CN107130079B - It is a kind of to prepare CO using coal gas of converter2And the method and system of cycle injection - Google Patents

It is a kind of to prepare CO using coal gas of converter2And the method and system of cycle injection Download PDF

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Publication number
CN107130079B
CN107130079B CN201710399741.5A CN201710399741A CN107130079B CN 107130079 B CN107130079 B CN 107130079B CN 201710399741 A CN201710399741 A CN 201710399741A CN 107130079 B CN107130079 B CN 107130079B
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China
Prior art keywords
converter
gas
purity
coal gas
combustion
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CN201710399741.5A
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Chinese (zh)
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CN107130079A (en
Inventor
朱荣
胡绍岩
董凯
魏光升
王云
武文合
吴学涛
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北京科技大学
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Priority to CN201710399741.5A priority Critical patent/CN107130079B/en
Publication of CN107130079A publication Critical patent/CN107130079A/en
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Publication of CN107130079B publication Critical patent/CN107130079B/en

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/38Removal of waste gases or dust
    • C21C5/40Offtakes or separating apparatus for converter waste gases or dust
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14Methods for preparing oxides or hydroxides in general
    • C01B13/16Purification
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/10Reduction of greenhouse gas [GHG] emissions
    • Y02P10/122Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The present invention is a kind of to prepare CO using coal gas of converter2And the method and system of cycle injection, belong to coal gas of converter recycling and CO2Purify the technical field prepared.Low N2The coal gas of converter of content and with O2、CO2Oxidant as main component burns in closed burner, and calory burning is utilized through heat-exchanger rig, and combustion product gases obtain being rich in CO after purified treatment2Pure flue gas, be rich in CO2Pure flue gas can be not only used for purifying and preparing high-purity CO2, also can be used as low-purity CO2It directly uses, low-purity CO2And high-purity CO2It is recycled for converter injection, converter sealing and prepares the oxidant needed for gas-fired.It is an advantage of the invention that low N can be obtained2The coal gas of converter of content recycles the flue gas that coal gas of converter burning generates, reduces the generation and discharge of nitrogen oxides, obtain to high-efficiency and low-cost low-purity CO2With prepare high-purity CO2

Description

It is a kind of to prepare CO using coal gas of converter2And the method and system of cycle injection
Technical field
The invention belongs to coal gas of converter recycling and CO2Purify prepare technical field, be related to it is a kind of utilize converter Coal gas prepares CO2And the method and system of cycle injection.
Background technology
In convertor steelmaking process, the carbon in molten iron and oxygen vigorous reaction generate a large amount of CO and a small amount of CO2, become The main component of coal gas of converter.In order to enhance stirring intensity of molten pool, accelerate metallurgical reaction speed, the usual bottom blowing N of converter2With Ar gas Body, the N being blown into2Enter coal gas of converter with the Ar gas overwhelming majority;During converter dust-removing exhausting, large quantity of air is by converter mouth It sucks, a large amount of N in air2It will be directed into coal gas of converter;To reduce air sucking, gas leak, converter mouth, oxygen are prevented The positions such as rifle hole generally use is blown N2Hermetic seal, sealing effect is general, while N in coal gas of converter2Gas increases;Therefore, common to turn Producer gas ingredient is generally CO, CO2With 10% ~ 40% N2Deng.
Due to high proportion N2Presence so that the calorific value of coal gas of converter is not high, and conventional burning temperatures are not high, and it is wide to limit it General application.Even if coal gas of converter uses purity oxygen burning process, although flame temperature can be improved to a certain extent, because of coal gas In itself contain a large amount of N2, nitrogen oxides will certainly be caused largely to generate.And nitrogen oxides has become the master of haze generation at present Want one of inducement, domestic limiting emission.
Converter current coal gas is mainly used for steel rolling heating, ladle baking, combustion power generation etc., and coal gas of converter burning generates a large amount of CO2, do not utilize direct emission, be the important source of steel gas greenhouse gas emission, but CO in coal gas of converter combustion tail gas2 Concentration is typically only 20% ~ 40%, separates and recovers CO2Difficult point is larger, and cost is excessively high.
The conventional pure O of top and bottom combined blown converter generally use top blast2With bottom blowing N2The smelting mode of/Ar, the technique easily cause molten bath It heats up too fast, is unfavorable for initial smelting period temperature control dephosphorization, the areas the Huo Dian temperature that top blast oxygen jet generates is high, leads to flue dust yield Greatly, and bottom blowing nitrogen to easily lead to nitrogen content of molten steel exceeded.Numerous studies show CO2In top and bottom combined blown converter steelmaking technique There is huge application value, using O2-CO2Mixed injection process for making helps to reduce flue dust yield, and enhancing molten bath is stirred It mixes, improves dephosphorization effect, reduce nitrogen content of molten steel.But there is no CO for most enterprises2Air source can not use O2-CO2Mixing It is blown process for making.
