CN102000681A - Thermal decomposition adhesive material removing method and thermal decomposition gasification system - Google Patents
Thermal decomposition adhesive material removing method and thermal decomposition gasification system Download PDFInfo
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- CN102000681A CN102000681A CN2010102490365A CN201010249036A CN102000681A CN 102000681 A CN102000681 A CN 102000681A CN 2010102490365 A CN2010102490365 A CN 2010102490365A CN 201010249036 A CN201010249036 A CN 201010249036A CN 102000681 A CN102000681 A CN 102000681A
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- 238000002309 gasification Methods 0.000 title claims abstract description 49
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000001301 oxygen Substances 0.000 claims abstract description 55
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 55
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- 239000010802 sludge Substances 0.000 claims abstract description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 42
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- 229910052742 iron Inorganic materials 0.000 claims description 21
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Abstract
The invention provides a method capable of effectively removing thermal decomposition products on an inner wall of a pipe in a biomass thermal decomposition gasification system and a thermal decomposition gasification system. The thermal decomposition adhesive removing method is that: in the thermal decomposition gasification system (10) of the biomass such as an underwater sludge and a woody biomass, the mixed gas of below 13 volume% of an inactive gas and above 5 volume% of oxygen is arranged in the pipe (12) between a thermal decomposition gasification furnace (11) and a combustion furnace (13) to circulate and the thermal decomposition adhesive material on the inner wall of the pipe at the gas temperature of above 500DEG C burns to be removed.
Description
Technical field
The present invention relates in the thermal decomposition gasification system of the living beings of downflow sludge, Wooden Biomass etc., to remove method attached to the thermal decomposition product on the pipe arrangement inside etc.
Background technology
Decompose in the gasification system 10 at the illustrative biomass thermal of Fig. 1, in thermal decomposition gasification furnace 11, under the atmosphere of 300～600 ℃ of temperature, blocking-up oxygen, biomass thermal is decomposed.The thermal decomposition gas that produces in thermal decomposition gasification furnace 11 is transported to combustion furnace 13 via pipe arrangement 12, in combustion furnace 13 internal combustion.
When making above-mentioned biomass thermal decompose the gasification system running, at the pipe arrangement inwall and be arranged on the impeller etc. of pipe arrangement air blast 14 midway heat of condensation decomposition gas and adhere to or pile up the dust part.After the amount increase of attachment and deposit (to call attachment in the following text),, increase and continuous operational failures such as vibration increase so produce the output of air blast because of pipe arrangement obturation and the deterioration of impeller balance.Therefore, the thermal decomposition gasification system is stopped, attachment is also removed in cleaning pipe arrangement inside.
In oil-refinery industry and petro chemical industry etc., known have a kind of thermal decomposition attachment removal method that is called decoking.Decoking is a kind of method as described below: the steam of high temperature and inactive gas are circulated in pipe arrangement, and the attachment thermal shock of giving the pipe arrangement inwall, make attachment produce spallation (shrinking fracture) thus and come off from pipe arrangement, the attachment that come off is discharged by fluid (gas), and utilize the gas of sneaking into little air to make residual attachment burning and decompose.
In patent documentation 1, record in the combustion decomposition more than 600 ℃ because of can't avoiding the deterioration of tubing matter, and need strict running management.Record the attachment amount in addition when implementing spallation for a long time, the coke of peeling off stops up the problem of pipe.In order to prevent the generation of these situations, in patent documentation 1 disclosed technology be with because of attached to the coke of the generation of the former wet goods in the pipe under the mixed atmosphere of air and steam or inactive gas, under the condition of 350 ℃～500 ℃ of temperature, oxygen concentration 3 volume %～21 volume %, implement decoking.
Patent documentation 1: Japan's special permission No. 2973347 communique (right item 1, paragraph [0013]～[0018], [0020])
In biomass thermal decomposes gasification system, though think that spallation that gas causes has to a certain degree effect to the removal of decomposing attachment at the formed more soft biomass thermal of skin section, need keep the velocity in pipes and the pressure of gas higher.It is unsatisfactory that this decomposes in the biomass energy conversion equipment of gasification system etc. the viewpoint that reduces from most important life cycle cost at biomass thermal.In addition, to compare attachment more with petroleum in biomass material, therefore, when at high temperature making biomass thermal decompose the attachment combustion decomposition, easily produces local heating and burning out of control.
