CN113230827A - Blast furnace gas trapping and recovering CO2Production method for converter steelmaking - Google Patents

Blast furnace gas trapping and recovering CO2Production method for converter steelmaking Download PDF

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Publication number
CN113230827A
CN113230827A CN202110425329.2A CN202110425329A CN113230827A CN 113230827 A CN113230827 A CN 113230827A CN 202110425329 A CN202110425329 A CN 202110425329A CN 113230827 A CN113230827 A CN 113230827A
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blast furnace
carbon dioxide
furnace gas
gas
recovering
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刘卫东
李建民
刘华平
陈景锋
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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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
    • 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
    • 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
    • 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
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • 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
    • B01D2252/20478—Alkanolamines
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention provides a method for recovering carbon dioxide from blast furnace gas, which comprises the following steps: (1) introducing blast furnace gas output from a blast furnace into an absorption tower; (2) in the absorption tower, alcohol amine adsorbent is adopted to absorb carbon dioxide in blast furnace gas to obtain pregnant solution; (3) and (4) sending the rich solution into a regeneration tower, desorbing and releasing carbon dioxide from the rich solution, and collecting the carbon dioxide after dehydration and pressurization. The method of the invention is low-cost and high-efficiency CO2The integrated technology of trapping, recovery and application is suitable for the application of steel production combined enterprises and used for trapping and recovering the produced CO from blast furnace gas2The gas can replace Ar to be used for smelting stainless steel and carbon steel to realize CO2Partial reutilization, energy conservation and emission reduction.

