A solar-driven electricity-heat-hydrogen-iron co-production system and operation method

Abstract

The application discloses a solar-driven electricity-heat-hydrogen-iron co-production system and an operation method thereof. The system comprises a solar power generation system, a water electrolysis hydrogen production system, an electric heating system and a hydrogen-rich metallurgical system. The solar power generation system can be selected from photovoltaic power generation or photo-thermal power generation. Part of the generated electricity enters the water electrolysis hydrogen production system to produce hydrogen, and the other part of the generated electricity heats reducing gas. High-temperature reducing gas reduces iron ore to produce molten iron. When solar energy is sufficient, the solar energy is consumed by increasing the hydrogen production rate and the hydrogen temperature. When solar energy is insufficient, the consumption of solar energy is reduced by reducing the hydrogen production rate and the reducing gas temperature. The impact of solar energy fluctuation on the co-production system is alleviated, and the safe operation of the system is maintained. The application realizes the production of "green hydrogen" by "green electricity". Through the process of "green hydrogen" metallurgy, the utilization rate of solar energy is effectively improved, the carbon emission of the metallurgical process is greatly reduced, and the application is an effective method for consumption of new energy and reduction of carbon emission in high-carbon industries.

Description

Technical Field

[0001] The present invention belongs to the technical field of renewable energy utilization, and in particular relates to a solar-driven electricity-heat-hydrogen-iron cogeneration system and an operation method thereof. Background Art

[0002] The intermittent and fluctuating nature of solar energy means that traditional methods of utilizing it for power generation and grid connection pose challenges to the safe and stable operation of the power system. Hydrogen is a clean and efficient energy carrier with widespread applications in transportation, metallurgy, energy, and other fields. Using the electricity generated by solar power generation to produce hydrogen through water electrolysis is a key method for producing "green hydrogen" and an important measure for improving the utilization rate of solar energy. Furthermore, using hydrogen to replace part of the carbon monoxide used to reduce iron ore to produce molten iron can significantly reduce carbon emissions in metallurgical processes, which is of great significance for promoting green development in the metallurgical industry.

[0003] The co-production system of using "green electricity" generated by solar energy to obtain "green hydrogen" and using "green hydrogen" to replace part of the carbon monoxide reducing gas for metallurgy not only promotes the large-scale utilization of renewable energy, but also effectively promotes the development of low-carbon emissions in high-carbon industries, providing strong technical support for achieving my country's "dual carbon" goals. Summary of the Invention

[0004] In response to the problems of intermittent renewable energy generation being difficult to directly connect to the grid at a high proportion and high carbon emissions in the metallurgical industry, the purpose of the present invention is to propose a solar-driven electricity-heat-hydrogen-iron cogeneration system and operation method, to realize the "green electricity" to "green hydrogen" and "green hydrogen" metallurgical carbon reduction production process, and to alleviate the impact of solar energy fluctuations through molten salt storage tanks, hydrogen production rate, reducing gas temperature, etc., to achieve safe and stable operation of the cogeneration system, and promote the large-scale utilization of renewable energy and the high-quality coordinated development of the metallurgical industry.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A solar-driven electricity-heat-hydrogen-iron cogeneration system, comprising a solar power generation system, a water electrolysis hydrogen production system, an electric heating system, and a hydrogen-rich metallurgy system;

[0007] The solar power generation system may be a photovoltaic power generation system or a solar thermal power generation system.

[0008] The solar thermal power generation system includes a heliostat 2, an absorber 3, a cold molten salt pump 4, a cold molten salt storage tank 5, a hot molten salt storage tank 6, a hot molten salt pump 7, a steam generator 8 and a generator 9; the heliostat 2 reflects sunlight 1 into the absorber 3, the cold molten salt outlet of the cold molten salt storage tank 5 is connected to the cold molten salt inlet of the absorber 3 through the cold molten salt pump 4, the hot molten salt outlet of the absorber 3 is connected to the hot molten salt inlet of the hot molten salt storage tank 6, the hot molten salt inlet of the steam generator 8 is connected to the hot molten salt outlet of the hot molten salt storage tank 6 through the hot molten salt pump 7, the cold molten salt outlet of the steam generator 8 is connected to the cold molten salt inlet of the cold molten salt tank 5, and the steam generator 8 is connected to the generator 9;