Currently, CO2Recycling and the main thought prepared be select the tail gas of limekiln or steam power plant as unstripped gas, but CO in the tail gas of limekiln or steam power plant2Content is generally only 20 ~ 35%, CO2Content is relatively low, and impurity component is more, leads Cause CO2Separation, purification and manufacturing cost be significantly increased.
Invention content
The purpose of the present invention is to provide for a kind of utilization coal gas of converter preparation CO2And the method and system of cycle injection, with Overcome the problems, such as of the existing technology.
The present invention is achieved by the following technical solutions:It is a kind of to prepare CO using coal gas of converter2And the side of cycle injection Method, this method utilize low N2The coal gas of converter of content and with O2、CO2Oxidant as main component fires in coal gas burner It burns, calory burning is utilized through heat-exchanger rig, and combustion product gases obtain being rich in CO after purified treatment2Pure flue gas, institute It states and is rich in CO2Pure flue gas be defined as low-purity CO2, a part described in low-purity CO2It is used to purify and prepare high-purity Spend CO2;The low-purity CO2And high-purity CO2It is circulated to converter air supply system, for converter top-blow, bottom-blowing of converter and is turned Stove seal protection obtains the low N2The coal gas of converter of content;The low-purity CO2And high-purity CO2It is circulated to oxidation Agent distributing cabinet, with technical pure O2Be mixed with coal gas of converter burning needed for O2、CO2Oxidant as main component;Described High-purity CO2It is used as other purposes as product.
Further, this method specifically includes following step:
Step 1:The low N that pneumatic steelmaking is generated2The coal gas of converter of content is stored in gas chamber;
Step 2:Coal gas of converter in the gas chamber is imported into coal with the oxidant in oxidant distributing cabinet according to proportioning It is mixed and burned in gas burner;
Step 3:Burn in the coal gas burner generation high-temperature flue gas after heat-exchanger rig enter combustion product gases In purification and storage system, constituent analysis is carried out in the combustion product gases purification and storage system, the flue gas of ingredient qualification is in burning cigarette It is purified and is stored in gas purification and storage system, obtain being rich in CO2Pure flue gas, it is described be rich in CO2Pure flue gas determined Justice is low-purity CO2, the flue gas of off analysis arranges after being purified in combustion product gases purification and storage system through combustion product gases It is emptied in empty chimney;
Step 4:The low-purity CO obtained described in a part handled by step 32Import CO2Purification prepares stocking system, Obtain high-purity CO2
Step 5:Step 3 is obtained to the low-purity CO described in a part2A part of high-purity CO is obtained with step 42It imports and turns Stove air supply system mixes with other media and is used as converter top-blow gas, bottom blown gas and seal protection gas;
Step 6:Step 3 obtains the low-purity CO described in a part2A part of high-purity CO is obtained with step 42Import oxidation In agent distributing cabinet with technical pure O2It is mixed with the oxidant needed for coal gas of converter burning.
Step 7:The high-purity CO that step 4 is obtained2In a part be used as product by the collection of product air pipe and be used as Other purposes.
Further, the low N2The coal gas of converter of content is to utilize the low-purity CO2And high-purity CO2To converter into What row seal protection obtained, with CO2Instead of N2Bottom-blowing of converter is carried out, with CO2Instead of N2As converter oxygen gun hole sealing gas, to CO is blown around converter mouth2To inhibit N in air2Be mixed into.
Further, the low N2N in the coal gas of converter of content2Content is that 0 ~ 20%, CO contents are 50% ~ 90%, CO2Content is 10%~50%。
Further, described with O2、CO2Oxidant as main component is by the low-purity CO2, high-purity CO2And industry Pure O2It is mixed with, wherein O2Content is 5% ~ 100%, CO2Content is 0 ~ 95%, N2Content is 0 ~ 20%.
Further, the low-purity CO2In CO2Content is 75% ~ 95%, N2Content is 0 ~ 20%, O2Content is 0 ~ 5%, CO Content is 0 ~ 1%;The high-purity CO2In CO2Content is 98% ~ 100%.
Further, gas analysis Rule of judgment is in the step 3:If CO in flue gas2Content is 75% ~ 95%, N2Content For 0 ~ 20%, O2Content is that 0 ~ 5%, CO contents are 0 ~ 1%, then is the flue gas of ingredient qualification, is otherwise the flue gas of off analysis.
It is a further object of the present invention to provide the realization above method CO is prepared using coal gas of converter2And cycle injection be System, the system include converter air supply system, converter, gas chamber, oxidant distributing cabinet, the gas-fired dress for gas-fired It sets, heat-exchanger rig, for smoke components and the flue gas of ingredient qualification being purified and being stored after analyzing burning, ingredient is not conformed to The combustion product gases purification and storage system that the flue gas of lattice is purified and emptied, for according to combustion product gases composition adjustment coal gas of converter With oxidizer flow rate so that the combustion control system of combustion product gases ingredient qualification, CO2Purification prepares stocking system, converter top-blow dress It sets, oxygen rifle hole sealing device, fire door atmosphere protection device, converter bottom-blowing device, oxygen channel and combustion product gases empty chimney, institute Converter to be stated to connect with the gas chamber, the gas chamber and the oxidant distributing cabinet are connect with the coal gas burner, The heat-exchanger rig is connect with the coal gas burner, and one end and the coal gas of the combustion product gases purification and storage system fire Burn device connection, the other end respectively with the converter air supply system, CO2Purification prepares the air inlet of stocking system, oxidant is matched Gas holder is connected with combustion product gases emptying chimney, and one end of the combustion control system connects with the combustion product gases purification and storage system It connects, the other end is connect with the coal gas burner, the CO2Purification prepare the gas outlet of stocking system by pipeline respectively with The converter air supply system, oxidant distributing cabinet and product gas piping connection;The converter air supply system respectively with the converter Top blast device, oxygen rifle hole sealing device, fire door atmosphere protection device are connected with converter bottom-blowing device.
