CN113913571A - Device for separating carbon dioxide in blast furnace gas by using metallurgical slag and separation method thereof - Google Patents
Device for separating carbon dioxide in blast furnace gas by using metallurgical slag and separation method thereof Download PDFInfo
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- CN113913571A CN113913571A CN202111160363.8A CN202111160363A CN113913571A CN 113913571 A CN113913571 A CN 113913571A CN 202111160363 A CN202111160363 A CN 202111160363A CN 113913571 A CN113913571 A CN 113913571A
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- 239000002893 slag Substances 0.000 title claims abstract description 136
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 40
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 24
- 238000000926 separation method Methods 0.000 title claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001174 ascending effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052742 iron Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 95
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000009919 sequestration Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 229910001341 Crude steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001748 carbonate mineral Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000629 steam reforming Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of blast furnace iron making, and discloses a device for separating carbon dioxide from blast furnace gas by using metallurgical slag. The invention also discloses a separation method of the device for separating the carbon dioxide in the blast furnace gas by using the metallurgical slag. The invention relates to a device for separating carbon dioxide in blast furnace gas by using metallurgical slag and a separation method thereof, which are used for separating CO2Mineralization is beneficial to iron making, low carbon and emission reduction, and the slag is directly utilizedThe energy conversion efficiency is improved.
Description
Technical Field
The invention relates to the technical field of blast furnace iron making, in particular to a device for separating carbon dioxide in blast furnace gas by using metallurgical slag and a separation method thereof.
Background
The main cause of global warming is an increase in the concentration of greenhouse gases, among which CO in the atmosphere2Contributing two thirds of the warming effect. China is the largest world consuming country for producing steel, accounts for nearly 50% of the world's crude steel yield, and China's steel enterprises discharge CO per ton of steel21.8-2 tons, wherein CO in blast furnace gas2About 22 percent of the total carbon content, about 10 percent of converter gas content and CO2Capture and storage (sequestration) has been extensively studied worldwide.
Metallurgical slag is the largest byproduct of steel enterprises, which have four types of iron slag and steel slag, including Blast Furnace (BF) iron slag, Basic Oxygen Furnace (BOF) steel slag, Electric Arc Furnace (EAF) steel slag, Ladle Furnace (LF) steel slag, and the like. Blast furnace slag is a byproduct of iron making, 1 ton of molten iron is produced, about 0.3 ton of blast furnace slag is produced, 0.1-0.3 ton of steel slag is produced along with production of 1 ton of crude steel, metallurgical slag contains alkali metals such as CaO, MgO and the like, after slag iron discharged from a blast furnace taphole is separated, the slag temperature in a slag runner is more than 1400 ℃, the slag flows in a liquid state and enters a hydraulic slag flushing tank, an Inba system or a dry slag pit and other devices, the slag carrying a large amount of energy is usually naturally cooled or rapidly quenched by water in a slag pile, the high-quality thermal energy of the slag is wasted, and the energy efficiency is also reduced.
The basicity of metallurgical slag determines its CO2Sequestration capacity, for example, blast furnace slag can be used to capture its gaseous carbon dioxide emissions, and these oxides can be carbonates that are stable in the presence of carbon dioxide. In contrast to geological sequestration, mineral carbonization is undoubtedly a permanent form of carbon dioxide fixation, where the end product, carbonate minerals, are stable for millions of years.
However, the following problems also exist:
(1) at home and abroad, the blast furnace slag after INBA cooling and granulation is heated and CO is added under the laboratory condition2Reaction, proceeding with CO2Carbonation, the method does not fully utilize the heat of the blast furnace slag, stays in a laboratory stage due to being uneconomical, and does not realize wide application;
(2) in recent years, attention has been continuously paid to the utilization of waste heat of blast furnace slag abroad, and it has been proposed to use blast furnace slag to promote the steam reforming of methane to produce synthesis gas, and the obtained high-temperature synthesis gas is subjected to methanol synthesis or used as a raw material for steel plants, but the method does not treat a large amount of CO generated in blast furnace ironmaking2；
(3) Domestic use of blast furnace top gas for CO removal2Recycling, removing CO2The method for manufacturing the methanol and the like has the problem that the carbon emission is transferred to the downstream industry.
Therefore, how to utilize abundant blast furnace slag resources, effectively accelerate mineral carbonization and develop a carbon dioxide sequestration technology with high benefit is more critical.
Disclosure of Invention
The invention aims to overcome the defects of the technology and provide a device and a method for separating carbon dioxide in blast furnace gas by using metallurgical slag, wherein CO is separated2Mineralization is beneficial to iron making, low carbon and emission reduction, the heat of the slag is directly utilized, and the energy conversion efficiency is improved.
