
- a main economizer is provided on the main engine exhaust line to generate main steam by heat exchange with exhaust gas of the main engine;
- a branch line is branched from the main engine exhaust line at the rear end of the main economizer and connected to an auxiliary engine exhaust line connecting between the auxiliary engine and the low-temperature steam generation unit, and at least a portion of the main engine exhaust gas passing through the main economizer can be supplied to the low-temperature steam generation unit through the branch line.
- the main engine or the auxiliary engine can use liquid fuel.
- low-temperature steam is generated by using exhaust gas waste heat to raise the temperature of the carbon dioxide absorbent to the regeneration temperature of the absorbent, thereby saving fuel consumed for absorbent regeneration.
- the efficiency of the carbon dioxide absorption process can be improved by lowering the temperature of the exhaust gas used in the carbon dioxide absorption process.
- low-pressure steam can be supplied to the reboiler, thereby preventing the absorbent from deteriorating in performance due to high temperature.
- FIG. 1 is a drawing illustrating a carbon dioxide capture system for a ship according to a first embodiment of the present invention.
- FIG. 2 is a drawing illustrating a carbon dioxide capture device for a ship according to the first embodiment of the present invention.
- Figure 3 is a table showing the loss rate according to temperature of an amine-based absorbent.
- Figure 4 is a table showing saturated steam conditions.
- FIG. 5 is a diagram illustrating a steam-water circulation path of a carbon dioxide capture system for a ship according to the first embodiment of the present invention.
- FIG. 6 is a drawing illustrating a carbon dioxide capture system for a ship according to a second embodiment of the present invention.
- FIG. 7 is a drawing illustrating a carbon dioxide capture system for a ship according to a third embodiment of the present invention.
- FIG. 8 is a drawing illustrating a carbon dioxide capture system for a ship according to the fourth embodiment of the present invention.
- FIG. 9 is a drawing illustrating a carbon dioxide capture system for a ship according to the fifth embodiment of the present invention.
- FIG. 10 is a drawing illustrating a carbon dioxide capture system for a ship according to the sixth embodiment of the present invention.
- FIG. 11 is a drawing illustrating a carbon dioxide capture system for a ship according to one of the best embodiments of the present invention.
- FIG. 12 is a drawing illustrating a carbon dioxide capture system for a ship according to another optimal embodiment of the present invention.
- forward/backward, left/right, and up/down directions are referred to for convenience of explanation and may be directions orthogonal to each other.
- FIG. 1 is a drawing illustrating an exhaust gas treatment device including a carbon dioxide capture system for a ship according to a first embodiment of the present invention.
- the carbon dioxide capture system for a ship includes a carbon dioxide capture device (140) for removing carbon dioxide included in exhaust gas of a main engine (111); a low-temperature steam generation unit (150) for generating steam by heat exchange with exhaust gas of an auxiliary engine (121); and a low-temperature steam supply line (155) for supplying the steam generated in the low-temperature steam generation unit (150) to the carbon dioxide capture device (140).
- Exhaust gases emitted from ship engines contain air pollutants and greenhouse gases such as nitrogen oxides (NOx), sulfur oxides (SOx), and carbon dioxide (CO2).
- NOx nitrogen oxides
- SOx sulfur oxides
- CO2 carbon dioxide
- a method of reducing nitrogen oxides, sulfur oxides, and particulate matter (PM) emissions by lowering the sulfur content in the fuel based on the use of alternative fuels such as methanol, liquefied natural gas (LNG), and emulsified fuel instead of diesel as a pretreatment method.
- alternative fuels such as methanol, liquefied natural gas (LNG), and emulsified fuel instead of diesel as a pretreatment method.
- Each pollutant can be removed through a process of removing it in a post-processing manner. It may include a nitrogen oxide absorption unit (not shown) for removing nitrogen oxides, a sulfur oxide removal unit (not shown) for removing sulfur oxides (SOx), and a carbon dioxide capture device (140) for removing carbon dioxide.
- the pollutants generated may vary, and the nitrogen oxide absorber, sulfur oxide absorber, and carbon dioxide capture device (140) may all be included or some may be omitted.
- the nitrogen oxide absorption unit can remove nitrogen oxides in exhaust gas by supplying an absorption liquid such as ammonia (NH3) into the chamber.
- an absorption liquid such as ammonia (NH3)
- NH3 ammonia
- exhaust gas passing through the nitrogen oxide removal unit can be supplied to the sulfur oxide removal unit.
- Sulfur oxide removal units to reduce sulfur oxide (SOx) emissions from industrial processes have been used on land for about 100 years, but they have only been installed on ships for about 30 years. In the case of ships, there are differences from scrubbers on land due to space constraints.
- Sulfur oxides (SOx) in exhaust gas are acidic substances, so alkaline substances can be used as sulfur oxide absorbents to neutralize them, or seawater, which is a natural alkaline substance, can be used as a sulfur oxide absorbent.
- Seawater is slightly alkaline due to bicarbonate in the seawater, and the solubility of sulfur oxides (SOx) in seawater containing bicarbonate is about 2-3 times higher than that of fresh water.
- Seawater (SW) is introduced into the ship and sprayed into the chamber of the sulfur oxide removal unit supplied with exhaust gas. It reacts with sulfur oxides (SOx), such as sulfur dioxide (SO2) or sulfur trioxide (SO3), in the exhaust gas and is converted into sulfurous acid (H2SO3, sulfurous acid) or sulfuric acid (H2SO4, sulfuric acid) aqueous solutions.
- SOx sulfur oxides
- SO2 sulfur dioxide
- SO3 sulfur trioxide
- sulfuric acid H2SO4, sulfuric acid
- the effluent discharged from the sulfur oxide removal unit contains sulfuric acid or sulfurous acid, so it has high acidity and contains pollutants other than sulfuric acid and sulfurous acid. Therefore, an additional water treatment system can be installed to control the acidity and remove pollutants before disposing of it into the sea.
- CO2 carbon dioxide
- SO2 carbon dioxide
- Carbon dioxide absorbents include amino acids having amine groups, amino acid mimics containing amine and carboxyl groups, or alkali metal salts thereof. When these substances are dissolved in water together with a catalyst and passed through carbon dioxide, they can combine with carbon dioxide to produce byproducts.
