CN208302474U - The preparation system of carbon dioxide is extracted using steel-making lime kiln exhaust gas - Google Patents

The preparation system of carbon dioxide is extracted using steel-making lime kiln exhaust gas Download PDF

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CN208302474U
CN208302474U CN201820435186.7U CN201820435186U CN208302474U CN 208302474 U CN208302474 U CN 208302474U CN 201820435186 U CN201820435186 U CN 201820435186U CN 208302474 U CN208302474 U CN 208302474U
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outlet
liquid
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carbon dioxide
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杨楚荣
张凌义
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Beijing Shougang International Engineering Technology Co Ltd
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Beijing Shougang International Engineering Technology Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

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Abstract

A kind of preparation system extracting carbon dioxide using steel-making lime kiln exhaust gas, belongs to admixture of gas separation technology field, comprising: concentration unit, purifying plant and storage device；The CO of concentration unit2The CO of outlet conduit and purifying plant2Inlet pipeline connection, the CO of purifying plant2The CO of outlet conduit and storage device2Inlet pipeline connection.Concentration unit uses two sections of psa units, and carbon dioxide intermediate products Gas content about 95%, after purifying using purifying plant, carbon dioxide finished product Gas content reaches 99.9% or more.Advantage is: extracting carbon dioxide progress resource utilization from limekiln exhaust gas for steel plant and provides a kind of technical solution, using two stage pressure swing adsorptions and purification technique, the carbon dioxide content of preparation reaches 99.9% or more, with oxygen mix using safe, does not influence steel quality；It is generated in preparation process without waste water, exhaust gas, clean and environmental protection.

