Organic liquid hydrogen storage and fuel cell integrated system and method for hydrogen energy steelmaking

Abstract

The invention belongs to the technical field of clean energy smelting, and particularly relates to an organic liquid hydrogen storage and fuel cell integrated system and method for hydrogen energy steelmaking. Comprising a solid oxide fuel cell module, an organic liquid hydrogen storage module and a hydrogen energy steelmaking module, high-temperature heat energy and electric energy generated by the solid oxide fuel cell module are transmitted to the hydrogen energy steelmaking module, and medium and low-temperature heat energy generated by the solid oxide fuel cell module is transmitted to the organic liquid hydrogen storage module; the organic liquid hydrogen storage module supplies hydrogen to the solid oxide fuel cell module and the hydrogen energy steelmaking module; a solid oxide fuel cell is adopted and is matched with organic liquid for hydrogen storage, so that efficient and stable hydrogen storage, heat supply and power supply integrated service is provided for hydrogen energy steelmaking; the organic liquid is used for storing hydrogen, so that a stable hydrogen storage service can be provided for hydrogen energy steelmaking, and a hydrogen storage service can also be provided for a solid oxide fuel cell.

Description

Technical Field

[0001] This invention belongs to the field of clean energy smelting technology, and specifically relates to a system and method for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking. Background Technology

[0002] The steel industry's energy consumption and carbon emissions continue to rise, creating immense pressure for energy conservation and emission reduction. Using green hydrogen produced from renewable energy sources such as wind and solar power in steelmaking has become the most direct, efficient, and fundamental means of emission reduction in the steel industry.

[0003] Compared to the exothermic reaction of carbon monoxide reducing iron in traditional steelmaking blast furnaces, the endothermic reaction of hydrogen reducing iron in hydrogen-powered gas-based vertical shaft furnaces requires a high-temperature external heat source to maintain the reaction. Furthermore, hydrogen reducing iron forms sponge iron, necessitating the use of an electric arc furnace for smelting, which also requires external electrical support. Solid oxide fuel cells (SOFCs), belonging to the third generation of fuel cells, are all-solid-state power generation devices that efficiently and cleanly convert the chemical energy stored in fuels (hydrogen, natural gas, etc.) and oxidants (oxygen, air, etc.) into electrical energy.

[0004] Meanwhile, hydrogen-powered steelmaking requires hydrogen storage to ensure a stable and continuous hydrogen supply and steel production. Existing technologies employ high-pressure hydrogen storage, liquid hydrogen storage, and methanol conversion for storage, all of which introduce additional energy consumption. Hydrogen-powered steelmaking also requires high-temperature external heat sources, and current technologies lack solutions. Using fossil fuels or hydrogen combustion for heating would lead to carbon emissions or low energy efficiency. Furthermore, the electric arc furnace in hydrogen-powered steelmaking requires stable external power. Using grid electricity or traditional energy sources introduces carbon emissions, contradicting the initial goal of carbon reduction. Directly using wind and solar power presents intermittent and fluctuating issues, similarly affecting stable and continuous steel production.

[0005] For example, patent number CN202210605578.4, entitled "A Renewable Energy Hydrogen Production and Storage Metallurgical System," discloses the use of a hydrogen liquefaction system to achieve hydrogen storage and supply for hydrogen-powered steelmaking, and the use of a liquid hydrogen-liquid nitrogen replacement system to achieve cold energy recovery and energy consumption reduction. However, it does not solve the problem of additional energy consumption for hydrogen storage. The solution also does not provide a detailed analysis of the heat, electricity, and hydrogen requirements of each process stage in hydrogen-powered steelmaking, and therefore fails to consider the high-temperature heat source required for gas-based vertical shaft furnaces and the clean and stable electricity required for electric arc furnaces.

