Zero-carbon heat, electricity, hydrogen and oxygen cogeneration system and method for chemical parks based on solar energy

Abstract

The present invention provides a zero-carbon thermal power, hydrogen and oxygen co-generation system and method for a chemical park based on solar energy. The system includes: a solar thermal collector, a steam generator, a feed water preheater, a photovoltaic cell assembly, a water electrolysis hydrogen production device, a compressor, an electric motor, a first heat exchanger, a hydrogen storage tank, a second heat exchanger, an expander, a first generator, a third heat exchanger, a gas turbine, a second generator and a waste heat boiler with supplementary combustion; the input of the system of the present invention is solar energy, and the output is electricity, heat, hydrogen and oxygen required for the chemical industry, thereby realizing zero-carbon supply of thermal power, hydrogen and oxygen, reducing the consumption of fossil energy, and promoting low-carbon transformation in the chemical industry; the present invention adopts a hydrogen storage method to achieve stable operation of the system throughout the day and at night, solving the problem of intermittent volatility of solar energy resources.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoelectricity, hydrogen and oxygen co-generation, and in particular to a zero-carbon thermoelectricity, hydrogen and oxygen co-generation system and method for a chemical park based on solar energy. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Carbon dioxide emissions from the chemical industry account for 20% of total industrial emissions and 13% of total carbon dioxide emissions. Carbon dioxide emissions from the chemical industry mainly include: carbon dioxide emissions caused by net purchased electricity and heat, carbon dioxide emissions caused by raw material production, and carbon dioxide emissions caused by the combustion of fossil fuels in the production process.

[0004] At present, electricity and heat production still mainly relies on the combustion of fossil energy, which causes a large amount of carbon dioxide emissions. Hydrogen, as an important raw material in the chemical industry, is widely used in oil refining, synthetic ammonia, synthetic methanol and other fields. At present, hydrogen is mainly produced through fossil fuel production, which will cause carbon dioxide emissions during the production process. In addition, the chemical production process itself involves the combustion of a large amount of fossil fuels, which causes a large amount of carbon dioxide emissions. In addition, solar energy resources are being developed rapidly at this stage, and solar power installations are increasing rapidly. In addition, the intermittent and fluctuating characteristics of solar power pose severe challenges to the power system, resulting in a large amount of electricity being unable to be absorbed, resulting in abandoned light.

[0005] In summary, most of the existing photovoltaic, solar thermal, and hydrogen and oxygen production systems work independently, lack effective coordination, and are unable to achieve zero-carbon emission control within chemical parks. Summary of the Invention

[0006] In order to address the shortcomings of the existing technology, the present invention provides a solar-based zero-carbon thermal power, hydrogen and oxygen cogeneration system and method for a chemical park. The input is solar energy, and the output is electricity, heat, hydrogen and oxygen required for the chemical industry. This realizes the zero-carbon supply of thermal power, hydrogen and oxygen, reduces the consumption of fossil energy, and promotes the low-carbon transformation of the chemical industry. The use of hydrogen storage method realizes the stable operation of the system throughout the day and at night, solving the problem of intermittent volatility of solar energy resources.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A first aspect of the present invention provides a zero-carbon thermal power and hydrogen-oxygen cogeneration system for a chemical park based on solar energy.

[0009] A zero-carbon heat, power, hydrogen and oxygen cogeneration system for a chemical park based on solar energy, comprising: a solar thermal collector, a steam generator, a feed water preheater, a photovoltaic cell assembly, a water electrolysis hydrogen production device, a compressor, an electric motor, a first heat exchanger, a hydrogen storage tank, a second heat exchanger, an expander, a first generator, a third heat exchanger, a gas turbine, a second generator and a waste heat boiler with supplementary combustion;

[0010] The medium output port of the solar thermal collector is connected to the medium input port of the steam generator, the medium output port of the steam generator is connected to the medium input port of the solar thermal collector, the water input port of the steam generator is connected to the first port of the feedwater preheater, and the steam output port of the steam generator is connected to the steam output pipeline;

[0011] The second port of the feed water preheater is communicated with the first port of the first heat exchanger, the third port of the feed water preheater is communicated with the second port of the first heat exchanger, the third port of the first heat exchanger is communicated with the first port of the compressor, and the fourth port of the first heat exchanger is communicated with the hydrogen storage tank;

[0012] The hydrogen output port of the water electrolysis hydrogen production device is connected to the gas supply pipeline and the second port of the compressor respectively, and the oxygen output port of the water electrolysis hydrogen production device is connected to the oxygen supply pipeline;

[0013] The output end of the photovoltaic cell assembly is respectively connected to the water electrolysis hydrogen production device, the motor and the park power supply line, and the motor is connected to the compressor;

