WO2024251709A1 - Production de puzzolana respectueuse du climat - Google Patents

Production de puzzolana respectueuse du climat Download PDF

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Publication number
WO2024251709A1
WO2024251709A1 PCT/EP2024/065279 EP2024065279W WO2024251709A1 WO 2024251709 A1 WO2024251709 A1 WO 2024251709A1 EP 2024065279 W EP2024065279 W EP 2024065279W WO 2024251709 A1 WO2024251709 A1 WO 2024251709A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotary kiln
hot gas
clay
gas
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/065279
Other languages
German (de)
English (en)
Inventor
Guido Grund
Eugen Wagner
Dirk Schefer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp AG
Thyssenkrupp Polysius GmbH
Original Assignee
ThyssenKrupp AG
Thyssenkrupp Polysius GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from LU103142A external-priority patent/LU103142B1/de
Priority claimed from DE102023114757.9A external-priority patent/DE102023114757A1/de
Application filed by ThyssenKrupp AG, Thyssenkrupp Polysius GmbH filed Critical ThyssenKrupp AG
Priority to CN202480038021.4A priority Critical patent/CN121311728A/zh
Priority to EP24731532.8A priority patent/EP4702299A1/fr
Publication of WO2024251709A1 publication Critical patent/WO2024251709A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/06—Rotary-drum furnaces, i.e. horizontal or slightly inclined adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/36—Arrangements of air or gas supply devices
    • F27B7/362—Introducing gas into the drum axially or through the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/383—Cooling devices for the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F27D13/005—Drying of green clay prior to baking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/028—Cooling with means to convey the charge comprising a rotary drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • F27D17/22—Arrangements for treatment or cleaning of waste gases for removing solid constituents
    • F27D17/25—Arrangements for treatment or cleaning of waste gases for removing solid constituents using cyclones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases or liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases or liquids
    • F27D2007/023—Conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln

Definitions

  • the invention relates to a device and a method for producing a thermally activated clay, an artificial pozzolan, in a rotary kiln.
  • activated clays also known as artificial pozzolans
  • the energy source and thus the fuel used is the main source of carbon dioxide emissions.
  • alternative fuels are increasingly being used, although these are more demanding to burn.
  • a plant for the production of cement clinker is known from DE 10 2004 009 689 A1. From DE 10 2012 108 295 A1 a device and a method for processing substitute fuels are known.
  • a clinker substitute based on calcined clay is known from US 2014 / 000 491 A1.
  • the object of the invention is to provide a device with a rotary kiln for the thermal activation of clays, which does not require the firing of primary raw materials such as oil or gas in the rotary kiln and can thus be operated in a particularly climate-friendly manner.
  • the device according to the invention serves to produce a thermally activated clay.
  • the device has a rotary kiln and a hot gas generating device that is separate from the rotary kiln.
  • the separation enables the Process conditions are possible so that, for example, substitute fuel can be produced in the hot gas generation device under conditions that are optimal for the combustion of the substitute fuel, while the process conditions in the rotary kiln can be optimized for the activation of the clay.
  • the hot gas generation device and the rotary kiln are connected via a gas line to transfer hot gases generated in the hot gas generation device. Since only the hot gas is transferred through the gas line, this has the advantage of separating the two thermal processes.
  • the hot gas generation device is a combustion device for a substitute fuel or an electric gas heater. It is therefore a discrete hot gas generation device whose function is to generate hot gas and not a process in which hot gas is produced as a waste product.
  • the use of a combustion device for a substitute fuel and/or an electric gas heater enables the CO2-free generation of thermal energy, for example when biomass is used as a substitute fuel or electricity from a renewable source is used for the electric gas heater.
  • a substitute fuel can of course be a mixture within the meaning of the invention. Substitute fuels are, for example, waste or biomass or even a mixture of these.
  • the device has a first temperature sensor.
  • the first temperature sensor is an infrared sensor.
  • the first temperature sensor is arranged in the outlet area below the rotary kiln. This special arrangement enables contactless (wear-free) measurement of the temperature of the activated clay. With the usual measurement from above, a temperature measurement that is not as reliable is possible because dust influences the measurement. Measuring the emerging material from the bottom, on the other hand, has proven to be very reliable.
  • the device has a second temperature sensor.
  • the second temperature sensor is in or on the rotary kiln arranged.
  • the second temperature sensor can be arranged on the outside of the rotary kiln.
  • the second temperature sensor can be arranged in a fireproof protective tube inside the rotary kiln. This makes it possible to measure the material in the rotary kiln.
  • the second temperature sensor can, for example, be surrounded and protected on three sides by a metal guard.
  • the gas line has a length such that the gas within the gas line has a residence time of between 0 and 10 s, preferably between 0.5 and 10 s.
  • the gas line can thus be shorter, for example, but with a larger inner diameter, or longer and with a smaller inner diameter.
  • the gas line preferably has a length such that the gas within the gas line has a residence time of between 1 and 5 s.
  • the gas line is also preferably long such that the gas within the gas line has a residence time of between 1.5 and 2.5 s. This residence time in the gas line can ensure safe burnout if this has not already occurred in the hot gas generation device. This thus enables the use of a hot gas generation device which itself does not, for example, meet the legal requirements for safe burnout.
  • other measures can be used, such as the supply of ammonia or urea to remove possible nitrogen oxides. Appropriate reaction times are also useful for this.
  • the device has a material cooler.
  • the rotary kiln is connected to the material cooler for transferring the thermally treated clay.
  • the material cooler is connected to the hot gas generation device for transferring gas preheated in the material cooler. This cools the finished product on the one hand and returns the heat to the process on the other.
  • a dust filter is preferably arranged between the material cooler and the hot gas generation device. The dust separated in this way is preferably fed to the finished product.
  • the material cooler is a drum cooler.
  • the gas flow in the drum cooler is guided countercurrently to the material flow.
  • the material cooler is a walking floor, two-layer cooler or grate cooler.
  • the material cooler is a cyclone or fluidized bed cooler.
  • the advantage is that much faster cooling can be achieved here.
  • the disadvantage is that the maximum particle size of the activated clay is limited to a particle size that can be flown (for example, less than 2 mm).