- the absorbent in order to store or process the absorbent that has captured carbon dioxide, separate storage space and processing costs are consumed.
- the absorbent can be regenerated and recycled, but the regeneration temperature of the absorbent is different from the carbon dioxide absorption temperature, so heat is required to regenerate the absorbent. If the boiler fuel is used for this heat for regenerating the absorbent, there is a problem that additional carbon dioxide is generated and the cost for regenerating the absorbent increases.
- the carbon dioxide capture device (140) may include a supply gas cooler (148) that cools exhaust gas to an absorption temperature required for carbon dioxide absorption, a carbon dioxide absorption chamber (146) to which carbon dioxide absorbent supplied from an absorbent tank (149) and exhaust gas temperature-controlled through the supply gas cooler (148) are supplied, an absorbent regeneration chamber (141) in which the absorbent is regenerated, a reboiler (142) that supplies heat for absorbent regeneration, and an exhaust gas washing unit (147) that washes exhaust gas discharged from the carbon dioxide absorption chamber (146).
- a supply gas cooler (148) that cools exhaust gas to an absorption temperature required for carbon dioxide absorption
- a carbon dioxide absorption chamber (146) to which carbon dioxide absorbent supplied from an absorbent tank (149) and exhaust gas temperature-controlled through the supply gas cooler (148) are supplied
- an absorbent regeneration chamber (141) in which the absorbent is regenerated in which the absorbent is regenerated
- a reboiler (142) that supplies heat
- a supply gas cooler (148) may be additionally provided within the carbon dioxide capture device (140). Alternatively, only one of the precooler (115) and the supply gas cooler (148) may be provided. In order to increase carbon dioxide absorption efficiency, exhaust gas supplied along the main engine exhaust line (ML) connecting the main engine (111) and the carbon dioxide capture device (140) may be introduced into the supply gas cooler (148) to adjust the required absorption temperature (for example, about 30-40°C for an amine-based absorbent) depending on the type of carbon dioxide absorbent. However, in some cases, only one of the precooler (115) and the supply gas cooler (148) may be present, so there is no limitation on the number of coolers.
- the carbon dioxide absorption chamber (146) includes an exhaust gas inlet through which exhaust gas containing carbon dioxide is introduced, an absorbent supply section through which regenerated carbon dioxide absorbent is supplied, a drain port through which waste absorbent that has absorbed carbon dioxide is discharged and introduced into an absorbent regeneration chamber (141), and an exhaust gas outlet through which exhaust gas from which carbon dioxide has been removed is discharged.
- the exhaust gas inlet is located at the lower side of the carbon dioxide absorption chamber (146) and the exhaust gas outlet is located at the upper side so that the exhaust gas can move from the lower side to the upper side of the carbon dioxide absorption chamber (146).
- the spray unit may include a spray unit that sprays an absorbent inside the carbon dioxide absorption chamber (146).
- the spray unit includes a nozzle that sprays in the form of fine particles and supplies the absorbent to the exhaust gas inside the carbon dioxide absorption chamber (146).
- the absorbent may be an amine-based absorbent and may include at least one of MEA (Mono Ethanol Amine), MDEA (Methyl Diethanol Amine), DEA (Diethanol Amine), and DGA (Diglycol Amin). Only representative amine-based absorbents have been mentioned, and other types of amine-based absorbents may be used.
- the amine-based absorbent has an excellent carbon dioxide absorption rate in a temperature range of about 30-40°C. Therefore, it is desirable to maintain the temperature (absorption temperature) within the carbon dioxide absorption chamber (146) of the carbon dioxide capture device (140) at about 30-40°C.
- the supply gas cooler (148) described above can be used.
- the injection unit may be located above the carbon dioxide absorption chamber (146). By injecting the absorbent from the upper side of the carbon dioxide absorption chamber (146), the area in contact with the exhaust gas can be maximized.
- the exhaust gas from which carbon dioxide has been removed can be discharged into the air after having pollutants washed once more with water in the exhaust gas washing unit (147).
- carbon dioxide in the exhaust gas can be supplied to the absorbent regeneration chamber (141) through a drain located at the bottom of the carbon dioxide absorption chamber (146) in a dissolved state by the absorbent.
- the carbon dioxide contained in the absorbent is separated by heating at a high temperature to vaporize the carbon dioxide in the absorbent.
- the regeneration temperature at which the carbon dioxide is separated in the absorbent regeneration chamber (141) is about 100 to 120°C, which is a temperature difference of more than 60°C from the absorption temperature (30 to 40°C). Therefore, external heat supply is required for absorbent regeneration, and the absorbent can be heated through the reboiler (142).
- additional carbon dioxide may be generated during the combustion process of the reboiler (142), and the problem of lowering the efficiency of the entire system may occur depending on the amount of reboiler (142) used.
- the temperature difference between the two chambers (146, 141) can be compensated through an absorbent heat exchanger (145) that exchanges heat between the absorbent recovery line (143) that absorbs carbon dioxide in the carbon dioxide absorption chamber (146) and supplies it to the absorbent regeneration chamber (141) and the absorbent supply line (144) that supplies the absorbent regenerated in the absorbent regeneration chamber (141) to the carbon dioxide absorption chamber (146).
- the temperature can be compensated through heat exchange between the low-temperature absorbent passing through the absorbent recovery line (143) and the high-temperature absorbent passing through the absorbent supply line (144), and the temperature of the absorbent supplied to the absorbent regeneration chamber (141) can be increased to a level of 70 to 90°C.
- the absorbent regeneration chamber (141) may use a reboiler (142) to raise the absorbent to the regeneration temperature.
- the reboiler (142) heats the absorbent to the regeneration temperature using steam.
- the saturated steam state is used to maximize the energy of the steam.
- the steam supplied to the reboiler (142) may use steam higher than the regeneration temperature so as to raise the absorbent supplied to the absorbent regeneration chamber (141) at 70 to 90°C to the regeneration temperature of 100 to 120°C. Considering the temperature increase efficiency, the higher the temperature of the steam, the faster the temperature of the absorbent can be raised.
- amine-based absorbents undergo transformation at high temperatures, they are difficult to reuse after a certain period of time and must be replaced. Therefore, if the steam heated in the reboiler (142) is too high a temperature, the transformation of the absorbent may be accelerated.
