Hydrogen-rich blast furnace ironmaking device

Abstract

The utility model belongs to the technical field of ironmaking, and particularly relates to a blast furnace hydrogen-rich ironmaking device. The steel plant waste heat boiler is connected with the steam pipeline; the steam pipeline is connected with the electrolytic hydrogen production device; the cathode of the electrolytic hydrogen production device is sequentially connected with a heat exchanger I, a heat exchanger III, a steam-water separator and an H2 pressurizing machine through an H2 pipeline; the H2 pressurizing machine is connected with an H2 heating furnace and is sequentially connected with a hydrogen ring pipe, a furnace body hydrogen spray gun and a blast furnace; the anode of the electrolytic hydrogen production device is sequentially connected with a heat exchanger II and an oxygen pressurizing machine through an O2 pipeline; the oxygen pressurizing machine is connected or disconnected with the hot-blast stove and is sequentially connected with the air supply bustle pipe, the blast-furnace tuyere and the blast furnace through the air supply pipeline; the technology has the advantages that electrolytic hydrogen production and blast furnace hydrogen-rich smelting are coupled, the electrolytic hydrogen production device uses steel plant waste heat steam as an electrolytic hydrogen production raw material, hydrogen produced by electrolytic hydrogen production and byproduct oxygen are used for blast furnace hydrogen-rich smelting, and CO2 emission during iron making is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of ironmaking technology, specifically relating to hydrogen-rich blast furnace smelting technology. Background Technology

[0002] Hydrogen, as a clean energy source, can replace some of the carbonaceous raw materials used in blast furnace smelting through hydrogen-enriched smelting technology. This effectively reduces carbon emissions in the ironmaking process, significantly improves the blast furnace's utilization efficiency, and yields remarkable energy savings and carbon reduction. It is estimated that using hydrogen-enriched smelting in blast furnaces can reduce CO2 emissions by 28 tons per ton of hydrogen produced. How to utilize green electricity to produce hydrogen, providing non-carbonaceous energy and reducing agents to blast furnaces, and mitigating the high carbon emissions resulting from a coal-dominated energy structure, is of great significance for promoting the transformation and upgrading of blast furnace ironmaking.

[0003] Patent application 202210989945.5 discloses a hydrogen-rich blast furnace ironmaking system based on energy-mass conversion and its production control method. It includes an electrolysis water system connected to a hydrogen storage tank and an oxygen storage tank; the gas outlet of the hydrogen storage tank is connected to a hydrogen compressor; the outlet of the hydrogen compressor is connected to a hydrogen buffer tank; the hydrogen buffer tank is connected to a hydrogen injection valve assembly; the hydrogen injection valve assembly is connected to a hydrogen preheating system; and the hydrogen preheating system is connected to the tuyeres of the blast furnace body or a hydrogen injection device at the bottom of the furnace.

[0004] Patent application 202310196356.6 discloses a blast furnace ironmaking equipment and process. The blast furnace ironmaking equipment includes a blast furnace body, a dust removal system, a heating and pressurizing system, a waste heat utilization and cooling system, and a carbon dioxide separation and treatment system. Specifically, the flue gas flowing from the blast furnace body's outlet is dusted by the dust removal system, and a portion of it is cooled by the waste heat utilization and cooling system before entering the carbon dioxide separation and treatment system to separate the coal gas and carbon dioxide in the cooled flue gas. The separated coal gas then enters the heating and pressurizing system, while the separated carbon dioxide is heated by the waste heat utilization and cooling system before entering the heating and pressurizing system. The remaining portion of the flue gas, after dust removal by the dust removal system, powers the heating and pressurizing system to heat and pressurize the carbon dioxide and coal gas entering the system before being fed into the blast furnace body.

[0005] Based on the aforementioned patents and technical documents, the following problems exist in the current hydrogen-rich smelting process in blast furnaces of steel enterprises:

[0006] Blast furnace gas contains a large amount of CO2, which reduces the calorific value and reducing properties of the gas. Although various existing processes can effectively remove CO2 from the gas, there is no good way to utilize the removed CO2. Using hydrogen-rich smelting in blast furnaces can reduce carbon emissions, but there is no good solution for the supply of hydrogen.