Further, which includes fire door atmosphere protection device, by pressing down to injection protective gas around converter mouth Air processed is mixed into, and the fire door atmosphere protection device is arranged in the fire door position of the converter, the fire door atmosphere protection dress It sets and is connect with the converter air supply system by pipeline.
Further, the combustion control system acquires the smoke components that the combustion product gases purification and storage system is analyzed Information, the coal gas of converter flow and oxidizer flow rate of coal gas burner entrance described in feedback regulation.
Further, the combustion product gases purification and storage system includes main body, and the smoke components in body interior are arranged Analytical equipment, smoke eliminator, qualified flue gas storage tank and unqualified flue gas emptying pipeline, the fume component analysis device, Smoke eliminator and qualified flue gas storage tank are sequentially connected, the unqualified flue gas emptying pipeline setting in smoke eliminator and Between qualified flue gas storage tank, and the unqualified flue gas emptying pipeline is connect with combustion product gases emptying chimney, the flue gas Composition analysis device is connect with the combustion control system.
Described method and system is suitable for 30 ~ 350 tons of steelmaking converter.
The carrying out practically process of described method and system is:
Under original state, a small amount of high-purity CO is obtained from outside2Gas is stored in CO2Purification prepares the storage tank of stocking system In, and import converter air supply system and oxidant distributing cabinet;In converter steelmaking process, high-purity CO is utilized2With technical pure O2Mixing As converter top-blow gas, high-purity CO is utilized2As bottom-blowing of converter gas, high-purity CO is utilized2As oxygen rifle hole sealing gas N in the coal gas generated with fire door atmosphere protection gas, at this time pneumatic steelmaking2Content is less than 10%;Coal gas of converter is stored in gas chamber In;Oxidant distributing cabinet utilizes technical pure O2And high-purity CO2It is mixed with oxidant;Coal gas of converter and oxidant are fired in coal gas It burns to burn in device and generates high-temperature flue gas, CO in combustion product gases2Content is 80% ~ 98%, N2Content is 0 ~ 10%, O2Content be 0 ~ 5%, CO content are 0 ~ 1%, and the heat for generation of burning is utilized by heat-exchanger rig;Then, combustion product gases enter combustion product gases Purification and storage system obtains being rich in CO after the purified treatments such as dedusting, de-oiling, dehydration2Pure flue gas, a part be rich in CO2 Pure flue gas as low-purity CO2Directly use;A part is rich in CO2Pure flue gas import CO2Purification prepares storage system System, high efficiency prepare high-purity CO at low cost2, and it is stored in CO2Purification is prepared in the storage tank of stocking system, is hereafter no longer needed High-purity CO is obtained from outside2;The low-purity CO of combustion product gases purification and storage system production2And CO2Purification prepares stocking system The high-purity CO of production2Converter air supply system is imported, the top-blown gas as converter, bottom blown gas and close are mixed with other media Seal protective gas;Meanwhile low-purity CO2And high-purity CO2Oxidant distributing cabinet is imported, with technical pure O2It is mixed with converter coal Oxidant needed for gas burning;Since then, system of the present invention realizes circular flow pattern, it is no longer necessary to obtain height from outside Purity CO2
Beneficial effects of the present invention include:
(1)CO is provided for pneumatic steelmaking2Air source, converter are blown CO2, melting bath stirring can be enhanced, flue dust is reduced and generate Amount improves dephosphorization rate;
(2)Using CO2After bottom-blowing of converter and seal protection gas, N in coal gas of converter can be greatly reduced2Content improves Calorific value of gas reduces coal gas diffusion, increases the coal-gas recovering amount of pneumatic steelmaking;
(3)Using O2-CO2It is excessively high can both to solve flame temperature caused by pure oxygen burning as oxidant for mixed gas The generation of nitrogen oxides in combustion process can also be greatly reduced in problem;
(4)The flue gas that gas-fired generates is able to recycle and recycle, and reduces CO2The discharge of isothermal chamber gas;
(5)For CO2Purification preparation provide and a kind of being rich in CO2Unstripped gas, significantly reduce CO2Purification be prepared into This.
Description of the drawings
Fig. 1 is that the present invention is a kind of preparing CO using coal gas of converter2And the system schematic of cycle injection.
Fig. 2 is the structural schematic diagram of the combustion product gases purification and storage system in the present invention.