- Fig. 3 is a graph showing the rate at which loss occurs due to transformation of an amine-based absorbent depending on temperature.
- the absorbent may include components such as MEA (Mono Ethanol Amine), MDEA (Methyl Diethanol Amine), DEA (Diethanol Amine), and DGA (Diglycol Amin), and may exhibit different characteristics depending on the ratio.
- the loss rate varies depending on the type and mixing ratio of the absorbent, but loss occurs at about 120 to 150°C, and the loss of most absorbents increases significantly above 150 to 175°C.
- low-temperature steam of 100°C or higher and less than 165°C for the temperature of the absorbent supplied to the reboiler (142) to ensure absorbent heating efficiency and prevent absorbent loss.
- Fig. 4 is a table showing saturated steam conditions, and the temperature for forming saturated steam at a specific pressure can be confirmed.
- low-temperature steam having a temperature range of 100°C or more and less than 165°C can be generated under pressure conditions of less than 6 barg.
- saturated steam (L) having a temperature range of 134 ⁇ 152°C can be used under a pressure of 2 ⁇ 4 barg.
- steam provided by the onboard boiler is generally steam of 165°C or higher and 6barg or higher, and since this is relatively high temperature compared to the steam required for absorbent regeneration, it is referred to as high temperature steam.
- steam required for absorbent regeneration is generally relatively low temperature compared to the steam provided by the onboard boiler, so it is referred to as low temperature steam.
- the present invention utilizes waste heat from exhaust gas to generate low-temperature steam to extend the life of the absorbent by lowering the absorbent loss rate, and supply the low-temperature steam to the reboiler (142) of the carbon dioxide capture device (140) through the low-temperature steam supply line (155).
- the low-temperature steam supply line (155) is defined as a pipe line connecting the low-temperature steam generation unit (150) to the reboiler (142) of the carbon dioxide capture device (140).
- At least a portion of the carbon dioxide-containing absorbent flowing in from the upper portion of the absorbent regeneration chamber (141) may be branched off through the regeneration branch line (131), heat-exchanged with the relatively high-temperature regenerated absorbent in the absorbent supply line (144) in the regeneration heat exchanger (132), and then resupplied to the absorbent regeneration chamber (141) through the resupply line (133).
- Carbon dioxide gas separated in the absorbent regeneration chamber (141) can be stored or used where needed after going through a carbon dioxide liquefaction process.
- the low-temperature steam generation unit (150) generates steam by exchanging heat with the exhaust gas of the auxiliary engine (121), and the steam generated in the low-temperature steam generation unit (150) is supplied to the reboiler (142) of the carbon dioxide capture device (140) through the low-temperature steam supply line (155).
- the temperature of the exhaust gas of the main engine (111) is approximately 250 degrees
- the temperature of the exhaust gas of the auxiliary engine (121) is 300 to 400 degrees, so it is most desirable in terms of energy efficiency to utilize the waste heat of the exhaust gas of the auxiliary engine (121). Therefore, the low-temperature steam generation unit (150) utilizes the exhaust gas of the auxiliary engine (121).
- the low-temperature steam generation unit (150) may be a sub-economizer (152) that generates low-temperature steam using exhaust gas waste heat of the auxiliary engine (121).
- the main engine (111) is the main power source for operating the ship
- the auxiliary engine (121) is a power generation engine that is driven independently of the main engine (111) and supplies electric power to the ship in addition to the main engine. Since the auxiliary engine (121) does not emit much exhaust gas compared to the main engine (111), an exhaust gas treatment process for removing substances such as carbon dioxide or sulfur dioxide in the exhaust gas can be omitted depending on the type of fuel. For example, in the case of a ship that uses LNG as fuel or a dual fuel (gas/diesel) ship, the exhaust gas of the auxiliary engine (121) can be released into the atmosphere independently of the exhaust gas of the main engine (111).
- High-temperature steam can be generated in the main economizer (112) and boiler (154) by utilizing the waste heat of the exhaust gas generated when the main engine (111) is driven.
- the main economizer (112) increases the temperature of water by utilizing the waste heat of the main engine (111), and the boiler (154) can generate high-temperature steam by utilizing the steam/water preheated in the main economizer (112).
- the high-temperature steam generated in the boiler (154) can be supplied to other demand sources in the ship.
- the high-temperature steam of the boiler (154) can be converted into low-temperature steam by lowering the temperature and supplied to the reboiler (142). This will be described later with reference to the second steam valve (V2).
- the temperature of the exhaust gas discharged through the exhaust gas discharge pipe (114) is still high, so it can be cooled to the absorption temperature in the precooler (115) and then supplied to the carbon dioxide capture device (140).
- exhaust gas generated from the main engine (111) is illustrated as being supplied to a carbon dioxide capture device (140) through an exhaust gas supply pipe (119) branched from an exhaust gas discharge pipe (114), but a carbon dioxide capture device (140) may be provided on the exhaust gas discharge pipe (114), and thus is not limited to what is illustrated in Fig. 1.
- the first embodiment can be applied to a case where the main engine (111) or the auxiliary engine (121) uses dual fuel (gas/diesel), but is not limited thereto.
- low-temperature steam can be generated by utilizing waste heat of exhaust gas of the auxiliary engine (121) and used for absorbent regeneration.
- at least a portion of the exhaust gas of the main engine (111) can be supplied to the carbon dioxide capture device (140).
- FIG. 5 is a diagram illustrating a steam-water circulation path of a carbon dioxide capture system for a ship according to the first embodiment of the present invention.
- the steam-water circulation path can be applied equally to all other embodiments.
- the amount of heat of exhaust gas generated from the auxiliary engine (121) may vary depending on the temperature of the atmosphere, the characteristics of the fuel, and the amount of electricity used according to the ship's operating conditions.
- the amount of steam generated from the sub-economizer (152) may be greater than the amount of steam required from the reboiler (142).
- a first steam valve (V1) for bypassing and discharging excess steam supplied from the steam tank (153) to the reboiler (142) may be included.
- the first steam valve (V1) is provided on the low-temperature steam supply line (155) and can control the amount of steam supplied to the reboiler (142) of the carbon dioxide capture device (140).
