CN115466987A - By using CO 2 System and method for preparing CO gas by carbon-free deoxidation - Google Patents

By using CO 2 System and method for preparing CO gas by carbon-free deoxidation Download PDF

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CN115466987A
CN115466987A CN202211046621.4A CN202211046621A CN115466987A CN 115466987 A CN115466987 A CN 115466987A CN 202211046621 A CN202211046621 A CN 202211046621A CN 115466987 A CN115466987 A CN 115466987A
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pipeline
purity
carbon
iron
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武文合
鲁雄刚
张玉文
祝凯
李光石
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University of Shanghai for Science and Technology
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    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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Abstract

The invention discloses a method for utilizing CO 2 A system and a method for preparing CO gas by carbon-free deoxidation transform a steel-making induction furnace into a closed gas making furnace, CO 2 Or containing a high concentration of CO 2 The industrial tail gas is used as raw material gas and is introduced into an oxygen saturated iron-based melt at 1600-1800 ℃ from a bottom blowing element to prepare high-concentration CO gas, CO 2 The deoxidized product FeO is transferred to the slag phase and realizes the oxygen removal and the reduction regeneration of iron by an external electric field modeCO with oxygen-saturated iron-based melt solute iron element as oxygen transfer medium 2 Method for preparing CO by carbon-free deoxidation and CO 2 The energy required by decomposition heat absorption and slag electrochemical reduction heat consumption can be generated by a photovoltaic, wind, hydraulic or nuclear power generation device, and CO is realized without additional carbon input by taking green electricity as an energy carrier 2 The carbon neutral cycle process coupled with the high-efficiency mass energy conversion of CO and the steel-chemical CO-production is opened, and the method has good application and development prospects.

Description

By using CO 2 System and method for preparing CO gas by carbon-free deoxidation
Technical Field
The invention relates to a ferrous metallurgy process CO 2 The field of gas resource utilization and CO gas efficient preparation production, in particular to a method for utilizing CO 2 A system and a method for preparing CO gas by carbon-free deoxidation.
Background
At present, the artificial photosynthesis is tried to produce hydrocarbon at home and abroad to reduce CO in the atmosphere 2 Concentration, i.e. CO conversion by green energy 2 Synthesis of hydrocarbons with water or hydrogen; but CO 2 High bond energy, direct adoption of CO 2 The yield of hydrogenation products is low, so the prior art route is firstly to mix CO 2 Removing an oxygen atom to generate more reactive CO, and combining the CO with water or hydrogen to convert into liquid hydrocarbon. At present, 1mol of CO is generated in the industrial catalytic process 2 Energy of at least 1.33eV is applied for converting the CO, an additional 1.5eV energy and a noble metal catalyst are simultaneously required, the energy required for synthesizing the hydrocarbon is far more than the energy stored in a chemical bond, a high-temperature and high-pressure environment is generally required for improving the conversion efficiency and the reaction rate of the CO, and at present, the CO 2 The conversion is usually between 40% and 60%. Whether CO can be introduced into the molten pool in the steel smelting process or not by utilizing the high-efficiency mass and heat transfer reaction environment 2 The carbon is converted into CO to be supplied to the chemical industry, so that the deep coupling of the tempering and CO-production of carbon reduction at the steel source and carbon fixation at the chemical tail end is realized, and the deep coupling is a key subject which is continuously concerned by steel metallurgy workers.
Chinese invention patent' a method for utilizing CO 2 System and method for producing CO gas (application No. 202111603595.6) based on CO 2 The high decomposition rate characteristic of gas reaction in oxygen-saturated iron-based melt, provides a method for preparing high-purity CO 2 The gas is introduced into a molten pool at the temperature ofIn the oxygen saturated Fe-O-C melt (CO) between 1600 ℃ and 1800 DEG C 2 +Fe→CO+FeO]The gas phase product is processed by a gas separation device to prepare high-purity CO gas, although the method can efficiently dissolve CO in a large scale 2 Gas, but its deoxygenated product FeO is regenerated by reduction of the carbonaceous material to metallic iron [ FeO + C → Fe + CO ]]Further realizes the recycling of the iron element, and the process is still the nature that an external carbon source passes through CO in a carbon reduction way 2 Preparation of CO gas by decarbonization reaction 2 +C→2CO]Indirectly increasing carbon emissions.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to obtain a high amount of CO in a metallurgical system by using a process without additional carbon input 2 The gas resource is utilized and the CO gas is efficiently prepared.
