CN114836247A - Ultralow-emission low-carbon cooperative control method for deep purification of blast furnace gas in steel industry - Google Patents
Ultralow-emission low-carbon cooperative control method for deep purification of blast furnace gas in steel industry Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000746 purification Methods 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 7
- 239000010959 steel Substances 0.000 title claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 60
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 20
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 18
- 239000011593 sulfur Substances 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims abstract description 17
- 125000001741 organic sulfur group Chemical group 0.000 claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 6
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 150000007524 organic acids Chemical class 0.000 claims abstract description 5
- 239000002737 fuel gas Substances 0.000 claims abstract description 4
- 238000001179 sorption measurement Methods 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 239000012629 purifying agent Substances 0.000 claims description 10
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 12
- 150000003568 thioethers Chemical class 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- CPGKMLVTFNUAHL-UHFFFAOYSA-N [Ca].[Ca] Chemical compound [Ca].[Ca] CPGKMLVTFNUAHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/32—Purifying combustible gases containing carbon monoxide with selectively adsorptive solids, e.g. active carbon
-
- 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)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A method for the ultralow-emission low-carbon cooperative control of deep purification of blast furnace gas in the steel industry comprises the following steps: (1) blast furnace gas from a blast furnace enters a dry bag dust collector to form a material flow I; (2) the material flow I enters an advanced pretreatment process unit, and a material flow II is formed after dust impurities, hydrogen chloride, organic acid and other substances are removed; (3) the material flow II enters an organic sulfur deep purification process unit to convert organic sulfur into inorganic sulfur to form a material flow III; (4) the material flow III enters an inorganic sulfur deep purification process unit, and inorganic sulfur is removed to form a material flow IV; (5) the material flow VI enters a TRT device to form a material flow V; (6) the material flow V absorbs carbon dioxide and utilizes a process unit to absorb the carbon dioxide in the blast furnace gas to form a material flow VI; (7) stream vi enters an ultra low emission process unit to ultimately obtain fuel gas and recover carbon dioxide. The invention solves the problems that the removal of sulfides in the blast furnace gas purification does not reach the standard, and the carbon dioxide in the blast furnace gas is not recycled.
Description
Technical Field
The invention mainly relates to the field of environmental protection, energy conservation and emission reduction, in particular to a synergistic process flow for purifying ultralow emission such as desulfurization, carbon dioxide and the like in blast furnace gas.
Background
In 2019, the carbon emission amount of the Chinese iron and steel industry accounts for more than 60% of the total carbon emission amount of the global iron and steel, accounts for about 15% of the total carbon emission amount of the whole country, is the manufacturing industry with the highest carbon emission amount in China, and is the greatest importance of carbon emission reduction. In the field of ferrous metallurgy, blast furnace gas, which is combustible gas with low calorific value and is a byproduct in the blast furnace ironmaking process, is large in blast furnace gas quantity, and the typical volume percentage of the blast furnace gas comprises 22-27% of CO and 22-27% of CO 2 13-19% of H 2 1-4% of CH 4 02-0.4% of N 2 Accounts for 54 to 58 percent, and the comprehensive utilization ways of blast furnace gas mainly comprise: (1) as a fuel; (2) for generating electricity; (3) recovery of CO and CO 2 . Therefore, the recovery and utilization of blast furnace gas have higher economic and environmental benefits, but the blast furnace gas contains harmful substances such as dust, chlorine, sulfur and the like, and can be utilized only after the blast furnace gas is subjected to comprehensive purification treatment.
The existing blast furnace gas is mainly applied by removing particulate matters through gravity and bag type dust removal, and then is sent to a blast furnace hot blast stove, a steel rolling heating furnace, a coal gas power generation and other dispersed user units to be used as fuel after TRT (blast furnace top pressure recovery turbine) residual pressure power generation, but harmful substances such as sulfur, chlorine and the like contained in the blast furnace gas are not treated. The process flow has the greatest characteristics that the radial flow reactor, five process units and four novel purifying materials are adopted, the problem that the blast furnace gas is difficult to directly discharge due to high pollution caused by high sulfur content is solved by the advantages of low cost, long service life, environmental protection, safety and high efficiency, and the problem of emission reduction and utilization of carbon dioxide in the blast furnace gas discharge process is solved at the same time.
Disclosure of Invention
The invention aims to provide a synergistic control process flow for deep purification and ultralow emission of blast furnace gas, which adopts a radial flow reactor to treat blast furnace gas containing sulfur, carbon dioxide and other components in five process units, finally realizes ultralow emission of the blast furnace gas, and simultaneously recovers valuable resources of CO 2 A gas.