- the first steam valve (V1) may be in the form of a 3-way valve.
- the first steam valve (V1) may be arranged at the position shown in FIG. 1, and there is no limitation on the arrangement position.
- Excess steam generated in the sub-economizer (152) is supplied to the drain cooler (157) through the first steam valve (V1) to be liquefied, stored in the feedback water tank (158), and then supplied to the boiler (154) or steam tank (153) if necessary.
- excess steam generated in the sub-economizer (152) may be supplied to and used by other demand sources.
- a boiler (154) may be used to additionally supply steam.
- the boiler (154) may be a dedicated boiler (154) for the reboiler (142), or may be a boiler (154) that supplies high-temperature steam to other devices in the ship.
- the boiler (154) may generate steam by burning additional fuel independently of the engine.
- the boiler (154) may receive main steam preheated from the main economizer (112) to generate high-temperature boiler steam.
- V2 a second steam valve that converts high-temperature boiler steam into low-temperature steam may be included.
- High temperature boiler steam of 165°C or higher generated in the boiler (154) is converted into low temperature steam having a temperature range of 100°C or higher and less than 165°C under a pressure condition of less than 6 barg while passing through the second steam valve (V2).
- V2 second steam valve
- it is converted into low temperature steam having a temperature range of 134°C to 152°C under a pressure of 2 to 4 barg.
- the second steam valve (V2) is provided on an additional supply line (159) connecting the boiler (154) and the low-temperature steam supply line (155), but is not limited thereto.
- the additional supply line (159) may be defined as a pipeline that directly connects the boiler (154) and the reboiler (142) of the carbon dioxide capture device (140). That is, the low-temperature steam supply line (155) through the sub-economizer (152) and the additional supply line (159) through the boiler (154) may each be connected to the reboiler (142), or may be combined and connected as one line.
- the excess steam generated in the boiler (154) can be discharged to the drain cooler (157) through the third steam valve (V3).
- the excess steam generated in the boiler (154) can be supplied to and used by other demanders.
- the low-temperature steam supplied with heat from the absorbent in the reboiler (142) may be liquefied into water and may include a water recovery line (156) for recovering the liquefied water.
- the steam generated in excess in the sub-economizer (152) may be liquefied by supplying it to the drain cooler (157) through the first steam valve (V1), and also the steam generated in excess in the boiler (154) may be liquefied by supplying it to the drain cooler (157) through the third steam valve (V3).
- the water stored in the feedback water tank (158) may be supplied to the boiler (154) or the steam tank (153) if necessary.
- the amount of water supplied to the steam tank (153) and the boiler (154) can be controlled through the feed water pumps (P1, P2) from the feedback water tank (158).
- water can be supplied through the circulation pumps (P3, P4).
- the water supplied to the steam tank (153) or separated from the steam can be supplied to the sub-economizer (152) through the first circulation pump (P3).
- the water of the boiler (154) can be supplied to the main economizer (112) through the second circulation pump (P4).
- water is supplied to the steam tank (153) or the boiler (154), thereby maintaining the water level of the steam tank (153) and the boiler (154) constant, thereby stably generating steam.
- the amount of water supplied can be adjusted according to the change in the amount of heat available in the exhaust gas, thereby generating maximum steam.
- it may be configured to supply water directly from the feedback water tank (158) to the sub-economizer (152) or the main economizer (112).
- a water supply valve (V4) may be included to control the amount of water delivered to each steam tank (153) or boiler (154) according to the available heat of the exhaust gas of the auxiliary engine (121).
- the water supply valve (V4) may supply recovered water to the steam tank (153) or boiler (154) according to the available heat of the main economizer (112) and the sub-economizer (152). Since there may be some loss in the steam-water circulation path, a water make-up valve may be included to additionally supply water to the feedback water tank from the outside in order to maintain a stable water level.
- FIG. 6 illustrates a ship carbon dioxide capture system according to a second embodiment of the present invention.
- the ship carbon dioxide capture system comprises: a carbon dioxide capture device (140) for removing carbon dioxide contained in exhaust gas of a main engine (111); a low-temperature steam generation unit (150) for generating steam by heat exchange with exhaust gas of an auxiliary engine (121); a low-temperature steam supply line (155) for supplying steam generated in the low-temperature steam generation unit (150) to the carbon dioxide capture device (140); a main economizer (112) provided on a main engine exhaust line (ML) connecting between a main engine (111) and a carbon dioxide capture device (140) for generating main steam by heat exchange with exhaust gas of the main engine (111); a second low-temperature steam generation unit (160) provided on a main engine exhaust line (ML) at a rear end of the main economizer (112) for generating second steam by heat exchange with main engine exhaust gas passing through the main economizer (112); And it may include a second
- the temperature of the exhaust gas discharged through the exhaust gas discharge pipe (114) is still high, so it can be cooled to the absorption temperature required by the carbon dioxide capture device (140) in the precooler (115) and then supplied to the carbon dioxide capture device (140).
- the carbon dioxide capture system provides a separate second low-temperature steam generation unit (160) at the rear end of the main economizer (112) to further lower the temperature of the exhaust gas supplied to the precooler (115), so that the waste heat of the main engine exhaust gas passing through the main economizer (112) can be utilized once more in the second low-temperature steam generation unit (160). Accordingly, the amount of low-temperature steam produced can be increased, and the temperature of the main engine exhaust gas supplied to the precooler (115) can be lowered. Since the temperature of the main engine exhaust gas flowing into the precooler (115) is lowered, the amount of cooling water (seawater) supplied to the precooler (115) can be reduced, thereby improving system efficiency.
- a separate second low-temperature steam generation unit (160) at the rear end of the main economizer (112) to further lower the temperature of the exhaust gas supplied to the precooler (115), so that the waste heat of the main engine exhaust gas passing through the main economizer (112) can
- the second low-temperature steam generator (160) may be a second economizer, and the low-temperature steam generated in the second low-temperature steam generator (160) may be supplied to the reboiler (142) of the carbon dioxide capture device (140) through the second low-temperature steam supply line (161).
- the second low-temperature steam supply line (161) may be joined to the low-temperature steam supply line (155) or may be supplied individually to the reboiler (142) of the carbon dioxide capture device (140).