The basic principle of the invention is as follows:
based on this, the applicant proposed to transform the steel-making induction furnace into a closed gas-making furnace, CO 2 Or containing high concentrations of CO 2 The industrial tail gas is used as raw material gas and is introduced into an oxygen saturated iron-based melt at 1600-1800 ℃ from a bottom blowing element to prepare high-concentration CO gas, CO 2 The deoxidized product FeO is transferred to a slag phase, and oxygen removal and iron reduction regeneration are realized in an external electric field mode to construct CO taking oxygen saturated iron-based melt solute iron element as an oxygen transfer medium 2 Method for preparing CO by carbon-free deoxidation and CO 2 The energy required by decomposition heat absorption and slag electrochemical reduction heat consumption can be generated by a photovoltaic, wind, hydraulic or nuclear power generation device, and CO is realized without additional carbon input by taking green electricity as an energy carrier 2 The carbon neutral cycle process coupled with the high-efficiency mass energy conversion of CO and the steel-chemical CO-production is opened, and the method has good application and development prospects.
The invention firstly provides CO 2 The system and the method for preparing CO gas by carbon-free deoxidation comprise a closed gas making furnace, an electromagnetic induction heating coil and an external direct current power supply electrolysis system; the gas-phase resultant generated by the closed gas-making furnace is connected to a gas-phase resultant dust removal device through a first pipeline, and the purified gas-phase resultantThe gas-phase product after cooling is connected with a gas-phase component detection device through a third pipeline and then connected with a first supercharger through a fourth pipeline, the gas-phase product after supercharging is connected with a pneumatic three-way ball valve through a fifth pipeline, a first outlet of the pneumatic three-way ball valve is connected with a gas separation device through a sixth pipeline, and a second outlet of the pneumatic three-way ball valve is used for emptying; the high-purity CO gas prepared by the gas separation device is connected to the inlet of a second booster through a seventh pipeline, and the high-purity CO gas is pressurized, conveyed through an eighth pipeline and stored in a CO gas storage cabinet; high purity CO produced by gas separation device 2 The gas is connected with the first stop valve through a ninth pipeline and then is connected to the inlet of the third booster through a tenth pipeline, and the high-purity CO is obtained 2 The pressurized gas is transported through an eleventh pipeline and stored in CO 2 A gas storage tank; exogenous high purity CO 2 The gas is connected with the second stop valve through a twelfth pipeline and then is conveyed to CO through a thirteenth pipeline 2 Gas storage tank, CO 2 High purity CO of gas storage tank 2 Gas is connected to a cold fluid inlet of the heat exchanger through a fourteenth pipeline, is connected with a third stop valve through a fifteenth pipeline after heat exchange, is connected to a pressure flow regulating valve through a sixteenth pipeline, and high-purity CO after pressure flow regulation 2 Gas is introduced into CO from the seventeenth pipeline 2 The inlet of the gas flowmeter is connected with a bottom blowing element arranged at the bottom of the closed gas making furnace through an eighteenth pipeline after flow measurement; and a gas-phase product generated by the positive electrode of the external direct-current power supply is connected to the fourth supercharger and the fourth stop valve through the positive electrode sealing device and a nineteenth pipeline.
Furthermore, the tonnage of the closed gas making furnace is 5t to 100t, the electromagnetic induction heating coil is arranged outside the furnace body of the closed gas making furnace, and the electrolysis system with the external direct-current power supply is arranged at the upper part of the closed gas making furnace.
Furthermore, the device also comprises a storage bin arranged at the upper part of the closed gas making furnace.
Further, the water vapor generated by the heat exchanger is conveyed to a water vapor inlet of the gas separation device through a nineteenth pipeline for regeneration and separation of the adsorbed gas.
Further, CO 2 The energy required by decomposition heat absorption and slag direct-current electrolytic reduction heat consumption is generated by a photovoltaic, wind, hydraulic or nuclear power generation device.
