CN102341509B - Method for separating and collecting carbon dioxide from blast furnace gas in blast furnace gas utilization process - Google Patents
Method for separating and collecting carbon dioxide from blast furnace gas in blast furnace gas utilization process Download PDFInfo
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- CN102341509B CN102341509B CN200980157805.4A CN200980157805A CN102341509B CN 102341509 B CN102341509 B CN 102341509B CN 200980157805 A CN200980157805 A CN 200980157805A CN 102341509 B CN102341509 B CN 102341509B
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- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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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
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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
- B01D53/1418—Recovery of products
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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
- B01D53/1425—Regeneration of liquid absorbents
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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
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
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- 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
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
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- 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
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- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/204—Amines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/025—Other waste gases from metallurgy plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/65—Employing advanced heat integration, e.g. Pinch technology
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
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- 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
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- 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
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- 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
- Y02P10/25—Process efficiency
Abstract
Disclosed is a method for separating and collecting carbon dioxide from a blast furnace gas in a blast furnace gas utilization process. The method comprises: introducing a blast furnace gas removed from a blast furnace into an absorption column; allowing carbon dioxide contained in the blast furnace gas to be absorbed in an absorption liquid in the absorption column; introducing a portion of the blast furnace gas from which carbon dioxide has been removed into an expansion turbine; reducing the pressure in the expansion turbine; storing the portion of the blast furnace gas in a gas holder and utilizing the stored gas as a heating fuel for an iron-making process; introducing another portion of the blast furnace gas from which carbon dioxide has been removed into a blast gas compressor that can be driven by the expansion turbine; increasing the pressure in the blast gas compressor; introducing the another portion of the blast furnace gas into a gas turbine generator, burning the another portion of the blast furnace gas under a high pressure and utilizing the burned gas as a fuel for the generation of an electrical power; introducing the absorption liquid which has absorbed carbon dioxide in the absorption column into a regeneration column; heating the absorption liquid introduced into the regeneration column by means of heat of a discharged gas from the gas turbine generator to remove carbon dioxide from the absorption liquid; and circulating the absorption liquid from which carbon dioxide has been removed from the regeneration column to the absorption column.
Description
Technical field
The present invention relates in blast furnace gas utilization process from the method for blast furnace gas Separation and Recovery carbonic acid gas, relate to by blast furnace gas for iron manufacturing process or generating use in from the method for blast furnace gas Separation and Recovery carbonic acid gas.
Background technology
In the past, the blast furnace gas of discharging from blast furnace still had the pressure of 0.2～0.3MPa dust being removed with particle collector, therefore adopted TRT (furnace top pressure recovery gas turbine: Top pressure Recovery Turbine) use it for generating.Then, adopt this blast furnace gas as the fuel of the heating use in iron manufacturing process and generating use.
In recent years, in order to improve generating efficiency, there is the method by making blast furnace gas burn and generate electricity in gas turbine generating device.As one example, there is the disclosed method of patent documentation 1.
Adopt Fig. 7 to describe the summary of above-mentioned conventional art.Fig. 7 is the system diagram of the gas turbine generating device using blast furnace gas as fuel, i.e. the figure that utilizes method of illustration blast furnace gas.As shown in Figure 7, by removing the blast furnace gas of 0.2～0.3MPa left and right that dust is cleaned, on one side, by TRT5, generate electricity after the step-down of one side, be stored in gas tank 8.When not making TRT5 running, blast furnace gas, after being depressurized by reducing valve 6, being eliminated the noise by sourdine 7, is stored in gas tank 8.
By being stored in blast furnace gas branch in gas tank 8, import to the heated side in the iron manufacturing process such as gas turbine generating device 9 sides and not shown hotblast stove, coke oven.The blast furnace gas that imports to gas turbine generating device 9 sides is mixed with not shown coke-oven gas (COG) etc., combustion-supporting to the required heat of gas turbine combustion, by fuel gas compressors 9-1 from normal atmosphere boosts, with the air mixed of boosting by air compressor 9-5, in burner 9-2, burn.The blast furnace gas burning in burner 9-2 drives internal combustion turbine 9-3, then supplies with steam boiler 9-4, by vapour line heating is generated to superheated vapour.Utilize this superheated vapour driving steam turbine 9-7, thereby generate electricity.
