A power generation and hydrogen production system coupled with RSOC and blast furnace gas CCPP

Abstract

The present invention belongs to the field of comprehensive energy utilization technology in the steel industry, specifically relating to a power generation and hydrogen production system that couples a solid-state oxygen (SOFC) stack with a blast furnace gas (CCPP) system. The system comprises a steel mill blast furnace and a CCPP system connected to the blast furnace. The CCPP system comprises an air compressor, a combustion chamber, a gas turbine, a waste heat boiler, a steam turbine, and a second generator, all connected in sequence. The system also includes a solid-state oxygen (SOFC) stack and a gas compressor. The anode inlet of the RSOC stack is connected to the first blast furnace gas outlet of the blast furnace, and the cathode inlet is connected to the air compressor. One end of the gas compressor is connected to the second blast furnace gas outlet of the blast furnace, and the other end is connected to the combustion chamber and the anode inlet, respectively. The anode outlet of the RSOC stack is connected to the inlet of the gas turbine via an exhaust gas pipeline. This invention deeply couples a blast furnace gas-fueled SOFC with CCPP technology, enabling both green power generation and efficient hydrogen production, and has great potential for application in steel enterprises' self-owned power plants.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive energy utilization in the steel industry, and particularly relates to a power generation and hydrogen production system coupling RSOC with blast furnace gas CCPP. Background Art

[0002] The steel industry is one of the main areas of carbon emissions in my country. Promoting the green and low-carbon development of steel companies is crucial for achieving the goals of "carbon peak and carbon neutrality" as soon as possible. Three main types of gas are produced during steelmaking in steel mills: coke oven gas, converter gas, and blast furnace gas. Coke oven gas (mainly composed of H2 and CH4) is the most valuable and scarce resource for steel mills. It has the highest calorific value and is mainly used for smelting production fuel and hydrogen production; converter gas (mainly composed of CO, CO2, N2, H2) has the second highest calorific value and is mainly used as fuel and for power generation; blast furnace gas (mainly composed of N2, CO, CO2) is a by-product of blast furnace ironmaking and the main source of gas for steel mills, but it has the lowest calorific value. How to achieve high added value in the use of blast furnace gas is an important direction for achieving emission reduction and efficiency improvement in steel mills. Currently, the main way to use blast furnace gas is to be used by self-owned power plants to generate electricity, thereby increasing the self-generated power rate of steel mills.

[0003] Gas boiler units and gas-steam combined cycle units (CCPP) are currently the two main gas-fired power generation technologies used in steel companies' self-owned power plants. CCPP units have a series of advantages, including high efficiency, small footprint, low water consumption, fast start and stop, and flexible regulation, and are widely used in my country's steel plant power generation systems. However, CCPP also has drawbacks, such as large unit investment, frequent shutdowns and overhauls, and high maintenance costs. In addition, due to the high combustion temperature, CCPP units inevitably produce a certain amount of NO. x In addition, there are small amounts of harmful components such as CO and SO2, which often require expensive environmental treatment equipment to meet emission standards.

[0004] Solid oxide fuel cells (SOFCs) are advanced, all-solid-state, high-temperature fuel cells with high power generation efficiency, strong fuel adaptability, and suitability for combined heat and power generation. They are recognized as a 21st-century green energy technology with great application prospects in stationary power generation. Compared to CCPPs, SOFCs offer more efficient, green, clean, and quiet power generation. Technologies for combining SOFC and coke oven gas (COG) for power generation have been proposed. For example, patent CN216481179U discloses a combined COG-SOFC power and heating system. However, COG is a precious gas resource in steel mills and its availability is extremely limited. COG-SOFC power generation is not only wasteful but also has low power generation capacity, making its use impractical. Furthermore, COG primarily consists of H₂ and CH₄. When using CH₄ as a fuel cell stack, the CH₄ must first undergo steam reforming to produce CO and H₂, which increases the stack's complexity.

[0005] Blast furnace gas is an ideal fuel for power stacks, but there is currently no precedent in the domestic or international steel industry for integrating and implementing a BFG-fueled SOFC with a CCPP system. Furthermore, SOFC power generation alone cannot be deeply integrated with a CCPP system. Therefore, efficiently integrating BFG into steel companies' self-owned power plants remains an unresolved issue. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a power generation and hydrogen production system coupling RSOC and blast furnace gas CCPP.