The invention also provides a method for utilizing CO 2 The method for preparing CO gas by carbon-free deoxidation comprises the following steps:
(1) Providing a CO as claimed in claim 1 2 A system for preparing CO gas by carbon-free deoxidation;
(2) Entering an oxygen saturation iron-based melt preparation stage, filling electrolytic pure iron serving as a molten pool metal phase raw material into a closed gas making furnace, adding high-purity magnesium oxide serving as a slag regulator, electrifying to melt the metal phase raw material, raising the temperature of a molten pool to over 1600 ℃, and adding external high-purity CO 2 Gas storage in CO 2 In the gas storage tank, the gas passes through a heat exchanger, a pneumatic ball valve, a pressure flow regulating valve and CO 2 The gas flowmeter is connected with the inlet of the bottom blowing element; continuously introducing high-purity CO from a bottom blowing element at the bottom of the closed gas making furnace 2 Gas, gas phase products in the melting process are subjected to dust removal and heat exchange, and then an online gas phase component detection device is used for detecting CO gas and CO in gas phase 2 Gas volume fraction, namely completing the preparation stage of the oxygen saturated iron-based melt when the volume fraction of CO gas in the gas-phase product reaches more than 85%;
(3) Entering the stage of CO gas preparation and oxidation product reduction, and continuously introducing high-purity CO into the oxygen-saturated iron-based melt through a bottom blowing element arranged at the bottom of the closed gas making furnace 2 Gas is led into a gas separation device after dust removal and heat exchange to respectively obtain high-purity CO gas and high-purity CO 2 The gas and CO gas enter a CO gas storage tank, and CO 2 Gas admission to CO 2 A gas storage tank; meanwhile, inserting the anode of an external direct current power supply into the molten slag, inserting the cathode of the external direct current power supply into the iron-based melt, electrifying the external direct current power supply to reduce FeO in the oxidation product molten slag into liquid iron and oxygen, returning the liquid iron to the iron-based melt again, and finishing CO 2 The process of preparing CO gas by carbon-free deoxidation.
(4) And entering a furnace charge supplementing stage, switching bottom blowing gas of the closed gas making furnace into high-purity argon after the system runs for a period, setting the pneumatic three-way ball valve into an emptying mode, discharging a gas-phase product into an atmospheric environment, supplementing electrolytic pure iron and high-purity magnesium oxide into the molten pool through the storage bin, and recovering to a CO gas preparation and oxidation product reduction stage after the iron-based raw material and slag materials are newly added into the molten pool and are completely melted.
Further, in the step (2), the power of the heating element of the closed gas making furnace 1 is set to 3000kW to 50000kW, and high purity CO is blown in from the bottom blowing element 2 Gas gauge pressure of 0.2-0.4MPa and flow rate of 10-200Nm 3 /h。
Further, in the step (3), the current range of the external direct current power supply is set to be 1-300kA, and the voltage is set to be 10-1000V.
Further, in the step (3), the power of the heating element of the closed gas making furnace is set to 1000-20000kW, and high purity CO is blown from the bottom blowing element 2 The gas gauge pressure is 0.3-0.6MPa, and the flow rate is 20-500Nm 3 High purity CO/h 2 A gas.
Further, in the step (4), the high purity argon gas is blown from the bottom blowing element at a gauge pressure of 0.2 to 0.4MPa and a flow rate of 10 to 200Nm 3 /h。
Furthermore, the electromagnetic induction heating coil is arranged outside the furnace body of the closed gas making furnace, the storage bin is arranged at the upper part of the closed gas making furnace, and the external direct-current power supply electrolysis system is arranged at the upper part of the closed gas making furnace.
Further, the water vapor generated by the heat exchanger is conveyed to the water vapor inlet of the gas separation device through a nineteenth pipeline for regeneration and separation of the adsorbed gas.