Description

Blast furnace gas trapping and recovering CO2Production method for converter steelmaking
Technical Field
The invention relates to the technical field of gas recycling and steel smelting, in particular to a method for capturing and recycling CO from blast furnace gas2A production method for converter steelmaking.
Background
According to the latest relevant data statistics, the carbon emission in the Chinese iron and steel industry is the third row after power generation and building material manufacturing, and accounts for about 15%. Therefore, the production and manufacturing process is optimized and CO is reduced2Emission and development of CO2The utilization of the new approach and the new method is a practical measure for realizing the national green development concept and is one of leading-edge subjects of the research of workers in the steel industry.
CO capture and recovery by using coal-fired power generation and lime calcining kiln tail gas as gas source2The technology is reported to be applied and researched, and the blast furnace gas is used as the raw material gas to capture and recover CO by adopting a chemical absorption method2And the application of converter steelmaking is not reported in research.
Disclosure of Invention
In view of the above problems, the main objects of the present invention are: provides a method for realizing CO inside iron and steel enterprises2The recycling method realizes energy conservation and carbon emission reduction in the steel manufacturing process.
Specifically, the invention is realized by the following technical scheme:
a method of recovering carbon dioxide from blast furnace gas, comprising the steps of:
(1) introducing blast furnace gas output from a blast furnace into an absorption tower;
(2) in the absorption tower, alcohol amine adsorbent is adopted to absorb carbon dioxide in blast furnace gas to obtain pregnant solution;
(3) and (4) sending the rich solution into a regeneration tower, desorbing and releasing carbon dioxide from the rich solution, and collecting the carbon dioxide after dehydration and pressurization.
Optionally, in the step (2), the temperature of the alkanolamine adsorbent is 30-50 ℃.
Optionally, in step (2), the blast furnace gas after carbon dioxide removal is collected as a high calorific value gas.
Optionally, in step (2), the alkanolamine adsorbent is any one or more of MEA, MDEA, DGA, DEA.
Optionally, in step (2), the concentration of the alkanolamine adsorbent is 45 wt% to 65 wt%.
Optionally, in step (2), the concentration of the alkanolamine adsorbent is 55 wt% to 60 wt%.
Optionally, in the step (3), the temperature in the regeneration tower is in a range of 110-130 ℃.
Optionally, in the step (3), the liquid after the carbon dioxide is released from the rich liquid is returned to the step (2) after being cooled.
Optionally, in the step (3), the liquid after the carbon dioxide is released from the rich liquid is cooled to 30-50 ℃ and then returns to the step (2).
Compared with the prior art, the blast furnace gas of the invention collects and recovers CO2The production method for converter steelmaking has at least the following beneficial effects:
(1) the early-stage capital construction investment is lower
The steel and iron united enterprises with blast furnace ironmaking and converter steelmaking factories all have ready-made blast furnace gas high-pressure pipe networks, which are convenient for leading out part of high-pressure blast furnace gas as raw material gas for CO2The capture and recovery can save part of capital investment.
(2) Increasing the heat value of the blast furnace gas
About 20% of CO originally contained in blast furnace gas2Does not participate in combustion reaction, but takes away part of heat to be discharged along with the flue gas. By adopting the production method of the invention, CO is removed2The CO content in the post-gas is increased from about 24 percent to about 28 percent, and the heat value is increased from 3.1MJ/Nm3Becomes 4.1MJ/Nm3And the quality and the heat value of the coal gas are improved.
(3)CO2High collecting and recovering efficiency, large treating capacity and low running cost
The invention adopts alcohol amine (such as MEA (ethanolamine), DEA (diethanolamine), DGA (diglycolamine) MDEA (methyldiethanolamine)) adsorbent, and realizes CO by controlling temperature2The product purity is up to more than 99.9 percent, the production efficiency is high, the processing capacity is large, and the operation cost is lower.
(4) Flow optimization, energy conservation and emission reduction
CO capture and recovery from blast furnace gas2After dehydration and pressurization treatment, the mixture is directly conveyed by a pipeline for converter steelmaking, thereby saving CO in an outsourcing mode2The gas is liquefied under pressure, transported and gasified again, CO2Replace Ar steelmaking and realize energy conservation and emission reduction.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
FIG. 1 is a schematic view of the present invention for capturing and recovering CO from blast furnace gas2A process flow diagram of a production method for converter steelmaking.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Aiming at a series of environmental problems caused by serious emission of carbon dioxide and the problem of high cost caused by large argon consumption in the steel smelting process, the inventor of the invention creatively and organically combines the two through research to design and develop a production method suitable for being applied to steel production united enterprises, and by adopting the method, the carbon dioxide can be collected and recovered from blast furnace gas with low cost and high efficiency, and the collected carbon dioxide can be used for smelting stainless steel and carbon steel by replacing argon to realize CO smelting2Partial reutilization, energy conservation and emission reduction.
The production process of the present invention will be described in detail with reference to FIG. 1.
The production method of the invention comprises the following steps:
(1) blast furnace gas is selected as a gas source of carbon dioxide, and blast furnace gas discharged from the blast furnace is introduced into the absorption tower.
Alternative gas sources include outsourcing CO2And collecting and recovering internal gas sources (such as lime kiln tail gas, blast furnace gas and heating furnace flue gas) of the iron and steel enterprises.
The factors of air source price, supply stability, recovery process adaptability, recovery cost, daily operation cost, economic and social benefits and the like are comprehensively considered, and the self-produced blast furnace gas has gasSource stable, CO2High content, ready-made high-pressure gas supply pipe network, and CO extraction2The quality of the post-gas is improved, and the like, so that the blast furnace gas is selected as CO2A raw material gas source.
A certain amount of coal gas is separated from a blast furnace coal gas main pipe, washed by water and dedusted, and then enters an absorption tower. The amount of the separated gas can be determined by those skilled in the art according to the required amount of carbon dioxide, and will not be described herein.