Description

The preparation system of carbon dioxide is extracted using steel-making lime kiln exhaust gas
Technical field
The utility model belongs to admixture of gas separation technology field, in particular to a kind of to be mentioned using steel-making lime kiln exhaust gas Take the preparation system of carbon dioxide.
Background technique
CO at present2Growing discharge makes global warming have become the focal issue that international community must face, The annual CO of metallurgy industry2Discharge amount ratio accounts for the 30.4% of industrial total release, and metallurgy industry undoubtedly becomes CO2Rich and influential family is discharged, Therefore research and development CO2Recovery and utilization technology have become the urgent needs of steel industry energy-saving and emission-reduction.At present to this technology Research and application, be included in national science and technology support items, it is domestic in recent years just to set about carrying out Demonstration And Extension carbon dioxide and oxygen Gas mixing is applied to converter smelting mixed injection, converter dephosphorization of molten iron pre-processes mixed injection, converter vanadium extraction from hot metal mixed injection Deng these researchs and application are all that blowing improves converter smelting effect into high temperature liquid iron after mixing carbon dioxide and oxygen Fruit and energy-saving.But how economical from steel plant's exhaust gas to close extensive extract in ground and prepare high-purity carbon dioxide and have become Metallurgy industry Resources of Carbon Dioxide utilizes the technical problem faced at present.
Summary of the invention
The purpose of this utility model is to provide it is a kind of using steel-making lime kiln exhaust gas extract carbon dioxide preparation system, Carbon dioxide progress resource utilization is extracted from limekiln exhaust gas for steel plant, technology solution route is provided.Its technology solution party Case is: the exhaust gas after steel-making lime kiln deduster, after gaseous effluent cools, using two sections of pressure-variable adsorption skills Art and purification technique prepare the high-purity carbon dioxide of 99.9% or more content, which is dry purification process, in the process without useless Water, exhaust gas generate, clean and environmental protection.
The utility model includes: concentration unit, purifying plant and storage device, the CO of concentration unit2Outlet conduit with mention The CO of pure device2Inlet pipeline connection, the CO of purifying plant2The CO of outlet conduit and storage device2Inlet pipeline connection.Concentrate Device use two sections of psa units, carbon dioxide intermediate products Gas content about 95%, after being purified using purifying plant, two Carbonoxide finished product Gas content reaches 99.9% or more.
The concentration unit includes: gaseous effluent, the first supercharger, the first moisture trap, the suction of first segment transformation Attached tower, intermediate gas tank, the second supercharger, the second moisture trap, second segment pressure-swing absorber, intermediate products gas tank, compressor And oil-sealed rotary pump.The import of exhaust piping and gaseous effluent from limekiln connects, the outlet of gaseous effluent and the The import of one supercharger connects, and the outlet of the first supercharger is connect with the import of the first moisture trap, the first moisture trap Outlet connect with the import/export of first segment pressure-swing absorber, the import/export of first segment pressure-swing absorber and intermediate gas tank Import connection, the outlet of intermediate gas tank are connect with the import of the second supercharger, the outlet of the second supercharger and the second gas-water separation The import of device connects, and the outlet of the second moisture trap is connect with the import of second segment pressure-swing absorber, second segment pressure-variable adsorption The outlet of tower is connect with the import of intermediate products gas tank, and the outlet of intermediate products gas tank and the import of compressor connect.It is mechanical true Sky pump is connect with the import/export of the import/export of first segment pressure-swing absorber and second segment pressure-swing absorber respectively.
Oil-sealed rotary pump is for vacuumizing, the dioxy that will be adsorbed in first segment pressure-swing absorber and second segment pressure-swing absorber Change carbon to desorb；
The purifying plant includes: forecooler, purifying column, subcooler and ice maker.The compressor in concentration unit CO2Outlet is connect with the import of forecooler, and the outlet of forecooler and the import of purifying column connect, the outlet of purifying column and subcooler Import connection.Ice maker is connect with forecooler and subcooler respectively.
Into forecooler and cross condenser carbon dioxide by with ice maker come liquefied ammonia heat exchange and be cooled and liquefied.
The storage device includes: liquid CO2Storage tank, liquid CO2Force (forcing) pump, liquid CO2Gasifier and gas CO2Ball Tank.The CO of subcooler in purifying plant2Outlet and liquid CO2The import of storage tank connects, liquid CO2The outlet of storage tank and liquid Body CO2The import of force (forcing) pump connects, liquid CO2The outlet of force (forcing) pump and liquid CO2The import of gasifier connects, liquid CO2Gasification The outlet of device and liquid CO2The import of gasifier connects, liquid CO2The outlet of gasifier and gas CO2The import of spherical tank connects.
The preparation system, psa unit use two sections of preparation systems, and carbon dioxide intermediate products Gas content is about 95%, after purifying using purifying plant, carbon dioxide finished product Gas content reaches 99.9% or more.
Utility model has the advantages that extracting carbon dioxide from limekiln exhaust gas for steel plant carries out resource utilization A kind of technical solution is provided, using two stage pressure swing adsorptions and purification technique, the carbon dioxide content of preparation reaches 99.9% or more, with oxygen mix using safe, do not influence steel quality；It is generated in preparation process without waste water, exhaust gas, wiper ring It protects.
Detailed description of the invention
Fig. 1 is the carbon dioxide preparation flow schematic diagram of the utility model, wherein concentration unit 1, purifying plant 2, storage Device 3.
Specific embodiment
Fig. 1 is a kind of specific embodiment of the utility model.
