WO2021246319A1 - Procédé de production de ciment et système de production de ciment - Google Patents

Procédé de production de ciment et système de production de ciment Download PDF

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Publication number
WO2021246319A1
WO2021246319A1 PCT/JP2021/020407 JP2021020407W WO2021246319A1 WO 2021246319 A1 WO2021246319 A1 WO 2021246319A1 JP 2021020407 W JP2021020407 W JP 2021020407W WO 2021246319 A1 WO2021246319 A1 WO 2021246319A1
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WIPO (PCT)
Prior art keywords
cement
exhaust gas
methane
cement manufacturing
fuel
Prior art date
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PCT/JP2021/020407
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English (en)
Japanese (ja)
Inventor
佳典 ▲高▼山
始 川崎
琢磨 高馬
卓哉 小松
Original Assignee
三菱マテリアル株式会社
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 JP2020097645A external-priority patent/JP2021187721A/ja
Priority claimed from JP2020097644A external-priority patent/JP7215462B2/ja
Priority claimed from JP2020105722A external-priority patent/JP7374856B2/ja
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Publication of WO2021246319A1 publication Critical patent/WO2021246319A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B61/00—Other general methods
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/02—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon
    • C07C1/12—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon from carbon dioxide with hydrogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C9/00—Aliphatic saturated hydrocarbons
    • C07C9/02—Aliphatic saturated hydrocarbons with one to four carbon atoms
    • C07C9/04—Methane
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/08—Production of synthetic natural gas
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/18—Carbon capture and storage [CCS]

Definitions

  • the present invention relates to a cement manufacturing method and a cement manufacturing system for manufacturing cement while reducing the CO 2 and removing harmful components by utilizing CO 2 originating from energy contained in the exhaust gas of a cement manufacturing facility.
  • coal, petroleum coke, and heavy oil used as fossil fuels contain harmful components such as NOx (generally called fuel NOx) and SOx derived from nitrogen and sulfur contained therein, and the exhaust gas contained therein. Processing requires a great deal of cost.
  • NOx generally called fuel NOx
  • SOx SOx derived from nitrogen and sulfur contained therein
  • the methanation method described in Patent Document 1 is conventionally known. That is, it is a method of obtaining methane by separating carbon dioxide contained in combustion exhaust gas and reacting it with hydrogen. In this methanation method, a step of bringing the combustion exhaust gas into contact with a carbon dioxide absorber to absorb carbon dioxide in the combustion exhaust gas, and a gas containing carbon dioxide as a main component by heating the carbon dioxide absorber that has absorbed carbon dioxide.
  • Patent Document 1 can reduce harmful components by methanizing the discharged combustion gas.
  • methane produced from fossil fuel-derived combustion gas is burned, it will be released as CO 2 again, so it is good to reduce and utilize energy-derived CO 2 to remove harmful components. It's hard.
  • the present invention has been made in view of such circumstances, and by converting CO 2 in cement exhaust gas that is not derived from fossil fuels into methane and effectively utilizing it, cement can be produced while reducing CO 2 and removing harmful components. It is an object of the present invention to provide a cement manufacturing method and a cement manufacturing system that can be manufactured.
  • hydrogen is added to CO 2 in the exhaust gas from the cement manufacturing facility or CO 2 separated and recovered from the exhaust gas to generate methane, and the methane is transferred to the calcining furnace of the cement manufacturing facility. It is supplied as a substitute fuel for a part or all of the fossil fuel of the above, and the cement raw material is calcined by the calcining furnace, and the calcined raw material is calcined by the cement firing kiln of the cement manufacturing facility. To manufacture.
  • the exhaust gas from the cement manufacturing equipment contains NOx (nitrogen oxide) and SOx (sulfur oxide).
  • the temperature inside the furnace becomes 800 ° C to 900 ° C due to the combustion of fossil fuel (for example, coal). Therefore, the NOx in the exhaust gas discharged from the calcination furnace is mainly NOx originating from the fuel. Such NOx is called fuel NOx.
  • the NOx generated at a high temperature of 1000 ° C. or higher (for example, about 1450 ° C.) is derived from nitrogen in the air. It is NOx of thermal origin generated by. Such NOx is called thermal NOx.