[0007] The present invention adopts the following technical solutions:

[0008] A power generation and hydrogen production system coupled with an RSOC and a blast furnace gas CCPP system, comprising a CCPP system, an RSOC stack, and a gas compressor. The CCPP system comprises an air compressor, a combustion chamber, a gas turbine, a waste heat boiler, a steam turbine, and a second generator connected in sequence. The anode inlet of the RSOC stack is connected to the first blast furnace gas outlet of the blast furnace, the cathode inlet of the RSOC stack is connected to the air compressor, one end of the gas compressor is connected to the second blast furnace gas outlet of the blast furnace, and the other end is connected to the combustion chamber and the anode inlet of the RSOC stack via gas pipelines. The anode outlet of the RSOC stack is connected to the inlet of the gas turbine via an exhaust gas pipeline.

[0009] Preferably, a gas preheater is provided at the anode inlet of the RSOC stack, and an air preheater is provided at the cathode inlet of the RSOC. The blast furnace gas and air entering the RSOC are preheated to the target temperature by the gas preheater or the air preheater before entering the RSOC stack.

[0010] Preferably, the power generation and hydrogen production system also includes a hydrogen storage system, which includes a hydrogen cooler, a gas-water separator, a hydrogen booster and a hydrogen storage tank, which are connected to the anode inlet of the RSOC stack in sequence. At the same time, between the waste heat boiler and the steam turbine, the outlet of the waste heat boiler is also connected to the anode outlet of the RSOC stack through a steam pipeline.

[0011] Preferably, the gas turbine is also connected to a first generator, and the output end of the second generator is also connected to the RSOC stack.

[0012] Preferably, the air inlet end pipeline of the air compressor is further provided with an auxiliary pipeline directly connected to the air preheater, and an air blower and a pneumatic control valve are provided on the auxiliary pipeline to control the amount of air entering.

[0013] Preferably, a gas blower is further provided between the first blast furnace gas outlet and the gas preheater.

[0014] Preferably, each pipeline of the CCPP system connected to the RSOC stack, the connecting pipeline between the air compressor and the combustion chamber, and the pipeline between the blast furnace and the RSOC stack are provided with a pneumatic switch control valve for controlling the opening and closing of the pipeline and regulating the flow.

[0015] Preferably, the system is divided into the following three working modes according to the reaction form of the RSOC stack:

[0016] 1) RSOC stack power generation: The CCPP system is deactivated, and the air blower blows air into the air preheater for heating before inputting it into the RSOC stack cathode. Blast furnace gas from the first blast furnace gas outlet enters the gas preheater through the gas blower for heating before inputting it into the RSOC stack anode. The RSOC stack operates at normal pressure to generate electricity.

[0017] 2) The RSOC stack and CCPP system jointly generate electricity: the pneumatic switch control valve between the air compressor and the combustion chamber is closed, the burner does not work, and blast furnace gas enters the gas compressor from the second blast furnace gas outlet for compression, is heated by the gas preheater, and then is input into the RSOC stack anode. Air is compressed by the air compressor, heated by the air preheater, and then input into the RSOC stack cathode. The RSOC stack reacts to generate electricity. At the same time, the exhaust gas at the RSOC stack anode outlet enters the gas turbine through the exhaust pipeline, driving the gas turbine to generate work and generate electricity by the first generator.

[0018] Or the pneumatic switch control valve between the air compressor and the combustion chamber is opened, and part of the air and blast furnace gas enter the RSOC stack to react and generate electricity, and the other part enters the combustion chamber together for combustion. The combustion exhaust gas and the exhaust gas from the RSOC stack anode outlet then enter the gas turbine together to drive the gas turbine to generate electricity by the first generator. At the same time, the exhaust gas from the gas turbine enters the waste heat boiler, and finally drives the second generator to generate electricity;

[0019] 3) Hydrogen production by coupling the RSOC stack with the CCPP system: Part of the water vapor generated by the waste heat boiler in the CCPP system enters the anode of the RSOC stack through the water vapor pipeline, and the other part enters the steam turbine. The steam turbine generates work to drive the second generator to generate electricity. The electricity enters the RSOC stack to promote electrolysis reaction inside the RSOC stack, generating high-temperature hydrogen. The hydrogen enters the hydrogen storage system from the anode inlet of the RSOC stack, and is stored in the hydrogen storage tank after cooling, gas-water separation and compression.