The beneficial effects of the invention include:
(1) Can use tail gas generated in the production process of the steel industry or the chemical industry to process CO 2 High concentration CO obtained after concentration 2 The gas is used as reaction gas to react with the oxygen saturated iron-based melt to generate tail gas with high CO concentration (the volume fraction of the CO gas is more than 85 percent), thereby realizing the CO 2 The gas consumption and the efficient preparation of important chemical raw material CO gas;
(2) The process of the invention utilizes a high-temperature molten pool at 1600-1800 ℃ as a reaction environment, and can effectively break through CO 2 Energy barrier of decomposition, high and stable reaction rate, and no need of CO in the field of traditional chemical industry 2 A large amount of expensive catalysts are used in the reduction process, the process is simple, the cost is low, and the preparation efficiency is high;
(3) CO using oxygen saturated iron-based melt solute iron element as oxygen transfer medium 2 Novel method for preparing CO based on CO by carbon-free deoxidation 2 The deoxidation mode of the high iron oxide slag applied with an electric field is coupled with the high-efficiency stable decomposition characteristic of the oxygen-saturated iron-based melt, so that the traditional carbon-reduced CO in the steel smelting process is changed 2 A resource utilization mode;
(4) The electric energy used by the device is generated by a photovoltaic power generation device, a wind power generation device, a water conservancy power generation device or a nuclear power generation device, so that the 'electricity-energy' conversion between green electric power and CO gas is realized;
the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a preferred embodiment of the present invention utilizing CO 2 A process flow diagram of a system for preparing CO gas by carbon-free deoxidation;
FIG. 2 is a schematic view of a closed gas-generating furnace in accordance with a preferred embodiment of the present invention;
fig. 3 is a partially enlarged view of a point a in fig. 2.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
7. As shown in FIG. 1, a method for utilizing CO according to the present invention 2 The system for preparing CO gas by carbon-free deoxidation comprises a closed gas making furnace 1, wherein a gas-phase resultant generated by the closed gas making furnace 1 is connected to a gas-phase resultant dust removal device 3 through a pipeline P1, the purified gas-phase resultant enters a hot fluid inlet of a heat exchanger 4 through a pipeline P2, and the cooled gas-phase resultant is communicated with a gas inlet of a gas-phase heat exchangerThe pipeline P3 is connected with the gas phase component detection device 5, then the pipeline P4 is connected with the supercharger 61, the pressurized gas phase product is connected with the pneumatic three-way ball valve 7 through the pipeline P5, one outlet of the pneumatic three-way ball valve 7 is connected with the gas separation device 8 through the pipeline P6, the other outlet of the pneumatic three-way ball valve 7 is used for emptying, the high-purity CO gas prepared by the gas separation device 8 is connected to the inlet of the supercharger 62 through the pipeline P7, the high-purity CO gas is conveyed and stored in the CO gas storage cabinet 9 through the pipeline P8 after being pressurized, and the high-purity CO prepared by the gas separation device 8 is stored in the CO gas storage cabinet 9 2 The gas is connected with a stop valve 101 through a pipeline P9, and then is connected to the inlet of a supercharger 63 through a pipeline P10, and high-purity CO is obtained 2 The gas is pressurized, conveyed through a pipeline P11 and stored in CO 2 Gas holder 11, high purity CO from outside 2 The gas is connected to the shut-off valve 102 via line P12 and then delivered to the CO via line P13 2 Gas storage holder 11, CO 2 High purity CO of gas storage tank 11 2 Gas is connected to a cold fluid inlet of the heat exchanger 4 through a pipeline P14, is connected with the stop valve 103 through a pipeline P15 after heat exchange, is connected to a pressure flow regulating valve P17 through a pipeline P16, and high-purity CO after pressure flow regulation 2 Gas is introduced into CO from pipeline P17 2 The device comprises a gas flowmeter inlet, a bottom blowing element 14 arranged at the bottom of a sealed gas making furnace 1 after flow measurement is connected through a pipeline P18, water vapor generated by a heat exchanger 4 is conveyed to a water vapor inlet of a gas separation device 8 through a pipeline P19 and is used for regeneration and separation of adsorbed gas, an electromagnetic induction heating coil 15 is arranged outside a furnace body of the sealed gas making furnace 1, an external direct-current power supply cathode 16 and an external direct-current power supply anode 17 are arranged at the upper part of the sealed gas making furnace 1, an anode sealing pipe 18 is arranged outside the external direct-current power supply anode and is connected into a draught fan or a vacuum pump 64 and a stop valve 104 through the pipeline P19. CO 2 2 The energy required by decomposition heat absorption and slag direct-current electrolytic reduction heat consumption is generated through photovoltaic power generation.