[0009] The photovoltaic power generation system includes a photovoltaic array 10 and a battery 11; the sun 1 shines on the photovoltaic array 10 to output electrical power, and a portion of the power enters the battery 11 for storage;

[0010] The water electrolysis hydrogen production system includes an electrolytic cell 12; in a solar thermal power generation system, part of the electricity output by the generator 9 is fed into the electrolytic cell 12; in a photovoltaic power generation system, part of the electricity output by the photovoltaic array 10 is fed into the electrolytic cell 12;

[0011] The electric heating system includes an electric heater 13; in a solar thermal power generation system, part of the electricity output by the generator 9 is fed into the electric heater 13; in a photovoltaic power generation system, part of the electricity output by the photovoltaic array 10 is fed into the electric heater 13 to heat the reducing gas formed by mixing carbon monoxide with hydrogen from the electrolyzer 12, and output high-temperature reducing gas;

[0012] The hydrogen-rich metallurgical system includes a reduction melting furnace 14; high-temperature reducing gas from the outlet of the electric heater 13 is fed into the reduction melting furnace 14 to generate molten iron;

[0013] Furthermore, when the solar power generation system selects a solar thermal power generation system, the temperature of the hot molten salt at the outlet of the absorber 3 is maintained by adjusting the power of the cold molten salt pump 4. The steam generator 8 is a partition-type heat exchanger. The heat exchange capacity of the steam generator 8 is adjusted by adjusting the power of the hot molten salt pump 7, thereby adjusting the power output of the generator 9.

[0014] Furthermore, when the solar power generation system selects a photothermal power generation system, the sum of the electricity fed into the electrolytic cell 12 and the electric heater 13 is equal to the electricity output by the generator 9 .

[0015] Furthermore, when the solar power generation system selects a photovoltaic power generation system, the electricity during the charging process of the battery 11 comes from the photovoltaic array 10, and the electricity output during the discharging process is sent to the electric heater 13.

[0016] Furthermore, when the solar power generation system selects a photovoltaic power generation system, the sum of the electricity fed into the electrolytic cell 12 , the electric heater 13 , and the battery 11 is equal to the electricity output by the photovoltaic array 10 .

[0017] Furthermore, the electrolytic cell 12 can be an alkaline water electrolysis cell or a proton exchange membrane cell.

[0018] Furthermore, the temperature range of the high-temperature reducing gas at the outlet of the electric heater 13 is 800° C. to 1000° C.

[0019] Furthermore, in order to improve the utilization rate of the reducing gas, the proportion of hydrogen fed into the reducing melting furnace 14 to the reducing gas increases with increasing temperature. When the temperature is 800°C, the proportion of hydrogen to the reducing gas is 21% to 65%. When the temperature is 900°C, the proportion of hydrogen to the reducing gas is 33% to 78%. When the temperature is 1000°C, the proportion of hydrogen to the reducing gas is 40% to 88%.

[0020] A method for operating a solar-powered electricity-heat-hydrogen-iron cogeneration system, characterized by:

[0021] When the solar power generation system is a solar thermal power generation system,

[0022] 1) When the cogeneration system is operating at the design operating conditions, the flow rate from the outlet of the absorber 3 into the hot molten salt storage tank 6 is equal to the molten salt flow rate from the hot molten salt storage tank 6 into the steam generator 8, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0023] 2) When there is sufficient sunlight and the capacity of the molten salt storage tank 6 is sufficient, the flow rate from the outlet of the absorber 3 into the molten salt storage tank 6 is greater than the molten salt flow rate from the molten salt storage tank 6 into the steam generator 8. At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0024] 3) When there is sufficient sunlight and the capacity of the molten salt storage tank 6 is insufficient, the flow rate of the absorber 3 outlet flowing into the molten salt storage tank 6 is less than or equal to the molten salt flow rate of the molten salt storage tank 6 flowing into the steam generator 8. At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is less than 78%, increase the proportion of hydrogen in the reducing gas; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 78%, increase the temperature of the high-temperature reducing gas;

[0025] 4) When the sunlight is insufficient and there is sufficient molten salt in the molten salt storage tank 6, the flow rate from the outlet of the absorber 3 into the molten salt storage tank 6 is less than the molten salt flow rate from the molten salt storage tank 6 into the steam generator 8. At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0026] 5) When there is insufficient light and insufficient molten salt in the molten salt storage tank 6, the flow rate of the absorber 3 outlet flowing into the molten salt storage tank 6 is equal to the molten salt flow rate of the molten salt storage tank 6 flowing into the steam generator 8. At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is higher than 33%, reduce the proportion of hydrogen in the reducing gas; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 33%, reduce the temperature of the high-temperature reducing gas.