On the other hand, importing the blast furnace gas of the heated side in iron manufacturing process and coke-oven gas together uses as the fuel of the heating use of hotblast stove or coke oven etc.
So, utilizing in process of the blast furnace gas in the past shown in Fig. 7, by TRT5, make the pressure decreased of the blast furnace gas of purification, thereby generate electricity, then, after in being stored in gas tank 8, a part for the blast furnace gas of storage is burnt under the state that reduces pressure, as the heating in the iron manufacturing process such as hotblast stove or coke oven, with fuel, use, on the other hand, by the remaining blast furnace gas storing is boosted, and it is burnt in gas turbine generating device 9, thereby generate electricity.
In recent years, in order to prevent global greenhouse effect, cut down the arranging into as important problem of carbonic acid gas.Therefore,, about the separation and recovery method of carbonic acid gas, several different methods had been proposed in the past.As an example, the secondary soft coal gas that produces etc. is disclosed in patent documentation 2, by the method for chemical absorption method Separation and Recovery carbonic acid gas from iron work.The method is to receive carbonic acid gas from secondary soft coal aspiration by chemical absorption liquid, the heating of chemical absorption liquid is made in the process of carbon dioxide separation, the low-quality used heat producing by being applied in iron work, with compact equipment high efficiency rate and at an easy rate Separation and Recovery from carbonic acid gas, there is the carbon dioxide separation recovery method of the carbonic acid gas of the extensive discharge in source.
Prior art document
Patent documentation
Patent documentation 1: Japanese kokai publication hei 9-79046 communique
Patent documentation 2: TOHKEMY 2004-292298 communique
Summary of the invention
Invent problem to be solved
But, in above-mentioned patent documentation 1, about absorption, the separation of the carbonic acid gas in coal gas, all do not have open.Thereby, can not process import to contained carbonic acid gas in the blast furnace gas of the heated side in iron manufacturing process and the exhaust from internal combustion turbine after blast furnace gas combustion via gas tank 8.
In addition, for blast furnace gas being burnt in internal combustion turbine 9-3 after the pressure of blast furnace gas is once being dropped to normal atmosphere, fuel gas compressors 9-1 need to be set to boost to blast furnace gas, need to spend equipment cost for this reason, and in step-down and while boosting, there is power loss, the problem that exists the effciency of energy transfer of Whole Equipment to reduce.
In addition, the quantity discharged of the blast furnace gas of discharging from blast furnace is very large, so its treatment capacity is large.Thereby in order to have absorbed absorption liquid heating, the regeneration of great amount of carbon dioxide, in the method for the low-quality used heat disclosed in above-mentioned patent documentation 2, utilization produces at iron work, its heat energy is obviously not enough.Thereby, process a large amount of blast furnace gases, the new heating arrangements that needs configuration that absorption liquid is heated and regenerated, is difficult to realize as practical technique.
Main purpose of the present invention is, solve the problem of above-described conventional art, in order to improve generating efficiency, to burn in the method for generating electricity in gas turbine generating device by the blast furnace gas that makes to be cleaned, providing a kind of can not reduce the effciency of energy transfer of Whole Equipment and in the situation that do not configure the new heating arrangements that absorption liquid is heated and regenerated, great amount of carbon dioxide contained in the exhaust from internal combustion turbine in blast furnace gas and after blast furnace gas combustion carried out to the method for Separation and Recovery.
For the means of dealing with problems
Method from blast furnace gas Separation and Recovery carbonic acid gas in blast furnace gas utilization process of the present invention comprises the steps: the blast furnace gas taking out from blast furnace to import absorption tower; In described absorption tower, make the carbonic acid gas in described blast furnace gas be absorbed by liquid absorption; A part of having removed the described blast furnace gas of described carbonic acid gas is imported to expansion turbine, after decompression, be stored in gas tank, as the heating of iron manufacturing process, with fuel, utilize; Another part of having removed the described blast furnace gas of described carbonic acid gas is imported to the blast furnace gas compressor being driven by described expansion turbine, after boosting, import gas turbine generating device, it is under high pressure burnt, as the fuel generating electricity, utilize; The absorption liquid that has absorbed described carbonic acid gas on described absorption tower is imported to regenerator column; By utilizing the heat of the exhaust of described gas turbine generating device to heat the described absorption liquid importing in described regenerator column, from described absorption liquid, remove described carbonic acid gas; The described absorption liquid that has made to remove described carbonic acid gas circulates to described absorption tower from described regenerator column.