In figure:1- converter air supply systems, 2- converters, 3- gas chambers, 4- oxidant distributing cabinets, 5- coal gas burners, 6- Heat-exchanger rig, 7- combustion product gases purification and storage systems, 7-1- main bodys, 7-2- fume component analysis device, 7-3- gas cleanings dress It sets, 7-4- qualification flue gas storage tanks, the unqualified flue gases of 7-5 empty pipeline, 8- combustion control systems, 9-CO2Purification prepares storage system System, 10- converter top-blow devices, 11- oxygen rifles hole sealing device, 12- fire door atmosphere protection devices, 13- converter bottom-blowing devices, 14- Oxygen channel, 15- combustion product gases empty chimney, 16-CO2Product gas pipeline, 17- coal gas of converter flowmeters, 18.- oxidants Flowmeter.
Specific implementation mode
The specific implementation mode of the present invention will in conjunction with the embodiments and attached drawing illustrates.
As Figure 1-Figure 2, the present invention is a kind of preparing CO using coal gas of converter2And cycle injection system, the system include Converter air supply system 1, converter 2, gas chamber 3, oxidant distributing cabinet 4 are used for the coal gas burner 5 of gas-fired, heat exchange dress 6 are set, for smoke components and the flue gas of ingredient qualification being purified and being stored after analyzing burning, to the flue gas of off analysis The combustion product gases purification and storage system 7 for being purified and being emptied, for according to combustion product gases composition adjustment coal gas of converter and oxidation Agent flux makes the combustion control system 8, CO of combustion product gases ingredient qualification2Purification prepares stocking system 9, converter top-blow device 10, oxygen rifle hole sealing device 11, fire door atmosphere protection device 12, converter bottom-blowing device 13, oxygen channel 14 and combustion product gases row Empty chimney 15;
Wherein, the combustion product gases purification and storage system 7 includes main body, and the flue gas that is arranged inside main body 7-1 at Point analytical equipment 7-2, smoke eliminator 7-3, qualification flue gas storage tank 7-4 and unqualified flue gas empty pipeline 7-5, described not conform to Lattice flue gas empties pipeline 7-5 settings between smoke eliminator 7-3 and qualified flue gas storage tank 7-4;
The converter 2 is connect with the gas chamber 3, and the gas chamber 3 is connected by pipeline and the coal gas burner 5 It connects, and the pipeline is equipped with coal gas of converter flowmeter 17, the oxidant distributing cabinet 4 is filled by pipeline and the closed burning 5 connections, and the pipeline is equipped with oxidant stream gauge 18, the heat-exchanger rig 6 is connect with the coal gas burner 5, institute The one end for stating combustion product gases purification and storage system 7 is connect with the coal gas burner 5, and the other end is supplied with the converter respectively System 1, CO2Purification prepares the air inlet of stocking system 9, oxidant distributing cabinet 4 and combustion product gases emptying chimney 15 and connects, described One end of combustion control system 8 is connect with the fume component analysis device 7-2, the other end respectively with the coal gas of converter flow Meter 17 is connected with oxidant stream gauge eighteen data, the CO2Purification prepare the gas outlet of stocking system 9 by pipeline respectively with institute Converter air supply system 1, oxidant distributing cabinet 4 and product air pipe 16 is stated to connect;The converter air supply system 1 respectively with described turn Furnace roof blowing apparatus 10, oxygen rifle hole sealing device 11, fire door atmosphere protection device 12 and converter bottom-blowing device 13 connect, described not conform to Lattice flue gas empties pipeline 7-5 and is connect with combustion product gases emptying chimney 15.
The combustion product gases purification and storage system 7 includes main body 7-1, and the fume component analysis in body interior is arranged Device 7-2, smoke eliminator 7-3, qualification flue gas storage tank 7-4 and unqualified flue gas empty pipeline 7-5, the unqualified flue gas Emptying pipeline is connect with combustion product gases emptying chimney, and the fume component analysis device connects with the combustion control system It connects, the combustion control system is connected with coal gas of converter flow 17 and the control of oxidizer flow rate 18 respectively.
The oxidant distributing cabinet 4 using from oxygen channel 9 oxygen and from combustion product gases purification and storage system 7 Low-purity CO2, come from CO2Purification prepares the high-purity CO of stocking system 82The oxidant needed for coal gas of converter burning is prepared, mainly Ingredient is O2And CO2, the proportioning of oxidant is depending on equipment situation and process requirements;
The coal gas burner 5 is used for the burning of pneumatic steelmaking coal gas and oxidant, and net according to the combustion product gases Change stocking system 7 and analyzes the proportioning that obtained smoke components come feedback regulation coal gas of converter and oxidant;In order to avoid air is mixed Enter it is excessive with combustion product gases, the coal gas burner 5 be coal gas burner;
The heat-exchanger rig 6 is for recycling heat caused by coal gas of converter burning;
The combustion product gases purification and storage system 7 carries out ingredient point to the combustion product gases that the coal gas burner 5 generates The combustion product gases of ingredient qualification are purified and are stored by analysis and purified treatment, obtain being rich in CO2Pure flue gas, the richness Containing CO2Pure flue gas can be used as low-purity CO2It directly uses, the combustion product gases of off analysis is purified and emptied;
The CO2Purification prepares stocking system 8 and is rich in CO with what the combustion product gases purification and storage system 7 obtained2It is pure Flue gas purifies as unstripped gas and prepares high-purity CO2, and CO can be adjusted according to product demand2Purification concentration.
