WO2024046818A1 - Réduction des émissions de co2 lors de la production de clinker de ciment - Google Patents

Réduction des émissions de co2 lors de la production de clinker de ciment Download PDF

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Publication number
WO2024046818A1
WO2024046818A1 PCT/EP2023/073055 EP2023073055W WO2024046818A1 WO 2024046818 A1 WO2024046818 A1 WO 2024046818A1 EP 2023073055 W EP2023073055 W EP 2023073055W WO 2024046818 A1 WO2024046818 A1 WO 2024046818A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft furnace
shaft
raw material
fraction
plant
Prior art date
Application number
PCT/EP2023/073055
Other languages
German (de)
English (en)
Inventor
Jost Lemke
Eike Willms
Constantin KIMMIG
Original Assignee
thyssenkrupp Polysius GmbH
Thyssenkrupp Ag
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 BE20225684A external-priority patent/BE1030823B1/de
Priority claimed from DE102022208981.2A external-priority patent/DE102022208981A1/de
Application filed by thyssenkrupp Polysius GmbH, Thyssenkrupp Ag filed Critical thyssenkrupp Polysius GmbH
Publication of WO2024046818A1 publication Critical patent/WO2024046818A1/fr

Links

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 peculiar to rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • F27B7/2033—Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • C04B7/367—Avoiding or minimising carbon dioxide emissions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4469—Burning; Melting in shaft or vertical kilns
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4476—Selection of the kiln 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey

Definitions

  • the invention relates to a device and a method for the simple partial separation of CO2, which is produced during the production of cement clinker
  • a lime shaft kiln is known from DE 10 2021 204 175.
  • a ring shaft furnace is known from DE 10 2021 202 485.
  • the object of the invention is to provide a plant for the production of cement clinker, which, starting from a conventional plant, separates part of the CO2 in a simple manner.
  • the system according to the invention is used to produce cement clinker.
  • the plant has a raw material supply, a mill, a preheater, a calciner, an oven and a material cooler.
  • the provision of raw materials can be a dump, a delivery point, for example an unloading station, a silo or the like.
  • the material flow is led from the raw material supply via the mill, the preheater, the calciner, the oven and the material cooler.
  • the material cooler has a product outlet.
  • This is a conventional plant for producing cement clinker. In particular, it can also be an existing plant for the production of cement clinker, which is within the meaning of the invention is revised in order to easily reduce part of the CCh emissions.
  • the plant for producing cement clinker according to the generic term is therefore known to those skilled in the art.
  • a corresponding system according to the prior art is thus modified in a manner according to the invention in order to separate a portion of the CO2 in a simple manner and thus to quickly at least reduce the climate impact as part of a simple measure.
  • the system has a screening device.
  • the screening device is connected to the raw material supply for supplying raw material.
  • the screening device is designed to separate a coarse particle stream and a fine particle stream.
  • the separation between coarse particles and fine particles is preferably between 5 mm and 50 mm, although of course an exact separation precision is not necessary and does not make sense from a technical point of view. For example, even fine particles can unintentionally end up in the coarse fraction during a sieving process.
  • the separation between coarse particles and fine particles is therefore between 5 mm and 50 mm.
  • a sieve with a hole size of 30 mm is used, so in the ideal case this would theoretically result in a fine particle fraction with all particles smaller than 30 mm and a coarse particle fraction with particles larger than 30 mm.
  • the fine particle fraction is therefore found in the fine particle stream and the coarse particle fraction is found in the coarse particle stream.
  • the system has a shaft furnace.
  • Shaft furnaces are well known, by way of example and preferably it can be a shaft furnace according to DE 10 2021 204 175 or according to DE 10 2021 202 485.
  • the screening device is connected to the shaft furnace to transfer the stream of coarse particles. Only the coarse particle fraction is then thermally treated in the shaft furnace.
  • the shaft furnace is connected to the mill for transferring the thermally treated raw material.
  • GGR shaft furnace known for example from WO 2011/072894 A1
  • Oxidizing gas is added to the combustion shaft
  • Direct current with the material and fuel is supplied, with the resulting hot exhaust gases together with the heated cooling air supplied from below being passed via the overflow channel into the exhaust shaft, where the exhaust gases are discharged upwards in countercurrent to the material and thereby preheat the material.
  • the material is usually fed into the shaft from above together with the oxidizing gas, with fuel being injected into the combustion zone.
  • the material to be burned usually passes through a preheating zone in each shaft for preheating the material, an adjoining burning zone in which the material is burned and an adjoining cooling zone in which cooling air is supplied to the hot material.
  • a second advantage is that the grindability of the material and thus in particular the large particles is improved by the thermal treatment.
  • Complete decarbonization does not have to be achieved in the shaft furnace. Rather, for the most efficient use of the entire system, it is advantageous, for example, to only decarbonize the coarse particle fraction by 80 to 90%.
  • the material thermally treated in the shaft furnace is fed via the mill to the usual process in the preheater, calciner and oven, so that complete thermal treatment takes place here, especially in the oven.
  • the shaft furnace reduces the fuel requirement in the calciner as well as the release of CO2 from the starting material. This means that the existing system can remain unchanged; the CO2 is simply separated for the CO2 emissions of the shaft furnace.
  • a lime kiln system includes at least one shaft kiln for firing and cooling material such as carbonate rock, the lime kiln system comprising two shafts and a channel extending between the two shafts.
  • the shaft kiln comprises exactly one of the shafts of the lime kiln system, the shaft having a material inlet for admitting material to be burned into the shaft and, in the direction of flow of the material, a preheating zone for preheating the material, a firing zone for firing the material, a cooling zone for cooling the material and a material outlet for discharging the material from the shaft having.
  • the channel has a closure device for gas-technical closure of the channel, so that a gas flow between the two shafts through the channel is prevented by means of the closure device.
  • the material to be burned is preferably limestone or dolomite stone with a grain size of 10 to 200 mm, preferably 15 to 120 mm, most preferably 30 to 100 mm.
  • the cooling gas is, for example, air.
  • the lime kiln system is preferably a shaft kiln that can be operated as a cocurrent-countercurrent regenerative shaft kiln, the channel for connecting the shafts, in particular the combustion zones of the shafts, being closed.
  • the lime kiln system has at least one shaft kiln.
  • the shaft kiln system has two shaft kilns, each of which includes exactly one of the shafts of the lime kiln system.
  • the shaft furnaces are preferably separated from one another in terms of gas technology and can in particular be operated separately from one another for burning material.
  • the shaft of the at least one shaft kiln of the lime kiln system preferably has a material inlet for admitting material to be burned into the shaft, the material inlet being located in particular at the upper end of the shaft, so that the material falls into the shaft due to gravity.
  • the material inlet and/or the material outlet is/are designed in particular as a lock for letting in and/or letting out material into the shaft furnace.
  • a material inlet designed as a lock is preferably designed in such a way that only the raw material to be burned gets into the shaft, but not the ambient air.
  • the lock is preferably designed in such a way that it seals the shaft airtight from the environment and allows solids, such as the material to be burned, to enter the shaft.
  • the material flows through a preheating zone following the material inlet for preheating the material to a temperature of, for example, approximately 600 ° C to 800 ° C.
  • the firing zone preferably adjoins the preheating zone directly and serves to burn the material, which is preferably heated to a temperature of approximately 900 ° C to 1600 ° C.