  • SOx is derived from the sulfur component in fossil fuels such as coal and petroleum used in cement manufacturing facilities. Therefore, by supplying the methane generated from the exhaust gas to the calcining furnace of the cement manufacturing facility, it is possible to reduce the SOx derived from the fuel from the cement manufacturing facility.
  • the CO 2 may be CO 2 separated and recovered by bringing the exhaust gas from the cement manufacturing facility into contact with the CO 2 absorber.
  • the concentration thereof can be increased to produce high-concentration methane, and methane can be used more effectively.
  • the cement manufacturing system of the present invention comprises a cement manufacturing facility having a calcining furnace for calcining a cement raw material and a cement firing kiln for calcining the calcined raw material to produce a cement cleaner.
  • a methanation unit for generating methane by adding hydrogen to CO 2 separated recovered from CO 2 or exhaust gas in the exhaust gas from a portion of fossil fuels the methane to the calciner of the cement manufacturing facility Alternatively, it is provided with a methane supply device that supplies all the alternative fuels.
  • the methaneization apparatus may directly add the hydrogen to the exhaust gas to generate the methane.
  • methane generated from the exhaust gas of the cement manufacturing facility is used as an alternative fuel for the fossil fuel of the calciner in the cement manufacturing facility, methane is effectively utilized to reduce CO 2 originating from energy. Therefore, it is possible to enhance the effect of reducing greenhouse gases and to produce cement while reducing fuel NOx and SOx originating from fuel.
  • the cement manufacturing system 100 includes a cement manufacturing facility 50 and an exhaust gas treatment facility 30 connected to and used in the cement manufacturing facility 50.
  • the exhaust gas treatment facility 30 adds hydrogen to the exhaust gas from the cement manufacturing facility 50 or CO 2 separated and recovered from the exhaust gas to generate methane, and the generated methane is used as the calcination furnace 4 of the cement manufacturing facility 50.
  • the generated methane is used as the calcination furnace 4 of the cement manufacturing facility 50.
  • the cement manufacturing facility 50 includes a raw material storage 1 for individually storing limestone, clay, silica stone, iron raw materials, etc. as cement raw materials, and a raw material mill and dryer for crushing and drying these cement raw materials. 2 and a preheater 3 that preheats the powdered cement raw material supplied through the raw material supply pipe 22 and obtained by this raw material mill, and a calcining furnace 4 that calcins the cement raw material preheated by the preheater 3.
  • a cement calcined kiln 5 for calcining a calcined cement raw material
  • a cooler 6 for cooling a cement clinker after being calcined by the cement calcined kiln 5, and the like.
  • the cement firing kiln 5 is a cylindrical rotary kiln that is slightly inclined sideways, and by rotating around the axis, the cement raw material supplied from the preheater 3 is sent to the kiln front portion 5b to the kiln tail portion 5a while being sent to the kiln front portion 5b.
  • the burner 8 of the front part 5b of the kiln heats and fires at about 1450 ° C. to form a cement clinker.
  • the generated cement clinker is sent from the kiln front portion 5b to the cooler 6.
  • a fuel supply line 15 for supplying fuel including fossil fuels such as coal and petroleum is connected to the burner 8.
  • a supply system (not shown) for an alternative heat source such as waste plastic or waste tire is also provided to supplement the heat energy.
  • the cement clinker is cooled to a predetermined temperature by the cooler 6 and then sent to the finishing process.
  • the preheater 3 is constructed in which a plurality of cyclones 13 (four in the example shown in FIG. 2) that circulate the exhaust gas generated in the cement firing kiln 5 are connected in the vertical direction.
  • a calciner 4 is connected between the cyclone 13 at the bottom and the cyclone 13 above it.
  • the cement raw material calcined by the combustion gas of the calcining furnace 4 is supplied from the lowermost cyclone 13 to the kiln tail portion 5a of the cement calcined kiln 5.
  • the calcining furnace 4 has a burner 41 inside, and is sent from the upper cyclone 13 by burning fuel such as coal supplied from the fuel supply line 42 at a temperature of 800 ° C to 900 ° C.
  • fuel such as coal supplied from the fuel supply line 42 at a temperature of 800 ° C to 900 ° C.
  • the coming cement raw material is calcined, and the calcined cement raw material is supplied to the lowermost cyclone 13 through the rising duct 25 together with the exhaust gas generated by the calcining.
  • the cement raw material is supplied from the lowermost cyclone 13 to the kiln tail portion 5a of the cement firing kiln 5.