- the carbon dioxide capture system according to the second embodiment may further include a third low-temperature steam generation unit (162) that generates third steam by heat exchange with boiler exhaust gas generated from the boiler (154); and a third low-temperature steam supply line (163) that supplies the third steam generated from the third low-temperature steam generation unit (162) to the carbon dioxide capture device (140).
- a separate third low-temperature steam generation unit (162) may be provided to further increase the production amount of low-temperature steam by utilizing waste heat of boiler exhaust gas generated from the boiler (154).
- the third low-temperature steam generation unit (162) may be a third sub-economizer, and the low-temperature steam generated from the third low-temperature steam generation unit (162) may be supplied to the reboiler (142) of the carbon dioxide capture device (140) through the third low-temperature steam supply line (163).
- the third low-temperature steam supply line (163) may be joined to the low-temperature steam supply line (155) or may be individually supplied to the reboiler (142) of the carbon dioxide capture device (140).
- the second embodiment can be applied to a case where the main engine (111) and the auxiliary engine (121) use dual fuel (gas/diesel), but is not limited thereto.
- the second embodiment in addition to the exhaust gas of the auxiliary engine (121), waste heat of the exhaust gas of the main engine (111) and the boiler (154) is used, and low-temperature steam can be generated through each low-temperature steam generating unit and used for absorbent regeneration.
- at least a portion of the exhaust gas of the main engine (111) can be supplied to the carbon dioxide capture device (140).
- FIG. 7 illustrates a ship carbon dioxide capture system according to a third embodiment of the present invention.
- the ship carbon dioxide capture system may include a carbon dioxide capture device (140) for removing carbon dioxide contained in exhaust gas of a main engine (111); a methane oxidation catalytic reactor (180) for removing methane contained in exhaust gas of an auxiliary engine (121); a low-temperature steam generation unit (150) provided at a rear end of the methane oxidation catalytic reactor (180) for generating steam by heat exchange with exhaust gas passing through the methane oxidation catalytic reactor (180); and a low-temperature steam supply line (155) for supplying the steam generated in the low-temperature steam generation unit (150) to the carbon dioxide capture device (140).
- the third embodiment is illustrated in FIG. 7 as adding a methane oxidation catalytic reactor (180) between the auxiliary engine (121) and the low-temperature steam generating unit (150) in the first embodiment, but the methane oxidation catalytic reactor (180) may also be added between the auxiliary engine (121) and the low-temperature steam generating unit (150) in the same manner as in FIG. 6 (the second embodiment).
- waste heat of high-temperature exhaust gas generated while passing through the methane oxidation catalytic reactor (180) may be utilized to generate low-temperature steam in the low-temperature steam generating unit (150).
- the methane oxidation catalyst reactor (180) may be provided on the exhaust gas line of the auxiliary engine (121), and the carbon dioxide capture device (140) may be provided on the exhaust gas line of the main engine (111). Since the methane oxidation catalyst is expensive, it is used only in a low-pressure auxiliary engine (power generation engine) and not in a high-pressure main engine (propulsion engine), thereby reducing the cost of the methane oxidation catalyst.
- the third embodiment can be applied to a case where the main engine (111) and the auxiliary engine (121) use dual fuel (gas/diesel), but is not limited thereto.
- the third embodiment can provide a sufficient heat source for low-temperature steam generation by using waste heat of exhaust gas of the auxiliary engine (121), and by using waste heat of high-temperature exhaust gas that has passed through a methane oxidation catalytic reactor (180).
- at least a portion of the exhaust gas of the main engine (111) can be supplied to a carbon dioxide capture device (140).
- FIG. 8 illustrates a carbon dioxide capture system for a ship according to a fourth embodiment of the present invention.
- the carbon dioxide capture system for a ship may include a carbon dioxide capture device (140) for removing carbon dioxide contained in exhaust gas of a main engine (111); a main economizer (112) for generating main steam by heat exchange with exhaust gas of the main engine (111); a composite low-temperature steam generation unit (170) for generating steam by supplying together the main engine exhaust gas and the exhaust gas of the auxiliary engine (121) that have passed through the main economizer (112); and a low-temperature steam supply line (155) for supplying the steam generated in the composite low-temperature steam generation unit (170) to the carbon dioxide capture device (140).
- a carbon dioxide capture device 140
- main economizer (112) for generating main steam by heat exchange with exhaust gas of the main engine (111)
- a composite low-temperature steam generation unit (170) for generating steam by supplying together the main engine exhaust gas and the exhaust gas of the
- the main engine exhaust gas and the exhaust gas of the auxiliary engine (121) that have passed through the main economizer (112) are supplied together to the composite low-temperature steam generation unit (170) to generate low-temperature steam.
- the composite low-temperature steam generation unit (170) may be a composite sub-economizer.
- the waste heat of the main engine exhaust gas discharged from the main economizer (112) can be utilized once more in the composite low-temperature steam generation unit (170) to generate low-temperature steam together with the exhaust gas of the auxiliary engine (121). Therefore, the amount of low-temperature steam generated can be increased compared to generating low-temperature steam only with the exhaust gas of the auxiliary engine (121).
- At least a portion of the boiler exhaust gas generated in the boiler (154) can be supplied to the composite low-temperature steam generating unit (170). Accordingly, the waste heat of the boiler exhaust gas discharged from the boiler (154) can also be utilized to generate low-temperature steam in the composite low-temperature steam generating unit (170).
- the fourth embodiment can be applied to a case where the main engine (111) and the auxiliary engine (121) use dual fuel (gas/diesel), but is not limited thereto.
- the fourth embodiment in addition to the exhaust gas of the auxiliary engine (121), waste heat of the exhaust gas of the main engine (111) and the boiler (154) can be used to generate low-temperature steam through a single composite low-temperature steam generating unit (170) and to regenerate the absorbent.
- at least a portion of the exhaust gas of the main engine (111) can be supplied to the carbon dioxide capturing device (140).
- FIG. 9 illustrates a carbon dioxide capture system for a ship according to a fifth embodiment of the present invention.