In above-mentioned invention, the blast furnace gas from blast furnace is removed to carbonic acid gas in absorption tower, and as in the thermal source of iron manufacturing process, also can be used as the fuel of gas turbine generating device for generating.
Now, by boosting to giving the blast furnace gas of gas turbine generating device in advance with blast furnace gas compressor 13, cut down the energy consuming in fuel gas compressors 9-1, can make the generated energy of gas turbine generating device 9 integral body increase.In the driving of blast furnace gas compressor 13, utilize the energy while making as the heating of iron manufacturing process with the blast furnace gas step-down of fuel by expansion turbine 14.The increasing amount of the generated energy in gas turbine generating device is greater than the coal gas of mode in the past and utilizes the generated energy of the TRT in method, so can improve effciency of energy transfer as a whole.
Now, by absorption tower being set before blast furnace gas being branched off into expansion turbine and blast furnace gas compressor, can in absorption tower, make blast furnace gas reach the high pressure before decompression, carbonic acid gas can be maintained to higher level at the absorptive character in absorption liquid, and absorption tower can be gathered in to 1 place.In addition,, owing to being that carbonic acid gas is removed by the composition that do not fire in blast furnace gas, therefore the heat as fuel gas improves, and can cut down the addition of the combustion-supporting materials such as COG.
The regeneration of the absorption liquid adopting while in addition, being used to remove carbonic acid gas in the absorption tower above from the heat of the exhaust of internal combustion turbine.So, can carry out expeditiously the Separation and Recovery of carbonic acid gas.
In blast furnace gas utilization process of the present invention, from the method for blast furnace gas Separation and Recovery carbonic acid gas, preferably the exhaust of gas turbine generating device is imported in ，Fu absorption tower, secondary absorption tower the carbonic acid gas in exhaust is absorbed by liquid absorption.
In above-mentioned the present invention, the carbonic acid gas containing in blast furnace gas from blast furnace is absorbed in above-mentioned absorption tower, and can absorb because of the carbonic acid gas that blast furnace gas burns and produces in gas turbine generating device thereafter on enough secondary absorption towers the circulation that can use expeditiously absorption liquid when increasing the Separation and Recovery amount of carbonic acid gas.
In blast furnace gas utilization process of the present invention from the method for blast furnace gas Separation and Recovery carbonic acid gas, also the exhaust of described gas turbine generating device can be imported to secondary absorption tower, the carbonic acid gas in described exhaust is absorbed by described absorption liquid in described secondary absorption tower.
In above-mentioned the present invention, for the carbonic acid gas producing in iron manufacturing process, also can absorb with secondary absorption tower, can be when increasing the Separation and Recovery amount of carbonic acid gas, the circulation of effectively using absorption liquid.In addition, by mixing by the exhaust from internal combustion turbine with from the exhaust of iron manufacturing process, can reduce carbon dioxide absorbent solution gas temperature in heat exchanger for heating, what can prevent from causing because carbon dioxide absorbent solution is overheated is deteriorated.
In blast furnace gas utilization process of the present invention from the method for blast furnace gas Separation and Recovery carbonic acid gas, the heat having with the exhaust of described internal combustion turbine at the required heat of the heating of described absorption liquid is compared when considerably less, as described gas turbine generating device, employing has steam boiler, the device of steam turbine and condenser, heating by the heat of a hot part for the exhaust of described internal combustion turbine and described condenser for described absorption liquid, described steam boiler utilizes the heat of the exhaust of internal combustion turbine to produce high pressure steam, described steam turbine utilization is the power as described gas turbine generating device from the high pressure steam of this steam boiler, described condenser carries out condensing by the steam of finishing using from this steam turbine.
In above-mentioned the present invention, due to the heating for absorption liquid by the condensing heat discarding of gas turbine generating device in the past, the hot utilising efficiency that therefore blast furnace gas combustion produces in gas turbine generating device improves.
Invention effect
According to the present invention, in order to improve generating efficiency, to burn in the method for generating electricity in gas turbine generating device by the blast furnace gas that makes to be cleaned, can not reduce the effciency of energy transfer of Whole Equipment and in the situation that do not configure the new heating arrangements that absorption liquid is heated and regenerated, great amount of carbon dioxide contained in the exhaust from internal combustion turbine in blast furnace gas and after blast furnace gas combustion carried out to Separation and Recovery.