The present invention is a kind of to prepare CO using coal gas of converter2And the method for cycle injection, specifically include following step:
Step 1:The low N that the steel-making of converter 2 is generated2The coal gas of converter of content is stored in gas chamber 3;
Step 2:Coal gas of converter in the gas chamber 3 is imported with the oxidant in oxidant distributing cabinet 4 according to proportioning It is mixed and burned in coal gas burner 5;
Step 3:Burn in the coal gas burner generation high-temperature flue gas after heat-exchanger rig 6 enter combustion product gases In purification and storage system 7, constituent analysis is carried out in the combustion product gases purification and storage system 7, data are sent to burning after analysis Control system 8, the combustion control system 8 control coal gas of converter flow 17 and oxidizer flow rate 18 by the data received, Enter gas ratio in coal gas burner 5 to adjust, the flue gas of ingredient qualification in combustion product gases purification and storage system into Row purification and storage obtain being rich in CO2Pure flue gas, it is described be rich in CO2Pure flue gas be defined as low-purity CO2, ingredient Underproof flue gas is emptied after being purified in combustion product gases purification and storage system 7 through combustion product gases emptying chimney 15;
Step 4:The low-purity CO obtained described in a part handled by step 32Import CO2Purification prepares stocking system 8, obtain high-purity CO2
Step 5:Low-purity CO described in the part that step 3 is obtained2A part of high-purity CO is obtained with step 42It imports Converter air supply system 1 mixes with other media and is used as converter top-blow gas, bottom blown gas and seal protection gas;
Step 6:Low-purity CO described in the part that step 3 obtains2A part of high-purity CO obtained with step 42It imports In oxidant distributing cabinet 4 with technical pure O2It is mixed with the oxidant needed for coal gas of converter burning.
Step 7:The high-purity CO that step 4 is obtained2In a part by product air pipe 16 collection be used as product use Make other purposes.
Embodiment:
It is a kind of to prepare CO using coal gas of converter2And the method for cycle injection, utilize low N2The coal gas of converter of content and with O2、 CO2Oxidant as main component burns in coal gas burner, and calory burning is utilized through heat-exchanger rig, combustion product gases It obtains being rich in CO after purified treatment2Pure flue gas, it is described be rich in CO2Pure flue gas be defined as low-purity CO2, one Low-purity CO described in part2It is used to purify and prepare high-purity CO2;The low-purity CO2And high-purity CO2It is recycled To converter air supply system, it is used for converter top-blow, bottom-blowing of converter and converter seal protection, the low N can be obtained2Content turns Producer gas;The low-purity CO2And high-purity CO2It is circulated to oxidant distributing cabinet, with technical pure O2It is mixed with converter coal Gas burning needed for O2、CO2Oxidant as main component;The low-purity CO2And high-purity CO2It can be used as product use Make other purposes.
In the present embodiment, the method is applied to 100 tons of steelmaking converters, the low-purity CO that the present invention is produced2And height Purity CO2It is connect with converter air supply system, in smelting process, utilizes low-purity CO2, high-purity CO2With technical pure O2Mixing is made For converter top-blow gas, low-purity CO is utilized2And high-purity CO2Mixing is used as bottom-blowing of converter gas, utilizes low-purity CO2As Oxygen rifle hole sealing gas and fire door atmosphere protection gas, N in the coal gas that the converter smelting generates2Content is that 10%, CO contents are 75%, CO2Content is 15%;Oxidant needed for coal gas of converter burning is by low-purity CO2, high-purity CO2With technical pure O2Mixing system It is standby, wherein O2Content is 40%, CO2Content is 50%, N2Content is 10%;Coal gas of converter and oxidant mix in coal gas burner CO in the flue gas generated after combination burning2Content is 85%, O2Content is 3%, N2Content is that 12%, CO contents are micro, be can not only be used for Low-purity CO2It directly uses, it can also be used to purifying and preparing high-purity CO2
The method specifically includes following step:
The coal gas of converter that pneumatic steelmaking generates is stored in gas chamber;Coal gas of converter in gas chamber is matched with oxidant Oxidant in gas holder imports coal gas burner according to proportioning;Burn in coal gas burner generation high-temperature flue gas by changing Enter combustion product gases purification and storage system after thermal, the flue gas of ingredient qualification carries out only in combustion product gases purification and storage system Change and store, obtains being rich in CO2Pure flue gas, the flue gas of off analysis carries out only in combustion product gases purification and storage system Change and empties;Rich in CO2Pure flue gas be defined as low-purity CO2, a part described in low-purity CO2It is imported into CO2Purification Stocking system is prepared, high-purity CO is obtained2;By a part of low-purity CO2And high-purity CO2Converter air supply system is imported, and it is other Medium mixing is used as converter top-blow gas, bottom blown gas and seal protection gas;By the low-purity CO described in a part2With it is high-purity Spend CO2Import oxidant distributing cabinet and technical pure O2It is mixed with the oxidant needed for coal gas of converter burning;The low-purity CO2And high-purity CO2It can be used as product and be used as other purposes.