[0006] Patent number CN202223007228.2, entitled "A Hydrogen Metallurgical Device Based on Methanol-to-Hydrogen Production," discloses a method of using a mixed gas generated from the conversion and reforming of methanol and water vapor as a reducing agent, which is then integrated with the hydrogen metallurgical process to ensure a stable supply of hydrogen reducing agent. The methanol-to-hydrogen production process also incorporates some waste heat recovery. However, the proposed solution lacks a detailed analysis of the heat, electricity, and hydrogen requirements of each process stage in hydrogen steelmaking, thus failing to consider the high-temperature heat source required for the gas-based vertical shaft furnace and the clean and stable electricity required for the electric arc furnace. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes an integrated organic liquid hydrogen storage and fuel cell system for hydrogen-powered steelmaking, comprising a solid oxide fuel cell module, an organic liquid hydrogen storage module, and a hydrogen-powered steelmaking module; the high-temperature thermal energy and electrical energy generated by the solid oxide fuel cell module are transferred to the hydrogen-powered steelmaking module, and the medium- and low-temperature thermal energy generated by the solid oxide fuel cell module is transferred to the organic liquid hydrogen storage module; the organic liquid hydrogen storage module supplies hydrogen to both the solid oxide fuel cell module and the hydrogen-powered steelmaking module.

[0008] Furthermore, the hydrogen-powered steelmaking module includes a gas-based vertical shaft furnace and an electric arc furnace; the output end of the gas-based vertical shaft furnace is connected to the input end of the electric arc furnace.

[0009] Furthermore, the solid oxide fuel cell module includes a fuel cell body, a burner, and a fuel cell heat exchanger; the high-temperature heat source output end and the electrical energy output end of the fuel cell body are connected to the hydrogen steelmaking module; the spent fuel output end of the fuel cell body is connected to the input end of the burner; the output end of the burner is connected to the input end of the fuel cell heat exchanger; and the medium- and low-temperature output end of the fuel cell heat exchanger is connected to the organic liquid hydrogen storage module.

[0010] Furthermore, the organic liquid hydrogen storage module includes an organic liquid storage tank, an organic hydrogen storage liquid storage tank, a hydrogenation reactor, and a dehydrogenation reactor; the output end of the organic liquid storage tank is connected to the input end of a first heat exchanger; the output end of the organic hydrogen storage liquid storage tank is connected to the input end of a second heat exchanger; the output end of the first heat exchanger is connected to the input end of the hydrogenation reactor; the output end of the second heat exchanger is connected to the input end of the dehydrogenation reactor; the gas input end of the hydrogenation reactor is used to transport hydrogen, and the liquid output end of the hydrogenation reactor is connected to the input end of the organic hydrogen storage liquid storage tank; the liquid output end of the dehydrogenation reactor is connected to the input end of the organic liquid storage tank, and the gas output end of the dehydrogenation reactor is connected to the gas input ends of the fuel cell body and the gas-based vertical shaft furnace.

[0011] Furthermore, the high-temperature heat source output end of the fuel cell body is connected to the input end of the gas-based vertical furnace; the power output end of the fuel cell body is connected to the power input end of the electric arc furnace.

[0012] Furthermore, the liquid output terminal of the fuel cell heat exchanger is connected to the input terminal of the first heat exchanger; the output terminal of the first heat exchanger is connected to the input terminal of the second heat exchanger, and the output terminal of the second heat exchanger is connected to the input terminal of the fuel cell heat exchanger.

[0013] A valve No. 1 is installed on the pipeline between the organic liquid storage tank and the No. 1 heat exchanger; a valve No. 2 is installed on the pipeline between the organic hydrogen storage tank and the No. 2 heat exchanger.

[0014] Furthermore, the hydrogen gas introduced into the inlet of the hydrogenation reactor is green hydrogen.

[0015] Furthermore, the heat exchange medium in the fuel cell heat exchanger is heat transfer oil.

[0016] This disclosure also proposes a method for integrating organic liquid hydrogen storage and fuel cells in hydrogen-powered steelmaking, applicable to any of the aforementioned systems integrating organic liquid hydrogen storage and fuel cells in hydrogen-powered steelmaking; the method includes the following steps:

[0017] Start the fuel cell body: Hydrogen and air are supplied to the fuel cell body from the outside. The fuel cell body works and produces electrical energy, high-temperature heat energy and spent fuel. The spent fuel is fed into the burner to burn and produce high-temperature exhaust gas. The high-temperature exhaust gas flows into the combustion cell heat exchanger for heat exchange.