Accompanying drawing explanation
Fig. 1 means the skeleton diagram of the 1st embodiment of the present invention.
Fig. 2 means the figure of the effect of the structure A in the 1st embodiment.
Fig. 3 means the skeleton diagram of the 2nd embodiment of the present invention.
Fig. 4 means the skeleton diagram of the 3rd embodiment of the present invention.
Fig. 5 means the skeleton diagram of the 4th embodiment of the present invention.
Fig. 6 means the skeleton diagram of the 5th embodiment of the present invention.
Fig. 7 means the skeleton diagram of past case.
Embodiment
Below, with reference to accompanying drawing, to of the present invention, be preferred embodiment elaborated.
[the 1st embodiment]
The 1st embodiment of the present invention shown in Fig. 1.
In Fig. 1,6 represent reducing valve, and 7 represent sourdine, and 13 represent blast furnace gas compressor, and 14 represent expansion turbine, by form the mechanism of decompressor of blast furnace gas with upper-part.In addition, 10 represent absorption tower, and 9-4A represents carbon dioxide absorbent solution heating heat exchanger, and 12 represent regenerator column.
In figure, arrow B is the high pressure cleaning blast furnace gas that the various particle collectors (diagram is omitted) by illustrating in above-mentioned conventional art item are cleaned, and its part is branched off into pipeline C, and other parts are discharged to arrow G via pipeline E, F.On the other hand, the absorption liquid of the mobile expression carbonic acid gas shown in arrow L, M circulates.Arrow K is the carbonic acid gas that separation obtains.
Have again, in each embodiment afterwards, for identical key element, adopt identical symbol, to avoid repeat specification.
In the present invention, will import to the pipeline C that makes its pipeline E burn and make its heating use fuel combustion in iron manufacturing process in gas turbine generating device 9 by removing the blast furnace gas branch of 0.2～0.3MPa left and right that dust is cleaned.In pipeline C, blast furnace gas, reducing after pressure by expansion turbine 14, is stored in gas tank 8, as the heating in the iron manufacturing process of not shown hotblast stove, coke oven etc., with fuel, uses.On the other hand, in circuit E, make in gas turbine generating device 9 the blast furnace gas compressor 13 that the blast furnace gas of burning drives by the rotation by expansion turbine 14 boost.The blast furnace gas boosting is supplied with to gas turbine generating device 9, after further being boosted in fuel gas compressors 9-1, in burner 9-2, burn.The blast furnace gas burning in burner 9-2 is by driving internal combustion turbine 9-3 to generate electricity.Then, blast furnace gas is supplied with to carbon dioxide absorbent solution heating and use heat exchanger 9-4A, to having removed the pipeline of the absorption liquid of carbonic acid gas, heat (being structure A above).
In addition, the blast furnace gas that never illustrated blast furnace takes out is imported in 10， absorption tower, absorption tower 10 carbonic acid gas in blast furnace gas is absorbed by liquid absorption.By the 10 interior absorption liquid L that absorbed carbonic acid gas import regenerator column 12 on absorption tower, in regenerator column 12, from absorption liquid, remove carbonic acid gas.Made to remove the absorption liquid M of carbonic acid gas from regenerator column 12 10 circulations to absorption tower (being structure B above).
Fig. 2 utilizes by the structure A to above-mentioned and blast furnace gas in the past that method compares, the figure of its effect of illustration.In the present embodiment, according to said structure A, by adopting at the expansion energy that utilizes expansion turbine 14 that the heating in iron manufacturing process is produced during with fuel step-down, the blast furnace gas that can make to be used as the fuel of gas turbine generating device 9 boosts, and as the fuel feed of gas turbine generating device 9.
Thus, blast furnace gas in the past utilize method in generated energy I in the TRT5 of Fig. 7 of using disappear, but due to high voltage supply blast furnace gas, therefore can required motivating force be cut to IV ' from IV by fuel gas compressors 9-1.The required motivating force III of air compressor 9-5 does not change.
In addition, because total output VI of gas turbine generating device 9 is constant, so the generated energy of gas turbo-generator 9-6 is increased to II ' from II.This increasing amount equates with the energy V reclaiming by blast furnace gas compressor 13.It is higher than the TRT generated energy I in mode in the past, and therefore generated energy increases as a whole, and the energy utilization efficiency of blast furnace gas improves.