  • a comminution device is arranged between the rotary kiln and the material cooler.
  • the comminution device is, for example, a roller crusher.
  • the comminution device can in particular be cooled, preferably air-cooled. This is particularly preferred if the material cooler is a cyclone or fluidized bed cooler.
  • a screen in particular a drum screen, is arranged between the rotary kiln and the material cooler.
  • a crusher is particularly preferably arranged behind the coarse outlet of the screen, in particular the drum screen. This allows the amount of hot material to be crushed that is applied to the crusher to be significantly reduced, so that heat is less of a problem.
  • the sieve can also be designed as a static sieve, in particular as a sieve with an inclination of 30° to 60°. This enables purely gravity-driven transport and thus active conveying can be dispensed with.
  • the sieve has a mesh size of 2 mm so that particles smaller than 2 mm can pass through and particles larger than 2 mm are retained.
  • the device has a product return.
  • the product return is designed to return product cooled in the material cooler between the rotary kiln and the material cooler. This is particularly preferred if a comminution device is arranged between the rotary kiln and the material cooler, since in this way, by mixing hot activated clay coming from the rotary kiln with cold, returned activated clay, rapid cooling and thus lower thermal load for the comminution device can be achieved.
  • a comminution device is arranged between the rotary kiln and the material cooler, since in this way, by mixing hot activated clay coming from the rotary kiln with cold, returned activated clay, rapid cooling and thus lower thermal load for the comminution device can be achieved.
  • the device has a pre-cooler.
  • the pre-cooler is arranged between the rotary kiln and the material cooler.
  • the pre-cooler has direct or indirect water cooling. With direct water cooling, water is applied directly to the activated clay, in particular sprayed on. This enables extremely fast and efficient cooling, which is particularly advantageous in order to avoid a change in the color of the activated clay after thermal treatment, in which the activated clay comes into contact with oxygen at high temperatures. With indirect water cooling, the water is sprayed onto the outside of the pre-cooler and thus the pre-cooler itself is cooled down considerably. The disadvantage of the process is the low efficiency in recovering the heat.
  • the rotary kiln has internals for the vertical conveyance of the clay.
  • the internals for the vertical conveyance of the clay serve to lift the clay, whereby it is then transported by the gas flow inside of the rotary kiln, which optimizes the heat transfer from the gas flow to the clay.
  • the fittings can be straight, angled or curved. They can be honeycomb or cross fittings or they can be chain elements. It is important that the clay is at least partially lifted by the fittings and thus at least partially falls back down again through the gas flow. Since the wear of the fittings is highly temperature-dependent, these fittings are preferably only installed in the side of the rotary kiln facing away from the hot gas generation device, i.e. in areas of the rotary kiln where the temperature of the clay is below 650 °C, possibly below 500 °C.
  • the rotary kiln has retaining rings. This increases the filling level in the rotary kiln, increases the residence time and thus improves the heat transfer from the gas phase to the clay to be activated.
  • the rotary kiln preferably has one or more retaining rings.
  • the gas line has a nitrogen supply for removing nitrogen oxides.
  • a nitrogen supply for removing nitrogen oxides.
  • ammonia, aqueous ammonia solution, urea solution or the like can be supplied via the nitrogen supply, so that the supplied nitrogen is synproportioned with nitrogen oxides and the nitrogen oxides are thus removed.
  • Further possible embodiments can be found in particular in DE 10 2022 209 826.
  • an induced draft fan is arranged behind the rotary kiln in the gas flow direction. Due to the high temperatures in the gas line between the hot gas generating device and the rotary kiln, no fan can be arranged there, so that the conveying capacity is preferably completely provided by the induced draft fan. This in turn leads to the pressure in the hot gas generating device being higher than the pressure in the rotary kiln. Due to the usually very low negative pressure in the rotary kiln, this leads to the hot gas generating device having practically no negative pressure, and possibly even a small positive pressure. Such operation is unusual for the combustion of substitute fuels.
  • a dust filter is arranged behind the rotary kiln in the direction of gas flow.
  • the dust filter is connected to the rotary kiln to return the separated dust. Due to the indirect heating and the associated higher gas flow through the rotary kiln, a higher level of dust development and thus a discharge of very fine material with the gas flow from the rotary kiln is to be expected.
  • the rotary kiln has a larger diameter in the middle area.
  • the middle area between the first race and the second race is widened.