[0018] Hydrogen storage: The heat exchange medium heated in the combustion battery heat exchanger is transported to the No. 1 heat exchanger, and the No. 1 valve is opened to transport the organic liquid in the organic liquid storage tank to the No. 1 heat exchanger; at the same time, hydrogen is introduced into the hydrogenation reactor, and the organic liquid heated after heat exchange is transported to the hydrogenation reactor to contact and react with the hydrogen to form organic hydrogen storage liquid, which is then transported to the organic hydrogen storage liquid storage tank.

[0019] Hydrogen supply: The heat exchange medium in the combustion battery heat exchanger is transported to the No. 2 heat exchanger. The No. 2 valve is opened to transport the organic hydrogen storage liquid to the No. 2 heat exchanger. The heated organic hydrogen storage liquid is then transported to the dehydrogenation reactor, and the generated hydrogen is transported to the fuel cell body and the gas-based vertical furnace.

[0020] Steelmaking: The hydrogen in the dehydrogenation reactor and the high-temperature heat energy generated by the fuel cell body are transported to the gas-based vertical shaft furnace; the iron ore in the gas-based vertical shaft furnace is converted into sponge iron and transported to the electric arc furnace. At the same time, the electrical energy generated by the fuel cell body is transported to the electric arc furnace to refine the sponge iron into crude steel.

[0021] Furthermore, during hydrogen storage, valve number one is opened and valve number two is closed. The heat exchange medium after heat exchange in heat exchanger number one flows into the fuel cell heat exchanger through heat exchanger number two. During hydrogen supply, valve number two is opened and valve number one is closed. The heat exchange medium in the fuel cell heat exchanger flows into heat exchanger number two after passing through heat exchanger number one.

[0022] This disclosure provides an efficient and stable integrated service of hydrogen storage, heating, and power supply for hydrogen-powered steelmaking by using a solid oxide fuel cell in conjunction with organic liquid hydrogen storage. The organic liquid hydrogen storage can provide stable hydrogen storage services for both hydrogen-powered steelmaking and solid oxide fuel cells. The heat source required for the dehydrogenation and hydrogenation processes of the organic liquid hydrogen storage can also be provided by the medium- and low-temperature waste heat from the solid oxide fuel cell, thus realizing a closed loop of hydrogen-electricity-heat in the system.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 An association diagram of the subsystems in an embodiment of the present invention is shown.

[0026] Figure 2 A system structure diagram of an embodiment of the present invention is shown.

[0027] Figure 3 A flowchart of a method according to an embodiment of the present invention is shown.

[0028] In the diagram, 10 is the solid oxide fuel cell module; 20 is the organic liquid hydrogen storage module; 30 is the hydrogen-powered steelmaking module; 301 is the gas-based vertical shaft furnace; 302 is the electric arc furnace; 101 is the fuel cell body; 102 is the burner; 103 is the fuel cell heat exchanger; 201 is the organic liquid storage tank; 202 is the organic hydrogen storage liquid storage tank; 203 is the hydrogenation reactor; 204 is the dehydrogenation reactor; 205 is the first heat exchanger; 206 is the second heat exchanger; 207 is the first valve; and 208 is the second valve. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This application provides a system integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking, with reference to... Figure 1 The system includes a solid oxide fuel cell module 10 (SOFC), an organic liquid hydrogen storage module 20, and a hydrogen-powered steelmaking module 30. The high-temperature thermal energy (600-1000℃) and electrical energy generated by the solid oxide fuel cell module 10 are transferred to the hydrogen-powered steelmaking module 30, and the medium- and low-temperature thermal energy (150-300℃) generated by the solid oxide fuel cell module 10 are transferred to the organic liquid hydrogen storage module 20. The organic liquid hydrogen storage module 20 supplies hydrogen to the solid oxide fuel cell module 10 and the hydrogen-powered steelmaking module 30.