[0007] In addition, steel enterprises generate a large amount of waste heat, including waste heat boilers from the annular coolers used to cool sintered ore in the sintering process, steam generated from steelmaking exhaust hoods, and steam from the utilization of waste heat in heating furnaces. However, using this steam for waste heat power generation is inefficient. How to efficiently utilize waste heat has become a pressing issue for steel enterprises. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the purpose of this invention is to realize the recycling of enriched gas after CO2 removal from blast furnace top gas, the utilization of CO2 removal, and the electrolysis of CO2 and steam to produce CO+H2 for hydrogen-rich smelting in blast furnaces, thereby reducing CO2 emissions from blast furnaces.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] The hydrogen-rich blast furnace ironmaking unit includes an electrolytic hydrogen production unit, a blast furnace system, and a waste heat boiler for the steel plant; the electrolytic hydrogen production unit includes an SOEC solid oxide electrolytic cell.

[0011] The waste heat boiler of the steel plant is connected to the feed pipeline, which is connected to the electrolytic hydrogen production device; the water supply pipeline is connected to the feed pipeline.

[0012] The electrolytic hydrogen production unit is connected in sequence to a gas-liquid separator, buffer tank I, H2 compressor, and blast furnace via an H2 pipeline;

[0013] The electrolytic hydrogen production device is connected in sequence to buffer tank II, oxygen compressor, air supply pipe, blast furnace tuyeres and blast furnace via an O2 pipeline;

[0014] The air compressor is connected to the electrolysis hydrogen production unit.

[0015] The power supply is connected to the electrolysis hydrogen production unit.

[0016] Preferably, the blast furnace is connected in sequence to a gas dust removal device, a TRT device, gas pipeline I, and a gas pipeline network via a gas pipeline.

[0017] Preferably, the blast furnace is connected in sequence to a gas dust removal device, a TRT device, a gas dehydration and desulfurization device, and a blast furnace gas CO2 removal device via a gas pipeline.

[0018] Preferably, the blast furnace gas CO2 removal device is connected to the feed pipe via a CO2 pipeline.

[0019] Preferably, the enriched gas generated by the blast furnace gas CO2 removal device is connected to the H2 pipeline through an enriched gas pipeline.

[0020] Preferably, the H2 pressurizer is connected in sequence to the H2 distributor, the tuyeres H2 spray gun, and the blast furnace.

[0021] Preferably, the H2 pressurizer is connected in sequence to the H2 heating furnace, the H2 ring pipe, the furnace body hydrogen spray gun, and the blast furnace.

[0022] Preferably, the hydrogen spray guns are installed at the lower part of the blast furnace body or at the waist of the furnace; the number of hydrogen spray guns is greater than or equal to 20.

[0023] Preferably, the gas-liquid separator is connected to the feed pipe.

[0024] Preferably, the oxygen compressor and the air supply pipe are further connected to a blast furnace blower and a hot blast stove; the air supply pipe is connected in sequence to the blast furnace tuyeres and the blast furnace.

[0025] Preferably, an oxygen generator is also connected after the oxygen compressor.

[0026] Preferably, the electricity is generated from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. It makes full use of the steam generated by the waste heat utilization of steel enterprises as the raw material for electrolytic hydrogen production. The generated hydrogen-rich gas and oxygen-rich gas are used in the blast furnace, organically combining electrolytic hydrogen production with blast furnace hydrogen-rich smelting to maximize efficiency.

[0029] 2. Injecting high-temperature H2 and CO into the blast furnace body increases the indirect reduction degree of iron ore powder, reduces the direct reduction reaction of iron ore powder in the blast furnace hearth, reduces blast furnace coke consumption, increases hearth temperature, and reduces CO2 emissions from blast furnace ironmaking.

[0030] 3. The CO2 removed from the blast furnace top gas is used as raw material for the electrolytic hydrogen production unit. The CO2 is electrolyzed to produce CO and O2, which are fully utilized by the blast furnace, and the CO2 emissions are reduced.