  • the middle area also contains the middle temperature range. The widening reduces the flow velocity in this area, which in turn reduces the discharge of fine material and improves the heat exchange between gas and clay in this area.
  • the device has a preheater and/or a dryer.
  • the preheater or dryer is arranged behind the rotary kiln in terms of gas flow and in front of the rotary kiln in terms of material flow. Drying and heating can also take place completely and exclusively in the rotary kiln, but due to the larger gas flow caused by the external generation of the hot gas flow, it is advantageous if the heat transfer takes place in an additional dryer and/or preheater.
  • the preheater can be designed as a cascade of cyclone preheaters or as a riser heat exchanger with a longer residence time and a separation cyclone.
  • a drum dryer is preferably used as the dryer. The advantage of the drum dryer is that it can also work with very coarse particles (down to the cm range). A mill or a crusher with a subsequent riser dryer with a separation cyclone can also be used as a dryer.
  • the hot gas generating device is a combustion device for a substitute fuel.
  • the combustion device is particularly preferably designed for the combustion of biomass. Alternatively, it can It would be an electrically operated superheater, which would also be climate-neutral when operated with electricity generated from renewable sources.
  • the combustion device has a gas-tight solids discharge. This makes it possible to operate the combustion device even at excess pressure.
  • the combustion device is a reverse-acting grate, a rotary kiln, a direct-current grate or a rotary hearth.
  • the rotary kiln has an auxiliary combustion device.
  • substitute fuels for example biomass
  • the device has a mixing device.
  • the mixing device is designed to mix the clay with a reducing agent.
  • the mixing device is arranged in front of the rotary kiln in the direction of material flow.
  • the mixing device can be arranged, for example, between a dryer and the rotary kiln.
  • Coal can be used as a reducing agent, for example.
  • Unburned carbon residues from the combustion device can also be used, for example.
  • the mixing creates a locally reducing atmosphere around the clay to be activated in the rotary kiln, which in turn prevents the clay from taking on an undesirable color, for example due to the oxidation of iron. It is important, however, that only as little reducing agent as possible is used so that no reducing agent ends up in the finished product and does not cause any disruption.
  • the rotary kiln has at least one laterally arranged feed device for a reducing agent.
  • the laterally arranged feed device can be, for example, a so-called scoop feeder. This allows the reducing agent to be fed directly, in particular into the correct temperature range.
  • the rotary kiln has at least one air supply arranged on the side.
  • oxygen-containing gas can be supplied through the air supply. This enables complete combustion of, for example, a reducing agent or its gaseous reaction products. At the same time, an extremely oxygen-poor environment can be maintained, especially in the area of the highest temperature.
  • the invention relates to a method for operating a device according to the invention.
  • the clay is thermally activated in a rotary kiln by means of hot gas generated outside the rotary kiln.
  • the hot gas generation device can be carried out using a substitute fuel at sufficiently high temperatures with sufficient oxygen over a sufficiently long time, whereas the thermal activation is carried out in particular at lower temperatures and preferably with a very low oxygen content.
  • the hot gas is fed to the rotary kiln at a temperature of 600 to 1800 °C.
  • a temperature of 800 to 1200 °C is preferred, and 600 to 1800 °C with an electric gas heater.
  • the highest temperatures are preferably achieved when combining a combustion device for a substitute fuel and an electric gas heater.
  • This temperature range is sometimes very significantly higher than that of the thermal treatment of clays.
  • this temperature window has proven to be sufficient and not too high; good activation takes place without deactivation due to excessively high temperatures. This is important because the amount of heat supplied in this way must be sufficient for activation, since activation is only activated by the hot gas supplied from outside, so no additional combustion or other energy supply takes place within the rotary kiln.
  • the pressure in the combustion device is higher than the pressure in the rotary kiln.
  • This mode of operation is preferred in order to be able to work in terms of gas flow behind the rotary kiln using only an induced draft fan.
  • the pressure in the hot gas generation device can be selected to be around or above the ambient pressure.
  • the temperature in the combustion device is selected to be higher than the temperature in the rotary kiln. This enables the safe combustion of substitute fuels, such as biomass, without this having a negative effect on the product quality, since too high a temperature leads to deactivation of the clay.
  • the temperature in the rotary kiln is regulated by supplying substitute fuel to the combustion device.