In the present embodiment, although the TRT5 replacing in the past need to arrange blast furnace gas compressor 13 and expansion turbine 14, but can make the fuel gas compressors 9-1 miniaturization of gas turbine generating device 9, and because being stored in the amount of the blast furnace gas in gas tank 8, reduce, can also reduce the volume of gas tank 8.Therefore, can reduce equipment cost as a whole.
Have, the pressure of the blast furnace gas being cleaned and flow change because of the operational stage of blast furnace again, but in the operation of gas turbine generating device 9, the pressure of the blast furnace gas preferably adopting in gas turbine generating and flow keep constant.
Thereby, make by the constant flow of the blast furnace gas of blast furnace gas compressor 13 and expansion turbine 14, and remaining blast furnace gas is being depressured to after normal atmosphere by reducing valve 6, be stored in gas tank 8.Thus, can make the pressure of the blast furnace gas that adopts in gas turbine generating and flow keep constant.
In the present invention, the method that the flow of the blast furnace gas by reducing valve 6 is controlled does not limit, but by measuring with 16 pairs of flows that import the blast furnace gas of blast furnace gas compressor 13 and expansion turbine 14 of under meter, and by adjusting the aperture of flow control valve 15, make this flow reach constant, can adjust the flow that imports blast furnace gas compressor 13 and expansion turbine 14.
As the separate absorbent method of carbonic acid gas applicable in the present invention, such as there being the chemical absorption method that adopts the chemical absorption liquid such as amine.
The high pressure cleaning blast furnace gas B being cleaned taking out is as shown in Figure 1 imported to the absorption tower 10 of the leading portion of the mechanism of decompressor that is arranged on blast furnace gas from blast furnace.In this absorption tower 10, by about 30 ℃～50 ℃, this blast furnace gas is contacted with the chemical absorption liquid as carbon dioxide absorption medium, the carbonic acid gas in blast furnace gas is absorbed by chemical absorption liquid.
Then, a part of having removed the blast furnace gas of carbonic acid gas is transported to such as not shown coke oven, process furnace etc. via gas tank 8, in various iron manufacturing process burning and as thermal source utilization.
On the other hand, another part of having removed the blast furnace gas of carbonic acid gas burns in gas turbine generating device 9, and emission gases is heated with during heat exchanger 9-4A is from smoke stack emission to atmosphere via carbon dioxide absorbent solution.
Now, the absorption liquid that has absorbed carbonic acid gas in absorption tower 10 is by with from regenerator column 12, to absorption tower, the absorption liquid M of 10 circulations carry out heat exchange and are prepared heating, to the interior importing of regenerator column 12, distributed from being configured in the nozzle of tower internal upper part.
On the other hand, about remain in the absorption liquid of regenerator column 12 inner bottom parts with specified amount after removing carbonic acid gas, from regenerator column 12, extract its part continuously, by carbon dioxide absorbent solution, heat with heat exchanger 9-4A and turn back to regenerator column 12.Heat exchanger 9-4A contacts with the exhaust of internal combustion turbine 9-3, and the absorption liquid heat by exhaust among heat exchanger 9-4A therefore extracting from regenerator column 12 is heated to 120 ℃ of left and right.
After by the heating of the heat of the exhaust of internal combustion turbine 9-3, turn back to the absorption liquid of regenerator column 12 in the interior gasification of regenerator column 12, contact with the absorption liquid scattering from tower internal upper part, by this absorption liquid heating.If will absorb the absorption liquid heating of carbonic acid gas, can be from heated absorption liquid separating carbon dioxide.Separated carbonic acid gas K is discharged from regenerator column 12.On the other hand, removed the absorption liquid of carbonic acid gas and fallen regenerator column 12 inner bottom parts, after residual specified amount, from regenerator column 12 10 circulations to absorption tower.
As mentioned above, from the heat of the exhaust of gas turbine generating device 9, be used in the regeneration of the absorption liquid adopting while removing carbonic acid gas in absorption tower above.So, can carry out expeditiously the Separation and Recovery of carbonic acid gas in the situation that new heating arrangements is not set, and can carry out the processing of a large amount of blast furnace gases.