In order to achieve the purpose, the device for separating carbon dioxide from blast furnace gas by using metallurgical slag comprises a blast furnace and a reactor, wherein a slag buffer tank is arranged above the reactor, a valve is arranged on a communication surface between the slag buffer tank and the reactor, the top of the blast furnace is connected with an ascending pipe, the ascending pipe is connected with a gas descending pipe, the gas descending pipe is communicated with the reactor through a first gas pipeline, the lower part of the blast furnace is provided with a slag runner, the slag runner is connected with the slag buffer tank through a slag pipeline, the lower end of the reactor is provided with a slag outlet, and the top of the reactor is connected with a tuyere of the blast furnace through a second gas pipeline.
Preferably, the slag buffer tank is provided with a material inlet, and a stirring device is arranged inside the slag buffer tank.
Preferably, a first gas analyzer is arranged on the first gas pipeline, a gas pressurization treatment station is arranged on the first gas pipeline, a blower device is arranged on the first gas pipeline to improve the dynamic conditions of the reaction, the first gas pipeline is horizontally inserted into the reactor, and the first gas pipeline is inserted into the reactor.
Preferably, the first gas pipeline is inserted into the reactor in a direction forming an included angle of less than 3 degrees with the horizontal plane, and the first gas pipeline is inserted into the reactor,
preferably, a gas desulfurization device is arranged on the second gas pipeline, and a second gas analyzer is arranged on the second gas pipeline.
Preferably, the slag buffer tank and the reactor adopt refractory linings and steel shells and are cooled by circulating water due to the fact that the high-temperature slag is above 1400 ℃.
The separation method of the device for separating the carbon dioxide from the blast furnace gas by using the metallurgical slag comprises the steps of introducing high-temperature liquid slag into a slag buffer tank from a slag ditch, opening a valve at the bottom of the slag buffer tank to enable the slag to enter the reactor after a preset amount of slag is stored in the slag buffer tank, introducing the blast furnace gas into the reactor through an ascending pipe, a gas descending pipe and a first gas pipeline in sequence, and reacting with the slag in the reactorShould, after reaction, be rich in CaCO3Is discharged from the slag outlet and then enters a subsequent INBA system for water cooling and granulation, and CO is separated2The blast furnace gas enters the blast furnace through the second gas pipeline to be used as indirect reducing gas in the blast furnace.
Preferably, the first gas pipeline is provided with a gas pressurization treatment station for pressurizing the blast furnace gas to make the pressure greater than CaCO3Decomposition pressure at high temperature.
The principle of the invention is as follows:
the blast furnace slag contains about 35% of CaO and about 10% of MgO, and CaO and MgO in the slag in a high-temperature liquid state are mainly CaO and SiO2、MgO·SiO2The compound exists, a small amount of CaO and MgO exists in a free state, and the steel slag contains a large amount of CaO and MgO in the free state.
CO in blast furnace gas composition2The reaction with the medium CaO of the slag under high temperature conditions is as follows:
the above reaction is a reversible reaction, CO in blast furnace gas2Partial pressure PCO2Greater than CaCO3The decomposition pressure at high temperature can be carried out rightwards, the melting point of calcium carbonate is 1339 ℃, and the calcium carbonate after reaction is dissolved in high-temperature liquid slag, so that a gas pressurization treatment station is arranged on the first gas pipeline to pressurize the blast furnace gas to ensure that the pressure is greater than CaCO3Decomposition pressure at high temperature.
Compared with the prior art, the invention has the following advantages:
1. introducing CO2Performing carbonation reaction with CaO at high temperature and certain pressure to obtain CO2Mineralization is beneficial to iron making, low carbon and emission reduction, and is equivalent to storing, burying and sealing CO2Or by using CO2The method has the advantages of environmental protection, permanence and the like due to the emission reduction mode of generating methanol and the like;
2. high-temperature liquid CO obtained after drum granulation of INBA2The heat of the slag is directly utilized for carbonation, so that the energy conversion efficiency is improved;
3. the treated blast furnace gas is used as reducing gas of the blast furnace, so that the indirect reduction reaction of the blast furnace can be improved, the economic index of the blast furnace is optimized, and the technology can be implemented in iron and steel enterprises, so that long-distance transportation is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to the present invention.