In addition, at the thermal decomposition attachment (coke) that derives from oil with derive from the thermal decomposition attachment of living beings, because of composition different fully, so the proterties of attachment and thermal decomposition mechanism difference.In patent documentation 1,, implementing combustion decomposition below 500 ℃ for peeling off that the thermal denaturation sclerosis that prevents to result from coke is shunk.But, under the condition of patent documentation 1, even carry out the removal that biomass thermal decomposes the thermal decomposition attachment of gasification system, because therefore the attachment poor removal effect also can produce the problem that needs long-time this class when removing.That is, under the condition of patent documentation 1, removing biomass thermal decomposition attachment needs long-time arrestment, poor practicability.
Summary of the invention
The invention provides a kind ofly in the thermal decomposition gasification system of living beings, can remove method and thermal decomposition gasification system effectively attached to the thermal decomposition product on pipe arrangement inwall etc.
In order to address the above problem, the invention provides a kind of thermal decomposition attachment removal method, in the thermal decomposition gasification system of living beings such as downflow sludge, Wooden Biomass, making oxygen concentration is that 5 volume % mist above and inactive gas below the 13 volume % and oxygen circulates to the pipe arrangement that is arranged between thermal decomposition gasification furnace and the combustion furnace, under gas temperature is condition more than 500 ℃, makes attached to the burning of the thermal decomposition attachment on the inwall of described pipe arrangement and remove.
In addition, this aspect provides a kind of thermal decomposition gasification system, is the thermal decomposition gasification system of living beings such as downflow sludge, Wooden Biomass, wherein, possesses: the thermal decomposition gasification furnace; Be arranged on the combustion furnace in this thermal decomposition gasification furnace downstream; Be arranged on the pipe arrangement between described thermal decomposition gasification furnace and the described combustion furnace, also possess: the oxidant supply port, be connected with described pipe arrangement, be used for to the oxidant of described pipe arrangement supply as the mist of inactive gas and oxygen; The oxidant adjustment part is used for oxygen concentration with described oxidant and is adjusted into more than the 5 volume % below the 13 volume %; Be used for the heating part that the inwall to described pipe arrangement heats; To carry out the gas temperature test section of instrumentation in the temperature of the gas of the inboard of described pipe arrangement circulation; And be used to control the gas temperature control part of described gas temperature.
For decomposing the pipe arrangement of gasification system attached to biomass thermal and being arranged on attachment on the pipe arrangement air blast midway, are main bodys at 300～600 ℃ of vaporized compositions.When thermal decomposition gas arrives pipe arrangement and air blast because lower with respect to the temperature of gas temperature pipe arrangement inwall during the equipment starting, so gas componant is condensed attached on the pipe arrangement inwall.During the accumulation horizon thickening of thermal decomposition attachment, accumulation horizon becomes thermal insulation layer, so along with the growth of attachment, the higher boiling composition is mainly piled up.That is, the face side of accumulation horizon mainly is the higher boiling composition.In the present invention, be condition more than 500 ℃ by forming gas temperature, combustion decomposition is removed the higher boiling composition of accumulation horizon face side effectively, so promote the decomposition reaction to accumulation horizon lower floor.Decompose in the situation of attachment at biomass thermal, the thermal denaturation sclerosis that is not created in the said temperature scope is shunk, and does not have attachment to peel off the also danger of inaccessible pipe arrangement in a large number.
When implementing combustion decomposition more than oxygen concentration is 5 volume % and under the mixed-gas atmosphere of inactive gas below the 13 volume % and oxygen, make the oxidation of thermal decomposition attachment, promote from the phase change of solid to gas by partial combustion.In addition, in the present invention, can use the inexpensive devices as membrane separation device in above-mentioned oxygen concentration scope, to adjust, can reduce life cycle cost.When oxygen concentration was also lower than 5 volume %, reactivity reduced sharp.On the other hand, when oxygen concentration surpasses 13 volume %, cause burning out of control, reaction control becomes difficult.