[0031] 4. The electrolytic hydrogen production unit utilizes steam generated from waste heat boilers in steel plants to produce H2, reducing the electricity consumption for hydrogen production. Attached Figure Description

[0032] Figure 1 Schematic diagram of hydrogen-rich blast furnace ironmaking unit and process Figure I

[0033] Figure 2 Schematic diagram of hydrogen-rich blast furnace ironmaking unit and process Figure II

[0034] Figure 3 Schematic diagram of hydrogen-rich blast furnace ironmaking unit and process Figure III

[0035] Figure 4 Schematic diagram of hydrogen-rich blast furnace ironmaking unit and process Figure IV

[0036] Legend markings

[0037] 101 Electrolytic hydrogen production unit, 102 Power supply, 103 Air compressor, 104 Waste heat boiler for steel enterprises, 105 Oxygen compressor, 106 Water supply pipeline, 107 Buffer tank I, 108 Buffer tank II, 109 O2 pipeline, 110 Gas-water separator, 111 H2 pipeline, 112 Feed pipeline.

[0038] 201 Blast Furnace, 202H2 Ring Pipe, 203 Furnace Body Hydrogen Injector, 204 Blast Air Pipe, 205H2 Distributor, 206H2 Injector, 207H2 Heating Furnace, 208H2 Pressurizer, 209 Hot Blast Stove, 210 Blast Furnace Blower, 211 Gas Pipeline I, 212 Gas Pipeline II, 213 Gas Pipeline Network, 214 Gas Pipeline III, 215 Gas Dust Removal Device, 216 TRT Device, 217 Gas Dehydration and Desulfurization Device, 218 Gas Pipeline, 219 Gas CO2 Removal Device, 220 CO2 Pipeline, 221 Blast Furnace Tunnels, 222 Enriched Gas Pipeline, 223 Oxygen Generator. Specific Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement it. The present invention may be embodied in many different forms and is not limited thereto.

[0040] Example 1 with appendix Figure 1 For reference, the following explanation is provided:

[0041] The hydrogen-rich blast furnace ironmaking device that realizes this technical solution is characterized by including an electrolytic hydrogen production device, a blast furnace system, and a waste heat boiler in a steel plant; the electrolytic hydrogen production device includes an SOEC solid oxide electrolytic cell.

[0042] The waste heat boiler 104 of the steel plant is connected to the feed pipe 112, and the feed pipe 112 is connected to the electrolytic hydrogen production device 101; the water supply pipe 106 is connected to the feed pipe 112.

[0043] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 distributor 205, tuyer H2 spray gun 206, and blast furnace 201 via H2 pipeline 111.

[0044] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 heater 207, H2 loop pipe 202, furnace body hydrogen spray gun 203, and blast furnace 201 via H2 pipeline 111.

[0045] Gas pipeline 213 connects to H2 heating furnace 207 via gas pipeline Ⅲ 214.

[0046] The electrolytic hydrogen production device 101 is connected in sequence to buffer tank II 108, oxygen compressor 105, air supply pipe 204, blast furnace tuyeres 221, and blast furnace 201 via O2 pipe 113; oxygen compressor 105 is also connected to oxygen generator 223.

[0047] The power supply 102 is connected to the electrolysis hydrogen production device 101.

[0048] Blast furnace 201 is connected to gas dust removal device 215 and TRT device 216 via gas pipeline 218. One TRT device 216 is connected to gas pipeline network 213 via gas pipeline I 211, and the other is connected to gas dehydration and desulfurization device 217 and blast furnace gas CO2 removal device 219 in sequence.

[0049] Gas pipeline 213 is connected to H2 heating furnace 207.

[0050] The CO2 removal device 219 for blast furnace gas is connected to the feed pipe 112 via the CO2 pipe 220.

[0051] The enriched gas produced by the CO2 removal device 219 of the blast furnace gas is connected to the H2 pipeline 111 through the enriched gas pipeline 222;

[0052] The hydrogen spray gun 203 is installed at the lower part of the blast furnace body or at the waist of the blast furnace 201; the number of hydrogen spray guns 203 is greater than or equal to 20.

[0053] The gas-water separator 110 is connected to the feed pipe 112.