[0027] When the solar power generation system is a photovoltaic power generation system,

[0028] 1) When the cogeneration system is operating at the designed operating conditions, the battery 11 is neither charged nor discharged, the temperature of the high-temperature reducing gas is 900° C., and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0029] 2) When there is sufficient sunlight and the battery 11 has sufficient reserve, the battery 11 is in charging mode. At this time, the temperature of the high-temperature reducing gas is 900° C., and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0030] 3) When there is sufficient sunlight and the battery 11 has insufficient reserve, the battery 11 is neither charged nor discharged. If the temperature of the high-temperature reducing gas is 900°C and the proportion of hydrogen in the reducing gas is less than 78%, the proportion of hydrogen in the reducing gas is increased; if the temperature of the high-temperature reducing gas is 900°C and the proportion of hydrogen in the reducing gas has reached 78%, the temperature of the high-temperature reducing gas is increased;

[0031] 4) When the sunlight is insufficient and the battery 11 is fully charged, the battery 11 is in a discharge mode and discharges the gas to the electric heater 13. At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0032] 5) When the sunlight is insufficient and the battery 11 is low on power, the battery 11 is neither charged nor discharged. If the temperature of the high-temperature reducing gas is 900°C and the proportion of hydrogen in the reducing gas is higher than 33%, the proportion of hydrogen in the reducing gas is reduced; if the temperature of the high-temperature reducing gas is 900°C and the proportion of hydrogen in the reducing gas has reached 33%, the temperature of the high-temperature reducing gas is reduced.

[0033] Compared with the prior art, the advantages of the present invention are as follows:

[0034] (1) The process flow of solar power generation - electric hydrogen production - electric heating - hydrogen metallurgy was proposed, which improved the utilization rate of renewable energy and reduced carbon emissions in high-carbon industries.

[0035] (2) The impact of solar energy fluctuations on the cogeneration system is smoothed by parameters such as the molten salt storage tank / battery charging and discharging mode, hydrogen production rate, and reducing gas temperature, ensuring the safe and stable operation of the system under various light intensities.

[0036] In short, not only has the utilization rate of solar energy been significantly improved, but carbon emissions have also been greatly reduced through hydrogen-rich metallurgical technology, providing a practical and effective way to achieve my country's "dual carbon" goals, and greatly promoting the optimization and upgrading of my country's energy structure and green and low-carbon development. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the system of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and examples.

[0039] The present invention provides a solar-driven electricity-heat-hydrogen-iron cogeneration system and operation method. The specific implementation method is as follows:

[0040] like Figure 1 As shown, a solar-driven electricity-heat-hydrogen-iron cogeneration system includes a solar power generation system, a water electrolysis hydrogen production system, an electric heating system and a hydrogen-rich metallurgical system;

[0041] The solar power generation system may be a photovoltaic power generation system or a solar thermal power generation system.

[0042] The solar thermal power generation system includes a heliostat 2, an absorber 3, a cold molten salt pump 4, a cold molten salt storage tank 5, a hot molten salt storage tank 6, a hot molten salt pump 7, a steam generator 8 and a generator 9; the heliostat 2 reflects sunlight 1 into the absorber 3, the cold molten salt outlet of the cold molten salt storage tank 5 is connected to the cold molten salt inlet of the absorber 3 through the cold molten salt pump 4, the hot molten salt outlet of the absorber 3 is connected to the hot molten salt inlet of the hot molten salt storage tank 6, the hot molten salt inlet of the steam generator 8 is connected to the hot molten salt outlet of the hot molten salt storage tank 6 through the hot molten salt pump 7, the cold molten salt outlet of the steam generator 8 is connected to the cold molten salt inlet of the cold molten salt tank 5, and the steam generator 8 is connected to the generator 9;

[0043] The photovoltaic power generation system includes a photovoltaic array 10 and a battery 11; the sun 1 shines on the photovoltaic array 10 to output electrical power, and a portion of the power enters the battery 11 for storage;