In thermal decomposition attachment removal method of the present invention, can be to hang down combustion decomposition under the flow velocity about 1m/s at the superficial linear velocity in a column of pipe arrangement, therefore suppress the quantity delivered of mist.Therefore, can reduce life cycle cost.
In thermal decomposition gasification system of the present invention, the mixing portion that described oxidant adjustment part possesses the pipeline that is used to be collected in the waste gas of circulation in the described pipe arrangement and this waste gas of collecting and air are mixed, therefore can be reduced in the power that needs in the oxidant manufacturing, so preferred.
In foregoing invention, be to remove described decomposition attachment under the condition below 650 ℃ preferably at described gas temperature.In addition, preferably under being condition below 600 ℃, the iron sheet temperature of described pipe arrangement removes described thermal decomposition attachment.
Make thermal decomposition attachment combustion decomposition as long as satisfy the mode of said temperature scope with the iron sheet temperature (temperature of pipe arrangement outer surface) of gas temperature or pipe arrangement, then can prevent the damage and the deterioration of pipe arrangement.
In foregoing invention, preferably in described pipe arrangement, supply with the described mist of normal temperature.
In the present invention, there is no need in advance the mist of supplying with to be heated to above-mentioned reaction temperature.Reaction heat when the mist utilization of being supplied with is burnt heats up.Therefore, can suppression equipment the use amount of fossil fuel during running, and there is no need mist and supply with the oxymeter of system and be set to high temperature resistant mode and anti-waste gas mode.Its result can reduce life cycle cost.
In foregoing invention, preferably in the pipe arrangement that is arranged on described pipe arrangement upstream side midway, supply with described mist.
When the pipe arrangement upstream portion is supplied with mist as oxidant, be deposited in attachment on the impeller etc. of pipe arrangement inwall and air blast from upstream side combustion decomposition successively.Measure the gas temperature and the pipe arrangement temperature in pipe arrangement downstream, if temperature is below the setting, the combustion decomposition that then can judge pipe arrangement inside finishes.That is,,, also can hold the combustion decomposition situation according to gas temperature and reaction temperature even oxymeter is not set in pipe arrangement inside according to the present invention.
In foregoing invention, preferably, at a place of described pipe arrangement or the gas temperature in the described pipe arrangement of many places instrumentation, this instrumentation to gas temperature at least one value when surpassing 650 ℃, make the oxygen concentration of the described mist that in described pipe arrangement, circulates be reduced to less than 5 volume %.
As mentioned above, when reaction temperature uprised, the possibility that the material of pipe arrangement sustains damage improved.Therefore, when the gas temperature in the pipe arrangement of a place or many places instrumentation surpasses 650 ℃,, then suppress the combustion decomposition reaction, reduce gas temperature, utilize gas to make the pipe arrangement cooling if make the oxygen concentration less than 5 volume % of mist.According to the present invention, can easily control the combustion decomposition reaction, and can prevent the damage of pipe arrangement.
In foregoing invention, preferably spray the compressed air of normal temperature to the inwall of the sloping portion of described pipe arrangement.In addition, preferred thermal decomposition gasification system of the present invention also possesses the inwall that is used for to described pipe arrangement and sprays compressed-air actuated nozzle.
For example, the contracted flow portion of pipe arrangement and relative vertical direction tilts or the inwall of the rake of pipe arrangements such as horizontally disposed pipe arrangement on, thermal decomposition gas easily concentrates on a side and adheres to, the part is formed with the accumulation horizon of thick thermal decomposition attachment.When accumulation horizon was thicker, the decoking required time was elongated.In addition, pile up the ash content that generates because of burning at the downside inwall that the pipe arrangement rake grades, therefore, the reactivity of thermal decomposition attachment and oxygen descends.
When the part of the accumulation horizon that is formed with thick attachment is sprayed normal temperature compressed air, crack at accumulation horizon because of spraying the impact that produces.In addition, the ash content after the burning disperses towards the downstream.Thus, the contact-making surface of thermal decomposition attachment and oxygen increases, so reactivity improves.To pipe arrangement inwall compressed-air actuated be injected in deposit is more, be effective especially in the thermal decomposition gasification system of raw material with living beings.In addition, because of utilizing the compressed air of normal temperature in the present invention, so with the steam spallation of common importing relatively, can reduce life cycle cost significantly.