  • the rising duct 25 sends the exhaust gas from the kiln tail portion 5a of the cement firing kiln 5 to the lowermost cyclone 13, and the exhaust gas generated in the calcining furnace 4 is also supplied to the cyclone 13 through the rising duct 25. Ru. Therefore, the exhaust gas from the cement firing kiln 5 and the exhaust gas from the calcining furnace 4 are integrated and passed through the preheater 3 from the lower side to the upper side, and then introduced into the raw material mill and the dryer 2 through the exhaust pipe 9.
  • the raw material mill and the dryer 2 are adapted to simultaneously crush and dry the cement raw material by introducing the exhaust gas from the cement firing kiln 5.
  • An exhaust gas treatment line 12 including a dust collector 10, a chimney 11, and the like is connected to the raw material mill and the dryer 2.
  • the exhaust gas treatment facility 30 includes an exhaust gas collection line 311 that collects exhaust gas generated in the cement firing kiln 5 and the calcination furnace 4 and before being discharged from the chimney 11, and CO from the exhaust gas sent from the exhaust gas collection line 311. It is provided with a methaneization device 31 that separates and recovers 2 and adds hydrogen to the separated and recovered CO 2 to generate methane, and a methane supply device 32 that supplies the generated methane to the cement production facility 50.
  • the exhaust gas collection line 311 is connected between the dust collector 10 and the chimney 11 in the exhaust gas treatment line 12 of the cement manufacturing facility 50, and collects a part of the exhaust gas generated during cement firing. Since it is an exhaust gas generated by cement firing, it includes some exhaust gas from combustion of fuel such as coal, but it also contains a large amount of exhaust gas derived from limestone.
  • Methanation apparatus 31 includes a CO 2 separation and recovery device 310 for separating and recovering CO 2 from flue gas, hydrogen mixed for mixing by supplying hydrogen (e.g. hydrogen gas) in the CO 2 separated recovered by CO 2 separation and recovery device 310 It includes a unit 316 and a methane production unit 317 that produces methane from CO 2 mixed with hydrogen.
  • hydrogen e.g. hydrogen gas
  • the CO 2 separation and recovery device 310 has a harmful component removing unit 312 that removes harmful components such as SOx and NOx from the exhaust gas collected by the exhaust gas collection line 311 and the exhaust gas from which the harmful components have been removed.
  • a CO 2 separation collector 313 for separating and recovering CO 2 includes a compression unit 314 for compressing the recovered CO 2, and dehumidifying unit 315 for removing moisture from the compressed CO 2, the.
  • the exhaust gas sent from the exhaust gas collection line 311 may include not only the combustion exhaust gas of fossil fuels such as coal, petroleum coke, and heavy oil, but also the combustion exhaust gas such as waste plastics and waste tires.
  • CO 2 for example, as would fall about 20 several percent, it is included gas and harmful components other than CO 2.
  • NOx nitrogen oxide
  • SOx sulfur oxide
  • the temperature inside the mortar is 800 ° C to 900 ° C due to the combustion of fossil fuel (for example, coal), so the NOx in the exhaust gas discharged from the calcination furnace is mainly fuel NOx derived from fuel. be.
  • the temperature is high at 1000 ° C. or higher (for example, about 1450 ° C.), so that nitrogen in the air is the source. It is a thermal NOx of thermal origin generated by the above. That is, the exhaust gas contains two types of NOx, fuel NOx originating from fuel and thermal NOx originating from heat.
  • the harmful component removing unit 312 removes harmful components (SOx as described above, and oxidizing gases such as fuel NOx originating from fuel and thermal NOx originating from heat) from the exhaust gas, and is filled with an aqueous NaOH solution or the like. Equipped with a scrubber. By removing this harmful component, halogen is also removed together with NOx, so that deterioration of the absorbent material of the amine compound used in the next CO 2 separation and recovery is prevented.
  • harmful components SOx as described above, and oxidizing gases such as fuel NOx originating from fuel and thermal NOx originating from heat
  • CO 2 separation collector 313 is made common CO 2 recovery apparatus, the inside absorbs CO 2 CO 2 absorbent (amine compound liquid absorbing material dissolved in water, the amine compound to the porous material A supported solid absorbent or the like) is provided, and the exhaust gas after the harmful components are removed comes into contact with the solid absorbent, so that CO 2 in the exhaust gas is absorbed by the CO 2 absorbent. Then, such as by heating the CO 2 absorbing material that has absorbed CO 2, is recovered by extraction of CO 2 from the CO 2 absorber.