  • the clay is fed into the rotary kiln together with a reducing agent.
  • the reducing agent can be, for example, coal, wood or other biogenic materials, preferably incompletely burned residues from the combustion of a substitute fuel.
  • a local reducing atmosphere is created in the area of the clay to be activated in the rotary kiln, which prevents, for example, iron in the clay from oxidizing and thus the clay from acquiring a product takes on an undesirable color. This further supports the separation between the conditions during hot gas generation and activation, as the oxygen concentration can also be selected more freely.
  • oxygen or an oxygen-containing gas mixture is introduced into the rotary kiln in a process gas temperature range of 400 to 850 °C, preferably 500 to 650 °C. This is preferably done to ensure the complete burnout of incompletely converted combustion products of the organic components of the feed material (clay) and/or the incompletely converted reaction products of a reducing agent.
  • the oxygen content in the gas line after the hot gas generation device is selected to be below 2 vol.%, preferably below 1 vol.%. This minimizes the oxidation of a clay and thus an unwanted color change.
  • the hot gas generating device is heated electrically.
  • green electricity it is also possible to avoid carbon dioxide emissions.
  • the activation is controlled so that the hot gas leaves the rotary kiln at the kiln inlet at 100 to 600 °C.
  • Fig. 1 shows a first example of a device according to the invention.
  • the clay to be activated is fed via a clay feed into a dryer 40, for example a drum dryer. From there, the clay is transferred to a rotary kiln 10 and thermally treated there.
  • the activated clay is transferred from the rotary kiln 10 into a material cooler 30 and cooled there.
  • the temperature of the clay is recorded by means of a temperature sensor 11, which is arranged below the rotary kiln 10 and can thus record the temperature without contact using infrared and without heavy dust pollution, without wear.
  • the cooled activated product is removed from the material cooler 30 via the product outlet 32. This is the material flow through the device. The gas flow runs in countercurrent to this.
  • the cold gas is fed to the material cooler 30 via the gas feed 31 and heated there.
  • the heated gas is fed to a dust filter 50.
  • the separated dust is fed to the product at the product outlet 32.
  • the dust-free heated gas is fed to the hot gas generating device 20.
  • a substitute fuel for example biomass
  • Residues of the substitute fuel are discharged via a lock 22 so that the hot gas generation device 21 can be operated under a slight overpressure.
  • the hot gas generated in the hot gas generation device 21 is led into the rotary kiln 10 via a gas line 23 which is long enough so that the hot gas stays in the gas line 23 for about 5 s. There, the heat is transferred to the clay to be activated and thus the clay is activated. Since the heat is not generated within the rotary kiln 10, it can be assumed that part of the heat is transferred indirectly, i.e. first from the gas to the rotary kiln 10 and then from the rotary kiln 10 to the clay, since the surface of the rotary kiln 10 is larger than the surface of the clay in the rotary kiln 10.
  • the gas which has been significantly cooled in the rotary kiln 10, is led from the rotary kiln 10 into the dryer 40.
  • the dryer 40 is designed as a drum dryer. The gas is then discharged from the dryer 40 via the exhaust gas 42.
  • Fig. 2 shows a second example of a device according to the invention.
  • the clay is fed via the clay feed 41 into a preheater 43, which is designed as a cascaded entrained flow heat exchanger.
  • the material preheated in the preheater 43 is transferred to the rotary kiln 10 and thermally activated there.
  • the material activated in the rotary kiln 10 is fed past the temperature sensor 11 onto a sieve 60.
  • particles larger than 2 mm are fed into a crusher 61, and the free material smaller than 2 mm from the sieve 60 together with the material crushed in the crusher 61 is fed into a mixer 62 and mixed there with cold, returned material and then cooled in a material cooler 30 in the form of an entrained flow heat exchanger.
  • the activated and cooled material leaving the material cooler 30 is divided and partly returned to the mixer 62 via the product return 33 and partly discharged via the product outlet 32.
  • the gas flow is guided analogously to the first example, only a dust filter 50 is arranged after the preheater 43 in order to transfer the finest material via the preheater 43 back into the rotary kiln 10 and thus ultimately into the finished product.
  • the third example shown in Fig. 3 differs from the example shown in Fig. 2 in that the temperature sensor 11 is arranged below the sieve 60.
  • the fourth example shown in Fig. 4 differs from the second example shown in Fig. 2 in that the screen 60 is designed as a drum screen and is arranged on the same level as the rotary kiln 10. Therefore, the gas line 23 of the hot gas generating device 20 is connected to the screen 60 so that the hot gas is fed to the rotary kiln 60 through the drum screen. Therefore, the temperature sensor 11 is also arranged behind the screen 60.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