Exhaust gas is derived from steel-making lime sleeve kiln, CO in lime sleeve kiln exhaust gas2Content is 25% (average value), carbon dioxide Year preparative-scale is 50,000 tons/year.
Carbon dioxide preparation system composition includes: concentration unit 1, purifying plant 2 and storage device 3.Concentration unit 1 CO2The CO of outlet conduit and purifying plant 22Inlet pipeline connection, the CO of purifying plant 22Outlet conduit and the storage fill Set 3 CO2Inlet pipeline connection.
Concentration unit 1 include: gaseous effluent, the first supercharger, the first moisture trap, first segment pressure-swing absorber, Intermediate gas tank, the second supercharger, the second moisture trap, second segment pressure-swing absorber, intermediate products gas tank, compressor and machinery Vacuum pump.The import of exhaust piping and gaseous effluent from limekiln connects, the outlet of gaseous effluent and the first pressurization The import of machine connects, and the outlet of the first supercharger is connect with the import of the first moisture trap, the outlet of the first moisture trap It is connect with the import/export of first segment pressure-swing absorber, the import of the import/export of first segment pressure-swing absorber and intermediate gas tank connects Connect, the outlet of intermediate gas tank connect with the import of the second supercharger, the outlet of the second supercharger and the second moisture trap into Mouth connection, the outlet of the second moisture trap are connect with the import of second segment pressure-swing absorber, and second segment pressure-swing absorber goes out Mouth is connect with the import of intermediate products gas tank, and the outlet of intermediate products gas tank and the import of compressor connect.Oil-sealed rotary pump point It is not connect with the import/export of the import/export of first segment pressure-swing absorber and second segment pressure-swing absorber.
Further, oil-sealed rotary pump, will be in first segment pressure-swing absorber and second segment pressure-swing absorber for vacuumizing The carbon dioxide of absorption comes out；
Purifying plant 2 includes: forecooler, purifying column, subcooler and ice maker.The CO of compressor in concentration unit 12 Outlet is connect with the import of forecooler, the outlet of forecooler and the import of purifying column connection, the outlet of purifying column and subcooler Import connection.Ice maker is connect with forecooler and subcooler respectively.
Further, into forecooler and cross condenser carbon dioxide by with ice maker come liquefied ammonia exchange heat and be cooled and Liquefaction.
Storage device 3 includes: liquid CO2Storage tank, liquid CO2Force (forcing) pump, liquid CO2Gasifier and gas CO2Spherical tank.Come From the CO of subcooler in purifying plant 22Outlet and liquid CO2The import of storage tank connects, liquid CO2The outlet of storage tank and liquid CO2 The import of force (forcing) pump connects, liquid CO2The outlet of force (forcing) pump and liquid CO2The import of gasifier connects, liquid CO2Gasifier Outlet and liquid CO2The import of gasifier connects, liquid CO2The outlet of gasifier and gas CO2The import of spherical tank connects.
Further, preparation system psa unit uses two sections of preparation systems, carbon dioxide intermediate products Gas content About 95%, after purifying using purifying plant, carbon dioxide finished product Gas content reaches 99.9% or more.
Carbon dioxide preparation system process flow is as follows:
1) exhaust gas after steel-making lime sleeve kiln deduster is with~14000Nm3The flow of/h, in pressure~800Pa It is lower to enter CO2Preparation system battery limit (BL) is cooled down by gaseous effluent first, is then pressurized to 0.12MPa through the first supercharger, is passed through After crossing the first moisture trap removing free water, into first segment pressure-swing absorber；
2) the lime sleeve kiln exhaust gas without free water enters adsorption bed from the bottom of first segment pressure-swing absorber, is adsorbing Under conditions of agent selection absorption, the carbon dioxide adsorption in lime-kiln gas is got off, unadsorbed remaining gas is arranged from tower top It goes out to be vented, when being adsorbed CO2Concentration forward position close to bed export when, close first segment pressure-swing absorber gaseous mixture air inlet Valve and outlet air valve, make it stop absorption, by 4 equal pressure drops, improve gas concentration lwevel in tower, then use oil-sealed rotary pump It vacuumizes to come out adsorbent carbon dioxide and is sent to intermediate gas tank.It is risen again by 4 pressures after vacuumizing Bed is inversely boosted to close to adsorptive pressure, adsorbent bed just initially enters next sorption cycle process.
This preparation system totally 9 first segment pressure-swing absorbers, the work step of 9 adsorption towers is just the same, only each Adsorption tower carries out different step, alternately.First segment pressure-variable adsorption uses 9-3-4V process, i.e. 9 pressure-swing absorbers, 3 towers It adsorbs simultaneously, presses for 4 times, vacuumizes regeneration process.The stripping gas vacuumized is intermediate gas, and intermediate gas enters intermediate gas tank Buffering enters second segment psa unit later；
3) first segment desorbs intermediate gas, after the second supercharger is pressurized to 0.17MPa or so, into the second air water Separator, after removing free water, into second segment pressure-swing absorber.Second segment uses 8-2-3V process, i.e. 8 pressure-variable adsorptions Tower, 2 towers adsorb simultaneously, press for 3 times, vacuumize regeneration process.
4) stripping gas vacuumized enters intermediate products gas tank, and carbon dioxide enters compressor, is pressurized to by 3 grades 3.0MPa (product gas), is purified subsequently into postorder purifying plant.
5) carbon dioxide for the purity about 95% come from compressor, is introduced into forecooler, enters back into purifying column, enter later Subcooler.Into forecooler carbon dioxide by with ice maker system come liquefied ammonia exchange heat and be condensed liquefaction, enter back into purification Tower carry out cryogenic rectification purification, final liquid carbon dioxide from purification tower bottom come out, by subcooler be cooled to -25 DEG C it is laggard Enter liquid CO2Storage tank.
6) from liquid CO2The liquid CO that storage tank comes2, into liquid CO2Force (forcing) pump carries out being pressurized to 3.0MPa, enters liquid afterwards Body CO2Gasifier, the CO after gasification2Gas enters 650m3, the gas spherical tank of 3.0MPa.