  • the cooling zone preferably adjoins the firing zone directly and serves to cool the fired material to a temperature of, for example, 100 ° C.
  • the material outlet is arranged, for example, in an outlet funnel adjoining the cooling zone, the material outlet having, for example, a turntable or push tables for discharging material from the cooling zone into the Outlet funnel.
  • the cooling gas is preferably blown into the cooling zone of the shaft furnace via a cooling gas inlet.
  • the cooling gas inlet is preferably arranged in the cooling zone, in particular below the turntable.
  • a plurality of burners, in particular burner lances, are preferably arranged in the combustion zone of the shaft. It is also conceivable that the shaft has a plurality of side burners which extend through the shaft wall into the combustion zone.
  • the side burners are preferably designed as burner lances and in particular tubular. They serve to conduct fuel and preferably an oxidizing agent, which is introduced into the combustion zone together with exhaust gas.
  • the closure device preferably extends over the entire cross section of the channel. The gas-technical closure of the channel using a closure device enables the two shafts of the lime kiln system to be operated separately. For further embodiments, reference is made to DE 10 2021 204 175.
  • the shaft furnace is designed for operation with a gas of at least 50% oxygen.
  • the screening device is designed for a separation of between 5 mm and 50 mm.
  • the sieve device is therefore chosen so that the sieve hole size is between 5 mm and 50 mm. This means that the fine fraction is below the selected value and the coarse fraction is above the selected value.
  • the shaft furnace is designed for operation with a gas of at least 90% oxygen.
  • the exhaust gas stream from the combustion and the CO2 emerging from the lime (after separation of water) would be pure carbon dioxide, which can then be easily reused or stored. Since only one additional shaft kiln has to be installed when retrofitting an existing cement plant, this can be designed to work with highly enriched oxygen without having to convert the existing components such as preheater, calciner and kiln Need to become.
  • the use of enriched oxygen greatly simplifies the CCh separation.
  • a CO2 separation device is connected downstream of the shaft furnace. This can be carried out particularly easily if the shaft furnace is designed for operation with a gas of at least 50% oxygen, preferably at least 90% oxygen. Separation of water is usually always necessary.
  • the CCh separation device can be preceded by a dust separator or other usual pretreatments.
  • the system has two shaft furnaces.
  • the shaft furnaces are designed according to DE 10 2021 204 175 and are operated alternately. Such an arrangement is called a direct current regenerative lime shaft kiln.
  • the invention relates to a method for producing cement clinker.
  • a system according to the invention is preferably used for the method according to the invention.
  • the process has the following steps: a) sieving the raw material into a coarse fraction and a fine fraction, b) thermally treating the coarse fraction in a shaft furnace with a gas of at least 50% oxygen, c) mixing the fine fraction and the thermally treated coarse fraction and then Grinding or grinding the fine fraction and grinding the thermally treated coarse fraction and then mixing, d) preheating the material, e) calcining the material, f) firing the material in a furnace, g) cooling the product.
  • step a) the coarse fraction is separated off.
  • an oversized fraction can also be separated, for example for particles with a size of more than 100 to 200 mm.
  • the starting material is broken in a crusher, in this case the oversized one is preferred Fraction returned to the crusher. This prevents particles that are too large from being contained in the coarse fraction.
  • a significantly coarser fraction can be thermally treated.
  • the coarser fraction particularly contains calcium carbonate. Therefore, a simple thermal treatment and thus a separation of the CO2 produced in this step is possible, whereby the further system can be operated unchanged according to the state of the art.
  • the grindability of the material also increases, which in turn reduces the energy consumption, especially for the largest particles, and thus further increases the overall efficiency of the process.
  • step c) there are two options.
  • the fine fraction and the thermally treated coarse fraction are first mixed and then ground together.
  • the two fractions are ground separately and then mixed. It is important that at the end the fractions are mixed again and fed into the cement clinker process in steps d) to g).
  • step e An important point here is that less energy is required during calcination in step e) because part (the coarse fraction) has already been decarbonized. Therefore, less energy and therefore less fuel is required in the calciner and therefore less CO2 is produced, which is then released into the environment according to the state of the art. Thus, part of the CO2 originating from the fuel is generated in the shaft furnace by the method according to the invention and is therefore separated.
  • the sieving in step a) takes place to a size of 5 to 50 mm, for example to 30 mm. This results in a good size distribution of the starting material for the shaft furnace using common raw materials. At the same time, it is possible to transfer 20 to 40% of the resulting CO2 into the shaft furnace, so that this CO2 can be easily separated without having to adapt the other system, in particular the furnace and calciner. It is therefore comparatively easy and quick to avoid a relevant proportion of CO2 emissions.
  • the raw material is broken before sieving in step a).
  • the thermal treatment in step b) takes place in two shafts of a GGR shaft furnace in alternating order.
  • two shaft furnaces reference is made, for example, and in particular to DE 10 2021 204 175.
  • the coarse fraction after treatment in the shaft furnace has a carbon dioxide content of between one and eight percent by mass, preferably between three and five percent by mass.
  • the carbon dioxide is in the form of carbonate, i.e. chemically bound. This means that the coarse fraction releases this carbon dioxide from the carbonate during further treatment in the calciner and oven.
  • this range enables the greatest possible Co2 separation, and on the other hand, the residual content leads to an improved product after the actual treatment.
  • FIG. 1 Schematic of a system
  • the starting raw material for the production of cement clinker is provided in a raw material supply 10. This contains, for example, calcium carbonate in particular.
  • the raw material is broken in an optional crusher 20 and sieved in a screening device 30.
  • the coarse fraction for example everything over 20 mm, is fed to a shaft furnace 40 and thermally treated.
  • the fine fraction from the screening device 30 and the thermally treated material from the shaft furnace 40 are fed together to a mill 50 and ground together and mixed intimately.
  • the product ground in the mill 50 is deacidified in a preheater 60 and deacidified in the calciner 70 finally fired in the oven 80, in particular a rotary kiln.
  • the finished burned cement clinker is cooled in the material cooler 90.