(2) In the absorption tower, alcohol amine adsorbent is used to absorb carbon dioxide in blast furnace gas.
In this step, the alkanolamine adsorbent may be any one or more of MEA (ethanolamine), MDEA (methyldiethanolamine), DGA (diglycolamine), DEA (diethanolamine).
Aiming at different gas sources and product purposes, the industrialized CO is realized at present2The trapping and recovering technology mainly comprises an absorption separation method (wet method) and an adsorption separation method (dry method), and the process characteristics and the application range are shown in the following table 1.
TABLE 1
Figure BDA0003029501230000041
By comparing the advantages and disadvantages of the wet process and the dry process, the inventors finally chose to employ an absorption separation process (i.e., wet process) to capture carbon dioxide in blast furnace gas, specifically a chemical absorption process. The inventor improves the alcohol amine adsorbent used for capturing the carbon dioxide in the blast furnace gas, and the adsorbent can select different combinations of MEA + MDEA, MDEA + DGA, MDEA + DEA, MEA + DEA and the like as basic components and proper concentration ratio according to the initial condition of raw gas and the requirement of product gas so as to meet the special process requirements of reducing pipeline corrosion, reducing adsorbent consumption, improving absorption efficiency and the like.
In this step, the concentration of the alkanolamine adsorbent may be 45 wt% to 65 wt%, preferably 55 wt% to 60 wt%. As a preferred example, the alkanolamine adsorbent may be used in a specific combination of:
a combination of MEA at a concentration of 25, 26, 27, 28, 29, 30, 3, 32, 33, 34, or 35 wt% and MDEA at a concentration of 25, 26, 27, 28, 29, 30, 3, 32, 33, 34, or 35 wt%;
a combination of MDEA at a concentration of 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 3 wt%, 32 wt%, 33 wt%, 34 wt%, or 35 wt% and DGA at a concentration of 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 3 wt%, 32 wt%, 33 wt%, 34 wt%, or 35 wt%;
a combination of MDEA at a concentration of 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 3 wt%, 32 wt%, 33 wt%, 34 wt%, or 35 wt% and DEA at a concentration of 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 3 wt%, 32 wt%, 33 wt%, 34 wt%, or 35 wt%;
a combination of MEA at a concentration of 25, 26, 27, 28, 29, 30, 3, 32, 33, 34, or 35 wt.% and DEA at a concentration of 25, 26, 27, 28, 29, 30, 3, 32, 33, 34, or 35 wt.%.
It should be noted that, in this specification, each of the concentrations described above refers to the concentration of the corresponding substance in the aqueous alkanolamine adsorbent solution.
By means of the combined alcohol amine adsorbent, the special process requirements of reducing pipeline corrosion, reducing adsorbent consumption, improving absorption efficiency and the like can be particularly met.
In the step, the alcohol amine solution with the temperature controlled between 30 and 50 ℃ in the absorption tower absorbs CO in the blast furnace gas2Absorption of CO2The later alcohol amine solution is called rich solution, and CO is completed2And (4) trapping.
In this step, the following chemical reactions mainly take place:
Figure BDA0003029501230000051
the forward reaction of the formula I is faster at 30-50 ℃,CO2is absorbed to thereby realize CO2And (4) trapping.
Preferably, CO is removed2And the rest of the blast furnace gas after dehydration treatment returns to the blast furnace gas main pipe to be collected as the blast furnace gas with high heat value and high quality.
(3) And (4) sending the rich solution into a regeneration tower, desorbing and releasing carbon dioxide from the rich solution, and collecting the carbon dioxide after dehydration and pressurization.
Absorption of CO2The rich solution enters a regeneration tower and is heated to 110-130 ℃ (for example 110 ℃), at the moment, the reaction of the formula I is carried out reversely, and CO is obtained2CO released and separated out by analysis2After dehydration and pressurization, the mixture enters into CO2And collecting by using a gas storage tank. Collected CO2The alloy can be used for smelting carbon steel and stainless steel in a converter instead of Ar, and a specific application method can be reasonably selected by a person skilled in the art according to the actual production condition, and is not described herein any more.
Preferably, the rich liquid releases CO2And the obtained lean solution is subjected to heat exchange and temperature reduction to 30-50 ℃, and is regenerated into an alcohol amine solution, and the alcohol amine solution returns to the absorption tower to enter the next absorption process.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
(1) Dust removal of raw gas
The feed gas used in this example was blast furnace gas having a pressure of about 15Kpa and the composition is shown in table 2.
TABLE 2
Figure BDA0003029501230000061
Branch gas is branched from a main blast furnace gas pipeline with the flow rate of 600Nm3Min (split flow according to CO)2Product demand adjustment), washing with water to remove dust, introducing into a heat exchanger to remove heatAdjusting the temperature to about 30-40 ℃, and feeding the mixture into an inlet at the bottom end of the absorption tower.
(2)CO2Trapping
Raw material blast furnace gas enters from the bottom end of an absorption tower and generates CO with an alcohol amine adsorbent (MDEA (23 wt%) + DEA (35 wt%) aqueous solution in the absorption tower, namely in the alcohol amine adsorbent solution, the concentration of the MDEA is 23 wt%, the concentration of the DEA is 35 wt%, and the temperature is about 30-35 DEG C2And (3) performing adsorption reaction, wherein the molar ratio of the alcohol amine melt to the blast furnace gas is 1: 1.2. And collecting the alcohol amine rich solution after adsorbing CO2 to the bottom end of the absorption tower, and pumping the alcohol amine rich solution to the inlet end of the regeneration tower. The net blast furnace gas after CO2 removal is discharged from the top end of the absorption tower and returns to a blast furnace gas main pipe;
CO removal2The composition of the purified gas is shown in Table 3.
TABLE 3
Figure BDA0003029501230000071
(3)CO2Resolution and regeneration of alcohol amine liquid
Absorption of CO2The alcohol amine rich solution enters the inlet end of a regeneration tower, the temperature is gradually increased to 110-130 ℃, and CO is generated2Carrying out desorption reaction, releasing CO from rich solution2And collecting the lean solution to the bottom end of the regeneration tower, reducing the temperature to 30-40 ℃ through a heat exchanger, returning to the absorption tower, and starting the next cycle.
(4)CO2For steelmaking applications
Resolved CO2And discharging the dehydrated and pressurized gas to 20-22 Kpa from the top end of the regeneration tower for use as the bottom blowing stirring gas for converter steelmaking.
CO for converter steelmaking2The product gas composition requirements are shown in table 4.
TABLE 4
Main component CO2 N2 O2 H2O
By volume content of% ＞99.5 0.04～0.05 ＜15ppm ＜100ppm
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.