In described invention, preferred described thermal decomposition attachment burning and the waste gas that produces mixes with auxiliary fuel in described combustion furnace, and carry out oxidation processes more than 700 ℃ in temperature.
In the combustion decomposition of described thermal decomposition attachment, the waste gas that contains CO is discharged from.In being arranged at the combustion furnace of back segment, waste gas is mixed with auxiliary fuel, under the temperature conditions more than 700 ℃, carry out oxidation processes, can be used as CO thus
2Emit.
If use thermal decomposition attachment removal method of the present invention, then can remove the thermal decomposition attachment that derives from living beings at short notice safely.In addition, can reduce the life cycle cost of thermal decomposition gasification system.
Description of drawings
Fig. 1 is the skeleton diagram that biomass thermal decomposes gasification system;
Fig. 2 is that the biomass thermal of presentation graphs 1 decomposes the skeleton diagram of the part of gasification system;
Fig. 3 is the curve map of the attachment mass change of expression when making biomass thermal decompose the attachment burning;
Fig. 4 is illustrated in the curve map that the timeliness of the gas temperature of each position in the decoking and iron sheet temperature changes;
Fig. 5 is the part sectioned view of pipe arrangement rake.
The specific embodiment
Below, describe thermal decomposition attachment removal method of the present invention in detail.
Decompose in the gasification system at biomass thermal shown in Figure 1, when the output of air blast 14 surpasses a reference value or after making biomass thermal decompose during the gasification system running necessarily, stop the thermal decomposition gasification furnace.Then, be implemented in the upward combustion decomposition removals (decoking) of the thermal decomposition attachment of accumulation such as impeller of pipe arrangement inwall and air blast.
Fig. 2 is the pipe arrangement skeleton diagram partly of the biomass gasification system of presentation graphs 1.In the thermal decomposition attachment removal method of present embodiment, oxidant is from least one importing of pipe arrangement.For example, oxidant supply port L (the upstream side pipe arrangement of air blast 14), oxidant supply port M (pipe arrangement of thermal decomposition gasification furnace outlet 15), the oxidant supply port N (connecting portion of sloping portion of pipe arrangement (pipe arrangement rake) 16 and the pipe arrangement that is connected with combustion furnace 13) from Fig. 2 supplies with oxidant.When the oxidant supply port L of the upstream side (thermal decomposition gasification furnace side) that is arranged on air blast 14 or oxidant supply port M supply with oxidant, can remove effectively, so preferred attached to the attachment on the impeller of air blast.In Fig. 2, be provided with an oxidant supply port L, but also a plurality of oxidant supply port L can be set between thermal decomposition gasification furnace 13 and air blast 14.
In the present embodiment, oxidant is the mist of oxygen and nitrogen.Oxygen concentration in the oxidant is made as more than the 5 volume % and below the 13 volume %.When oxygen concentration was lower than 5 volume %, reactivity sharply descended.On the other hand, when oxygen concentration surpasses 13 volume %, cause burning out of control, reaction control becomes difficult.
Oxygen concentration in the oxidant is adjusted based on the low oxygen concentration gas of the nitrogen of oxygen concentration less than 5 volume % and the mixing ratio between the compressed air by change.Low oxygen concentration gas can using gases membrane separation device and potential device (PSA) manufacturing.For example, be provided with low oxygen concentration gas storage jar and compressed air cylinder, low oxygen concentration gas and compressed air after the ratio mixing with hope, are supplied with in pipe arrangement from the oxidant supply port.
The oxidant of supplying with in pipe arrangement is preferably normal temperature.So-called normal temperature is meant the identical temperature of temperature (extraneous gas temperature) with the place that is provided with compressed air cylinder and low oxygen concentration gas storage jar, for example is about 25 ℃.