According to the invention, CO is utilized 2 A method of producing CO gas comprising the steps of:
in the stage of preparing oxygen saturated iron-based melt, 10t of electrolytic pure iron is used as a molten pool metal phase raw material and is filled into a closed gas making furnace 1, 0.5t of high-purity magnesium oxide is added as a slag regulator, and the power of a heating element of the closed gas making furnace 1 is set to be 6000kW, electrifying to melt the raw material 19 of the metal phase, raising the temperature of the molten pool to 1600 ℃, and introducing high-purity CO 2 Gas storage in CO 2 In the gas storage tank 11, and passes through the heat exchanger 4, the pneumatic ball valve 103, the pressure flow control valve 12 and the CO 2 The gas flowmeter 13 is connected to the inlet of the bottom blowing element 14; continuously introducing gauge pressure of 0.2MPa and flow rate of 20Nm from a bottom blowing element 14 arranged at the bottom of the closed gas making furnace 1 3 H high purity CO 2 Gas, gas phase products in the melting process are dedusted and heat exchanged, and then the on-line gas phase component detection device 5 is used for detecting CO gas and CO in the gas phase 2 And (3) gas volume fraction, namely completing the preparation stage of the oxygen saturated iron-based melt when the CO gas volume fraction in the gas-phase product reaches more than 85% after 2 hours.
Entering a stage of CO gas preparation and oxidation product reduction, setting the power of a heating element of the closed gas making furnace 1 to be 2000kW, and continuously introducing gauge pressure of 0.3MPa and flow of 50Nm into the oxygen saturated iron-based melt through a bottom blowing element 14 arranged at the bottom of the closed gas making furnace 1 3 High purity CO/h 2 Gas, simultaneously, a negative electrode 16 of an electrolysis system with an external direct current power supply arranged at the upper part of the closed gas making furnace is lowered into the iron-based melt, a positive electrode 17 is lowered into the slag, the electrifying voltage is set to be 200V, the current is set to be 20kA, the volume fraction of CO gas in the gas-phase product is 85.75 percent, and CO is generated 2 The gas volume fraction is 14.25%, and the gas is introduced into a gas separation device 8 after dust removal and heat exchange to respectively obtain high-purity CO gas and high-purity CO 2 The gas and the CO gas enter a CO gas storage tank 9 2 Gas admission to CO 2 A gas holder 11.
The bottom blowing gas of the closed gas making furnace 1 is switched into high-purity argon after the system runs for 72 hours, the gauge pressure is 0.2MPa, and the flow rate is 20Nm 3 And/h, setting the pneumatic three-way ball valve 7 to be in an emptying mode, discharging a gas-phase product to the atmospheric environment, adding 50kg of high-purity magnesium oxide into the molten pool through a bin 2 arranged at the upper part of the closed gas making furnace, electrolyzing 100kg of pure iron, and switching the production process to a stage of CO gas preparation and oxidation product reduction after the newly added raw materials in the molten pool are completely melted after 15 minutes.
In this example, the number of days the device was operatedThe consumption of CO can be reduced for 300 days 2 Gas about 600t, CO gas about 308700Nm 3 。
Unlike the prior art that carbon raw materials such as graphite powder and the like are used as reducing agents to reduce a deoxidation product FeO in a slag phase, the method adopts a deoxidation mode of adding an electric field outside iron oxide slag for regeneration, thereby getting rid of the traditional mode of carbon reduction, and although electric energy is consumed, the electric energy can come from clean energy sources such as hydroelectric power, wind power, nuclear power and the like, so as to realize carbon-free deoxidation.
As shown in fig. 2, the present invention further provides a positive sealing tube 18 outside the positive electrode 17, and the positive sealing tube 18 is connected to a vacuum pump 64. When the anode 17 descends into the slag 20, the vacuum pump 64 is started simultaneously, on one hand, oxygen generated at the anode is discharged, the oxygen partial pressure is reduced, the reaction speed is accelerated, on the other hand, a certain vacuum degree is made in the anode sealing tube 18, so that part of the liquid slag phase 20 is sucked into the anode sealing tube 18, the contact area of the liquid slag phase 20 in the anode 17 is increased, and the electrolysis efficiency is improved.