Total heat from the exhaust of internal combustion turbine 9-3 heats with heat exchanger 9-4A all as carbon dioxide absorbent solution heating use by carbon dioxide absorbent solution, the steam turbine 9-7 of Fig. 7 is set therefore not needing to resemble in the past, can simplified apparatus, and effectively utilize energy.In addition, before use blast furnace gas is as fuel, by the composition that do not fire in blast furnace gas, be that carbonic acid gas is removed, therefore the heat as fuel gas improves, and can cut down the addition of the ignition dopes such as COG (coke-oven gas).
Therefore in addition, as mentioned above, for example compressed processing of the carbonic acid gas that Separation and Recovery obtains, with supercritical state, be pressed into undergroundly, can significantly cut down the carbonic acid gas being discharged in atmosphere.
In addition, owing to the equipping position on absorption tower 10 being located to the back segment of the various particle collectors of blast furnace gas, so this blast furnace gas is cleaned, and can not make absorption liquid deteriorated.
[the 2nd embodiment]
The 2nd embodiment of the present invention shown in Fig. 3.
In Fig. 3, present embodiment is with respect to the 1st embodiment difference structurally, in carbon dioxide absorbent solution heating, with the back segment of heat exchanger 9-4A, new secondary absorption tower 11 is set.Other structure is the structure identical with Fig. 1, therefore the explanation repeating is omitted.
The exhaust of gas turbine generating device 9 contacts with absorption liquid by secondary absorption tower 11, after carbonic acid gas being removed from exhaust, is discharged into outside system.
On the other hand, in secondary absorption tower 11, absorbed the absorption liquid of carbonic acid gas and imported in regenerator column 12 with absorbed the absorption liquid of carbonic acid gas in absorption tower 10 together with, from being configured in the nozzle of tower internal upper part, scattered.The process of removing of later carbonic acid gas is identical with the 1st embodiment.
[the 3rd embodiment]
The 3rd embodiment of the present invention shown in Fig. 4.
In Fig. 4, its structure, except the structure at the 2nd embodiment illustrated in fig. 3, is the exhaust N introducing carbon dioxide absorption liquid heating heat exchanger 9-4A in iron manufacturing process, and collaborates with the exhaust of gas turbine generating device 9.Other structure is the structure identical with Fig. 3, therefore the explanation repeating is omitted.
Exhaust L in iron manufacturing process contacts with absorption liquid by secondary absorption tower 11 together with the exhaust of gas turbine generating device 9, after carbonic acid gas being removed from exhaust, is discharged into outside system.In addition,, by mixing by the exhaust from internal combustion turbine with from the exhaust of iron manufacturing process, carbon dioxide absorbent solution heating reduces with the gas temperature in heat exchanger 9-4A.Therefore, can prevent that carbon dioxide absorbent solution is because of overheated and deteriorated.
[the 4th embodiment]
The 4th embodiment of the present invention shown in Fig. 5.
In Fig. 5,9-4 represents that steam boiler, 9-7 represent that steam turbine, 9-8 represent carry out the condenser of condensing from the steam of finishing using of steam turbine 9-7.In steam boiler 9-4, be provided with two heat exchange pipe 9-4B, 9-4C.The heat of the exhaust by internal combustion turbine 9-3, a side heat exchange pipe 9-4B produces high pressure steam I, and driving steam turbine 9-7 generates electricity, and another heat exchange pipe 9-4C heats remain in the absorption liquid of regenerator column 12 inner bottom parts with specified amount.
For remain in the absorption liquid of regenerator column 12 inner bottom parts with specified amount after carbonic acid gas is removed, continue to extract its part from regenerator column 12, import condenser 9-8.Import to absorption liquid in condenser 9-8 and by the steam with finishing using, carry out heat exchange and be heated, on the other hand, the steam of finishing using is by carrying out heat exchange by condensing with absorption liquid.Absorption liquid through condenser 9-8 turns back to regenerator column 12 by heat exchange pipe 9-4C.Heat exchange pipe 9-4C contacts with the exhaust of internal combustion turbine 9-3, the heat heating that the absorption liquid therefore extracting from regenerator column 12 is deflated among heat exchange pipe 9-4C.The process that later carbonic acid gas is removed is identical with the 1st embodiment.
The application method with the method from blast furnace gas Separation and Recovery carbonic acid gas of above-mentioned formation, preferably in the situation that remarkable few enforcement of the heat that the required heat of the heating of absorption liquid has than the exhaust of steam turbine 9-7.