[0020] Preferably, the gas preheater is also connected to the RSOC anode outlet and uses the tail gas at the anode outlet to heat the blast furnace gas, and the air preheater is also connected to the cathode outlet of the RSOC stack and uses the high-temperature air at the cathode outlet to heat the air;

[0021] Preferably, the air preheater heats the air to 650-1000°C, the gas preheater heats the gas to 600-1000°C, and the temperature of the heated air differs from the blast furnace gas temperature by less than or equal to 50°C.

[0022] Preferably, during the hydrogen production process of the RSOC stack coupled with the CCPP system, the produced hydrogen can also be returned to the blast furnace for blast furnace ironmaking.

[0023] The beneficial effects of the present invention are:

[0024] 1. Reversible solid oxide cell RSOC is a solid-state electrochemical device that can be operated alternately as a solid oxide fuel cell (SOFC) and a solid oxide electrolysis cell (SOEC). The present invention utilizes the characteristics of RSOC. On the one hand, it is used as a SOFC. It uses blast furnace gas as fuel and undergoes an electrochemical reaction with the oxidant air to completely convert CO into CO2, while generating electricity and heat. Due to the high temperature of the exhaust gas from the SOFC, it can also be combined with the CCPP unit to form a combined cycle power generation system, thereby further improving the power generation capacity and power generation efficiency. On the other hand, it can be used as a SOEC for electric hydrogen production. SOEC has the highest electrolysis efficiency in electric hydrogen production technology. In addition, the operating temperatures of SOEC and CCPP units are also relatively similar. The surplus electricity and water vapor of the self-contained power plant can be converted into hydrogen and oxygen by introducing them into the SOEC, thereby realizing on-site hydrogen production in the power plant.

[0025] The present invention deeply couples SOFC fueled by blast furnace gas with CCPP technology, which can generate electricity in a green way and produce hydrogen efficiently, and has great application prospects in the self-owned power plants of steel enterprises.

[0026] 2. SOFC can use the surplus blast furnace gas of steel mills as fuel to independently form a power generation system, achieving efficient, clean and silent power generation. It can be used as an emergency backup power supply and peak load unit when the CCPP unit is shut down for maintenance, and it can completely eliminate NO x and CO. In addition, since blast furnace gas does not contain CH4, the fuel cell does not need a reforming module, making the system simple and easy to implement.

[0027] 3. Due to the close operating temperature ranges of SOFC and CCPP units, this invention realizes the organic combination of new electrochemical power generation and traditional Brayton cycle power generation, which is a perfect application scenario for steel enterprises' self-owned power plants. In the RSOC stack and CCPP system combined power generation mode, the two are combined with the old and the new, and the dynamic and static are combined. The air compressor and gas compressor are used to extract part of the air and blast furnace gas respectively, which reduces the accident rate of compressor surge. At the same time, the utilization efficiency of blast furnace gas will be further improved, the overall power generation efficiency will be improved, and NO emissions will be further reduced. x and emissions of harmful gases such as CO.

[0028] 4. During periods of low electricity demand, this invention utilizes the RSOC stack coupled with the CCPP system to produce hydrogen. Excess electricity and superheated steam from the waste heat boiler are directly fed to the stack, where they undergo electrolysis, converting hydrogen and oxygen into hydrogen and oxygen, which are then stored. This enables on-site hydrogen production at the power plant, and both hydrogen and oxygen can be used as smelting fuel in the steel mill. When the produced hydrogen replaces part of the coke as a reducing agent in blast furnace ironmaking, this truly achieves "hydrogen metallurgy," significantly reducing CO2 emissions from the ironmaking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a power generation and hydrogen production system coupling RSOC with blast furnace gas CCPP according to the present invention;

[0030] Figure 2 This is a working diagram of the system mode 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the working mode 2 of the system of the present invention;

[0032] Figure 4 This is a schematic diagram of the working mode three of the system of the present invention.

