WO2021246315A1 - Procédé et système d'utilisation de co2 dans un gaz de fumées de production de ciment - Google Patents

Procédé et système d'utilisation de co2 dans un gaz de fumées de production de ciment Download PDF

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WO2021246315A1
WO2021246315A1 PCT/JP2021/020403 JP2021020403W WO2021246315A1 WO 2021246315 A1 WO2021246315 A1 WO 2021246315A1 JP 2021020403 W JP2021020403 W JP 2021020403W WO 2021246315 A1 WO2021246315 A1 WO 2021246315A1
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methane
exhaust gas
cement
cement manufacturing
facility
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PCT/JP2021/020403
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English (en)
Japanese (ja)
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佳典 ▲高▼山
始 川崎
琢磨 高馬
卓哉 小松
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三菱マテリアル株式会社
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Priority claimed from JP2020097645A external-priority patent/JP2021187721A/ja
Priority claimed from JP2020097644A external-priority patent/JP7215462B2/ja
Priority claimed from JP2020098264A external-priority patent/JP2021191731A/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 WO2021246315A1 publication Critical patent/WO2021246315A1/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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • 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
    • B01D53/68—Halogens or halogen compounds
    • 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 method for utilizing CO 2 originating from energy contained in the exhaust gas of a cement manufacturing facility while reducing it, and a CO 2 utilization system.
  • 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 The method described in Patent Document 1 can be effectively used by methanizing the discharged combustion gas. However, if methane produced from fossil fuel-derived combustion gas is burned, it will be released as CO 2 again, so it cannot be said that the amount of energy-derived CO 2 is reduced.
  • the present invention has been made in view of such circumstances, and is used in cement manufacturing exhaust gas, which can reduce CO 2 derived from energy by methaneizing CO 2 in cement exhaust gas that is not derived from fossil fuels and effectively utilizing it.
  • the purpose is to provide a CO 2 utilization method and a CO 2 utilization system.
  • the CO 2 utilization method in the cement production exhaust gas of the present invention comprises a methane production step of adding hydrogen to CO 2 in the exhaust gas from the cement production facility or CO 2 separated and recovered from the exhaust gas to generate methane, and the methane.
  • the methane production step is provided with a methane consumption step in which the methane produced in the production step is used as a substitute fuel for a part or all of the fossil fuel for the cement production facility, and the methane production step and the methane consumption step are continuously repeated.
  • the methane cement production facility CO 2 can be effectively utilized by circulating it as an alternative fuel for CO2, that is, by using it continuously and repeatedly.
  • CO2 since more than half of CO 2 in the exhaust gas from cement production equipment is derived from limestone, coal can be produced by continuously repeating the production of methane from the CO 2 in the exhaust gas and using it as fuel. It is possible to reduce the use of fossil fuels such as petroleum, reduce CO 2 originating from energy, and enhance the effect of reducing greenhouse gases.
  • the methane consumption step can use the methane as an alternative fuel for at least one of the cement firing kiln and the calcining furnace in the cement manufacturing facility.
  • the methane is burned in the cement manufacturing facility to the CO 2 in the exhaust gas used for producing the methane or the CO 2 separated and recovered from the exhaust gas.
  • the generated CO 2 will also be included.
  • the exhaust gas generated by burning methane in the cement manufacturing facility has a low content of nitrogen oxides (NOx) and sulfur oxides (SOx), and the exhaust gas can be made cleaner.
  • the CO 2 is the exhaust gas from the cement manufacturing facility may be brought into contact with the CO 2 absorbing material is separated recovered CO 2.
  • the CO 2 utilization system in the cement manufacturing exhaust gas of the present invention is a methane that produces methane by adding hydrogen to the CO 2 in the exhaust gas from the cement manufacturing facility or CO 2 separated and recovered from the exhaust gas to the cement manufacturing facility.
  • the methaneization device includes a methane supply device that supplies the methane produced by the methaneization device as an alternative fuel for a part or all of the fossil fuel to the cement production facility, and the methaneization device is the methane supply device. It is connected to the cement manufacturing facility to which methane is supplied by.
  • the methane supply device may be connected to at least one of the fuel supply lines of the cement firing kiln or the calcining furnace in the cement manufacturing facility.
  • the methanization apparatus may directly add the hydrogen to the exhaust gas to generate the methane.
  • CO 2 since methane is continuously produced from CO 2 contained in the exhaust gas of a cement manufacturing facility and used as a fuel, CO 2 is effectively utilized to generate CO 2 originating from energy. It can be reduced and the greenhouse gas reduction effect can be enhanced.
  • This embodiment is an example of continuously repeating the production of methane from CO 2 in the cement production exhaust gas and using it as fuel for a cement firing kiln and a calcining furnace of a cement manufacturing facility.
  • the CO 2 utilization 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 exhaust gas or CO 2 separated and recovered from the exhaust gas to generate methane, and the generated methane is used as fossil fuel for the cement production facility 50. Supplied as an alternative fuel in part or in whole.
  • 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 by burning fuel such as coal supplied from the fuel supply line 42, the cement raw material sent from the upper cyclone 13 is calcined.
  • the calcined cement raw material is supplied to the lowermost cyclone 13 via the rising duct 25 together with the exhaust gas generated by the calcined.
  • 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.
  • 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 crush and dry the cement raw material at the same time by introducing the exhaust gas from the calcining furnace 4 and 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 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. Therefore, the harmful component removing unit 312 removes harmful components (for example, oxidizing gases such as nitrogen oxides (NOx) and sulfur oxides (SOx)) from the exhaust gas, and is a scrubber filled with an aqueous NaOH solution. To prepare for. 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 for example, oxidizing gases such as nitrogen oxides (NOx) and sulfur oxides (SOx)
  • 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 and 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. Connected to each. As a result, methane is supplied to each of the burners 8 and 41 together with the fuel.
  • the methane supply device 32 is connected to the methaneization device 31 as shown in FIG. Methane is supplied to the cement firing kiln 5 and the calcining furnace 4.
  • the exhaust gas sent to the methane conversion device 31 is the exhaust gas from the cement firing kiln 5 and the calcining furnace 4 to which methane is supplied by the methane supply device 32.
  • 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.
  • Exhaust gas generated in the cement firing kiln 5 and the calcining furnace 4 due to 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 as a cement raw material. After being used for drying, 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 thus produced is stored in the tank 322 of the methane supply device 32. Then, the methane stored in the tank 322 is supplied as a substitute fuel for a part or all of the fossil fuel to the cement firing kiln 5 and the calcining furnace 4 via the methane supply line 321.
  • Fossil fuels such as petroleum and coal are supplied to the cement fired kiln 5 from the fuel supply line 15, and by supplying methane, part or all of the fossil fuel can be replaced with methane.
  • fossil fuels can be reduced because part or all of the fuel such as coal is replaced with methane.
  • the exhaust gas generated by the combustion of the methane together with the fossil fuel will be included in the exhaust gas.
  • the exhaust gas is sent to the methane conversion device 31 via the exhaust gas collection line 311 and similarly generated as methane and supplied to the cement firing kiln 5 and the calcining furnace 4.
  • the methane cement kiln 5 and the temporary CO 2 can be effectively utilized by circulating it as an alternative fuel for the incinerator 4, that is, by using it repeatedly.
  • methane from the CO 2 in the exhaust gas is continuously produced and used as fuel, so that coal or coal can be used. It is possible to reduce the use of fossil fuels such as petroleum, reduce CO 2 originating from energy, and enhance the effect of reducing greenhouse gases.
  • the CO 2 of the exhaust gas generated by burning methane together with the fossil fuel in the cement firing kiln 5 and the calcining furnace 4 is nitrogen oxides as compared with the exhaust gas generated by using only the fossil fuel containing no methane as fuel. Since the content of (NOx) and sulfur oxide (SOx) is low, the exhaust gas can be made cleaner. Therefore, even when a part of the exhaust gas is discharged to the atmosphere from the chimney 11 of the cement manufacturing facility 50, air pollution can be reduced, and deterioration of the catalyst and the like of the methanization apparatus 31 can be suppressed.
  • 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 to either one.
  • methane was generated using the exhaust gas from both the cement firing kiln 5 and the calcining furnace 4, it can also be applied to cement manufacturing equipment that does not have a calcining furnace. In that case, the cement firing kiln can be used. Produces methane from the exhaust gas of the kiln.