As shown in fig. 3, the bottom of the positive sealing tube 18 of the present invention has a porous section 22, and the iron-based melt 19 and the slag 20 outside the porous section 22 can enter the positive sealing tube 18 through the porous section 22, so that even if the depth of the positive sealing tube 18 crosses the two-phase boundary 21 of the iron slag when it is lowered, so that part of the melt 19 enters the positive sealing tube 18, it will fall because its density is greater than that of the slag phase, therefore, the control of the falling depth of the positive sealing tube 18 can have a certain fault tolerance, and the requirement of precise control of the falling depth of the positive sealing tube 18 is reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. By using CO 2 The system and the method for preparing CO gas by carbon-free deoxidation are characterized by comprising a closed gas making furnace, an electromagnetic induction heating coil and an external direct current power supply electrolysis system; the gas-phase product generated by the closed gas making furnace is connected to a gas-phase product dust removal device through a first pipeline, the purified gas-phase product enters a hot fluid inlet of a heat exchanger through a second pipeline, the cooled gas-phase product is connected with a gas-phase component detection device through a third pipeline and then is connected with a first supercharger through a fourth pipeline, the supercharged gas-phase product is connected with a pneumatic three-way ball valve through a fifth pipeline, a first outlet of the pneumatic three-way ball valve is connected with a gas separation device through a sixth pipeline, and a second outlet of the pneumatic three-way ball valve is used for emptying; the high-purity CO gas prepared by the gas separation device is connected to the inlet of a second booster through a seventh pipeline, and the high-purity CO gas is pressurized, conveyed through an eighth pipeline and stored in a CO gas storage cabinet; high purity CO produced by gas separation device 2 The gas is connected with the first stop valve through a ninth pipeline and then is connected to the inlet of the third booster through a tenth pipeline, and the high-purity CO is obtained 2 The pressurized gas is transported through an eleventh pipeline and stored in CO 2 A gas storage tank; exogenous high purity CO 2 The gas is connected with the second stop valve through a twelfth pipeline and then is conveyed to CO through a thirteenth pipeline 2 Gas storage tank, CO 2 High purity CO of gas storage tank 2 Gas is connected to a cold fluid inlet of the heat exchanger through a fourteenth pipeline, is connected with a third stop valve through a fifteenth pipeline after heat exchange, is connected to a pressure flow regulating valve through a sixteenth pipeline, and high-purity CO after pressure flow regulation 2 Introducing gas into CO via seventeenth pipeline 2 And the inlet of the gas flowmeter is connected with a bottom blowing element arranged at the bottom of the closed gas making furnace through an eighteenth pipeline after flow measurement.
2. The utilization of CO as claimed in claim 1 2 The system for preparing CO gas by carbon-free deoxidation is characterized in that the tonnage of a closed gas making furnace is 5t to 100t, an electromagnetic induction heating coil is arranged outside a furnace body of the closed gas making furnace, and an external direct-current power supply electrolysis system is arranged at the upper part of the closed gas making furnace.
3. The utilization of CO as claimed in claim 1 2 The system for preparing CO gas by carbon-free deoxidation also comprises a storage bin arranged at the upper part of the closed gas making furnace.
4. The utilization of CO as claimed in claim 1 2 And in the system for preparing the CO gas by the carbon-free deoxygenation, the water vapor generated by the heat exchanger is conveyed to a water vapor inlet of the gas separation device through a nineteenth pipeline and is used for regeneration and separation of the adsorbed gas.
5. The utilization of CO as claimed in claim 1 2 System for preparing CO gas by carbon-free deoxidation, wherein CO 2 The energy required by decomposition heat absorption and slag direct-current electrolytic reduction heat consumption is generated by a photovoltaic, wind power, hydraulic or nuclear power generation device.