[0033] The meanings of the symbols in the figure are as follows:

[0034] 10- blast furnace 11- blast furnace gas first outlet 12- blast furnace gas second outlet

[0035] 21- Air compressor 22- Combustion chamber 23- Gas turbine 24- Waste heat boiler 241- Steam pipeline 25- Steam turbine 26- Second generator 27- First generator

[0036] 30-RSOC stack 30a-anode inlet 30b-cathode inlet 30c-anode outlet 30d-cathode outlet 31-exhaust pipe

[0037] 40-Gas compressor

[0038] 51-Gas preheater 52-Air preheater

[0039] 61-Hydrogen cooler 62-Gas-water separator 63-Hydrogen booster 64-Hydrogen storage tank

[0040] 70-Auxiliary pipeline 71-Air blower 72-Pneumatic control valve 73-Gas blower DETAILED DESCRIPTION

[0041] The technical solution of the present invention is described in more detail below with reference to the accompanying drawings:

[0042] A power generation and hydrogen production system coupling RSOC and blast furnace gas CCPP includes a steel plant blast furnace 10, a CCPP system connected to the blast furnace 10, an RSOC stack 30, a gas compressor 40, and a hydrogen storage system.

[0043] The cathode and anode of the RSOC stack 30 are both provided with inlet and outlet pipes. In the present invention, the RSOC stack 30 has two reversibly switchable modes of power generation and hydrogen production. For the convenience of explanation, this specification uses the working conditions of the pipe ports of the RSOC stack 30 in the power generation mode, and defines the pipe port for air entry at the cathode as the cathode inlet 30b, the pipe port for high-temperature air discharge as the cathode outlet 30d, the pipe port for gas entry at the anode as the anode inlet 30a, and the pipe port for high-temperature exhaust gas discharge as the anode outlet 30b. The names used for the various pipe ports of the RSOC stack 30 in the hydrogen production mode are consistent with those in the power generation mode.

[0044] The CCPP system includes an air compressor 21, a combustion chamber 22, a gas turbine 23, a waste heat boiler 24, a steam turbine 25 and a second generator 26 connected in sequence, and the hydrogen storage system includes a hydrogen cooler 61, a gas-water separator 62, a hydrogen booster 63 and a hydrogen storage tank 64 connected in sequence to the anode inlet 30a of the RSOC stack 30.

[0045] The anode inlet 30a of the RSOC stack 30 is connected to the first blast furnace gas outlet 11 of the blast furnace 10, the cathode inlet 30b of the RSOC stack 30 is connected to the air compressor 21, one end of the gas compressor 40 is connected to the second blast furnace gas outlet 12 of the blast furnace 10, and the other end is connected to the combustion chamber 22 and the anode inlet 30a of the RSOC stack 30 through gas pipelines, the anode outlet 30c of the RSOC stack 30 is connected to the inlet end of the gas turbine 23 through an exhaust pipeline 31, and between the waste heat boiler 24 and the steam turbine 25, the outlet of the waste heat boiler 24 is also connected to the anode outlet 30c of the RSOC stack 30 through a steam pipeline 241.

[0046] A gas preheater 51 is provided at the anode inlet 30a of the RSOC stack 30, and an air preheater 52 is provided at the cathode inlet 30b of the RSOC stack 30. The blast furnace gas and air entering the RSOC stack 30 are preheated to the target temperature by the gas preheater 51 or the air preheater 52 before entering the RSOC stack 30.

[0047] The gas turbine 23 is further connected to a first generator 27 , and an output end of the second generator 26 is further connected to the RSOC stack 30 .

[0048] The air inlet end pipeline of the air compressor 21 is further provided with an auxiliary pipeline 70 directly connected to the air preheater 52 , and the auxiliary pipeline 70 is provided with an air blower 71 and a pneumatic control valve 72 to control the amount of air entering.

[0049] Pneumatic switch control valves are provided on each pipeline of the CCPP system connected to the RSOC stack 30, the pipeline connecting the air compressor 21 and the combustion chamber 22, and the pipeline connecting the blast furnace 10 and the RSOC stack 30 to control the opening and closing of the pipeline and flow regulation.

[0050] The present invention provides a power generation and hydrogen production system that couples RSOC with blast furnace gas CCPP. The system can be divided into the following three operating modes according to the reaction form of the RSOC stack and the operation of the CCPP system:

[0051] Mode 1: RSOC stack power generation

[0052] When the CCPP system is shut down due to maintenance or other reasons, the air compressor 21 and the gas compressor 40 will stop working. At this time, the reversible solid oxide cell RSOC of the system will operate in the solid oxide fuel cell SOFC mode, which can work independently to generate electricity and be connected to the grid. The SOFC can adopt the mainstream anode-supported flat-plate stack.