[0031] refer to Figure 2 The aforementioned hydrogen-powered steelmaking module 30 includes a gas-based vertical shaft furnace 301 and an electric arc furnace 302; the output end of the gas-based vertical shaft furnace 301 is connected to the input end of the electric arc furnace 302.

[0032] The aforementioned solid oxide fuel cell module 10 includes a fuel cell body 101, a burner 102, and a fuel cell heat exchanger 103; the high-temperature heat source output end and the electrical energy output end of the aforementioned fuel cell body 101 are connected to the aforementioned hydrogen steelmaking module 30; the spent fuel output end of the aforementioned fuel cell body 101 is connected to the input end of the aforementioned burner 102; the output end of the aforementioned burner 102 is connected to the input end of the aforementioned fuel cell heat exchanger 103; and the medium- and low-temperature output end of the aforementioned fuel cell heat exchanger 103 is connected to the aforementioned organic liquid hydrogen storage module 20.

[0033] The aforementioned organic liquid hydrogen storage module 20 includes an organic liquid storage tank 201, an organic hydrogen storage liquid storage tank 202, a hydrogenation reactor 203, and a dehydrogenation reactor 204. The output end of the organic liquid storage tank 201 is connected to the input end of a first heat exchanger 205; the output end of the organic hydrogen storage liquid storage tank 202 is connected to the input end of a second heat exchanger 206; the output end of the first heat exchanger 205 is connected to the input end of the hydrogenation reactor 203; the output end of the second heat exchanger 206 is connected to the input end of the dehydrogenation reactor 204; the gas input end of the hydrogenation reactor 203 is used to transport hydrogen, and the liquid output end of the hydrogenation reactor 203 is connected to the input end of the organic hydrogen storage liquid storage tank 202; the liquid output end of the dehydrogenation reactor 204 is connected to the input end of the organic liquid storage tank 201, and the gas output end of the dehydrogenation reactor 204 is connected to the gas input ends of the fuel cell body 101 and the gas-based vertical furnace 301.

[0034] The high-temperature heat source output terminal of the aforementioned fuel cell body 101 is connected to the input terminal of the aforementioned gas-based vertical furnace 301; the power output terminal of the aforementioned fuel cell body 101 is connected to the power input terminal of the aforementioned electric arc furnace 302.

[0035] The liquid output end of the aforementioned fuel cell heat exchanger 103 is connected to the input end of the aforementioned first heat exchanger 205; the output end of the aforementioned first heat exchanger 205 is connected to the input end of the aforementioned second heat exchanger 206, and the output end of the aforementioned second heat exchanger 206 is connected to the input end of the aforementioned fuel cell heat exchanger 103.

[0036] A valve 207 is installed on the pipeline between the organic liquid storage tank 201 and the first heat exchanger 205; a valve 208 is installed on the pipeline between the organic hydrogen storage tank 202 and the second heat exchanger 206.

[0037] During implementation, hydrogen is first supplied to the outside of the fuel cell body 101, for example, by connecting a hydrogen cylinder, and then air is introduced; the internal reaction of the fuel cell body 101 converts chemical energy into electrical energy and heat energy; the spent fuel after the reaction flows into the burner 102. The spent fuel does not have the ability to generate electricity, but it still contains a small amount of unreacted hydrogen. The spent fuel enters the burner 102 for further combustion to generate high-temperature exhaust gas; the high-temperature exhaust gas is sent into the interior of the fuel cell heat exchanger 103, where it exchanges heat with the heat exchange medium inside the fuel cell heat exchanger 103; after the temperature of the heat exchange medium rises, it flows into the first heat exchanger 205, while the low-temperature exhaust gas is discharged from the outlet of the fuel cell heat exchanger 103;

[0038] Simultaneously, when hydrogen storage is required, clean hydrogen produced through wind and solar power, also known as green hydrogen, is introduced into the hydrogenation reactor 203. Valve 207 is opened and valve 208 is closed, allowing the organic liquid in the organic liquid storage tank 201 to be transported to the first heat exchanger 205. The organic liquid exchanges heat with the heated heat exchange medium inside the first heat exchanger 205. After heat exchange, the low-temperature heat exchange medium flows back into the fuel cell heat exchanger 103 through the second heat exchanger 206. When the temperature of the organic liquid reaches the temperature required for hydrogenation (150-250℃), the heated organic liquid is transported to the hydrogenation reactor 203 to contact and react with hydrogen, forming organic hydrogen storage liquid, which is then transported to the organic hydrogen storage liquid storage tank 202 for storage.