[0054] The electricity mentioned comes from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises.

[0055] The process of this invention is as follows:

[0056] Steam from the waste heat boiler 104 of the steel plant is supplied to the electrolytic hydrogen production unit 101 as raw material for the electrolytic hydrogen production unit 101.

[0057] Hydrogen-rich gas produced by the electrolytic hydrogen production unit 101 is dehydrated by a gas-liquid separator, and then mixed with enriched gas from the CO2 removal unit 219. Both mixtures are then pressurized in the H2 compressor 208. The pressurized gas is injected into the blast furnace 201 via an H2 distributor 205 and an H2 spray gun 206; the other gas is heated to ≥900℃ in the H2 heater 207 and injected into the blast furnace 201 through the H2 ring pipe 202 and the furnace body H2 spray gun 203. The main components of the enriched coal gas are CO and H2. The main component of the hydrogen-rich gas is H2.

[0058] The blast furnace top gas of blast furnace 201 is degassed by a gas degassing CO2 removal device 219, and the degassed CO2 is used as raw material for the electrolytic hydrogen production device 101.

[0059] The condensate separated by the gas-water separator 110 is sent to the water supply pipeline 106 and then to the electrolytic hydrogen production unit 101 via the feed pipeline 112, serving as the raw material for the electrolytic hydrogen production unit 101.

[0060] Power supply 102 supplies power to the electrolysis hydrogen production device 101.

[0061] The electricity for the electrolytic hydrogen production device 101 comes from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises, with green electricity being preferred.

[0062] The raw materials used in the electrolytic hydrogen production device 101 are one or more of water, steam, and CO2.

[0063] The steam generated by the waste heat boiler 104 in the steel plant is one or more of the steam generated by the waste heat boiler of the sintering ring cooler, the steam generated by the gasification flue of steelmaking, the waste heat boiler of the dry quenching coke oven, the waste heat recovery of the coke oven riser pipe, and the waste heat boiler of the flue gas of the steel rolling heating furnace.

[0064] The blast furnace pulverized coal injection device is connected to the blast furnace tuyeres via a pulverized coal distributor, with a pulverized coal injection rate of 100 kg / tFe.

[0065] H2 and CO at ≥900℃ are injected into the blast furnace 201 through the H2 lance 203 in the furnace body, and participate in the reduction reaction as reducing agents to improve the indirect reduction degree of iron ore; H2 and CO at room temperature are injected into the blast furnace through the H2 lance 206 from the blast furnace tuyeres 221 as fuel, replacing part of the pulverized coal injection.

[0066] At 3200m 3 Taking a blast furnace as an example, the gas at the top of the blast furnace contains 435 Nm³. 3 / tFe is used for CO2 removal from blast furnace gas, producing 100 Nm³ of CO2. 3 / tFe is used in an electrolytic hydrogen production unit to generate 335Nm 3 / tFe enriched coal gas is injected into the blast furnace along with H2, CO, and CO2 discharged from the cathode of the electrolytic hydrogen production unit; 300Nm of steam is generated from the waste heat boiler of the steel plant. 3 / tFe is used in an electrolytic hydrogen production unit. The cathode of the electrolytic hydrogen production unit discharges H2, CO, and CO2: 200Nm. 3 / tFe, O2 discharged from the anode: 100Nm 3 / tFe. Blast furnace utilization coefficient: 3.0t / m 3 .d, Daily output: 9600t / d, coke ratio: 300kg / t, coal ratio: 100kg / tFe, blast furnace injection of H2, CO, CO2: 200Nm 3 / tFe and 100Nm 3 / tFe-enriched coal gas, oxygen enrichment rate: 14%, of which oxygen comes from the electrolytic hydrogen production unit: 100Nm³ 3 / tFe, oxygen from the oxygen concentrator: 50Nm 3 / tFe. Smelting results show that the blast furnace solid fuel ratio decreased by 20%, and CO2 emissions decreased by 20%.

[0067] Example 2 with appendix Figure 2 For reference, the following explanation is provided:

[0068] The hydrogen-rich blast furnace ironmaking device that realizes this technical solution is characterized by including an electrolytic hydrogen production device, a blast furnace system, and a waste heat boiler in a steel plant; the electrolytic hydrogen production device includes an SOEC solid oxide electrolytic cell.