Above-mentioned low oxygen concentration gas can be waste gas circulation in pipe arrangement 12, that comprise the CO that is produced by combustion decomposition.Under this situation, linking on pipe arrangement 12 has pipeline.The part of waste gas is discharged and is collected to the pipe arrangement outside by this pipeline.The pipeline that the other end and air the circulated binding of the pipeline that links with pipe arrangement 12.Be provided with flow control valve at linking part, regulate the exhausted air quantity of supplying with to the pipeline of circulation of air.By being made as this structure, collected waste gas and air are mixed in above-mentioned oxygen concentration scope.Mixed waste gas and air are supplied with to pipe arrangement 12 from oxidant supply port L, M, N as oxidant.
By being made as this structure, do not need to be used to generate compressed-air actuated air compressor, can reduce oxidant and make needed power.
The oxidant (mist) of the normal temperature of supplying with from the oxidant supply port circulates in pipe arrangement 12 with the superficial linear velocity in a column about 1m/s.By heater heating pipe arrangement 12, thereby the thermal decomposition attachment is heated.When the thermal decomposition attachment is heated to more than 400 ℃, catches fire and begin decoking.Thermal decomposition attachment partial combustion and after decomposing, gas temperature rises.Gas temperature when the combustion decomposition of present embodiment is reacted is more than 500 ℃.By implementing decoking more than 500 ℃, gasification of higher boiling composition and the oxygen reaction in the oxidant that mainly comprises in the face side of attachment accumulation horizon and promote the combustion decomposition reaction.After the higher boiling composition is decomposed and removes, carry out combustion decomposition reaction to the accumulation horizon lower layer side.Comprising the waste gas of the CO that is produced by combustion decomposition and ash content and mist is carried to pipe arrangement 12 downstreams together.
When the pyrolysis temperature was too high, the pipe arrangement of austenite stainless steel system produced damage and deterioration.For damage and the deterioration that prevents pipe arrangement, under being condition below 600 ℃, the iron sheet temperature of pipe arrangement implements decoking.Perhaps, owing between gas temperature and iron sheet temperature, have dependency relation, so also can set the higher limit of decoking temperature according to gas temperature.Because gas temperature is also higher than iron sheet temperature, so the higher limit of gas temperature is set at higher limit height than iron sheet temperature.In the present embodiment, the gas temperature during decoking is made as below 650 ℃.Come gas temperature is carried out instrumentation to the inner thermometer that inserts of pipe arrangement.Consider the accumulating amount of attachment and suitably be set in the insertion position of pipe arrangement section.For example, for the pipe arrangement of Φ 300mm, to carrying out instrumentation from the gas temperature of pipe arrangement inwall to the position of center 100mm.
Oxygen concentration in the oxidant is high more, and the reactivity of thermal decomposition attachment and oxygen is high more.After in above-mentioned oxygen concentration scope, supplying with the oxidant of the hyperoxia concentration of comparing when decoking begins, has the possibility that sharply rises because of the gas temperature that catches fire.Therefore, also the oxygen in the oxidant of being supplied with can be set at low concentration when decoking begins, monitor the iron sheet temperature of gas temperature and pipe arrangement, and interim oxygen concentration be risen.Like this, control is reacted and can be prevented the generation that rapid temperature rises.
For example, hyperoxia concentration is maintained oxygen concentration more than 12% and when carrying out decoking, thermal decomposition attachment and oxygen reactive good is so often gas temperature surpasses 650 ℃ because of reaction heat.In the present embodiment, also can surpass under 650 ℃ the situation at the gas temperature by the thermometer instrumentation, blocking-up makes the oxygen concentration in the oxidant reduce to less than 5 volume % as the compressed-air actuated supply of oxidant thus.As mentioned above, during oxygen concentration less than 5 volume %, the combustion reaction rate that biomass thermal decomposes attachment sharply reduces.Therefore, the generation of inhibitory reaction heat is decomposed attachment by oxidant (mist) heat of cooling, and therefore, the gas temperature of institute's instrumentation and heter temperature reduce.During being reduced, oxygen concentration also can decide according to the reduction amplitude of gas temperature.Perhaps, also can set in advance and control according to the mode of blocking compressed-air actuated supply with the stipulated time.At the many places of pipe arrangement instrumentation gas temperature, the gas temperature at least one place surpasses when oxygen concentration is reduced, and the control accuracy of combustion decomposition reaction improves, and can further prevent the damage and the deterioration of pipe arrangement reliably.