The purpose of the invention is realized as follows: the method comprises the following steps of treating blast furnace gas by a dry bag-type dust collector, and then performing advanced pretreatment process unit device, organic sulfur advanced purification process unit device, inorganic sulfur advanced purification process unit device, carbon dioxide adsorption utilization process unit device and ultralow emission process unit device on the blast furnace gas, wherein the method comprises the following steps:
the method comprises the following steps: and (4) performing dust removal treatment on the blast furnace gas by a dry bag-type dust remover.
Step two: and conveying the blast furnace gas treated by the dry bag-type dust remover to an advanced pretreatment process unit. And conveying the blast furnace gas treated by the dry bag-type dust remover to an advanced pretreatment unit. The unit can remove dust impurities, substances containing hydrogen chloride, organic acid and the like, and prevents the subsequent working section from being influenced by dust and acidic substances. In order to ensure the pretreatment effect of the process unit and reduce the pressure drop loss, a radial flow fixed bed reactor and a pretreatment purifying agent for efficiently removing impurities, organic acid and hydrogen chloride are adopted.
Step three: and (3) conveying the blast furnace gas subjected to deep pretreatment to an organic sulfur deep purification process unit. The unit can convert organic sulfur with complex form in blast furnace gas into inorganic sulfur, and in order to ensure the depth of organic sulfur purification and reduce pressure drop loss, the process unit adopts a radial flow fixed bed reactor and a special crystal type efficient organic sulfur hydrolysis purifying agent.
Step four: and (4) conveying the blast furnace gas passing through the organic sulfur deep purification process unit to an inorganic sulfur deep purification process unit. The unit adopts a dry desulfurization and radial flow fixed bed reactor and a high-sulfur-capacity high-removal-rate, high-sulfur-capacity, high-removal-rate, and calcium-calcium mixed fine targeting fine-calcium.
Step five: and conveying the blast furnace gas subjected to the desulfurization deep purification process unit to a TRT device. The blast furnace gas residual pressure recovery turbine power generation device (TRT for short) is a secondary energy recovery device, can introduce gas into a turbine expansion machine for acting before a pressure reducing valve, and can convert heat energy and pressure energy of the gas into mechanical energy to be used as driving force for power generation of a generator, thereby better achieving the effect of recovering energy.
Step six: the blast furnace gas after deep purification and desulfurization enters a dry-method carbon dioxide adsorption device, and the carbon dioxide in the desulfurized blast furnace gas is effectively purified and adsorbed out for independent use by utilizing the principle that different adsorbents do not use different adsorption amounts of different components in the blast furnace gas under the pressure condition, thereby avoiding disordered discharge of the carbon dioxide.
Step seven: the blast furnace gas obtained after deep purification and adsorption purification of the front unit completely meets the national environmental protection requirements and can be directly discharged, and the blast furnace gas can be used as fuel gas due to high calorific value, and the adsorption and purification of carbon dioxide products are carried out in many directions.
The overall advantages of the process flow of the blast furnace gas deep purification ultralow emission cooperative control technology are as follows:
(1) high purification degree, good selectivity to hydrogen chloride and certain adsorption energy to organic chlorine in the raw materials; the chlorine capacity is high, and the service life is long; the formula is safe and clean, and the toxic metal component is not contained, so that the poisoning and inactivation of the downstream hydrolysis catalyst can not be caused.
(2) The organic sulfur conversion rate is high, aiming at the characteristics of high organic sulfur content and complex form of blast furnace gas, a deep conversion process is adopted, and an alkali metal active component is adopted as an organic sulfur deep purification catalyst, so that the conversion efficiency is high and is more than 90 percent; the strength is high, and the pulverization is not easy; has strong corrosion resistance to toxic substances such as oxygen, extremely slow performance decay and long service life.
(3) The process flow is economical, energy-saving and efficient, the temperature and the pressure of blast furnace gas can be fully utilized by deep conversion before TRT, the flow velocity of a catalyst bed layer is reduced, the pressure drop loss is reduced, the energy consumption is saved, and meanwhile, the cold and hot diseases that the temperature is reduced for dehydration and then the temperature is raised for hydrolysis after TRT hydrolysis can be avoided.
(4) The device is simple, convenient, quick and reliable, occupies small area, has less investment, and has stable operation and high reliability. The device has low production cost and low maintenance cost, and does not need newly-increased post operators.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
A blast furnace gas deep purification ultralow emission cooperative control process flow comprises the following steps:
in the first step, dust is removed from blast furnace gas by a dry bag-type dust collector.