[0069] The waste heat boiler 104 of the steel plant is connected to the feed pipe 112, and the feed pipe 112 is connected to the electrolytic hydrogen production device 101; the water supply pipe 106 is connected to the feed pipe 112.

[0070] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 distributor 205, tuyer H2 spray gun 206, and blast furnace 201 via H2 pipeline 111.

[0071] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 heater 207, H2 loop pipe 202, furnace body hydrogen spray gun 203, and blast furnace 201 via H2 pipeline 111.

[0072] The electrolytic hydrogen production device 101 is connected in sequence to buffer tank II 108, oxygen compressor 105, air supply pipe 204, blast furnace tuyeres 221, and blast furnace 201 via O2 pipe 113; oxygen compressor 105 is also connected to oxygen generator 223.

[0073] The power supply 102 is connected to the electrolysis hydrogen production device 101.

[0074] Blast furnace 201 is connected to gas dust removal device 215 and TRT device 216 via gas pipeline 218. One TRT device 216 is connected to gas pipeline network 213, and the other is connected to gas dehydration and desulfurization device 217 and blast furnace gas CO2 removal device 219 in sequence.

[0075] Gas pipeline 213 is connected to H2 heating furnace 207.

[0076] The CO2 removal device 219 for blast furnace gas is fed into the CO2 pipeline network via CO2 pipeline 220.

[0077] The enriched gas produced by the CO2 removal device 219 of the blast furnace gas is connected to the H2 pipeline 111 through the enriched gas pipeline 222;

[0078] The hydrogen spray gun 203 is installed at the lower part of the blast furnace body or at the waist of the blast furnace 201; the number of hydrogen spray guns 203 is greater than or equal to 32.

[0079] The gas-water separator 110 is connected to the feed pipe 112.

[0080] The electricity mentioned comes from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises.

[0081] The process of this invention is as follows:

[0082] Steam from the waste heat boiler 104 of the steel plant is supplied to the electrolytic hydrogen production unit 101 as raw material for the electrolytic hydrogen production unit 101.

[0083] Hydrogen-rich gas produced by the electrolytic hydrogen production unit 101 is dehydrated by a gas-liquid separator, then mixed with enriched gas from the CO2 removal unit 219 after CO2 removal, and finally pressurized in the H2 compressor 208. The pressurized gas is then heated to ≥900℃ in the H2 heater 207, and injected into the blast furnace 201 through the H2 loop pipe 202 and the H2 spray gun 203 in the furnace body. The main components of the enriched coal gas are CO and H2. The main component of the hydrogen-rich gas is H2.

[0084] The condensate separated by the gas-water separator 110 is sent to the water supply pipeline 106 and then to the electrolytic hydrogen production unit 101 via the feed pipeline 112, serving as the raw material for the electrolytic hydrogen production unit 101.

[0085] Power supply 102 supplies power to the electrolysis hydrogen production device 101.

[0086] The electricity for the electrolytic hydrogen production device 101 comes from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises, with green electricity being preferred.

[0087] The raw materials used in the electrolytic hydrogen production unit 101 are water and / or steam.

[0088] Steam generated by the waste heat boiler of the sintered ring cooler is used in the electrolytic hydrogen production unit 101.

[0089] H2 at ≥900℃ is injected into the blast furnace 201 through the H2 spray gun 203 in the furnace body, and participates in the reduction reaction as a reducing agent, thereby increasing the indirect reduction degree of iron ore and reducing carbon consumption.

[0090] Example 3 with appendix Figure 3 For reference, the following explanation is provided:

[0091] The hydrogen-rich blast furnace ironmaking device that realizes this technical solution is characterized by including an electrolytic hydrogen production device, a blast furnace system, and a waste heat boiler in a steel plant; the electrolytic hydrogen production device includes an SOEC solid oxide electrolytic cell.

[0092] The waste heat boiler 104 of the steel plant is connected to the feed pipe 112, and the feed pipe 112 is connected to the electrolytic hydrogen production device 101.