; as gas turbine generating device 9; employing has the device of steam boiler 9-4, steam turbine 9-7 and condenser 9-8; heating by the condensing heat in a hot part for the exhaust of internal combustion turbine 9-3 and condenser 9-8 for absorption liquid; described steam boiler 9-4 utilizes a hot part for the exhaust of internal combustion turbine 9-3 to produce high pressure steam I; described steam turbine 9-7 utilizes the power as gas turbine generating device 9 from the high pressure steam of this steam boiler, and described condenser 9-8 carries out condensing by the steam of finishing using from this steam turbine 9-7.
In above-mentioned invention, in forming the condenser 9-8 of gas turbine generating device 9, can the heating for absorption liquid by the condensing heat slatterning in the past.Therefore the hot utilising efficiency, being produced by blast furnace gas combustion in gas turbine generating device 9 improves.
[the 5th embodiment]
The 5th embodiment of the present invention shown in Fig. 6.
In Fig. 6, its structure, except structure illustrated in fig. 5, is provided with secondary absorption tower 11 in carbon dioxide absorbent solution heating with the back segment of heat exchanger 9-4A.Other structure is the structure identical with Fig. 5, therefore the explanation repeating is omitted.
The exhaust of gas turbine generating device 9 contacts with absorption liquid by secondary absorption tower 11, having removed from exhaust after carbonic acid gas, is discharged into outside system.
On the other hand, make to have absorbed in secondary absorption tower 11 absorption liquid of carbonic acid gas with absorbed the absorption liquid of carbonic acid gas in absorption tower 10 together with to the interior importing of regenerator column 12, from being configured in the nozzle of tower internal upper part, scatter.The process that later carbonic acid gas is removed is identical with the 1st embodiment.
Utilizability in industry
Method from blast furnace gas Separation and Recovery carbonic acid gas of the present invention can be used in: by the blast furnace gas that makes to be cleaned burn gas turbine generating device the operation of generating electricity and the operation that has heated and regenerated having absorbed the absorption liquid of great amount of carbon dioxide contained in the exhaust from internal combustion turbine in blast furnace gas and after blast furnace gas combustion.
Nomenclature
1 particle collector
2 the 1st venturi scrubbers
3 the 2nd venturi scrubbers
4 dry dust collection devices
5 TRT (furnace top pressure recovery gas turbine)
6 reducing valve
7 sourdines
8 gas tanks
9 gas turbine generating devices
9-1 fuel gas compressors
9-2 burner
9-3 internal combustion turbine
9-4 steam boiler
9-4A carbon dioxide absorbent solution heating heat exchanger
9-5 air compressor
9-6 generator
9-7 steam turbine
9-8 condenser
10 absorption towers
11 secondary absorption towers
12 regenerator columns
13 blast furnace gas compressors
14 expansion turbines
15 flow control valves
16 under meters
A blast furnace gas
B high pressure cleaning blast furnace gas
The heating fuel gas of C iron manufacturing process
D coke-oven gas
E gas turbine generating device fuel gas
F air
G exhaust
H water coolant
I steam
J waste gas
K carbonic acid gas
L has absorbed the carbon dioxide absorbent solution of carbonic acid gas
Carbon dioxide absorbent solution before M absorbing carbon dioxide
N is from the exhaust of iron manufacturing process
Claims (2)
- In blast furnace gas utilization process from a method for blast furnace gas Separation and Recovery carbonic acid gas, it comprises the steps:The blast furnace gas taking out from blast furnace is imported to absorption tower;In described absorption tower, make the carbonic acid gas in described blast furnace gas be absorbed by liquid absorption;A part of having removed the described blast furnace gas of described carbonic acid gas is imported to expansion turbine, after decompression, be stored in gas tank, as the heating of iron manufacturing process, with fuel, utilize;Another part of having removed the described blast furnace gas of described carbonic acid gas is imported to the blast furnace gas compressor being driven by described expansion turbine, after boosting, import gas turbine generating device, it is under high pressure burnt, as the fuel generating electricity, utilize;The absorption liquid that has absorbed described carbonic acid gas on described absorption tower is imported to regenerator column;By utilizing the heat of the exhaust of described gas turbine generating device to heat the described absorption liquid importing in described regenerator column, from described absorption liquid, remove described carbonic acid gas;The described absorption liquid that has made to remove described carbonic acid gas circulates to described absorption tower from described regenerator column;The exhaust of described gas turbine generating device is imported to secondary absorption tower, in described secondary absorption tower, make the carbonic acid gas in described exhaust be absorbed by described absorption liquid.