[0053] In this mode, the air blower 71 draws in ambient air at room temperature and sends it to the air preheater 52 through the pneumatic control valve 72, where it is heated to above 650°C by the high-temperature air at the cathode outlet 30d of the RSOC stack 30, and then sent to the cathode inlet 30b of the stack; blast furnace gas enters the gas preheater 51 from the first blast furnace gas outlet 11 through the gas blower 73 and the pneumatic switch control valve, is heated to above 600°C by the high-temperature exhaust gas at the anode outlet 30c of the stack, and is input into the anode of the RSOC stack 30. The RSOC stack 30 operates at normal pressure to generate electricity.

[0054] In this mode, the RSOC stack operates at atmospheric pressure, with the anode and cathode inlet gas pressures of approximately 1-2 bar. Based on current technology, connecting multiple SOFC stacks in parallel can achieve megawatt-level power generation.

[0055] Mode 2: RSOC stack and CCPP system combined power generation

[0056] When SOFC and CCPP systems are used to generate electricity together, SOFC can use a typical anode-supported tube-type stack.

[0057] This mode can be divided into the following two cases according to the operation of the CCPP system:

[0058] 1) The final outlet valves of the CCPP system air compressor 21 and gas compressor 40 are closed (or the pneumatic switch control valve between the air compressor 21 and the combustion chamber 22 is closed, and the pneumatic switch control valve between the gas compressor 40 and the combustion chamber 22 is also closed), and the combustion chamber 22 does not work.

[0059] The air compressor 21 and the gas compressor 40 extract all the air and blast furnace gas through the exhaust ports of any of the subsequent stages. At this point, the air and blast furnace gas are at temperatures above 300°C and pressures around 1 MPa. The air is then heated by the air preheater 52 and fed into the cathode of the RSOC stack 30. The blast furnace gas is heated by the gas preheater 51 and fed into the anode of the RSOC stack 30. The RSOC stack 30 reacts to generate electricity. Simultaneously, exhaust gas from the RSOC stack anode outlet 30c enters the inlet (first-stage stators) of the gas turbine 23 via the exhaust gas line 31, driving the gas turbine 23 to generate power and drive the first generator 27 to generate electricity. Simultaneously, the exhaust gas from the gas turbine can enter the waste heat boiler 24 and subsequent equipment to drive the second generator 26 to generate electricity. The exhaust gas primarily consists of N2 and CO2, with temperatures above 1000°C and pressures around 1 MPa.

[0060] This working mode completely eliminates NO x and CO, and compared with the SOFC independent power generation system, the exhaust gas of the fuel cell stack can be fully utilized, and the comprehensive power generation efficiency and power generation capacity are greatly improved.

[0061] 2) The final outlet valves of the CCPP system's air compressor 21 and gas compressor 40 are opened (or the pneumatic on / off control valve between the air compressor 21 and the combustion chamber 22 is opened, and the pneumatic on / off control valve between the gas compressor 40 and the combustion chamber 22 is also opened). The air compressor 21 and gas compressor 40 extract a portion of air and blast furnace gas through the exhaust port of any of the subsequent stages. At this point, the air and blast furnace gas are approximately above 300°C and at a pressure of approximately 1 MPa. These air and blast furnace gas are then preheated to appropriate temperatures in the air preheater 52 and gas preheater 51, respectively, before entering the fuel cell stack to react and generate electricity. The remaining air and blast furnace gas are then sent to the combustion chamber 22 for mixing and combustion. Simultaneously, the exhaust gas from the RSOC stack's anode outlet 30c mixes with the flue gas from the combustion chamber 22 and, together, generates power for the gas turbine 23, driving the first generator 27. This exhaust gas, primarily composed of N2 and CO2, has a temperature above 1000°C and a pressure of approximately 1 MPa. The main components of flue gas are N2, CO2 and H2O, the temperature is above 1200℃ and the pressure is about 1MPa.

[0062] Compared with the blast furnace gas CCPP independent power generation system, this model can effectively reduce the accident rate of air compressor surge, and further improve the overall power generation efficiency while meeting the high power generation requirements. Finally, it will further reduce NO x and emissions of harmful gases such as CO.

[0063] In particular, in this second mode, part of the tail gas at the RSOC stack anode outlet 30c can enter the gas preheater 51 for preheating the coal gas, and part can be discharged to the inlet of the gas turbine 23.