- the carbon dioxide capture system for a ship includes a carbon dioxide capture device (140) for removing carbon dioxide contained in exhaust gas of a main engine (111); a low-temperature steam generation unit (150) for generating steam by heat exchange with exhaust gas of an auxiliary engine (121); and a low-temperature steam supply line (155) for supplying steam generated in the low-temperature steam generation unit (150) to the carbon dioxide capture device (140), wherein at least a portion of the auxiliary engine exhaust gas passing through the low-temperature steam generation unit (150) can be joined to a main engine exhaust line (ML) connecting the main engine (111) and the carbon dioxide capture device (140).
- ML main engine exhaust line
- a main economizer (112) is further included, which is provided in the main engine exhaust line (ML) and generates main steam by heat exchange with the exhaust gas of the main engine, and at least a portion of the auxiliary engine exhaust gas that has passed through the low-temperature steam generating unit (150) can be joined to the main engine exhaust line (ML) at the rear end of the main economizer (112).
- the joining location of the auxiliary engine exhaust gas that has passed through the low-temperature steam generating unit (150) is specified.
- the exhaust gas of the auxiliary engine (121) contains more harmful substances than LNG, it can be combined with the exhaust gas of the main engine (111) to remove carbon dioxide and then discharged.
- the exhaust gas that has passed through the low-temperature steam generation unit (150) has different contents of SOx, etc. depending on the type of fuel, and if it does not satisfy the emission standards, it can be combined with the main engine exhaust line (ML) and supplied to the precooler (115) to be discharged into the atmosphere through the sulfuric acid removal unit or the carbon dioxide removal unit.
- the exhaust gas passing through the low-temperature steam generation unit (150) can be combined with the exhaust gas passing through the main economizer (112) and supplied to the carbon dioxide capture device (140). That is, at least a portion of the auxiliary engine exhaust gas passing through the low-temperature steam generation unit (150) can be combined with the main engine exhaust line (ML) and supplied to the carbon dioxide capture device (140). Therefore, in the case of the fifth embodiment, at least a portion of the carbon dioxide contained in the exhaust gas of not only the main engine (111) but also the auxiliary engine (121) can be removed, thereby satisfying the required carbon dioxide emission standard.
- At least a portion of the boiler exhaust gas generated from the boiler (154) may be joined to the main engine exhaust line (ML) at the rear end of the main economizer (112).
- the boiler (154) can generate steam by burning additional fuel independently of the engine, so that at least a portion of the boiler exhaust gas generated at this time may be joined to the main engine exhaust line (ML) and supplied to the carbon dioxide capture device (140). Therefore, in the case of the fifth embodiment, at least a portion of the carbon dioxide contained in the exhaust gas emitted from the boiler (154) as well as the main engine (111) and the auxiliary engine (121) may be removed, thereby satisfying the required carbon dioxide emission standard.
- the second low-temperature steam generating unit (160) of the second embodiment may be configured to be installed on the main engine exhaust line (ML) at the rear end of the main economizer (112) so as to generate second steam by heat exchange with the main engine exhaust gas passing through the main economizer (112).
- the third low-temperature steam generating unit (162) of the second embodiment may be configured to generate third steam by heat exchange with the boiler exhaust gas generated in the boiler (154).
- the fifth embodiment can be applied to a case where the main engine (111) and the auxiliary engine (121) use liquid fuel, but is not limited thereto.
- the liquid fuel include, but are not limited to, diesel fuel (e.g., heavy fuel oil (HFO), very low sulfur marine fuel oil (VLSFO), marine gas oil (MGO)), methanol, etc.
- low-temperature steam can be generated by utilizing waste heat of the exhaust gas of the auxiliary engine (121) and can be used for absorbent regeneration.
- at least a portion of the exhaust gas of the main engine (111) as well as at least a portion of the exhaust gas of the auxiliary engine (121) and the boiler (154) can be supplied to the carbon dioxide capture device (140).
- FIG. 10 illustrates a carbon dioxide capture system for a ship according to a sixth embodiment of the present invention.
- the carbon dioxide capture system for a ship includes: a carbon dioxide capture device (140) for removing carbon dioxide contained in exhaust gas of a main engine (111); a low-temperature steam generation unit (150) for generating steam by heat exchange with exhaust gas of an auxiliary engine (121); a low-temperature steam supply line (155) for supplying steam generated in the low-temperature steam generation unit (150) to the carbon dioxide capture device (140); a main economizer (112) provided on a main engine exhaust line (ML) connecting the main engine (111) and the carbon dioxide capture device (140) for generating main steam by heat exchange with exhaust gas of the main engine (111);
- a branch line (BL) is included, which branches from the main engine exhaust line (ML) at the rear end of the main economizer (112) and is connected to an exhaust line (SL) connecting the auxiliary engine (121) and the low-temperature steam generation unit (150), and at
- the temperature of the exhaust gas discharged through the exhaust gas discharge pipe (114) is still high, so it can be cooled to the absorption temperature required by the carbon dioxide capture device (140) in the precooler (115) and then supplied to the carbon dioxide capture device (140).
- the carbon dioxide capture system may include a branch line (BL) that supplies at least a portion of the exhaust gas passing through the main economizer (112) to the low-temperature steam generation unit (150) to further lower the temperature of the exhaust gas supplied to the precooler (115). That is, by reusing the waste heat of the exhaust gas discharged from the main economizer (112) in the low-temperature steam generation unit (150), the production amount of low-temperature steam in the low-temperature steam generation unit (150) can be increased, and the temperature of the exhaust gas supplied to the carbon dioxide capture device (140) can be lowered.
- BL branch line
- the exhaust gas discharged from the main economizer (112) can be selectively supplied to the low-temperature steam generation unit (150) or directly supplied to the precooler (115).
- At least a portion of the boiler exhaust gas generated in the boiler (154) may be joined to the auxiliary engine exhaust line (SL) and supplied to the low-temperature steam generation unit (150). Accordingly, the waste heat of the boiler exhaust gas generated in the boiler (154) may also be utilized to generate low-temperature steam in the low-temperature steam generation unit (150).
- the integrated exhaust gas passing through the low-temperature steam generator (150) may be joined to the main engine exhaust line (ML) at the rear end of the main economizer (112).
- the integrated exhaust gas may be a mixture of the main engine exhaust gas of the main engine (111), the auxiliary engine exhaust gas of the auxiliary engine (121), and the boiler exhaust gas of the boiler (154).