Claims (9)

1. A method of recovering carbon dioxide from blast furnace gas, comprising the steps of:
(1) introducing blast furnace gas output from a blast furnace into an absorption tower;
(2) in the absorption tower, alcohol amine adsorbent is adopted to absorb carbon dioxide in blast furnace gas to obtain pregnant solution;
(3) and (4) sending the rich solution into a regeneration tower, desorbing and releasing carbon dioxide from the rich solution, and collecting the carbon dioxide after dehydration and pressurization.
2. The method for recovering carbon dioxide from blast furnace gas according to claim 1, wherein in the step (2), the temperature of the alkanolamine adsorbent is 30 to 50 ℃.
3. The method for recovering carbon dioxide from blast furnace gas according to claim 1, wherein in the step (2), the blast furnace gas after carbon dioxide removal is collected as high calorific value gas.
4. The method for recovering carbon dioxide from blast furnace gas according to claim 1, wherein in the step (2), the alkanolamine adsorbent is any one or more of MEA, MDEA, DGA and DEA.
5. The method for recovering carbon dioxide from blast furnace gas according to claim 1, wherein the concentration of the alkanolamine adsorbent in step (2) is 45 to 65 wt%.
6. The method for recovering carbon dioxide from blast furnace gas according to claim 5, wherein in step (2), the concentration of the alkanolamine adsorbent is 55 to 60 wt%.
7. The method for recovering carbon dioxide from blast furnace gas according to claim 1, wherein in the step (3), the temperature in the regeneration tower is in a range of 110 to 130 ℃.
8. The method for recovering carbon dioxide from blast furnace gas according to claim 1, characterized in that in step (3), the liquid after the rich liquid releases carbon dioxide is returned to step (2) after being cooled.
9. The method for recovering carbon dioxide from blast furnace gas according to claim 8, wherein in step (3), the temperature of the liquid after the rich liquid releases carbon dioxide is reduced to 30 to 50 ℃, and then the liquid is returned to step (2).
CN202110425329.2A 2021-04-20 2021-04-20 Blast furnace gas trapping and recovering CO2Production method for converter steelmaking Pending CN113230827A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2895273A1 (en) * 2005-12-22 2007-06-29 Inst Francais Du Petrole Deacidifying gaseous effluents, e.g. natural, synthesis or flue gas, by scrubbing with absorbent solution forming two separate phases on absorption, reducing energy required for regeneration of absorbent
CN104492226A (en) * 2014-12-12 2015-04-08 大连理工大学 Non-aqueous decarburization solution for capturing carbon dioxide in mixed gas and application thereof
CN112126477A (en) * 2020-09-17 2020-12-25 安徽工业大学 Carbon dioxide capture system and method based on blast furnace slag washing water waste heat recycling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2895273A1 (en) * 2005-12-22 2007-06-29 Inst Francais Du Petrole Deacidifying gaseous effluents, e.g. natural, synthesis or flue gas, by scrubbing with absorbent solution forming two separate phases on absorption, reducing energy required for regeneration of absorbent
CN104492226A (en) * 2014-12-12 2015-04-08 大连理工大学 Non-aqueous decarburization solution for capturing carbon dioxide in mixed gas and application thereof
CN112126477A (en) * 2020-09-17 2020-12-25 安徽工业大学 Carbon dioxide capture system and method based on blast furnace slag washing water waste heat recycling

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Title
张龙等编著: "《绿色化学》", 31 August 2014, 华中科技大学出版社 *
祁贵生等编著: "《超重力湿式脱除气体中硫化氢技术》", 31 December 2013, 国防工业出版社 *
董仁杰等编著: "《沼气工程与技术 第3卷》", 31 August 2013, 中国农业大学出版社 *

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