[0064] Mode 3: RSOC stack coupled with CCPP system for hydrogen production

[0065] During the period of low electricity consumption, the reversible solid oxide cell RSOC operates in the solid oxide electrolysis cell SOEC mode, and the SOEC is coupled with the CCPP system to produce hydrogen.

[0066] In this mode, the CCPP unit combustion chamber 22 operates normally, and the exhaust gas from the gas turbine 23 enters the waste heat boiler 24. The superheated steam generated by the waste heat boiler 24 has a temperature of 500-600°C and a pressure of approximately 6 MPa. The superheated steam enters the anode of the RSOC stack 30 through the steam pipe 241. The pneumatic switch control valve provided on the steam pipe 241 regulates the flow rate while also reducing the steam pressure. Another portion of the superheated steam enters the steam turbine 25. The steam turbine 25 generates work to drive the second generator 26 to generate electricity. The surplus electricity generated is passed into the RSOC stack 30 to promote electrolysis reaction within the RSOC stack 30, generating high-temperature hydrogen that enters the hydrogen storage system through the anode inlet 30a of the RSOC stack 30. In the hydrogen storage system, the hydrogen is first cooled by heat exchange with chilled water in the hydrogen cooler 61. After cooling to room temperature, it enters the gas-water separator 62 for dehydration, is then compressed by the hydrogen compressor 63, and is finally stored in the hydrogen storage tank 64.

[0067] In this system, the hydrogen stored in the hydrogen storage tank 64 can also be returned to the blast furnace 10 for blast furnace ironmaking. Hydrogen replaces part of the coke as a reducing agent, which can greatly reduce the CO2 emissions of the ironmaking process. In addition, the oxygen produced by the electrolysis reaction can also be stored and used as smelting fuel in the steel plant.

[0068] It should be understood that the RSOC stack in this specification is reversibly switchable between power generation and hydrogen production modes. The stack's anode, cathode, electrolyte, and catalyst materials are the same in different modes, but power generation and hydrogen production cannot operate simultaneously. The anode outlet 30c of the RSOC stack in power generation mode also serves as the water vapor inlet for the water vapor pipeline 241 in hydrogen production mode; the anode inlet 30a in power generation mode also serves as the hydrogen outlet in hydrogen production mode. Persons skilled in the art can configure these settings based on specific circumstances.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power generation and hydrogen production system coupling RSOC with blast furnace gas CCPP, characterized in that: The power generation and hydrogen production system comprises a CCPP system, an RSOC stack (30) and a gas compressor (40), wherein the CCPP system comprises an air compressor (21), a combustion chamber (22), a gas turbine (23), a waste heat boiler (24), a steam turbine (25) and a second generator (26) connected in sequence, wherein the anode inlet (30a) of the RSOC stack (30) is connected to the first blast furnace gas outlet (11) of the steel plant blast furnace (10), the cathode inlet (30b) of the RSOC stack (30) is connected to the air compressor (21), one end of the gas compressor (40) is connected to the second blast furnace gas outlet (12) of the blast furnace (10), and the other end is connected to the combustion chamber (22) and the anode inlet (30a) of the RSOC stack (30) through a gas pipeline, and the anode outlet (30c) of the RSOC stack (30) is connected to the inlet end of the gas turbine (23) through an exhaust gas pipeline (31); The power generation and hydrogen production system also includes a hydrogen storage system, which includes a hydrogen cooler (61), a gas-water separator (62), a hydrogen booster (63) and a hydrogen storage tank (64) connected in sequence to the anode inlet (30a) of the RSOC stack (30); at the same time, between the waste heat boiler (24) and the steam turbine (25), the outlet of the waste heat boiler (24) is also connected to the anode outlet (30c) of the RSOC stack (30) through a steam pipeline (241).

2. The power generation and hydrogen production system coupling RSOC and blast furnace gas CCPP according to claim 1, characterized in that: A gas preheater (51) is provided at the anode inlet (30a) of the RSOC stack (30), and an air preheater (52) is provided at the cathode inlet (30b) of the RSOC stack (30). The blast furnace gas and air entering the RSOC stack (30) are preheated to a target temperature by the gas preheater (51) or the air preheater (52) before entering the RSOC stack (30).

3. The power generation and hydrogen production system coupling RSOC with blast furnace gas CCPP according to claim 2, characterized in that: The gas turbine (23) is also connected to a first generator (27), and the output end of the second generator (26) is also connected to the RSOC stack (30).