Claims (1)

1. a kind of preparation system for extracting carbon dioxide using steel-making lime kiln exhaust gas characterized by comprising concentration unit, Purifying plant and storage device, the CO of concentration unit2The CO of outlet conduit and purifying plant2Inlet pipeline connection, purifying plant CO2The CO of outlet conduit and storage device2Inlet pipeline connection；
The concentration unit include: gaseous effluent, the first supercharger, the first moisture trap, first segment pressure-swing absorber, Intermediate gas tank, the second supercharger, the second moisture trap, second segment pressure-swing absorber, intermediate products gas tank, compressor and machinery Vacuum pump；The import of exhaust piping and gaseous effluent from limekiln connects, the outlet of gaseous effluent and the first pressurization The import of machine connects, and the outlet of the first supercharger is connect with the import of the first moisture trap, the outlet of the first moisture trap It is connect with the import/export of first segment pressure-swing absorber, the import of the import/export of first segment pressure-swing absorber and intermediate gas tank connects Connect, the outlet of intermediate gas tank connect with the import of the second supercharger, the outlet of the second supercharger and the second moisture trap into Mouth connection, the outlet of the second moisture trap are connect with the import of second segment pressure-swing absorber, and second segment pressure-swing absorber goes out Mouth is connect with the import of intermediate products gas tank, and the outlet of intermediate products gas tank and the import of compressor connect；Oil-sealed rotary pump point It is not connect with the import/export of the import/export of first segment pressure-swing absorber and second segment pressure-swing absorber；
The purifying plant includes: forecooler, purifying column, subcooler and ice maker；The CO of compressor in concentration unit2Out Mouthful connect with the import of forecooler, the outlet of forecooler and the import connection of purifying column, the outlet of purifying column and subcooler into Mouth connection；Ice maker is connect with forecooler and subcooler respectively；
The storage device includes: liquid CO2Storage tank, liquid CO2Force (forcing) pump, liquid CO2Gasifier and gas CO2Spherical tank；Come The CO of subcooler from purifying plant2Outlet and liquid CO2The import of storage tank connects, liquid CO2The outlet of storage tank and liquid CO2 The import of force (forcing) pump connects, liquid CO2The outlet of force (forcing) pump and liquid CO2The import of gasifier connects, liquid CO2Gasifier Outlet and liquid CO2The import of gasifier connects, liquid CO2The outlet of gasifier and gas CO2The import of spherical tank connects.
CN201820435186.7U 2018-03-28 2018-03-28 The preparation system of carbon dioxide is extracted using steel-making lime kiln exhaust gas Active CN208302474U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113772673A (en) * 2021-09-08 2021-12-10 成都益志科技有限责任公司 Process system and method for recovering and purifying carbon dioxide from lime kiln tail gas
CN116440688A (en) * 2023-06-05 2023-07-18 精河县晶羿矿业有限公司 Carbon dioxide recovery process system of Mailz lime kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113772673A (en) * 2021-09-08 2021-12-10 成都益志科技有限责任公司 Process system and method for recovering and purifying carbon dioxide from lime kiln tail gas
CN116440688A (en) * 2023-06-05 2023-07-18 精河县晶羿矿业有限公司 Carbon dioxide recovery process system of Mailz lime kiln

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