[0039] When hydrogen needs to be released, valve 208 opens and valve 207 closes. The organic hydrogen storage liquid enters heat exchanger 206 through valve 208. The high-temperature heat exchange medium in fuel cell heat exchanger 103 flows into heat exchanger 206 through heat exchanger 205, where it exchanges heat with the organic hydrogen storage liquid. After the heat exchange, the heat exchange medium flows back into fuel cell heat exchanger 103 through heat exchanger 206. When the temperature of the organic hydrogen storage liquid reaches the required dehydrogenation temperature (150-250℃), the heated organic hydrogen storage liquid is transported to dehydrogenation reactor 204. The generated hydrogen is then transported to the fuel cell body 101 and reacted in the gas-based vertical furnace 301. The resulting organic liquid is then transported back to the organic liquid storage tank 201. After the hydrogen generated by the dehydrogenation reactor 204 is transported to the fuel cell body 101, the external hydrogen initially supplied to the fuel cell body 101 for reaction can be removed, and the hydrogen in the dehydrogenation reactor 204 can be directly transported to the interior of the fuel cell body 101. Alternatively, a certain amount of hydrogen can be initially stored in the hydrogen cylinder, and after a period of reaction, the hydrogen in the dehydrogenation reactor 204 can be transported to the hydrogen cylinder to ensure a continuous supply of hydrogen to the fuel cell body 101.

[0040] After iron ore is pelletized, it is placed in a gas-based vertical shaft furnace 301. The high-temperature heat generated by the reaction in the fuel cell body 101 is supplied to the gas-based vertical shaft furnace 301, and the hydrogen generated in the dehydrogenation reactor 204 is also supplied to the gas-based vertical shaft furnace 301. In the gas-based vertical shaft furnace 301, the iron ore is converted into sponge iron. The sponge iron is then transported to an electric arc furnace 302. The electrical energy generated by the fuel cell body 101 is also supplied to the electric arc furnace 302. The sponge iron is melted and impurities are removed in the electric arc furnace 302, and further refined to form crude steel.

[0041] This disclosure provides an efficient and stable integrated service for hydrogen energy steelmaking by using a solid oxide fuel cell in conjunction with organic liquid hydrogen storage, which integrates hydrogen storage, heating, and power supply. The organic liquid hydrogen storage can provide stable hydrogen storage services for both hydrogen energy steelmaking and solid oxide fuel cells. The heat source required for the dehydrogenation and hydrogenation processes of the organic liquid hydrogen storage can also be provided by the medium- and low-temperature waste heat from the solid oxide fuel cell, realizing a closed loop of hydrogen-electricity-heat in the system. The heat source temperature is matched in stages, resulting in high energy utilization efficiency.

[0042] In one embodiment of the present invention, the hydrogen gas introduced into the inlet of the hydrogenation reactor 203 is green hydrogen.

[0043] In one embodiment of the present invention, the heat exchange medium in the fuel cell heat exchanger 103 is heat transfer oil.

[0044] During implementation, hydrogen produced using clean energy sources such as wind and solar power is applied to the steel industry to achieve low-carbon and green development of the steel industry; the heat transfer oil has the characteristics of low pressure and high temperature, stable heat release, good heat transfer effect, and sustainable recycling, and can be stably used in the fuel cell heat exchanger 103, the first heat exchanger 205 and the second heat exchanger 206 in this disclosure.

[0045] This disclosure presents a method for integrating organic liquid hydrogen storage and fuel cells in hydrogen-powered steelmaking. This method is applicable to any of the aforementioned systems integrating organic liquid hydrogen storage and fuel cells in hydrogen-powered steelmaking. The method includes the following steps:

[0046] Start the fuel cell body 101: Hydrogen and air are supplied to the fuel cell body 101 from the outside. The fuel cell body 101 works and generates electrical energy, high-temperature heat energy and spent fuel. The spent fuel is fed into the burner 102 and burned to generate high-temperature exhaust gas. The high-temperature exhaust gas flows into the combustion cell heat exchanger for heat exchange.