And in the second step, the blast furnace gas in the first step is treated in a deep pre-treatment process unit to eliminate dust, impurity, hydrogen chloride, organic acid and other matters, and the unit adopts a radial flow fixed bed reactor and an organic sulfur hydrolyzing and purifying agent.
And thirdly, the blast furnace gas in the second step is converted into inorganic sulfur by an organic sulfur deep purification process unit, and the unit adopts a radial flow fixed bed reactor and a special crystal type efficient organic sulfur hydrolysis purifying agent.
And fourthly, removing inorganic sulfur from blast furnace gas in a third step by an inorganic sulfur deep purification process unit, wherein the unit adopts a dry desulfurization and radial flow fixed bed reactor and a high-sulfur-capacity high-removal-rate, high-performance, high-sulfur-capacity, high-particle-state, inorganic sulfur targeted and fine desulfurization purifying agent.
And fifthly, conveying the blast furnace gas in the fourth step to a TRT device through a desulfurization deep purification process unit.
And sixthly, adsorbing the blast furnace gas in the fifth step by using a carbon dioxide adsorption process unit to adsorb carbon dioxide in the blast furnace gas, wherein the unit adopts a dry adsorption PSA process and an amorphous carbon dioxide pressure swing adsorption purifying agent.
And seventhly, obtaining fuel gas and recovering carbon dioxide from the blast furnace gas in the sixth step through an ultra-low emission process unit.
Claims (1)
1. A method for the ultralow-emission low-carbon cooperative control of deep purification of blast furnace gas in the steel industry comprises the following steps:
firstly, removing dust from blast furnace gas by a dry bag-type dust remover;
secondly, removing dust impurities, hydrogen chloride and organic acid-containing substances from the blast furnace gas obtained in the first step by using an advanced pretreatment process unit, wherein the unit adopts a radial flow fixed bed reactor and a pretreatment purifying agent;
thirdly, converting the organic sulfur in the blast furnace gas obtained in the second step into inorganic sulfur by an organic sulfur deep purification process unit, wherein the unit adopts a radial flow fixed bed reactor and an organic sulfur hydrolysis purifying agent;
fourthly, removing inorganic sulfur from the blast furnace gas obtained in the third step through an inorganic sulfur deep purification process unit, wherein the unit adopts dry desulfurization, and adopts a radial flow fixed bed reactor and an inorganic sulfur desulfurization purifying agent;
fifthly, passing the blast furnace gas obtained in the fourth step through a desulfurization deep purification process unit and then through a TRT power generation device;
sixthly, adsorbing the carbon dioxide in the blast furnace gas obtained in the fifth step by using a carbon dioxide adsorption process unit, wherein the unit adopts a dry adsorption process and a carbon dioxide adsorption purifying agent;
and seventhly, obtaining fuel gas and recycling carbon dioxide from the blast furnace gas obtained in the sixth step through an ultra-low emission process unit.
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| CN202210500257.8A CN114836247A (en) | 2022-05-06 | 2022-05-06 | Ultralow-emission low-carbon cooperative control method for deep purification of blast furnace gas in steel industry |
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| CN202210500257.8A CN114836247A (en) | 2022-05-06 | 2022-05-06 | Ultralow-emission low-carbon cooperative control method for deep purification of blast furnace gas in steel industry |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018071894A (en) * | 2016-10-31 | 2018-05-10 | Ｊｆｅスチール株式会社 | Method for separating and recovering hydrogen from blast furnace gas, method for producing hydrogen, and separation and recovery system of hydrogen from blast furnace gas |
| CN109609202A (en) * | 2019-01-17 | 2019-04-12 | 武汉禾谷环保有限公司 | A kind of blast furnace gas desulfurizing and purifying method |
| CN111334341A (en) * | 2020-03-16 | 2020-06-26 | 山东洲蓝环保科技有限公司 | Method for desulfurizing blast furnace gas |
| CN111534335A (en) * | 2020-03-25 | 2020-08-14 | 南京中电环保科技有限公司 | Blast furnace gas hydrolysis and dry-process fine desulfurization treatment system and method |
| CN112915777A (en) * | 2019-12-05 | 2021-06-08 | 武汉科林化工集团有限公司 | Blast furnace gas dechlorination, desulfurization and purification process |
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2022
- 2022-05-06 CN CN202210500257.8A patent/CN114836247A/en active Pending
Patent Citations (7)
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