[0044] The water electrolysis hydrogen production system includes an electrolytic cell 12; in a solar thermal power generation system, part of the electricity output by the generator 9 is fed into the electrolytic cell 12; in a photovoltaic power generation system, part of the electricity output by the photovoltaic array 10 is fed into the electrolytic cell 12;

[0045] The electric heating system includes an electric heater 13; in a solar thermal power generation system, part of the electricity output by the generator 9 is fed into the electric heater 13; in a photovoltaic power generation system, part of the electricity output by the photovoltaic array 10 is fed into the electric heater 13 to heat the reducing gas formed by mixing carbon monoxide with hydrogen from the electrolyzer 12, and output high-temperature reducing gas;

[0046] The hydrogen-rich metallurgical system includes a reduction melting furnace 14; high-temperature reducing gas from the outlet of the electric heater 13 is fed into the reduction melting furnace 14 to generate molten iron.

[0047] Taking the solar thermal power generation system as an example, the solar power generation system selects the solar thermal power generation system, and maintains the temperature of the hot molten salt at the outlet of the absorber 3 by adjusting the power of the cold molten salt pump 4. The steam generator 8 is a partition-type heat exchanger, and the heat exchange capacity of the steam generator 8 is adjusted by adjusting the power of the hot molten salt pump 7, thereby adjusting the power output of the generator 9.

[0048] The solar power generation system selects a photothermal power generation system, and the sum of the electricity fed into the electrolytic cell 12 and the electric heater 13 is equal to the electricity output by the generator 9.

[0049] As a preferred embodiment of the present invention, the electrolytic cell 12 is an alkaline water electrolysis cell in consideration of commercial maturity.

[0050] Taking into account the temperature requirement for reducing iron ore in the reduction melting furnace 14, as a preferred embodiment of the present invention, the temperature range of the high-temperature reducing gas at the outlet of the electric heater 13 is 800°C to 1000°C.

[0051] As a preferred embodiment of the present invention, in order to improve the utilization rate of the reducing gas, the proportion of hydrogen fed into the reducing melting furnace 14 to the reducing gas increases with increasing temperature. When the temperature is 800°C, the proportion of hydrogen to the reducing gas is 21% to 65%. When the temperature is 900°C, the proportion of hydrogen to the reducing gas is 33% to 78%. When the temperature is 1000°C, the proportion of hydrogen to the reducing gas is 40% to 88%.

[0052] like Figure 1 As shown, an operation method of a solar-driven electricity-heat-hydrogen-iron cogeneration system is shown. In this embodiment, the solar power generation system adopts a photothermal power generation system. The operation method is as follows:

[0053] 1) When the cogeneration system is operating at the design operating conditions, the flow rate from the outlet of the absorber 3 into the hot molten salt storage tank 6 is equal to the molten salt flow rate from the hot molten salt storage tank 6 into the steam generator 8, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0054] 2) When there is sufficient sunlight and the capacity of the molten salt storage tank 6 is sufficient, the flow rate from the outlet of the absorber 3 into the molten salt storage tank is greater than the molten salt flow rate from the molten salt storage tank 6 into the steam generator 8. At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0055] 3) When there is sufficient sunlight and the capacity of the molten salt storage tank 6 is insufficient, the flow rate of the absorber 3 outlet flowing into the molten salt storage tank 6 is less than or equal to the molten salt flow rate of the molten salt storage tank 6 flowing into the steam generator 8. At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is less than 78%, increase the proportion of hydrogen in the reducing gas; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 78%, increase the temperature of the high-temperature reducing gas;

[0056] 4) When the sunlight is insufficient and there is sufficient molten salt in the molten salt storage tank 6, the flow rate from the outlet of the absorber 3 into the molten salt storage tank 6 is less than the molten salt flow rate from the molten salt storage tank 6 into the steam generator 8. At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%;

[0057] 5) When there is insufficient light and insufficient molten salt in the molten salt storage tank 6, the flow rate of the absorber 3 outlet flowing into the molten salt storage tank 6 is equal to the molten salt flow rate of the molten salt storage tank 6 flowing into the steam generator 8. At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is higher than 33%, reduce the proportion of hydrogen in the reducing gas; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 33%, reduce the temperature of the high-temperature reducing gas.