Decoking is carried out towards the downstream from the upstream side of pipe arrangement.This is that oxygen is difficult to arrive the downstream of reaction generation place because of the oxygen in the position consumption oxidant that produces in the combustion decomposition reaction.Fully burn at attachment and to remove and the position of decoking after finishing, do not react thermogenetic effect, normal temperature oxidation agent circulation is so the gas temperature of institute's instrumentation reduces.At this moment, continue decoking in the downstream, so gas temperature maintains high temperature.Therefore, change, can carry out the judgement that decoking finishes by the timeliness of measuring gas temperature.In addition, monitor gas temperature, can hold decoking and carry out situation by a plurality of positions at pipe arrangement.As mentioned above, related because of between gas temperature and iron sheet temperature, existing, so, also can hold the situation of carrying out of decoking, can judge that decoking finishes by monitoring the iron sheet temperature of pipe arrangement.
Fig. 3 represents as 400 ℃ of atmosphere temperatures, 600 ℃, and 800 ℃ of these three conditions, supplies with the oxidant of 400 ℃ of oxygen concentrations 11%, temperature, the attachment mass change when making biomass thermal decompose the attachment burning.In the figure, transverse axis is the reaction time, and the longitudinal axis is the ratio with respect to the residual attachment quality of initial attachment quality (20g).
Compare for 400 ℃ with temperature,, therefore we can say reactive the raising because of bigger in 600 ℃ of temperature and 800 ℃ of quality reductions.The reactivity of 600 ℃ of temperature and 800 ℃ is roughly equal.The result of Fig. 3 represents that then the decoking about 600 ℃ of temperature is favourable if consider reactive and pipe arrangement material.
Fig. 4 is result's a example of implementing the thermal decomposition attachment method of removaling of present embodiment, be expression air blast surface temperature (iron sheet temperature), and decoking in the gas temperature of diverse location of pipe arrangement and the curve map of the timeliness variation of iron sheet temperature.In the figure, transverse axis is the elapsed time, and the longitudinal axis is the oxygen concentration in the gas temperature of each instrumentation position or iron sheet temperature and oxidant.At air blast 14 inlets and the combustion furnace 13 inlet instrumentation gas temperatures of Fig. 2, in air blast 14, rake a (16a) and rake b (16b) instrumentation iron sheet temperature.
According to Fig. 4, at the decoking initial stage, the iron sheet temperature of the gas temperature at blower inlet place, air blast and rake a surpasses 500 ℃, so can judge in this part generation decoking.On the other hand, the gas temperature that is in the iron sheet temperature of rake b in rake a downstream and combustion furnace inlet postpones than air blast and rake a and above 500 ℃.In addition, near through 16 hours, rise in the iron sheet temperature of rake b and the gas temperature of combustion furnace inlet, relative with it, in the iron sheet temperature decline of blower inlet gas temperature, air blast and rake a.This is illustrated in the upstream side decoking and roughly finishes, but continues decoking in the downstream.Like this, can confirm that from Fig. 4 decoking begins to carry out from upstream side.
In this experiment, after in decoking, making oxygen concentration in the oxidant drop to less than 5% (about 4.7%) from 12%, descending almost side by side with oxygen concentration, the gas temperature of each one and iron sheet temperature begin to reduce, make the oxygen concentration in the oxidant rise to once more at 12% o'clock, gas temperature and the rising of iron sheet temperature in each one.Its result represents can adjust gas temperature by the oxygen concentration in the oxidant is changed.
In the present embodiment, the downside inwall of the contracted flow portion of pipe arrangement and pipe arrangement rake 16 shown in Figure 2 etc. relatively the pipe arrangement inwall that is obliquely installed of vertical direction easily pile up the thermal decomposition attachment.In addition, flow through under the situation of pipe arrangement with low flow velocity, easily pile up the ash content that produces by combustion decomposition at the downside inwall of pipe arrangement rake at oxidant (mist).In the present embodiment, also can spray compressed air to the position that thermal decomposition attachment and ash content in decoking are easily piled up.