The components in the figures are numbered as follows:
the system comprises a blast furnace 1, a reactor 2, a slag buffer tank 3, a valve 4, an ascending pipe 5, a gas descending pipe 6, a first gas pipeline 7, a slag runner 8, a slag pipeline 9, a slag outlet 10, a second gas pipeline 11, a material inlet 12, a gas desulfurization device 13, a blast device 14, a first gas analyzer 15, a gas pressurization processing station 16 and a second gas analyzer 17.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, a device for separating carbon dioxide from blast furnace gas by using metallurgical slag comprises a blast furnace 1 and a reactor 2, wherein a slag buffer tank 3 is arranged above the reactor 2, a valve 4 is arranged on a communication surface between the slag buffer tank 3 and the reactor 2, the top of the blast furnace 1 is connected with an ascending pipe 5, the ascending pipe 5 is connected with a gas descending pipe 6, the gas descending pipe 6 is communicated with the reactor 2 through a first gas pipeline 7, the lower part of the blast furnace 1 is provided with a slag runner 8, the slag runner 8 is connected with the slag buffer tank 3 through a slag pipeline 9, the lower end of the reactor 2 is provided with a slag outlet 10, and the top of the reactor 2 is connected with a tuyere of the blast furnace 1 through a second gas pipeline 11.
In addition, in this embodiment, the slag buffer tank 3 is provided with a material inlet 12, and the slag buffer tank 3 is internally provided with a stirring device.
The first gas pipeline 7 is provided with a first gas analyzer 15, the first gas pipeline 7 is provided with a gas pressurization processing station 16, the first gas pipeline 7 is provided with a blower device 14, the first gas pipeline 7 is horizontally inserted into the reactor 2, and the first gas pipeline 7 is inserted into the reactor 2.
In other embodiments, the first gas conduit 7 may also be inserted into the reactor 2 at an angle of less than 3 degrees from the horizontal, and the first gas conduit 7 is inserted inside the reactor 2,
in this embodiment, a gas desulfurization device 13 is disposed on the second gas pipeline 11, and a second gas analyzer 17 is disposed on the second gas pipeline 11.
In this example, the slag buffer tank 3 and the reactor 2 are lined with refractory materials and made of steel, and are cooled by circulating water, because the high-temperature slag is above 1400 ℃.
In the embodiment, when the device for separating carbon dioxide from blast furnace gas by using metallurgical slag is used, high-temperature liquid slag is introduced into the slag buffer tank 3 from the slag runner 8, after a preset amount of slag is stored in the slag buffer tank 3, the valve 4 at the bottom of the slag buffer tank 3 is opened to enable the slag to enter the reactor 2, the blast furnace gas is introduced into the reactor 2 through the ascending pipe 5, the gas descending pipe 6 and the first gas pipeline 7 in sequence to react with the slag in the reactor 2, and after the reaction, the slag is rich in CaCO3The slag is discharged from the slag outlet 10 and then enters the subsequent INBA system for water cooling and granulation, and CO is separated2The blast furnace gas (2) is introduced into the blast furnace 1 through the second gas conduit 11 as an indirect reducing gas in the blast furnace 1.
Wherein, a gas pressurization treatment station 16 is arranged on the first gas pipeline 7 to pressurize the blast furnace gas to make the pressure greater than CaCO3Decomposition pressure at high temperature.
In addition, when the valve 4 is opened, the metallurgical slag flows into the reactor 2. Under normal conditions, the slag stored in the slag buffer tank 3 can keep enough liquid level to ensure that the reactor 2 communicated with the slag buffer tank 3 continuously reacts under the condition of keeping positive pressure, when the furnace condition of the blast furnace 1 is abnormal and the slag in the slag runner 8 is reduced, the liquid level in the slag buffer tank 3 is reduced, and at the moment, the valve 4 needs to be closed to ensure that the reactor 2 can still continuously react under the abnormal condition.
The blast furnace gas and CaO dissolved in the slag are subjected to carbonation reaction under the high temperature condition, and CO of the blast furnace gas after the reaction2The components are reduced to below 1 percent, and the blast furnace gas components contain N2、CO、H2，CO2And separating the inert gas and the reducing gas from the blast furnace gas. After reaction, is rich in CaCO3The slag is discharged from the slag outlet 10 and then enters the subsequent INBA system for water cooling and granulation. Has separated CO2The blast furnace gas (2) is introduced into the blast furnace 1 through the second gas conduit 11 as an indirect reducing gas in the blast furnace 1. Since the slag has a certain amount of sulfide gas volatilized, a gas desulfurization device 13 is provided.
In general, the blast furnace gas is introduced from the top of the blast furnace 1 into a high-temperature liquid slag (blast furnace slag or steel slag) in which alkali metals such as CaO and MgO and CO in the blast furnace gas are contained in a closed vessel2Reaction to adsorb and separate CO from blast furnace gas2So that CO is contained in the reacted coal gas2The content is reduced to below 1 percent.