4. The power generation and hydrogen production system coupling RSOC and blast furnace gas CCPP according to claim 1, characterized in that: The air intake end pipeline of the air compressor (21) is further provided with an auxiliary pipeline (70) directly connected to the air preheater (52), and the auxiliary pipeline (70) is provided with an air blower (71) and a pneumatic control valve (72) to control the amount of air entering.

5. A power generation and hydrogen production system coupling RSOC with blast furnace gas CCPP according to any one of claims 1 to 4, characterized in that: Pneumatic switch control valves are provided on each pipeline of the CCPP system connected to the RSOC stack (30), the connecting pipeline between the air compressor (21) and the combustion chamber (22), and the connecting pipeline between the blast furnace (10) and the RSOC stack (30) for controlling the opening and closing of the pipeline and regulating the flow rate.

6. The power generation and hydrogen production system coupled with RSOC and blast furnace gas CCPP according to claim 5, characterized in that: The system is divided into the following three working modes according to the reaction form of the RSOC stack: 1) RSOC stack power generation: the CCPP system is deactivated, the air blower (71) blows air into the air preheater (52) for heating and then inputs it into the cathode of the RSOC stack (30), the blast furnace gas from the first blast furnace gas outlet (11) passes through the gas blower (73) and enters the gas preheater (51) for heating and then inputs it into the anode of the RSOC stack (30), and the RSOC stack (30) operates at normal pressure to generate electricity; 2) The RSOC stack and the CCPP system jointly generate electricity: the pneumatic switch control valve between the air compressor (21) and the combustion chamber (22) is closed, the combustion chamber (22) does not work, the blast furnace gas enters the gas compressor (40) from the second blast furnace gas outlet (12) for compression, and is then heated by the gas preheater (51) and input to the anode of the RSOC stack (30). The air is compressed by the air compressor (21), heated by the air preheater (52), and input to the cathode of the RSOC stack (30). The RSOC stack (30) reacts to generate electricity. At the same time, the exhaust gas at the RSOC stack anode outlet (30c) enters the gas turbine (23) through the exhaust pipe (31), drives the gas turbine (23) to perform work, and generates electricity by the first generator (27); Or the pneumatic switch control valve between the air compressor (21) and the combustion chamber (22) is opened, and part of the air and blast furnace gas enter the RSOC stack (30) to react and generate electricity, and the other part enters the combustion chamber (22) together for combustion, and the combustion exhaust gas and the exhaust gas from the RSOC stack anode outlet (30c) enter the gas turbine (23) together, driving the gas turbine (23) to perform work and generate electricity by the first generator (27), while the gas turbine exhaust gas enters the waste heat boiler, and finally drives the second generator (26) to generate electricity; 3) Hydrogen production by coupling the RSOC stack with the CCPP system: Part of the water vapor generated by the waste heat boiler (24) in the CCPP system enters the anode of the RSOC stack (30) through the water vapor pipeline (241), and the other part enters the steam turbine (25). The steam turbine (25) performs work to drive the second generator (26) to generate electricity. The electricity enters the RSOC stack (30) to promote electrolysis reaction inside the RSOC stack (30), generating high-temperature hydrogen. The high-temperature hydrogen enters the hydrogen storage system from the anode inlet (30a) of the RSOC stack (30), and is stored in the hydrogen storage tank (64) after cooling, gas-water separation and compression.

7. The power generation and hydrogen production system coupling RSOC and blast furnace gas CCPP according to claim 6, characterized in that: The gas preheater (51) is also connected to the anode outlet (30c) of the RSOC stack and uses the tail gas at the anode outlet (30c) to heat the blast furnace gas; the air preheater (52) is also connected to the cathode outlet (30d) of the RSOC stack and uses the high-temperature air at the cathode outlet (30d) to heat the air.

8. The power generation and hydrogen production system coupled with RSOC and blast furnace gas CCPP system according to claim 6, characterized in that: The air preheater (52) heats the air to 650-1000°C, and the gas preheater (52) heats the gas to 600-1000°C, and the difference between the heated air temperature and the blast furnace gas temperature is less than or equal to 50°C.

9. The power generation and hydrogen production system coupled with RSOC and blast furnace gas CCPP according to claim 6, characterized in that: During the hydrogen production process of the RSOC stack (30) coupled with the CCPP system, the produced hydrogen can also be returned to the blast furnace (10) for blast furnace ironmaking.

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