Abstract

L'invention concerne une installation de production de clinker de ciment, cette installation comprenant un dispositif de fourniture de matière première (10), un broyeur (50), un préchauffeur (60), un calcinateur (70), un four (80) et un refroidisseur de matériau (90), le flux de matière étant acheminé depuis le dispositif de fourniture de matière première (10) via le broyeur (50), le préchauffeur (60), le calcinateur (70), le four (80) et le refroidisseur de matériau (90), ce refroidisseur de matériau (90) comportant une sortie de produit. L'invention est caractérisée en ce que l'installation comporte un dispositif de tamisage (30), ce dispositif de tamisage (30) étant relié au dispositif de fourniture de matière première (10) pour l'alimentation en matière première, le dispositif de tamisage (30) étant conçu pour séparer un flux de particules grossières et un flux de particules fines, l'installation comportant un four à cuve (40), le dispositif de tamisage (30) étant relié à ce four à cuve (40) pour le transfert du flux de particules grossières, ledit four à cuve (40) étant relié au broyeur (50) pour le transfert de la matière première traitée thermiquement.
PCT/EP2023/073055 2022-08-30 2023-08-22 Réduction des émissions de co2 lors de la production de clinker de ciment WO2024046818A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BEBE2022/5684 2022-08-30
BE20225684A BE1030823B1 (de) 2022-08-30 2022-08-30 Reduktion von CO2-Emissionen bei der Herstellung von Zementklinker
DE102022208981.2 2022-08-30
DE102022208981.2A DE102022208981A1 (de) 2022-08-30 2022-08-30 Reduktion von CO2-Emissionen bei der Herstellung von Zementklinker

Publications (1)

Publication Number Publication Date
WO2024046818A1 true WO2024046818A1 (fr) 2024-03-07

Family

ID=87848122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/073055 WO2024046818A1 (fr) 2022-08-30 2023-08-22 Réduction des émissions de co2 lors de la production de clinker de ciment

Country Status (1)