The invention relates to a device for separating carbon dioxide in blast furnace gas by using metallurgical slag and a separation method thereof, which are used for separating CO2Performing carbonation reaction with CaO at high temperature and certain pressure to obtain CO2Mineralization is beneficial to iron making, low carbon and emission reduction, and is equivalent to storing, burying and sealing CO2Or by using CO2The method has the advantages of environmental protection, permanence and the like due to the emission reduction mode of generating methanol and the like; high-temperature liquid CO obtained after drum granulation of INBA2The heat of the slag is directly utilized for carbonation, so that the energy conversion efficiency is improved; the treated blast furnace gas is used as reducing gas of the blast furnace, so that the indirect reduction reaction of the blast furnace can be improved, the economic index of the blast furnace is optimized, and the technology can be implemented in iron and steel enterprises, so that long-distance transportation is reduced.
Claims (8)
1. An apparatus for separating carbon dioxide from blast furnace gas by using metallurgical slag, comprising a blast furnace (1), characterized in that: still include reactor (2), reactor (2) top is equipped with slag buffer tank (3), slag buffer tank (3) with be equipped with valve (4) on the intercommunication face between reactor (2), the top of blast furnace (1) even has tedge (5), tedge (5) even has coal gas downcomer (6), coal gas downcomer (6) through first gas conduit (7) with reactor (2) intercommunication, the lower part of blast furnace (1) is equipped with slag runner (8), slag runner (8) through slag conduit (9) with slag buffer tank (3) link to each other, the lower extreme of reactor (2) is equipped with slag outlet (10), the top of reactor (2) through second gas conduit (11) with the wind gap of blast furnace (1) is connected.
2. The apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 1, wherein: the slag buffer tank (3) is provided with a material inlet (12), and the slag buffer tank (3) is internally provided with a stirring device.
3. The apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 1, wherein: the reactor is characterized in that a first gas analyzer (15) is arranged on the first gas pipeline (7), a gas pressurization treatment station (16) is arranged on the first gas pipeline (7), an air blowing device (14) is arranged on the first gas pipeline (7), the first gas pipeline (7) is horizontally inserted into the reactor (2), and the first gas pipeline (7) is inserted into the reactor (2).
4. The apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 3, wherein: the first gas pipeline (7) is inserted into the reactor (2) in a direction forming an included angle smaller than 3 degrees with the horizontal plane, and the first gas pipeline (7) is inserted into the reactor (2).
5. The apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 1, wherein: and a gas desulfurization device (13) is arranged on the second gas pipeline (11), and a second gas analyzer (17) is arranged on the second gas pipeline (11).
6. The apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 1, wherein: the slag buffer tank (3) and the reactor (2) are made of refractory linings and steel shells and are cooled by circulating water.
7. A method for separating carbon dioxide from blast furnace gas using metallurgical slag according to claim 1, characterized by: introducing high-temperature liquid slag into the slag buffer tank (3) from the slag runner (8), opening a valve (4) at the bottom of the slag buffer tank (3) to enable the slag to enter the reactor (2) after a preset amount of slag is stored in the slag buffer tank (3), introducing blast furnace gas into the reactor (2) through the ascending pipe (5), the gas descending pipe (6) and the first gas pipeline (7) in sequence, reacting with the slag in the reactor (2), and after reaction, allowing the slag to be rich in CaCO3Is discharged from the slag outlet (10) and then enters a subsequent INBA system for water cooling and granulation, and CO is separated2The blast furnace gas enters the blast furnace (1) through the second gas pipeline (11) and is used as indirect reducing gas in the blast furnace (1).
8. The method according to claim 7, wherein the separation step comprises the steps of: a gas pressurization treatment station (16) is arranged on the first gas pipeline (7) and is used for pressurizing the blast furnace gas to ensure that the pressure is greater than CaCO3Decomposition pressure at high temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115354099A (en) * | 2022-09-15 | 2022-11-18 | 重庆中吉达环保科技有限公司 | Method for separating carbon dioxide in blast furnace gas from metallurgical slag |
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| CN110982966A (en) * | 2019-11-20 | 2020-04-10 | 中山大学 | Multi-stage recovery system and method for blast furnace slag and coal gas waste heat |
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| EP2589671A1 (en) * | 2011-11-04 | 2013-05-08 | Frank Werfel | Method and apparatus for integrating and using environmentally harmful carbon dioxide |
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