- At least a portion of the integrated exhaust gas may be supplied to the carbon dioxide capture device (140) to satisfy the required carbon dioxide emission standard.
- the sixth embodiment can be applied when the main engine (111) and the auxiliary engine (121) use liquid fuel, but is not limited thereto.
- the liquid fuel include, but are not limited to, diesel fuel (e.g., heavy fuel oil (HFO), very low sulfur marine fuel oil (VLSFO), marine gas oil (MGO)), methanol, etc.
- waste heat of the exhaust gas of the main engine (111) and the boiler (154) can be used to generate low-temperature steam to be used for absorbent regeneration.
- not only at least a portion of the exhaust gas of the main engine (111) but also at least a portion of the exhaust gas of the auxiliary engine (121) and the boiler (154) can be supplied to the carbon dioxide capture device (140).
- the first to fourth embodiments differ in that they are embodiments when using dual fuel, and the fifth and sixth embodiments are embodiments when using liquid fuel (examples of the liquid fuel include, but are not limited to, diesel fuel (e.g., heavy fuel oil (HFO), very low sulfur marine fuel oil (VLSFO), marine gas oil (MGO)), methanol, etc.), but they have in common that the exhaust gas of the auxiliary engine (121) is used as the basic heat source for generating low-temperature steam, and the carbon dioxide capture device (140) is arranged in the exhaust gas line of the main engine (111).
- the configurations of each embodiment are not exclusively applicable, and may be configured in combination, respectively.
- FIG. 11 is one of the optimal embodiments of the present invention, and based on FIG. 7 of the third embodiment, an SCR (selective catalytic reduction) device (190) may be added between the main engine (111) and the main economizer (112), and an SCR (190) or pre-heating (200) may be added between the auxiliary engine (121) and the methane oxidation catalytic reactor (180).
- the SCR (190) may be installed at the rear end of the methane oxidation catalytic reactor (180) or may be installed in parallel.
- a damper (210) may be provided at the point where the exhaust gas of the main engine (111) is diverted to the carbon dioxide capture device (140). This embodiment may be applied to a case where the main engine (111) and the auxiliary engine (121) use dual fuel (gas/diesel), but is not limited thereto.
- FIG. 12 is another embodiment of the best embodiment of the present invention, and based on FIG. 9 of the fifth embodiment, an SCR (190) may be added between the main engine (111) and the main economizer (112), and an SCR (190) may be added between the auxiliary engine (121) and the low-temperature steam generator (150).
- a damper (210) may be provided at the point where the exhaust gas of the main engine (111) is diverted to the carbon dioxide capture device (140). This embodiment may be applied when the main engine (111) and the auxiliary engine (121) use liquid fuel, but is not limited thereto.
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Abstract
Description
Claims (15)
- 주 엔진의 배기가스에 포함된 이산화탄소를 제거하는 이산화탄소 포집장치;보조 엔진의 배기가스와 열교환하여 스팀을 생성하는 저온 스팀 생성부; 및상기 저온 스팀 생성부에서 생성된 상기 스팀을 상기 이산화탄소 포집장치에 공급하는 저온 스팀 공급라인을 포함하는 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 보조 엔진과 상기 저온 스팀 생성부 사이에 마련되어, 상기 보조 엔진의 배기가스에 포함된 메탄을 제거하는 메탄 산화 촉매 반응기를 더 포함하고,상기 저온 스팀 생성부는, 상기 메탄 산화 촉매 반응기를 통과한 배기가스와 열교환하여 스팀을 생성하는 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 저온 스팀 공급라인에는 상기 스팀 내의 액상의 물을 분리하는 스팀탱크가 마련되어 있는 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 저온 스팀 생성부는 서브 이코노마이저이고,상기 스팀은 6barg 미만의 압력조건 하에서 100℃ 이상 165℃ 미만의 온도조건을 가지는 저온 스팀인 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 저온 스팀 공급라인 상에 마련되어, 상기 이산화탄소 포집장치로 공급되는 스팀의 양을 조절하는 제1 스팀밸브를 포함하는 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 주 엔진의 배기가스와 열교환하여 메인 스팀을 생성하는 메인 이코노마이저;상기 메인 이코노마이저에서 예열된 메인 스팀을 공급받아 고온의 보일러 스팀을 생성하는 보일러; 및상기 보일러에서 생성된 고온의 보일러 스팀을 상기 이산화탄소 포집장치로 공급하는 추가 공급라인 상에 마련되어, 상기 고온의 보일러 스팀을 저온 스팀으로 전환하는 제2 스팀밸브를 포함하는 선박용 이산화탄소 포집 시스템.
- 청구항 1에 있어서,상기 주 엔진과 상기 이산화탄소 포집장치 사이를 연결하는 주 엔진 배기라인 상에 마련되어, 상기 주 엔진의 배기가스와 열교환하여 메인 스팀을 생성하는 메인 이코노마이저;상기 메인 이코노마이저의 후단의 상기 주 엔진 배기라인 상에 마련되어, 상기 메인 이코노마이저를 통과한 주 엔진 배기가스와 열교환하여 제2 스팀을 생성하는 제2 저온 스팀 생성부; 및상기 제2 저온 스팀 생성부에서 생성된 상기 제2 스팀을 상기 이산화탄소 포집장치에 공급하는 제2 저온 스팀 공급라인을 더 포함하는 선박용 이산화탄소 포집 시스템.
- 청구항 1 내지 청구항 7에 있어서,상기 주 엔진 또는 상기 보조 엔진은 이중 연료를 사용하는 선박용 이산화탄소 포집 시스템.
- 주 엔진의 배기가스에 포함된 이산화탄소를 제거하는 이산화탄소 포집장치;상기 주 엔진의 배기가스와 열교환하여 메인 스팀을 생성하는 메인 이코노마이저;상기 메인 이코노마이저를 통과한 주 엔진 배기가스 및 보조 엔진의 배기가스가 함께 공급되어 스팀을 생성하는 복합 저온 스팀 생성부; 및상기 복합 저온 스팀 생성부에서 생성된 상기 스팀을 상기 이산화탄소 포집장치에 공급하는 저온 스팀 공급라인을 포함하는 선박용 이산화탄소 포집 시스템.