La présente invention concerne un dispositif de production d'une argile activée thermiquement, le dispositif comprenant un four rotatif (10) et un dispositif de génération de gaz chaud (20) séparé du four rotatif (10), le dispositif de génération de gaz chaud (20) et le four rotatif (10) étant reliés par une conduite de gaz (23) pour transférer des gaz chauds générés dans le dispositif de génération de gaz chaud (20).
PCT/EP2024/065279 2023-06-06 2024-06-04 Production de puzzolana respectueuse du climat Pending WO2024251709A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202480038021.4A CN121311728A (zh) 2023-06-06 2024-06-04 气候友好的火山灰生产
EP24731532.8A EP4702299A1 (fr) 2023-06-06 2024-06-04 Production de puzzolana respectueuse du climat

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU103142A LU103142B1 (de) 2023-06-06 2023-06-06 Klimaschonende Puzzolanerzeugung
LULU103142 2023-06-06
DE102023114757.9 2023-06-06
DE102023114757.9A DE102023114757A1 (de) 2023-06-06 2023-06-06 Klimaschonende Puzzolanerzeugung

Publications (1)

Publication Number Publication Date
WO2024251709A1 true WO2024251709A1 (fr) 2024-12-12

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Country Link
EP (1) EP4702299A1 (fr)
CN (1) CN121311728A (fr)
WO (1) WO2024251709A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004009689A1 (de) 2004-02-27 2005-09-08 Polysius Ag Anlage zur Herstellung von Zementklinker
US20140000491A1 (en) 2011-03-18 2014-01-02 Outotec Oyj Clinker substitute based on calcined clay
DE102012108295A1 (de) 2012-09-06 2014-05-15 Thyssenkrupp Resource Technologies Gmbh Vorrichtung und Verfahren zur Verarbeitung von Ersatzbrennstoffen
WO2018195642A1 (fr) 2017-04-26 2018-11-01 Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources Canada Précipitation directe d'oxalate pour la récupération d'éléments de terres rares
CN113387367A (zh) 2021-06-29 2021-09-14 厦门欣意盛新材料科技有限公司 一种城市建筑工程渣土资源化利用制备高岭土方法
DE102020211750A1 (de) 2020-09-21 2022-03-24 Thyssenkrupp Ag Energierückgewinnung bei der Kühlung farboptimierter aktivierter Tone
WO2022058206A1 (fr) 2020-09-21 2022-03-24 Thyssenkrupp Industrial Solutions Ag Récupération d'énergie dans le refroidissement d'argiles actives à couleur optimisée
US20230002277A1 (en) 2019-12-18 2023-01-05 Holcim Technology Ltd Method of producing cement clinker and a second calcined material
US20230110304A1 (en) 2021-10-13 2023-04-13 Coolbrook Oy Method and apparatus for manufacturing cement using rotary generated thermal energy
DE102022209826A1 (de) 2022-09-19 2024-03-21 Thyssenkrupp Ag Vermeidung von Emissionen bei der Herstellung künstlicher Puzzolane aus mineralischem Material, insbesondere Tonen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004009689A1 (de) 2004-02-27 2005-09-08 Polysius Ag Anlage zur Herstellung von Zementklinker
US20140000491A1 (en) 2011-03-18 2014-01-02 Outotec Oyj Clinker substitute based on calcined clay
DE102012108295A1 (de) 2012-09-06 2014-05-15 Thyssenkrupp Resource Technologies Gmbh Vorrichtung und Verfahren zur Verarbeitung von Ersatzbrennstoffen
WO2018195642A1 (fr) 2017-04-26 2018-11-01 Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources Canada Précipitation directe d'oxalate pour la récupération d'éléments de terres rares
US20230002277A1 (en) 2019-12-18 2023-01-05 Holcim Technology Ltd Method of producing cement clinker and a second calcined material
DE102020211750A1 (de) 2020-09-21 2022-03-24 Thyssenkrupp Ag Energierückgewinnung bei der Kühlung farboptimierter aktivierter Tone
WO2022058206A1 (fr) 2020-09-21 2022-03-24 Thyssenkrupp Industrial Solutions Ag Récupération d'énergie dans le refroidissement d'argiles actives à couleur optimisée
CN113387367A (zh) 2021-06-29 2021-09-14 厦门欣意盛新材料科技有限公司 一种城市建筑工程渣土资源化利用制备高岭土方法
US20230110304A1 (en) 2021-10-13 2023-04-13 Coolbrook Oy Method and apparatus for manufacturing cement using rotary generated thermal energy
DE102022209826A1 (de) 2022-09-19 2024-03-21 Thyssenkrupp Ag Vermeidung von Emissionen bei der Herstellung künstlicher Puzzolane aus mineralischem Material, insbesondere Tonen

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EP4702299A1 (fr) 2026-03-04
CN121311728A (zh) 2026-01-09

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