The specific circular flow process of the method is:
Under original state, a small amount of high-purity CO is obtained from outside2Gas is stored in CO2Purification prepares the storage tank of stocking system In, and import converter air supply system and oxidant distributing cabinet;In converter steelmaking process, high-purity CO is utilized2With technical pure O2Mixing As converter top-blow gas, high-purity CO is utilized2As bottom-blowing of converter gas, high-purity CO is utilized2As oxygen rifle hole sealing gas N in the coal gas generated with fire door atmosphere protection gas, at this time pneumatic steelmaking2Content is 6%;Coal gas of converter is stored in gas chamber; Oxidant distributing cabinet utilizes technical pure O2And high-purity CO2It is mixed with oxidant;Coal gas of converter and oxidant are filled in gas-fired It sets middle burning and generates high-temperature flue gas, CO in combustion product gases2Content is 93%, O2Content is 3%, N2Content is micro- less than 4%, CO contents Amount, the heat for generation of burning are utilized by heat-exchanger rig;Then, combustion product gases enter combustion product gases purification and storage system, It obtains being rich in CO after the purified treatments such as dedusting, de-oiling, dehydration2Pure flue gas, be rich in CO2Pure flue gas can be used as it is low Purity CO2Directly use;A part is rich in CO2Pure flue gas import CO2Purification prepares stocking system, high efficiency, at low cost Prepare high-purity CO2, and it is stored in CO2Purification is prepared in the storage tank of stocking system, hereafter no longer needs to obtain CO from outside2Production Product gas;The low-purity CO of combustion product gases purification and storage system production2And CO2Purification prepares the high-purity CO of stocking system production2 Converter air supply system is imported, the top-blown gas as converter, bottom blown gas and seal protection gas are mixed with other media;Together When, low-purity CO2And high-purity CO2Oxidant distributing cabinet is imported, with technical pure O2It is mixed with the oxygen needed for coal gas of converter burning Agent;Since then, system of the present invention realizes circular flow pattern, it is no longer necessary to obtain high-purity CO from outside2
The specific circular flow process of the method for the invention and system is:
Under original state, a small amount of high-purity CO is obtained from outside2Gas is stored in CO2Purification prepares the storage tank of stocking system In, and import converter air supply system and oxidant distributing cabinet;In converter steelmaking process, high-purity CO is utilized2With technical pure O2Mixing As converter top-blow gas, high-purity CO is utilized2As bottom-blowing of converter gas, high-purity CO is utilized2As oxygen rifle hole sealing gas N in the coal gas generated with fire door atmosphere protection gas, at this time pneumatic steelmaking2Content is 6%;Coal gas of converter is stored in gas chamber; Oxidant distributing cabinet utilizes technical pure O2And high-purity CO2It is mixed with oxidant;Coal gas of converter and oxidant are filled in gas-fired It sets middle burning and generates high-temperature flue gas, CO in combustion product gases2Content is 93%, O2Content is 3%, N2Content is micro- less than 4%, CO contents Amount, the heat for generation of burning are utilized by heat-exchanger rig;Then, combustion product gases enter combustion product gases purification and storage system, It obtains being rich in CO after the purified treatments such as dedusting, de-oiling, dehydration2Pure flue gas, be rich in CO2Pure flue gas can be used as it is low Purity CO2Directly use;A part is rich in CO2Pure flue gas import CO2Purification prepares stocking system, high efficiency, at low cost Prepare high-purity CO2, and it is stored in CO2Purification is prepared in the storage tank of stocking system, hereafter no longer needs to obtain CO from outside2Production Product gas;The low-purity CO of combustion product gases purification and storage system production2And CO2Purification prepares the high-purity CO of stocking system production2 Converter air supply system is imported, the top-blown gas as converter, bottom blown gas and seal protection gas are mixed with other media;Together When, low-purity CO2And high-purity CO2Oxidant distributing cabinet is imported, with technical pure O2It is mixed with the oxygen needed for coal gas of converter burning Agent;Since then, system of the present invention realizes circular flow pattern, it is no longer necessary to obtain high-purity CO from outside2
Particular embodiments described above elaborates the purpose of the present invention, technical solution and advantageous effect, institute It should be understood that the above is only a specific embodiment of the present invention, it is not intended to restrict the invention, it is all the present invention's Within spirit and principle, any modification, equivalent substitution, improvement and etc. done should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of preparing CO using coal gas of converter2And the method for cycle injection, which is characterized in that this method is by low-purity CO2And height Purity CO2It is recycled to converter air supply system, is used for converter top-blow and bottom-blowing of converter, and with CO2Instead of N2It is close as converter oxygen gun hole Seal gas, to converter mouth around be blown CO2To inhibit N in air2Be mixed into, obtain low N2The coal gas of converter of content;Low N2Contain The coal gas of converter of amount and with O2、CO2Oxidant as main component burns in coal gas burner, and calory burning is filled through heat exchange It sets and is utilized, combustion product gases obtain the low-purity CO after purified treatment2, a part described in low-purity CO2By with In purification and prepare the high-purity CO2;The low-purity CO2And high-purity CO2It is circulated to oxidant distributing cabinet, with Technical pure O2Be mixed with coal gas of converter burning needed for O2、CO2Oxidant as main component;The low-purity CO2With High-purity CO2It is circulated to converter air supply system, the method realizes circular flow pattern.