Fig. 5 is the part sectioned view of pipe arrangement rake.Be provided with two nozzles 20 on the top of pipe arrangement rake 16.Nozzle 20 is connected with air blast (not shown).Nozzle 20 is configured to be contacted by the roughly the same position of air blast compressed and supplied air with the downside inwall of pipe arrangement rake 16 among Fig. 5.
For pipe arrangement rake 16, can said nozzle be set in the many places of airflow direction.The nozzle of airflow direction for example is provided with at interval and goes out the position or the distance till disappearing that arrive pipe arrangement (thermal decomposition attachment) from the compressed air of nozzle ejection by analog computation and determine.
From the compressed-air actuated injection of nozzle 20 with specific time interval for example about pressure 0.5MPa, implement under the condition of ejaculation amount 200l/s.Injection interval considers to adhere to/pile up the suitably settings such as the rate of climb of the pressure loss that produces.Utilize the collision of the accumulation horizon of compressed air bump thermal decomposition attachment, crack at the accumulation horizon of the thermal decomposition attachment that is formed at pipe arrangement downside inwall.In addition, produce by combustion decomposition and the ash content piled up with compressed air side flow downstream.Thus, in the part that has cracked, new reaction surface contacts with oxidant, promotes the combustion decomposition of thermal decomposition attachment.
In addition, also can in the thermal decomposition gasification reaction, implement from the compressed-air actuated injection of nozzle.Thus, before formed thermal decomposition attachment thickening on the pipe arrangement inwall, the thermal decomposition attachment can be peeled off removal.Its result can suppress the thermal decomposition adhesion amount, and the rapid temperature in the time of can preventing decoking rises, and can further cut down the decoking required time.
The thermal decomposition attachment removal of present embodiment is that the partial combustion under the low oxygen concentration is decomposed, the combustion furnace in the waste gas instant heating decomposition gas arrival downstream that therefore produces in above-mentioned thermal decomposition attachment is removed.Thermal decomposition gas, mixes with the auxiliary fuels of supplying with from upper furnace such as town gas and burns to the burning furnace injection from the gas burner that is arranged on upper furnace.Furnace temperature during the thermal decomposition gas combustion is about 700 ℃.In thermal decomposition gas, comprise a large amount of CO, thus, CO completing combustion and generate CO
2, discharge from combustion furnace.
Claims (15)
1. thermal decomposition attachment removal method, in the thermal decomposition gasification system of living beings such as downflow sludge, Wooden Biomass,
Making oxygen concentration is that 5 volume % mist above and inactive gas below the 13 volume % and oxygen circulates to the pipe arrangement that is arranged between thermal decomposition gasification furnace and the combustion furnace, under gas temperature is condition more than 500 ℃, makes attached to the burning of the thermal decomposition attachment on the inwall of described pipe arrangement and remove.
2. thermal decomposition attachment removal method as claimed in claim 1 wherein, is to remove described thermal decomposition attachment under the condition below 650 ℃ at described gas temperature.
3. thermal decomposition attachment removal method as claimed in claim 1 wherein, is removed described thermal decomposition attachment under the iron sheet temperature of described pipe arrangement is condition below 600 ℃.
4. thermal decomposition attachment removal method as claimed in claim 1 wherein, is supplied with the described mist of normal temperature in described pipe arrangement.
5. thermal decomposition attachment removal method as claimed in claim 2 wherein, is supplied with the described mist of normal temperature in described pipe arrangement.
6. thermal decomposition attachment removal method as claimed in claim 3 wherein, is supplied with the described mist of normal temperature in described pipe arrangement.
7. thermal decomposition attachment removal method as claimed in claim 4 wherein, is supplied with described mist in the pipe arrangement that is arranged on described pipe arrangement air blast upstream side midway.
8. thermal decomposition attachment removal method as claimed in claim 5 wherein, is supplied with described mist in the pipe arrangement that is arranged on described pipe arrangement air blast upstream side midway.