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Abstract

La présente invention comprend une étape de production de méthane qui consiste à ajouter de l'hydrogène à du CO2 dans des gaz de fumées provenant d'une installation de production de ciment ou du CO2 séparé et récupéré à partir desdits gaz de fumées pour générer du méthane, et une étape de consommation de méthane qui consiste à utiliser le méthane généré au cours de l'étape de production de méthane en tant que combustible de substitution de la totalité ou une partie des combustibles fossiles pour l'installation de production de ciment. L'étape de génération de méthane et l'étape de consommation de méthane sont répétées en continu, et le CO2 provenant de sources d'énergie est réduit par méthanisation et utilisation efficace du CO2 dans le gaz d'échappement de ciment non dérivé de combustibles fossiles.
PCT/JP2021/020403 2020-06-04 2021-05-28 Procédé et système d'utilisation de co2 dans un gaz de fumées de production de ciment WO2021246315A1 (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
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JPH10185170A (ja) * 1996-12-25 1998-07-14 Ebara Corp 燃焼装置
JP2015030653A (ja) * 2013-08-06 2015-02-16 千代田化工建設株式会社 エネルギー利用システムおよびエネルギー利用方法
WO2015055349A1 (fr) * 2013-10-16 2015-04-23 Paul Scherrer Institut Procédé/unité intégrée de stockage du co2 par conversion en un gaz naturel de synthèse
JP2018052746A (ja) * 2016-09-26 2018-04-05 太平洋セメント株式会社 セメント焼成装置及びセメントクリンカ焼成方法
JP2019172595A (ja) * 2018-03-27 2019-10-10 大阪瓦斯株式会社 燃焼排ガス中の二酸化炭素のメタン化方法及びメタン製造設備

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JPH10185170A (ja) * 1996-12-25 1998-07-14 Ebara Corp 燃焼装置
JP2015030653A (ja) * 2013-08-06 2015-02-16 千代田化工建設株式会社 エネルギー利用システムおよびエネルギー利用方法
WO2015055349A1 (fr) * 2013-10-16 2015-04-23 Paul Scherrer Institut Procédé/unité intégrée de stockage du co2 par conversion en un gaz naturel de synthèse
JP2018052746A (ja) * 2016-09-26 2018-04-05 太平洋セメント株式会社 セメント焼成装置及びセメントクリンカ焼成方法
JP2019172595A (ja) * 2018-03-27 2019-10-10 大阪瓦斯株式会社 燃焼排ガス中の二酸化炭素のメタン化方法及びメタン製造設備

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