Country Link
WO (1) WO2024046818A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845495A1 (de) 1997-10-03 1999-08-12 Stingel Egon Verfahren zum Brennen von carbonhaltigem Gestein unter Erzeugung eines Abgasstroms mit hohem CO2-Gehalt,sowie Doppelschachtofen zur Durchführung der Verfahren
DE19929066A1 (de) 1999-06-25 2000-12-28 Kloeckner Humboldt Wedag Anlage zur Herstellung von Zementklinker
WO2007099415A1 (fr) 2006-02-28 2007-09-07 Flsmidth A/S Procede et installation de sechage et de concassage de matieres premieres minerales humides
EP2018353B1 (fr) 2006-05-10 2009-10-21 FLSmidth A/S Procédé et équipement de fabrication de clinker de ciment
DE102008059370A1 (de) 2008-11-28 2010-06-02 Polysius Ag Verfahren und Anlage zur Herstellung von Zement
WO2011072894A1 (fr) 2009-12-15 2011-06-23 Maerz Ofenbau Ag Four à chaux régénérateur à équicourant - contre-courant et procédé pour faire fonctionner le four
DE112010004030B4 (de) 2009-07-02 2018-11-29 SINOCALCI Technology Corp. Vertikaler Brennofen mit drei konzentrischen Zylindern
DE102018206674A1 (de) 2018-04-30 2019-10-31 Thyssenkrupp Ag Oxyfuel-Klinkerherstellung ohne Rezirkulation der Vorwärmerabgase
DE102018206673A1 (de) 2018-04-30 2019-10-31 Thyssenkrupp Ag Oxyfuel-Klinkerherstellung mit spezieller Sauerstoffzugasung
DE102021202485A1 (de) 2021-03-15 2022-09-15 Maerz Ofenbau Ag Schachtofen und Verfahren zum Brennen von karbonathaltigem Material in einem Schachtofen
DE102021204175A1 (de) 2021-04-27 2022-10-27 Maerz Ofenbau Ag Kalkofensystem zum Brennen von Karbonatgestein und Verfahren zum Umbau eines GGR-Schachtofens in ein Kalkofensystem mit einem Schachtofen

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845495A1 (de) 1997-10-03 1999-08-12 Stingel Egon Verfahren zum Brennen von carbonhaltigem Gestein unter Erzeugung eines Abgasstroms mit hohem CO2-Gehalt,sowie Doppelschachtofen zur Durchführung der Verfahren
DE19929066A1 (de) 1999-06-25 2000-12-28 Kloeckner Humboldt Wedag Anlage zur Herstellung von Zementklinker
WO2007099415A1 (fr) 2006-02-28 2007-09-07 Flsmidth A/S Procede et installation de sechage et de concassage de matieres premieres minerales humides
EP2018353B1 (fr) 2006-05-10 2009-10-21 FLSmidth A/S Procédé et équipement de fabrication de clinker de ciment
DE102008059370A1 (de) 2008-11-28 2010-06-02 Polysius Ag Verfahren und Anlage zur Herstellung von Zement
DE112010004030B4 (de) 2009-07-02 2018-11-29 SINOCALCI Technology Corp. Vertikaler Brennofen mit drei konzentrischen Zylindern
WO2011072894A1 (fr) 2009-12-15 2011-06-23 Maerz Ofenbau Ag Four à chaux régénérateur à équicourant - contre-courant et procédé pour faire fonctionner le four
DE102018206674A1 (de) 2018-04-30 2019-10-31 Thyssenkrupp Ag Oxyfuel-Klinkerherstellung ohne Rezirkulation der Vorwärmerabgase
DE102018206673A1 (de) 2018-04-30 2019-10-31 Thyssenkrupp Ag Oxyfuel-Klinkerherstellung mit spezieller Sauerstoffzugasung
DE102021202485A1 (de) 2021-03-15 2022-09-15 Maerz Ofenbau Ag Schachtofen und Verfahren zum Brennen von karbonathaltigem Material in einem Schachtofen
DE102021204175A1 (de) 2021-04-27 2022-10-27 Maerz Ofenbau Ag Kalkofensystem zum Brennen von Karbonatgestein und Verfahren zum Umbau eines GGR-Schachtofens in ein Kalkofensystem mit einem Schachtofen

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