[0093] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 compressor 208, H2 heater 207, H2 loop pipe 202, furnace body hydrogen spray gun 203, and blast furnace 201 via H2 pipeline 111;

[0094] The electrolytic hydrogen production unit 101 is connected in sequence to the buffer tank II 108, the oxygen compressor 105, the blast furnace blower 210, the hot blast stove 209, the air supply pipe 204, the blast furnace tuyeres 221, and the blast furnace 201; an oxygen generator 223 is also connected between the oxygen compressor 105 and the blast furnace blower 210.

[0095] Gas pipeline 213 is connected to hot air furnace 209 via gas pipeline II 212; gas pipeline 213 is connected to H2 heating furnace 207 via gas pipeline III 214.

[0096] The power supply 102 is connected to the electrolysis hydrogen production device 101.

[0097] Blast furnace 201 is connected in sequence to gas dust removal device 215, TRT device 216 and gas pipeline network 213 via gas pipeline 218.

[0098] The gas-water separator 110 is connected to the feed pipe 112.

[0099] The electricity comes from wind power, solar power, TRT, and waste heat power generation from steel plants.

[0100] The process of this invention is as follows:

[0101] Steam from the waste heat boiler 104 of the steel plant is supplied to the electrolytic hydrogen production unit 101 as raw material for the electrolytic hydrogen production unit 101.

[0102] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 heater 207, H2 loop pipe 202, furnace body hydrogen spray gun 203, and blast furnace 201 via H2 pipeline 111.

[0103] The oxygen produced by the electrolytic hydrogen production unit 101 is pressurized by the buffer tank II 108 and the oxygen compressor 105, and then sent together with the mixed oxygen from the oxygen generator 223 to the air inlet of the blast furnace blower 210. The oxygen is enriched before the blower, and then heated to 1200°C by the hot blast stove 209 before being sent to the blast furnace blast pipe 204; or it is sent to the pipeline after the blast furnace blower 210, enriched with oxygen after the blower, and then heated to 1200°C by the hot blast stove 209 before being sent to the blast furnace blast pipe 204; and then distributed to the blast furnace tuyeres 221 through the blast furnace blast pipe 204 and blown into the blast furnace 201.

[0104] Power supply 102 supplies power to the electrolysis hydrogen production device 101.

[0105] The electrolytic hydrogen production unit 101 can produce both atmospheric and high-pressure gases.

[0106] Example 4 with appendix Figure 4 For reference, the following explanation is provided:

[0107] The hydrogen-rich blast furnace ironmaking device that realizes this technical solution is characterized by including an electrolytic hydrogen production device, a blast furnace system, and a waste heat boiler in a steel plant; the electrolytic hydrogen production device includes an SOEC solid oxide electrolytic cell.

[0108] The waste heat boiler 104 of the steel plant is connected to the feed pipe 112, and the feed pipe 112 is connected to the electrolytic hydrogen production device 101.

[0109] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 distributor 205, tuyer H2 spray gun 206, and blast furnace 201 via H2 pipeline 111.

[0110] The electrolytic hydrogen production unit 101 is connected in sequence to the buffer tank II 108, the oxygen compressor 105, the blast furnace blower 210, the hot blast stove 209, the air supply pipe 204, the blast furnace tuyeres 221, and the blast furnace 201; an oxygen generator 223 is also connected between the oxygen compressor 105 and the blast furnace blower 210.

[0111] Gas pipeline 213 is connected to hot air furnace 209 via gas pipeline II 212; gas pipeline 213 is connected to H2 heating furnace 207 via gas pipeline III 214.

[0112] The power supply 102 is connected to the electrolysis hydrogen production device 101.

[0113] Blast furnace 201 is connected in sequence to gas dust removal device 215, TRT device 216, gas pipeline I 211, and gas pipeline network 213 via gas pipeline 218.

[0114] The gas-water separator 110 is connected to the feed pipe 112.

[0115] The electricity comes from wind power, solar power, TRT, and waste heat power generation from steel plants.