9. thermal decomposition attachment removal method as claimed in claim 6 wherein, is supplied with described mist in the pipe arrangement that is arranged on described pipe arrangement air blast upstream side midway.
10. thermal decomposition attachment removal method as claimed in claim 1, wherein, at a place of described pipe arrangement or the gas temperature in the described pipe arrangement of many places instrumentation, this instrumentation to gas temperature at least one value when surpassing 650 ℃, make the oxygen concentration of the described mist that in described pipe arrangement, circulates reduce to less than 5 volume %.
11., wherein, spray the compressed air of normal temperature to the inwall of the sloping portion of described pipe arrangement as each described thermal decomposition attachment removal method in the claim 1～10.
12. thermal decomposition attachment removal method as claimed in claim 1, wherein, described thermal decomposition attachment burning and the waste gas that produces mixes with auxiliary fuel in described combustion furnace, and in temperature oxidized processing more than 700 ℃.
13. a thermal decomposition gasification system is the thermal decomposition gasification system of living beings such as downflow sludge, Wooden Biomass, wherein, possesses:
The thermal decomposition gasification furnace;
Be arranged on the combustion furnace in this thermal decomposition gasification furnace downstream;
Be arranged on the pipe arrangement between described thermal decomposition gasification furnace and the described combustion furnace,
Also possess:
The oxidant supply port is connected with described pipe arrangement, is used for to the oxidant of described pipe arrangement supply as the mist of inactive gas and oxygen;
The oxidant adjustment part is used for oxygen concentration with described oxidant and is adjusted into more than the 5 volume % and below the 13 volume %;
Be used for the heating part that the inwall to described pipe arrangement heats;
To carry out the gas temperature test section of instrumentation in the temperature of the gas of the inboard of described pipe arrangement circulation; And
Be used to control the gas temperature control part of described gas temperature.
14. thermal decomposition gasification system as claimed in claim 13, wherein, the mixing portion that described oxidant adjustment part possesses the pipeline that is used to be collected in the waste gas of circulation in the described pipe arrangement and this waste gas of collecting and air are mixed.
15. thermal decomposition gasification system as claimed in claim 13 wherein, also possesses at the inwall of described pipe arrangement and to be used to spray compressed-air actuated nozzle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-196670 | 2009-08-27 | ||
| JP2009196670 | 2009-08-27 |
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| CN102000681A true CN102000681A (en) | 2011-04-06 |
| CN102000681B CN102000681B (en) | 2014-03-12 |
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| CN201010249036.5A Active CN102000681B (en) | 2009-08-27 | 2010-08-06 | Thermal decomposition adhesive material removing method and thermal decomposition gasification system |
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| JP (1) | JP5713592B2 (en) |
| CN (1) | CN102000681B (en) |
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| CN106001012A (en) * | 2016-06-03 | 2016-10-12 | 上海华钢不锈钢有限公司 | Heat removal system and method for removing residues on inner surface of steel pipe by means of heat removal system |
| CN111630319A (en) * | 2017-11-29 | 2020-09-04 | 川崎重工业株式会社 | Fluidized bed furnace |
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| JP6016367B2 (en) * | 2012-01-30 | 2016-10-26 | 三菱重工環境・化学エンジニアリング株式会社 | Method for suppressing generation of pyrolysis deposits in pyrolysis gasification system and pyrolysis gasification system |
| HK1202574A1 (en) | 2012-05-18 | 2015-10-02 | 日本蓝色能源株式会社 | Biomass gasifier device |
| CA2913293C (en) | 2013-07-11 | 2017-10-24 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. | Method for inhibiting occurrence of pyrolysis deposit in pyrolysis gasification system, and pyrolysis gasification system |
| US10059886B2 (en) | 2014-08-07 | 2018-08-28 | Inaeris Technologies, Llc | Rejuvenation of biopyrolysis oil hydroprocessing reactors |
| WO2022209196A1 (en) * | 2021-03-29 | 2022-10-06 | Ｕｂｅ三菱セメント株式会社 | Apparatus for carbonizing biomass |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2011068859A (en) | 2011-04-07 |
| CN102000681B (en) | 2014-03-12 |
| JP5713592B2 (en) | 2015-05-07 |
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