- 청구항 9에 있어서,상기 메인 이코노마이저에서 예열된 메인 스팀을 공급받아 고온의 보일러 스팀을 생성하는 보일러를 더 포함하고,상기 보일러에서 생성된 보일러 배기가스의 적어도 일부가 상기 복합 저온 스팀 생성부로 공급되는 선박용 이산화탄소 포집 시스템.
- 주 엔진의 배기가스에 포함된 이산화탄소를 제거하는 이산화탄소 포집장치;보조 엔진의 배기가스와 열교환하여 스팀을 생성하는 저온 스팀 생성부; 및상기 저온 스팀 생성부에서 생성된 상기 스팀을 상기 이산화탄소 포집장치에 공급하는 저온 스팀 공급라인을 포함하고,상기 저온 스팀 생성부를 통과한 보조 엔진 배기가스의 적어도 일부가, 상기 주 엔진과 상기 이산화탄소 포집장치 사이를 연결하는 주 엔진 배기라인에 합류되는 선박용 이산화탄소 포집 시스템.
- 청구항 11에 있어서,상기 주 엔진 배기라인에 마련되어, 상기 주 엔진의 배기가스와 열교환하여 메인 스팀을 생성하는 메인 이코노마이저를 더 포함하고,상기 저온 스팀 생성부를 통과한 보조 엔진 배기가스의 적어도 일부는 상기 메인 이코노마이저의 후단의 상기 주 엔진 배기라인에 합류되는 선박용 이산화탄소 포집 시스템.
- 청구항 12에 있어서,상기 메인 이코노마이저에서 예열된 메인 스팀을 공급받아 고온의 보일러 스팀을 생성하는 보일러를 더 포함하고,상기 보일러에서 생성된 보일러 배기가스의 적어도 일부가 상기 메인 이코노마이저의 후단의 상기 주 엔진 배기라인에 합류되는 선박용 이산화탄소 포집 시스템.
- 청구항 11에 있어서,상기 주 엔진 배기라인 상에 마련되어, 상기 주 엔진의 배기가스와 열교환하여 메인 스팀을 생성하는 메인 이코노마이저;상기 메인 이코노마이저의 후단의 상기 주 엔진 배기라인에서 분기되어, 상기 보조 엔진과 상기 저온 스팀 생성부 사이를 연결하는 보조 엔진 배기라인에 연결되는 분기라인을 포함하고,상기 메인 이코노마이저를 통과한 주 엔진 배기가스의 적어도 일부가 상기 분기라인을 통해 상기 저온 스팀 생성부로 공급되는 선박용 이산화탄소 포집 시스템.
- 청구항 11 내지 청구항 14에 있어서,상기 주 엔진 또는 상기 보조 엔진은 액체 연료를 사용하는 선박용 이산화탄소 포집 시스템.
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| JP2025552055A JP2026510766A (ja) | 2023-03-08 | 2024-03-08 | 船舶用二酸化炭素捕集システム |
| CN202480017301.7A CN120835952A (zh) | 2023-03-08 | 2024-03-08 | 用于船舶的二氧化碳捕集系统 |
| EP24767459.1A EP4678881A1 (en) | 2023-03-08 | 2024-03-08 | Carbon dioxide capture system for ship |
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| KR20230030726 | 2023-03-08 | ||
| KR10-2023-0030726 | 2023-03-08 | ||
| KR1020230093363A KR20240137444A (ko) | 2023-03-08 | 2023-07-18 | 보조엔진의 배기가스 폐열 이용한 이산화탄소 흡수제 재생장치 및 재생방법 |
| KR10-2023-0093363 | 2023-07-18 | ||
| KR10-2024-0032863 | 2024-03-07 | ||
| KR1020240032863A KR20240137495A (ko) | 2023-03-08 | 2024-03-07 | 선박용 이산화탄소 포집 시스템 |
| KR10-2024-0032864 | 2024-03-07 | ||
| KR1020240032864A KR20240137496A (ko) | 2023-03-08 | 2024-03-07 | 선박용 이산화탄소 포집 시스템 |
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| EP (1) | EP4678881A1 (ko) |
| JP (1) | JP2026510766A (ko) |
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| WO (1) | WO2024186172A1 (ko) |
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| KR20230030726A (ko) | 2021-08-26 | 2023-03-07 | 홍익대학교 산학협력단 | 저지대 주차 차량의 침수 경보 예약 서비스 방법 |
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| KR20240032864A (ko) | 2021-06-23 | 2024-03-12 | 락팁스 | 셀룰로오스 물질층과 적어도 하나의 카세인 및/또는 적어도 하나의 카세인염을 포함하는 물질층으로 구성된, 포장재로 사용될 수 있는 다층 재료 |
| KR20240032863A (ko) | 2021-07-30 | 2024-03-12 | 에이지씨 가부시키가이샤 | 반도체 제조 장치용의 부재 및 그러한 부재를 제조하는 방법 |
-
2024
- 2024-03-08 EP EP24767459.1A patent/EP4678881A1/en active Pending
- 2024-03-08 WO PCT/KR2024/003043 patent/WO2024186172A1/ko not_active Ceased
- 2024-03-08 CN CN202480017301.7A patent/CN120835952A/zh active Pending
- 2024-03-08 JP JP2025552055A patent/JP2026510766A/ja active Pending
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| KR20240032864A (ko) | 2021-06-23 | 2024-03-12 | 락팁스 | 셀룰로오스 물질층과 적어도 하나의 카세인 및/또는 적어도 하나의 카세인염을 포함하는 물질층으로 구성된, 포장재로 사용될 수 있는 다층 재료 |
| KR20240032863A (ko) | 2021-07-30 | 2024-03-12 | 에이지씨 가부시키가이샤 | 반도체 제조 장치용의 부재 및 그러한 부재를 제조하는 방법 |
| KR20230030726A (ko) | 2021-08-26 | 2023-03-07 | 홍익대학교 산학협력단 | 저지대 주차 차량의 침수 경보 예약 서비스 방법 |
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Also Published As
| Publication number | Publication date |
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| JP2026510766A (ja) | 2026-04-10 |
| CN120835952A (zh) | 2025-10-24 |
| EP4678881A1 (en) | 2026-01-14 |
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