2. a kind of utilization coal gas of converter according to claim 1 prepares CO2And the method for cycle injection, which is characterized in that just Under beginning state, a small amount of high-purity CO is obtained from outside2Gas is stored in CO2Purification is prepared in the storage tank of stocking system, and is imported and turned Stove air supply system and oxidant distributing cabinet;In converter steelmaking process, high-purity CO is utilized2With technical pure O2Mixing is used as converter top Blowing utilizes high-purity CO2As bottom-blowing of converter gas, high-purity CO is utilized2As oxygen rifle hole sealing gas and fire door atmosphere Protective gas, pneumatic steelmaking at this time generate coal gas in N2Content is less than 10%;Coal gas of converter is stored in gas chamber;Oxidant Distributing cabinet utilizes technical pure O2And high-purity CO2It is mixed with oxidant;Coal gas of converter and oxidant fire in coal gas burner It burns and generates high-temperature flue gas, CO in combustion product gases2Content is 80% ~ 98%, N2Content is 0 ~ 10%, O2Content is that 0 ~ 5%, CO contents are 0 ~ 1%, the heat for generation of burning is utilized by heat-exchanger rig;Then, combustion product gases enter combustion product gases purification and storage system, It obtains being rich in CO after dedusting, de-oiling, dewatered clean processing2Pure flue gas, a part be rich in CO2Pure flue gas conduct Low-purity CO2Directly use;A part is rich in CO2Pure flue gas import CO2Purification prepares stocking system, high efficiency, low cost Ground prepares high-purity CO2, and it is stored in CO2Purification is prepared in the storage tank of stocking system, hereafter no longer needs to obtain from outside high-purity Spend CO2, the startup of circular flow pattern.
3. a kind of utilization coal gas of converter according to claim 1 prepares CO2And the method for cycle injection, which is characterized in that tool Body includes the following steps:
Step 1:By converter(2)Make steel the low N generated2The coal gas of converter of content is stored in gas chamber(3)In;
Step 2:By the gas chamber(3)In coal gas of converter and oxidant distributing cabinet(4)In oxidant according to proportioning import Coal gas burner(5)In be mixed and burned;
Step 3:Burn in the coal gas burner generation high-temperature flue gas pass through heat-exchanger rig(6)It is net to enter combustion product gases afterwards Change stocking system(7)In, in the combustion product gases purification and storage system(7)Constituent analysis is carried out, the flue gas of ingredient qualification is firing It burns in gas cleaning stocking system and is purified and stored, obtain being rich in CO2Pure flue gas, it is described be rich in CO2Pure flue gas It is defined as low-purity CO2, the flue gas of off analysis is in combustion product gases purification and storage system(7)In purified after through burning Flue gas empties chimney(15)It is emptied;
Step 4:The low-purity CO described in an obtained part is handled by step 32Import CO2Purification prepares stocking system(9), Obtain high-purity CO2
Step 5:Step 3 is obtained to the low-purity CO described in a part2A part of high-purity CO is obtained with step 42Converter is imported to supply Gas system(1), mixed with other media and be used as converter top-blow gas, bottom blown gas and seal protection gas;
Step 6:Step 3 obtains the low-purity CO described in a part2A part of high-purity CO is obtained with step 42Oxidant is imported to match Gas holder(4)In with technical pure O2It is mixed with the oxidant needed for coal gas of converter burning;
Step 7:The high-purity CO that step 4 is obtained2In a part pass through product air pipe(16)It collects and is used as it as product Its purposes.
4. a kind of utilization coal gas of converter according to claim 3 prepares CO2And the method for cycle injection, which is characterized in that institute State low N2N in the coal gas of converter of content2Content is that 0 ~ 20%, CO contents are 50% ~ 90%, CO2Content is 10% ~ 50%.
5. a kind of utilization coal gas of converter according to claim 3 prepares CO2And the method for cycle injection, which is characterized in that institute It states with O2、CO2Oxidant as main component is by the low-purity CO2, high-purity CO2With technical pure O2It is mixed with, wherein O2Content is 5% ~ 100%, CO2Content is 0 ~ 95%, N2Content is 0 ~ 20%.