[0047] Hydrogen storage: The heat exchange medium heated in the combustion battery heat exchanger is transported to the No. 1 heat exchanger 205. The No. 1 valve 207 is opened to transport the organic liquid in the organic liquid storage tank 201 to the No. 1 heat exchanger 205. At the same time, hydrogen is introduced into the hydrogenation reactor 203, and the heated organic liquid after heat exchange is transported to the hydrogenation reactor 203 to contact and react with the hydrogen, forming organic hydrogen storage liquid, which is then transported to the organic hydrogen storage liquid storage tank 202.

[0048] Hydrogen supply: The heat exchange medium in the combustion battery heat exchanger is transported to the second heat exchanger 206. The second valve 208 is opened to transport the organic hydrogen storage liquid to the second heat exchanger 206. The heated organic hydrogen storage liquid is then transported to the dehydrogenation reactor 204, and the generated hydrogen is transported to the fuel cell body 101 and the gas-based vertical furnace 301.

[0049] Steelmaking: The hydrogen in the dehydrogenation reactor 204 and the high-temperature heat energy generated by the fuel cell body 101 are transported to the gas-based vertical shaft furnace 301; the iron ore in the gas-based vertical shaft furnace 301 is converted into sponge iron and transported to the electric arc furnace 302. At the same time, the electrical energy generated by the fuel cell body 101 is transported to the electric arc furnace 302 to refine the sponge iron into crude steel.

[0050] During hydrogen storage, valve 207 is open and valve 208 is closed. The heat exchange medium after heat exchange in heat exchanger 205 flows into the fuel cell heat exchanger 103 through heat exchanger 206. During hydrogen supply, valve 208 is open and valve 207 is closed. The heat exchange medium in fuel cell heat exchanger 103 flows into heat exchanger 206 after passing through heat exchanger 205 for heat exchange.

[0051] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking, characterized in that, It includes a solid oxide fuel cell module (10), an organic liquid hydrogen storage module (20), and a hydrogen-powered steelmaking module (30); the high-temperature heat energy and electrical energy generated by the solid oxide fuel cell module (10) are transferred to the hydrogen-powered steelmaking module (30), and the medium- and low-temperature heat energy generated by the solid oxide fuel cell module (10) is transferred to the organic liquid hydrogen storage module (20); the organic liquid hydrogen storage module (20) supplies hydrogen to the solid oxide fuel cell module (10) and the hydrogen-powered steelmaking module (30).

2. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 1, characterized in that, The hydrogen-powered steelmaking module (30) includes a gas-based vertical shaft furnace (301) and an electric arc furnace (302); the output end of the gas-based vertical shaft furnace (301) is connected to the input end of the electric arc furnace (302).

3. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 2, characterized in that, The solid oxide fuel cell module (10) includes a fuel cell body (101), a burner (102), and a fuel cell heat exchanger (103); the high-temperature heat source output end and the electrical energy output end of the fuel cell body (101) are connected to the hydrogen steelmaking module (30); the spent fuel output end of the fuel cell body (101) is connected to the input end of the burner (102); the output end of the burner (102) is connected to the input end of the fuel cell heat exchanger (103); and the medium-low temperature output end of the fuel cell heat exchanger (103) is connected to the organic liquid hydrogen storage module (20).

4. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 3, characterized in that, The organic liquid hydrogen storage module (20) includes an organic liquid storage tank (201), an organic hydrogen storage liquid storage tank (202), a hydrogenation reactor (203), and a dehydrogenation reactor (204); the output end of the organic liquid storage tank (201) is connected to the input end of the first heat exchanger (205); the output end of the organic hydrogen storage liquid storage tank (202) is connected to the input end of the second heat exchanger (206); the output end of the first heat exchanger (205) is connected to the input end of the hydrogenation reactor (203); the output end of the second heat exchanger (206) is connected to the input end of the second heat exchanger (204). The output end of the hydrogenation reactor (203) is connected to the input end of the dehydrogenation reactor (204); the gas input end of the hydrogenation reactor (203) is used to transport hydrogen, and the liquid output end of the hydrogenation reactor (203) is connected to the input end of the organic hydrogen storage liquid tank (202); the liquid output end of the dehydrogenation reactor (204) is connected to the input end of the organic liquid tank (201), and the gas output end of the dehydrogenation reactor (204) is connected to the gas input ends of the fuel cell body (101) and the gas-based vertical furnace (301).

5. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 4, characterized in that, The high-temperature heat source output end of the fuel cell body (101) is connected to the input end of the gas-based vertical furnace (301); the power output end of the fuel cell body (101) is connected to the power input end of the electric arc furnace (302).

6. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 5, characterized in that, The liquid output end of the fuel cell heat exchanger (103) is connected to the input end of the first heat exchanger (205); the output end of the first heat exchanger (205) is connected to the input end of the second heat exchanger (206), and the output end of the second heat exchanger (206) is connected to the input end of the fuel cell heat exchanger (103). A valve (207) is installed on the pipeline between the organic liquid storage tank (201) and the first heat exchanger (205); a valve (208) is installed on the pipeline between the organic hydrogen storage tank (202) and the second heat exchanger (206).

7. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 6, characterized in that, The hydrogen gas introduced into the inlet of the hydrogenation reactor (203) is green hydrogen.

8. The system for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 7, characterized in that, The heat exchange medium in the fuel cell heat exchanger (103) is heat transfer oil.

9. A method for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking, characterized in that, This method is applicable to any of the organic liquid hydrogen storage and fuel cell integrated systems for hydrogen-powered steelmaking as described in claims 1-8; the method includes the following steps: Start the fuel cell body (101): Hydrogen and air are supplied to the fuel cell body (101) from the outside. The fuel cell body (101) works and generates electrical energy, high-temperature heat energy and spent fuel. The spent fuel is fed into the burner (102) to burn and generate high-temperature exhaust gas. The high-temperature exhaust gas flows into the combustion cell heat exchanger for heat exchange. Hydrogen storage: The heat exchange medium heated in the combustion battery heat exchanger is transported to the No. 1 heat exchanger (205), and the No. 1 valve (207) is opened to transport the organic liquid in the organic liquid storage tank (201) to the No. 1 heat exchanger (205); at the same time, hydrogen is introduced into the hydrogenation reactor (203), and the heated organic liquid after heat exchange is transported to the hydrogenation reactor (203) to contact and react with the hydrogen, forming organic hydrogen storage liquid, which is then transported to the organic hydrogen storage liquid storage tank (202); Hydrogen supply: The heat exchange medium in the combustion battery heat exchanger is transported to the second heat exchanger (206), and the second valve (208) is opened to transport the organic hydrogen storage liquid to the second heat exchanger (206); then the heated organic hydrogen storage liquid is transported to the dehydrogenation reactor (204), and the generated hydrogen is transported to the fuel cell body (101) and the gas-based vertical furnace (301); Steelmaking: Hydrogen in the dehydrogenation reactor (204) and the high-temperature heat energy generated by the fuel cell body (101) are transported to the gas-based shaft furnace (301); the iron ore in the gas-based shaft furnace (301) is converted into sponge iron and transported to the electric arc furnace (302), while the electrical energy generated by the fuel cell body (101) is transported to the electric arc furnace (302) to refine the sponge iron into crude steel.

10. A method for integrating organic liquid hydrogen storage and fuel cells for hydrogen-powered steelmaking according to claim 9, characterized in that, During hydrogen storage, valve 1 (207) is opened and valve 2 (208) is closed. The heat exchange medium after heat exchange in heat exchanger 1 (205) flows into the fuel cell heat exchanger (103) through heat exchanger 2 (206). During hydrogen supply, valve 2 (208) is opened and valve 1 (207) is closed. The heat exchange medium in fuel cell heat exchanger (103) flows into heat exchanger 2 (206) after passing through heat exchanger 1 (205).

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