- In blast furnace gas utilization process according to claim 1 from the method for blast furnace gas Separation and Recovery carbonic acid gas, wherein, as described gas turbine generating device, employing has steam boiler, the device of steam turbine and condenser, heating by the heat of a hot part for the exhaust of internal combustion turbine and described condenser for described absorption liquid, described steam boiler utilizes the heat of the exhaust of described internal combustion turbine to produce high pressure steam, described steam turbine utilization is the power as described gas turbine generating device from the high pressure steam of this steam boiler, described condenser carries out condensing by the steam of finishing using from this steam turbine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2009/005047 WO2011039810A1 (en) | 2009-09-30 | 2009-09-30 | Method for separating and collecting carbon dioxide from blast furnace gas in blast furnace gas utilization process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102341509A CN102341509A (en) | 2012-02-01 |
| CN102341509B true CN102341509B (en) | 2014-03-12 |
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| CN200980157805.4A Expired - Fee Related CN102341509B (en) | 2009-09-30 | 2009-09-30 | Method for separating and collecting carbon dioxide from blast furnace gas in blast furnace gas utilization process |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101299894B1 (en) |
| CN (1) | CN102341509B (en) |
| WO (1) | WO2011039810A1 (en) |
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| KR101355568B1 (en) * | 2012-01-31 | 2014-01-27 | 현대제철 주식회사 | Strorage apparatus of by-product gas in furnace and controlling method |
| KR101961436B1 (en) * | 2017-09-13 | 2019-03-22 | 한국전력기술 주식회사 | Apparatus for capturing carbon dioxide using heat of compression |
| CN114456854A (en) * | 2022-02-13 | 2022-05-10 | 新疆八一钢铁股份有限公司 | Method for removing CO in hydrogen-rich carbon circulating blast furnace gas2Of (2) a |
| CN117258481A (en) * | 2023-10-11 | 2023-12-22 | 中国科学院过程工程研究所 | Blast furnace gas CO 2 Method for efficiently capturing and utilizing high heat value of gas |
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| CN86105560A (en) * | 1985-07-26 | 1987-02-04 | 日本纲管株式会社 | The working method of blast furnace |
| JP2004309067A (en) * | 2003-04-09 | 2004-11-04 | Nippon Steel Corp | Method of using blast furnace gas |
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| JP2009126737A (en) * | 2007-11-22 | 2009-06-11 | Nippon Steel Engineering Co Ltd | Method for separating and recovering carbon dioxide from blast furnace gas |
| JP2009174025A (en) * | 2008-01-28 | 2009-08-06 | Nippon Steel Engineering Co Ltd | Method for use of blast furnace gas |
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-
2009
- 2009-09-30 WO PCT/JP2009/005047 patent/WO2011039810A1/en active Application Filing
- 2009-09-30 CN CN200980157805.4A patent/CN102341509B/en not_active Expired - Fee Related
- 2009-09-30 KR KR1020117020384A patent/KR101299894B1/en active IP Right Grant
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| CN86105560A (en) * | 1985-07-26 | 1987-02-04 | 日本纲管株式会社 | The working method of blast furnace |
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| JP2004309067A (en) * | 2003-04-09 | 2004-11-04 | Nippon Steel Corp | Method of using blast furnace gas |
| JP2005195283A (en) * | 2004-01-08 | 2005-07-21 | Nippon Steel Corp | Method of absorbing co2 in by-product gas using waste heat of circulating refrigerant of stave cooler |
| JP2009126737A (en) * | 2007-11-22 | 2009-06-11 | Nippon Steel Engineering Co Ltd | Method for separating and recovering carbon dioxide from blast furnace gas |
| JP2009174025A (en) * | 2008-01-28 | 2009-08-06 | Nippon Steel Engineering Co Ltd | Method for use of blast furnace gas |
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| 储满生等.CO2脱除与固定技术概论.《2006年中国非高炉炼铁会议论文集》.2006, |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011039810A1 (en) | 2011-04-07 |
| KR101299894B1 (en) | 2013-08-23 |
| CN102341509A (en) | 2012-02-01 |
| KR20110124763A (en) | 2011-11-17 |
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