6. a kind of utilization coal gas of converter according to claim 3 prepares CO2And the method for cycle injection, which is characterized in that institute State low-purity CO2In CO2Content is 75% ~ 95%, N2Content is 0 ~ 20%, O2Content is that 0 ~ 5%, CO contents are 0 ~ 1%;The height Purity CO2In CO2Content is 98% ~ 100%.
7. a kind of utilization coal gas of converter according to claim 3 prepares CO2And the method for cycle injection, which is characterized in that institute Stating gas analysis Rule of judgment in step 3 is:If CO in flue gas2Content is 75% ~ 95%, N2Content is 0 ~ 20%, O2Content is 0 ~ 5%, CO content are 0 ~ 1%, then are the flue gas of ingredient qualification, are otherwise the flue gas of off analysis.
8. a kind of preparing CO using coal gas of converter2And the system of cycle injection, which includes converter air supply system(1), converter (2), gas chamber(3), oxidant distributing cabinet(4), it is used for the coal gas burner of gas-fired(5), heat-exchanger rig(6), it is used for It analyzes smoke components after burning and the flue gas of ingredient qualification is purified and stored, the flue gas of off analysis is purified With the combustion product gases purification and storage system of emptying(7), for according to combustion product gases composition adjustment coal gas of converter and oxidizer flow rate So that the combustion control system of combustion product gases ingredient qualification(8), CO2Purification prepares stocking system(9), converter top-blow device (10), oxygen rifle hole sealing device(11), fire door atmosphere protection device(12), converter bottom-blowing device(13), oxygen channel(14)With Combustion product gases empty chimney(15), which is characterized in that the converter(2)With the gas chamber(3)Connection, the gas chamber(3) With the oxidant distributing cabinet(4)With the coal gas burner(5)Connection, the heat-exchanger rig(6)It is fired with the coal gas Burn device(5)Connection, the combustion product gases purification and storage system(7)One end and the coal gas burner(5)Connection, it is another End respectively with the converter air supply system(1)、CO2Purification prepares stocking system(9)Air inlet, oxidant distributing cabinet(4)With Combustion product gases empty chimney(15)Connection, the combustion control system(8)One end and the combustion product gases purification and storage system (7)Connection, the other end and the coal gas burner(5)Connection, the CO2Purification prepares stocking system(9)Gas outlet it is logical Cross pipeline respectively with the converter air supply system(1), oxidant distributing cabinet(4)With product air pipe(16)Connection;The converter Air supply system(1)Respectively with the converter top-blow device(10), oxygen rifle hole sealing device(11), fire door atmosphere protection device(12) And converter bottom-blowing device(13)Connection.
9. a kind of utilization coal gas of converter according to claim 8 prepares CO2And the system of cycle injection, which is characterized in that should System includes fire door atmosphere protection device, described by inhibiting being mixed into for air to injection protective gas around converter mouth Fire door atmosphere protection device is arranged in the converter(2)Fire door position, the fire door atmosphere protection device passes through pipeline and institute State converter air supply system(1)Connection.
10. a kind of utilization coal gas of converter according to claim 8 prepares CO2And the system of cycle injection, which is characterized in that The combustion control system(8)Acquire the combustion product gases purification and storage system(7)Analyze obtained smoke components information, feedback Adjust the coal gas burner(5)Pass through the coal gas of converter flow and oxidizer flow rate of entrance.
CN201710399741.5A 2017-05-31 2017-05-31 It is a kind of to prepare CO using coal gas of converter2And the method and system of cycle injection CN107130079B (en)

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CN107840337B (en) * 2017-11-08 2019-10-22 中冶西北工程技术有限公司 A kind of system and method preparing dry ice using blast furnace gas and liquid oxygen
CN109234490B (en) * 2018-11-07 2020-06-26 北京科技大学 High-efficiency long-life blowing method and system for vanadium extraction-decarburization duplex converter
CN109837358B (en) * 2019-03-26 2020-04-14 东北大学 Steelmaking flue gas self-circulation composite converting system and method
CN111748672A (en) * 2020-06-10 2020-10-09 北京科技大学 Short-process low-cost CO preparation method by converter gas2And high-value application system and process

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JPS5852414A (en) * 1981-09-24 1983-03-28 Kobe Steel Ltd Prodouction of co2 for bottom blowing of converter
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CN101818227A (en) * 2010-05-05 2010-09-01 北京科技大学 Method for recycling CO2 separated from converter steel-making gas for top blowing and bottom blowing
CN105779684A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Converter coal gas recycling system and recycling method thereof
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JPS55158211A (en) * 1979-05-24 1980-12-09 Sumitomo Metal Ind Ltd Refining device of steel having gas circulating system
JPS56127719A (en) * 1980-03-07 1981-10-06 Kawasaki Steel Corp Utilization of waste gas generated from ironworks protective gas of tuyere
JPS5852414A (en) * 1981-09-24 1983-03-28 Kobe Steel Ltd Prodouction of co2 for bottom blowing of converter
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CN101818227A (en) * 2010-05-05 2010-09-01 北京科技大学 Method for recycling CO2 separated from converter steel-making gas for top blowing and bottom blowing
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