6. By using CO 2 The method for preparing CO gas by carbon-free deoxidation is characterized by comprising the following steps:
(1) Providing a process utilizing CO as claimed in claim 1 2 A system for preparing CO gas by carbon-free deoxidation;
(2) Entering an oxygen saturation iron-based melt preparation stage, filling electrolytic pure iron serving as a molten pool metal phase raw material into a closed gas making furnace, adding high-purity magnesium oxide serving as a slag regulator, electrifying to melt the metal phase raw material, raising the temperature of a molten pool to over 1600 ℃, and adding external high-purity CO 2 Gas storage in CO 2 In the gas storage tank, the gas passes through a heat exchanger, a pneumatic ball valve, a pressure flow regulating valve and CO 2 The gas flowmeter is connected with the inlet of the bottom blowing element; continuously introducing high-purity CO from a bottom blowing element at the bottom of the closed gas making furnace 2 Gas, gas phase products in the melting process are subjected to dust removal and heat exchange, and then an online gas phase component detection device is used for detecting CO gas and CO in gas phase 2 Gas volume fraction, namely completing the preparation stage of the oxygen saturated iron-based melt when the volume fraction of CO gas in the gas-phase product reaches more than 85%;
(3) Entering the stage of CO gas preparation and oxidation product reduction, passing through the bottom arranged at the bottom of the closed gas making furnaceBlowing element to continuously introduce high-purity CO into oxygen-saturated iron-based melt 2 The gas is introduced into a gas separation device after dust removal and heat exchange to respectively obtain high-purity CO gas and high-purity CO 2 The gas and CO gas enter a CO gas storage tank, and CO 2 Gas admission to CO 2 A gas storage tank; meanwhile, inserting the anode of an external direct current power supply into the molten slag, inserting the cathode of the external direct current power supply into the iron-based melt, electrifying the external direct current power supply to reduce FeO in the oxidation product molten slag into liquid iron and oxygen, returning the liquid iron to the iron-based melt again, and finishing CO 2 The process of preparing CO gas by carbon-free deoxidation.
(4) And entering a furnace charge supplementing stage, switching bottom blowing gas of the closed gas making furnace into high-purity argon after the system operates for a period, setting the pneumatic three-way ball valve into an emptying mode, discharging a gas-phase product into an atmospheric environment, supplementing electrolytic pure iron and high-purity magnesium oxide into a molten pool through a storage bin, and recovering to a CO gas preparation and oxidation product reduction stage after an iron-based raw material and slag are newly added into the molten pool and are completely melted.
7. The utilization of CO as claimed in claim 1 2 In the step (2), the power of a heating element of the closed gas making furnace 1 is set to be 3000kW-50000kW, and high-purity CO is blown in from a bottom blowing element 2 Gas gauge pressure of 0.2-0.4MPa and flow rate of 10-200Nm 3 H; in the step (3), setting the current range of the external direct current power supply to be 1-300kA and the voltage to be 10-1000V; wherein, in the step (3), the power of the heating element of the closed gas making furnace is set to be 1000-20000kW, and high-purity CO is blown in from the bottom blowing element 2 The gas gauge pressure is 0.3-0.6MPa, and the flow rate is 20-500Nm 3 H high purity CO 2 A gas.
8. The utilization of CO as claimed in claim 1 2 The method for preparing CO gas by carbon-free deoxidation comprises the step (4) of blowing high purity argon gas from a bottom blowing element with gauge pressure of 0.2-0.4MPa and flow rate of 10-200Nm 3 /h。
9. The utilization of CO as claimed in claim 1 2 The method for preparing CO gas by carbon-free deoxidation is characterized in that an electromagnetic induction heating coil is arranged outside a furnace body of a closed gas making furnace, a storage bin is arranged at the upper part of the closed gas making furnace, and an electrolysis system with an external direct-current power supply is arranged at the upper part of the closed gas making furnace.
10. The utilization of CO as claimed in claim 1 2 The method for preparing CO gas by carbon-free deoxygenation is characterized in that water vapor generated by a heat exchanger is conveyed to a water vapor inlet of a gas separation device through a nineteenth pipeline and is used for regeneration and separation of adsorbed gas.
CN202211046621.4A 2022-08-30 2022-08-30 By using CO 2 System and method for preparing CO gas by carbon-free deoxidation Pending CN115466987A (en)

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