  • the CO 2 separation / recovery unit 313 discharges the exhaust gas after CO 2 has been removed to the outside.
  • the compression unit 314 compresses the recovered CO 2 by applying a pressure of 0.1 MPa or more, preferably 0.5 to 1.0 MPa.
  • Dehumidifying unit 315 by cooling the compressed CO 2, removing the moisture contained in the CO 2. This dehumidification is performed to remove the moisture before the methanation because it affects the oxidation of the Ni-based catalyst in the methanation apparatus.
  • the hydrogen mixing unit 316 supplies hydrogen to the dehumidified CO 2 to mix and pressurize it.
  • Hydrogen can be produced by artificial photosynthesis using renewable energy, decomposition of water, or the like.
  • the amount of hydrogen added by the hydrogen mixing unit 316 is appropriately set so as to have a concentration at which methane can be easily produced from CO 2 mixed with hydrogen.
  • the methane production unit 317 produces methane from CO 2 mixed with hydrogen.
  • the methane production unit 317 is composed of a general methane production apparatus, and includes a plurality of reactors (not shown) filled with catalysts that are active in methaneization, and CO 2 in which hydrogen is mixed in these reactors.
  • Methane is produced by supplying and reacting.
  • Ni, Pt, Pd, and Cu are used as the hydrogenation catalyst, but in the methanation catalyst, in particular, Al 2 O 3 , Cr 2 O 3 , SiO 2 , Mg Al 2 O 4 , TiO 2 , and so on.
  • Supported Ni and Ni alloys such as ZrO 2 are used.
  • the methane supply device 32 is connected to a tank 322 that compresses and stores methane produced by the methaneization device 31 by a pump 321 and a tank 322, and stores methane in a burner 8 of the kiln front portion 5b.
  • a methane supply line 323 for sending to each of the burners 41 of the calcination furnace 4.
  • the methane supply line 323 is a fuel supply line 15 that supplies fuel such as coal or petroleum to the burner 8 of the cement firing kiln 5, and a fuel supply line 42 that supplies fuel such as coal to the burner 41 of the calcination furnace 4. It is connected to the. As a result, methane is supplied to each of the burners 8 and 41 together with the fuel.
  • FIG. 1 shows a method of manufacturing cement while reducing CO 2 and removing harmful components by methaneizing CO 2 in the exhaust gas of the cement manufacturing facility 50 using the cement manufacturing system 100 described above and effectively utilizing it. The explanation will be given according to the flowchart.
  • a powdery cement raw material obtained by crushing and drying limestone, clay, silica stone, iron raw material, etc. as a cement raw material is preheated, and the preheated cement raw material is calcined and then fired. Then, by cooling this, a cement clinker is manufactured.
  • the exhaust gas generated in the cement firing kiln 5 accompanying the production of this cement clinker is introduced into the raw material mill and the dryer 2 through the exhaust pipe 9 after passing through the preheater 3 from the lower side to the upper side, and is used for drying the cement raw material. After that, it is discharged from the chimney 11 via the dust collector 10.
  • the harmful component removing unit 312 removes the harmful component from the exhaust gas. Nitrogen oxides (NOx), sulfur oxides (SOx), halogens and the like are removed in the harmful component removing unit 312. Then, the CO 2 separation and recovery unit 313 extracts CO 2 from the exhaust gas and separates and recovers it. At this time, the exhaust gas from which CO 2 has been removed is discharged to the outside.
  • the recovered CO 2 is compressed by applying a pressure of 0.1 MPa or more, preferably 0.5 to 1.0 MPa by the compression unit 314, and the water contained in the CO 2 is removed by the dehumidifying unit 315.
  • hydrogen is supplied to the dehumidified CO 2 by the hydrogen mixing unit 316, mixed, and pressurized.
  • the methane production unit 317 produces methane from CO 2 mixed with hydrogen.
  • the methane produced in this way is stored in the tank 322 of the methane supply device 32. Then, the methane stored in the tank 322 is supplied to the cement firing kiln 5 and the calcining furnace 4 via the methane supply line 323.