[0058] The solar power generation system can choose photovoltaic power generation and solar thermal power generation. Part of the generated electricity enters the water electrolysis hydrogen production system to produce hydrogen, and the other part enters the electric heating system to heat the reducing gas mixed with hydrogen and carbon monoxide. The high-temperature reducing gas enters the hydrogen-rich metallurgical system to reduce iron ore to produce molten iron; when solar energy is sufficient, the solar energy can be consumed by increasing the cold molten salt flow / battery charging, increasing the hydrogen production rate and hydrogen temperature, etc. When solar energy is insufficient, the solar energy consumption can be reduced by reducing the cold molten salt flow / battery discharge, reducing the hydrogen production rate and reducing gas temperature, etc., alleviating the impact of solar energy fluctuations on the co-generation system and maintaining the safe operation of the system; this system completes the "green electricity" to "green hydrogen" production, and through the "green hydrogen" metallurgical process, effectively improves the utilization rate of solar energy and significantly reduces the carbon emissions of metallurgical processes. It is an effective way to absorb new energy and reduce carbon emissions in high-carbon industries.

Claims

1. A solar-driven electricity-heat-hydrogen-iron cogeneration system, characterized by: Including solar power generation system, water electrolysis hydrogen production system, electric heating system and hydrogen-rich metallurgy system; The solar power generation system adopts a photovoltaic power generation system or a solar thermal power generation system; The solar thermal power generation system comprises a heliostat (2), a heat absorber (3), a cold molten salt pump (4), a cold molten salt storage tank (5), a hot molten salt storage tank (6), a hot molten salt pump (7), a steam generator (8) and a generator (9); the heliostat (2) reflects sunlight (1) into the heat absorber (3); the cold molten salt outlet of the cold molten salt storage tank (5) is connected to the cold molten salt inlet of the heat absorber (3) through the cold molten salt pump (4); the hot molten salt outlet of the heat absorber (3) is connected to the hot molten salt inlet of the hot molten salt storage tank (6); the hot molten salt outlet of the hot molten salt storage tank (6) is connected to the hot molten salt inlet of the steam generator (8) through the hot molten salt pump (7); the cold molten salt outlet of the steam generator (8) is connected to the cold molten salt inlet of the cold molten salt storage tank (5); and the steam generator (8) is connected to the generator (9); The photovoltaic power generation system comprises a photovoltaic array (10) and a storage battery (11); the sun (1) shines on the photovoltaic array (10) to output electric power, and a portion of the power enters the storage battery (11) for storage; The water electrolysis hydrogen production system includes an electrolytic cell (12); in a solar thermal power generation system, part of the electricity output by the generator (9) is fed into the electrolytic cell (12); in a photovoltaic power generation system, part of the electricity output by the photovoltaic array (10) is fed into the electrolytic cell (12); The electric heating system includes an electric heater (13); in a solar thermal power generation system, part of the electricity output by the generator (9) is fed into the electric heater (13); in a photovoltaic power generation system, part of the electricity output by the photovoltaic array (10) is fed into the electric heater (13), heating a reducing gas obtained by mixing carbon monoxide with hydrogen from an electrolytic cell (12), and outputting a high-temperature reducing gas; The hydrogen-rich metallurgical system includes a reduction melting furnace (14); high-temperature reducing gas from the outlet of the electric heater (13) is fed into the reduction melting furnace (14) to reduce iron ore to generate molten iron; In order to improve the utilization rate of the reducing gas, the proportion of hydrogen in the reducing gas fed into the reducing melting furnace (14) increases with increasing temperature. When the temperature is 800°C, the proportion of hydrogen in the reducing gas is 21% to 65%. When the temperature is 900°C, the proportion of hydrogen in the reducing gas is 33% to 78%. When the temperature is 1000°C, the proportion of hydrogen in the reducing gas is 40% to 88%.

2. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: When the solar power generation system selects a photothermal power generation system, the temperature of the hot molten salt at the outlet of the heat absorber (3) is maintained by adjusting the power of the cold molten salt pump (4). The steam generator (8) is a partition-type heat exchanger. The heat exchange capacity of the steam generator (8) is adjusted by adjusting the power of the hot molten salt pump (7), thereby adjusting the amount of electricity output by the generator (9).

3. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: When the solar power generation system selects a photothermal power generation system, the sum of the electricity fed into the electrolytic cell (12) and the electric heater (13) is equal to the electricity output by the generator (9).

4. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: When the solar power generation system is a photovoltaic power generation system, the electricity generated during the charging process of the storage battery (11) comes from the photovoltaic array (10), and the electricity output during the discharging process is sent to the electric heater (13).

5. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: When the solar power generation system selects a photovoltaic power generation system, the sum of the electricity fed into the electrolytic cell (12), the electric heater (13) and the storage battery (11) is equal to the electricity output by the photovoltaic array (10).

6. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: The electrolytic cell (12) is selected from an alkaline water electrolysis cell or a proton exchange membrane cell.

7. The solar-driven electricity-heat-hydrogen-iron cogeneration system according to claim 1, characterized in that: The temperature of the high-temperature reducing gas at the outlet of the electric heater (13) is in the range of 800°C to 1000°C.

8. The method for operating a solar-driven electricity-heat-hydrogen-iron cogeneration system according to any one of claims 1 to 7, characterized in that: When the solar power generation system is a solar thermal power generation system, 1) When the cogeneration system is operating at the design operating condition, the flow rate of the heat absorber (3) outlet flowing into the hot molten salt storage tank (6) is equal to the molten salt flow rate of the hot molten salt storage tank (6) flowing into the steam generator (8), the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%; 2) When there is sufficient sunlight and the capacity of the molten salt storage tank (6) is sufficient, the flow rate of the heat absorber (3) outlet flowing into the molten salt storage tank (6) is greater than the molten salt flow rate flowing from the molten salt storage tank (6) into the steam generator (8). At this time, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%; 3) When the sunlight is sufficient and the capacity of the molten salt storage tank (6) is insufficient, the flow rate of the heat absorber (3) outlet flowing into the molten salt storage tank (6) is less than or equal to the molten salt flow rate of the molten salt storage tank (6) flowing into the steam generator (8). At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is less than 78%, the proportion of hydrogen in the reducing gas is increased; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 78%, the temperature of the high-temperature reducing gas is increased; 4) When the sunlight is insufficient and the molten salt in the molten salt storage tank (6) is sufficient, the flow rate of the heat absorber (3) outlet flowing into the molten salt storage tank (6) is less than the molten salt flow rate of the molten salt storage tank (6) flowing into the steam generator (8), at which time the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%; 5) When the sunlight is insufficient and the molten salt in the molten salt storage tank (6) is insufficient, the flow rate of the heat absorber (3) outlet flowing into the molten salt storage tank (6) is equal to the molten salt flow rate of the molten salt storage tank (6) flowing into the steam generator (8). At this time, if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas is higher than 33%, the proportion of hydrogen in the reducing gas is reduced; if the temperature of the high-temperature reducing gas is at 900°C and the proportion of hydrogen in the reducing gas has reached 33%, the temperature of the high-temperature reducing gas is reduced; When the solar power generation system is a photovoltaic power generation system, 1) When the cogeneration system is operating at the design operating condition, the battery (11) is neither charged nor discharged, the temperature of the high-temperature reducing gas is 900°C, and the proportion of hydrogen in the reducing gas is 33% to 78%; 2) When there is sufficient sunlight and the battery (11) has sufficient reserve, the battery (11) is in a charging mode, at which time the temperature of the high-temperature reducing gas is 900° C., and the proportion of hydrogen in the reducing gas is 33% to 78%; 3) When the sunlight is sufficient and the battery (11) is insufficient, the battery (11) is neither charged nor discharged. If the temperature of the high-temperature reducing gas is at 900° C. and the proportion of hydrogen in the reducing gas is less than 78%, the proportion of hydrogen in the reducing gas is increased; if the temperature of the high-temperature reducing gas is at 900° C. and the proportion of hydrogen in the reducing gas has reached 78%, the temperature of the high-temperature reducing gas is increased; 4) When the sunlight is insufficient and the battery (11) is fully charged, the battery (11) is in a discharge mode and discharges to the electric heater (13). At this time, the temperature of the high-temperature reducing gas is 900° C., and the proportion of hydrogen in the reducing gas is 33% to 78%; 5) When the sunlight is insufficient and the battery (11) is low on power, the battery (11) is neither charged nor discharged. If the temperature of the high-temperature reducing gas is 900° C. and the proportion of hydrogen in the reducing gas is higher than 33%, the proportion of hydrogen in the reducing gas is reduced. If the temperature of the high-temperature reducing gas is 900° C. and the proportion of hydrogen in the reducing gas has reached 33%, the temperature of the high-temperature reducing gas is reduced.

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