[0116] The process of this invention is as follows:

[0117] Steam from the waste heat boiler 104 of the steel plant is supplied to the electrolytic hydrogen production unit 101 as raw material for the electrolytic hydrogen production unit 101.

[0118] The electrolytic hydrogen production unit 101 is connected in sequence to the gas-liquid separator 110, buffer tank I 107, H2 pressurizer 208, H2 heater 207, H2 loop pipe 202, furnace body hydrogen spray gun 203, and blast furnace 201 via H2 pipeline 111.

[0119] The oxygen produced by the electrolytic hydrogen production unit 101 is pressurized by the buffer tank II 108 and the oxygen compressor 105, and then sent together with the mixed oxygen from the oxygen generator 223 to the air inlet of the blast furnace blower 210. The oxygen is enriched before the blower, then heated by the hot blast stove 209, and then sent to the blast furnace blast pipe 204; or it is sent to the pipeline after the blast furnace blower 210, enriched after the blower, then heated by the hot blast stove 209, and then sent to the blast furnace blast pipe 204; and then distributed to the blast furnace tuyeres 221 through the blast furnace blast pipe 204 and blown into the blast furnace 201.

[0120] Power supply 102 supplies power to the electrolysis hydrogen production device 101.

[0121] The electrolytic hydrogen production unit 101 can produce both atmospheric and high-pressure gases.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A hydrogen-rich blast furnace ironmaking apparatus, characterized in that, This includes electrolytic hydrogen production units, blast furnace systems, and waste heat boilers in steel plants; the electrolytic hydrogen production units include SOEC solid oxide electrolyzers. The waste heat boiler (104) of the steel plant is connected to the feed pipe (112), and the feed pipe (112) is connected to the electrolytic hydrogen production device (101); The electrolytic hydrogen production device (101) is connected in sequence to a gas-water separator (110), a buffer tank I (107), an H2 pressurizer (208), and a blast furnace (201) via an H2 pipeline (111); The electrolytic hydrogen production device (101) is connected in sequence to the buffer tank II (108), oxygen compressor (105), air supply pipe (204), blast furnace tuyeres (221), and blast furnace (201) via an O2 pipeline (113); The power supply (102) is connected to the electrolysis hydrogen production device (101).

2. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The blast furnace (201) is connected in sequence to the gas dust removal device (215), the TRT device (216), the gas pipeline I (211), and the gas pipeline network (213) via the gas pipeline (218).

3. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The blast furnace (201) is connected in sequence to the gas dust removal device (215), the TRT device (216), the gas dehydration and desulfurization device (217), and the blast furnace gas CO2 removal device (219) via the gas pipeline (218).

4. A hydrogen-rich blast furnace ironmaking apparatus as described in claim 1 or 3, characterized in that, The CO2 removal device (219) for blast furnace gas is connected to the feed pipe (112) via the CO2 pipe (220).

5. A hydrogen-rich blast furnace ironmaking apparatus as described in claim 1 or 3, characterized in that, The enriched coal gas generated by the blast furnace gas CO2 removal device (219) is connected to the H2 pipeline (111) through the enriched coal gas pipeline (222).

6. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The H2 pressurizer (208) is connected in sequence to the H2 distributor (205), the tuyer H2 spray gun (206), and the blast furnace (201).

7. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The H2 pressurizer (208) is connected in sequence to the H2 heating furnace (207), the H2 ring pipe (202), the furnace body hydrogen spray gun (203), and the blast furnace (201).

8. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 7, characterized in that, The hydrogen spray gun (203) is installed at the lower part of the blast furnace (201) or at the waist of the furnace.

9. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The gas-water separator (110) is connected to the feed pipe (112).

10. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The oxygen compressor (105) and the air supply pipe (204) are also connected to a blast furnace blower (210) and a hot blast stove (209); the air supply pipe (204) is connected in sequence to the blast furnace tuyeres (221) and the blast furnace (201).

11. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, An oxygen generator (223) is also connected after the oxygen compressor (105).

12. The hydrogen-rich blast furnace ironmaking apparatus as described in claim 1, characterized in that, The electricity mentioned comes from wind power, photovoltaic power, TRT, and waste heat power generation from steel enterprises.

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