  • Fossil fuels such as oil and coal are supplied to the cement fired kiln 5 from the fuel supply line 15. By supplying methane, a part of the fossil fuel can be replaced with methane. Fossil fuels can be reduced. Similarly, in the calcination furnace 4, fossil fuels can be reduced because part or all of the fuel such as coal is replaced with methane.
  • the calcination furnace 4 is supplied with methane to supply methane from the calcination furnace 4. NOx in the discharged exhaust gas can be reduced. Since SOx is generated by combustion of fossil fuel, it can be reduced by substituting methane for fossil fuel of cement firing kiln 5 and calcination furnace 4.
  • the methane cement kiln 5 and the temporary Methane can be effectively utilized by using it as an alternative fuel for the incinerator 4.
  • fossil fuels such as coal and petroleum, which are a major cause of global warming, are replaced with methane derived from limestone, the use of fossil fuels can be reduced, CO 2 originating from energy can be reduced, and greenhouse gases can be reduced. The effect can be enhanced.
  • the calcination furnace 4 is supplied with methane to supply methane from the calcination furnace 4. NOx (harmful components) originating from fuel in the exhaust gas can be reduced. Further, since SOx is derived from the sulfur component in the fossil fuel used in the cement manufacturing facility 50, the SOx derived from the fuel from the cement manufacturing facility 50 can be reduced by supplying methane to the cement manufacturing facility 50. ..
  • the concentration thereof can be increased to produce high-concentration methane, and methane can be used more effectively.
  • methane is generated from CO 2 separated and recovered from the exhaust gas in this way, and the methane is used as an alternative fuel for the cement firing kiln 5 and the calcining furnace 4, thereby reducing the use of fossil fuels and CO of energy origin. 2 can be reduced. Further, it is possible to produce a cement clinker by firing the calcined cement raw material with the cement calcining kiln 5 while removing harmful components originating from the fuel generated by the combustion of the fossil fuel in the calcining furnace 4.
  • CO 2 is separated and recovered from the exhaust gas of the cement manufacturing equipment 50, but since the exhaust gas of the cement manufacturing equipment 50 contains CO 2 at a concentration of 20% or more, hydrogen is directly added to the exhaust gas. May produce methane.
  • the generated methane is supplied to both the cement firing kiln 5 and the calcining furnace 4, it may be supplied only to the calcining furnace 4.
  • Methane generated from exhaust gas from cement manufacturing equipment is used as an alternative fuel for fossil fuels in calcination furnaces in cement manufacturing equipment, effectively utilizing methane , reducing CO 2 originating from energy, and reducing greenhouse gases. It is possible to produce cement while reducing fuel NOx and SOx originating from fuel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Treating Waste Gases (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

De l'hydrogène est ajouté à du CO2 qui est contenu dans des gaz de fumées provenant d'une installation de production de ciment ou du CO2 qui a été séparé et collecté à partir des gaz de fumées pour produire du méthane, le méthane est fourni en tant que combustible alternatif pour une partie ou l'ensemble d'un combustible fossile qui doit être fourni à un précalcinateur dans l'installation de production de ciment pour pré-calciner une matière première de ciment au moyen du précalcinateur, et la matière première de ciment précalcinée est calcinée au moyen d'un four de calcination de ciment dans l'installation de production de ciment en vue de produire une scorie de ciment. De cette manière, du CO2 dans des gaz de fumées de ciment qui n'est pas dérivé du combustible fossile peut être méthanisé et peut ainsi être utilisé efficacement, et il devient possible de produire un ciment tout en réduisant le CO2 et en éliminant un constituant nocif.
PCT/JP2021/020407 2020-06-04 2021-05-28 Procédé de production de ciment et système de production de ciment WO2021246319A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2020-097645 2020-06-04
JP2020097645A JP2021187721A (ja) 2020-06-04 2020-06-04 セメント製造排ガス中のｃｏ２活用方法及びｃｏ２活用システム
JP2020097644A JP7215462B2 (ja) 2020-06-04 2020-06-04 セメント製造排ガス中のｃｏ２活用方法及びｃｏ２活用システム
JP2020-097644 2020-06-04
JP2020-105722 2020-06-19
JP2020105722A JP7374856B2 (ja) 2020-06-19 2020-06-19 セメント製造方法及びセメント製造システム

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Citations (3)

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