[0014] The output port of the hydrogen storage tank is connected to the hydrogen input port of the second heat exchanger, the hydrogen output port of the second heat exchanger is connected to the first port of the expander, the second port of the expander is connected to the first generator, the third port of the expander is connected to the hydrogen input port of the third heat exchanger, and the hydrogen output port of the third heat exchanger is respectively connected to the first port of the gas turbine, the first port of the waste heat boiler with supplementary combustion, and the hydrogen supply pipeline;

[0015] The first port of the second heat exchanger is connected to the steam output pipeline, the second port of the second heat exchanger is connected to the water supply pipeline, the first port of the third heat exchanger is connected to the steam output pipeline, and the second port of the third heat exchanger is connected to the water supply pipeline;

[0016] The second port of the gas turbine is connected to the second generator, the third port of the gas turbine is connected to the second port of the supplementary-fired waste heat boiler, the third port of the supplementary-fired waste heat boiler is connected to the water supply pipeline, the fourth port of the supplementary-fired waste heat boiler is connected to the steam output pipeline, and the fifth port of the supplementary-fired waste heat boiler is connected to the flue gas pipeline;

[0017] The transmission ports of the first generator and the second generator are both connected to the park power supply line.

[0018] The second aspect of the present invention provides a zero-carbon thermal power and hydrogen-oxygen cogeneration method for a chemical park based on solar energy.

[0019] A solar-based zero-carbon cogeneration method for heat, electricity, and hydrogen in a chemical park, utilizing the solar-based zero-carbon cogeneration system for heat, electricity, and hydrogen in a chemical park described in the first aspect of the present invention, comprises the following steps:

[0020] During the day, the low-temperature heat collecting medium is heated by solar energy in the solar thermal collector, and the high-temperature heat collecting medium exchanges heat in the steam generator, heating the feed water to generate steam. The temperature of the heat collecting medium decreases and then flows back to the solar thermal collector for heating.

[0021] Furthermore, during the day, the supply water is heated in the water preheater and then enters the steam generator, where it is heated by the photothermal heat collecting medium and converted into steam. The hydrogen is compressed by the compressor, and its temperature rises. The water is heated by the first heat exchanger, and the heated hot water is used in the water preheater to preheat the supply water.

[0022] Furthermore, during the day, photovoltaic cell modules absorb solar radiation to generate electricity. Photovoltaic power generation is divided into three parts: one part is used to supply the water electrolysis hydrogen production device, one part is used to power the electric motor of the hydrogen compressor, and the third part is used to supply the chemical company's daytime electricity needs.

[0023] Furthermore, during the day, the electricity demand of the water electrolysis hydrogen production device is met by photovoltaic power generation, and water is supplied to the water electrolysis hydrogen production device to generate oxygen and hydrogen. The oxygen is used to meet the oxygen demand of chemical companies;

[0024] The generated hydrogen is divided into two parts. One part is used to supply the daily hydrogen needs of chemical companies, and the other part is compressed by the compressor and stored in a hydrogen storage tank. After compression, the temperature of the hydrogen increases and it is cooled by water through the first heat exchanger.

[0025] Furthermore, at night, the hydrogen in the hydrogen storage tank is heated by the second heat exchanger and then enters the expander to expand and generate electricity, which is used to meet the power needs of the chemical company.

[0026] After expansion and work, the pressure and temperature of the hydrogen drop. After being heated in the third heat exchanger, the temperature and pressure of the hydrogen reach the gas turbine inlet requirements. At this time, the hydrogen is divided into three parts. The first part is directly used to supply the hydrogen needs of chemical companies at night. The second part enters the gas turbine for combustion and expansion to generate power, which is used to supply the electricity needs of chemical companies at night. The third part of the hydrogen enters the waste heat boiler with supplementary combustion for combustion, and is used together with the exhaust gas of the gas turbine to heat water at night to generate steam, which meets the steam needs of chemical companies at night.

[0027] Furthermore, the exhaust gas from the gas turbine enters the waste heat boiler with supplementary combustion, and the exhaust gas from the waste heat boiler with supplementary combustion is discharged into the atmosphere after heat exchange.

[0028] Furthermore, when switching from daytime to nighttime mode, the nighttime mode system starts in advance before nightfall, so that the daytime mode provides the heating steam required for starting the nighttime mode. After the nighttime mode starts and runs smoothly for the set time, the daytime mode stops.

[0029] When switching from night mode to day mode, the day mode system starts in advance before the arrival of daylight, so that the night mode provides the heating steam required for starting the day mode. After the day mode starts and runs smoothly for the set time, the night mode shuts down.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The solar-based zero-carbon thermal power, hydrogen, and oxygen cogeneration system and method for chemical parks described in the present invention uses solar energy as input and outputs electricity, heat, hydrogen, and oxygen necessary for the chemical industry. This achieves zero-carbon supply of thermal power, hydrogen, and oxygen, reduces fossil energy consumption, and promotes a low-carbon transformation in the chemical industry.

[0032] 2. The solar-based zero-carbon thermal power and hydrogen-oxygen cogeneration system and method for chemical parks described in the present invention adopts a hydrogen storage method to achieve stable operation of the system throughout the day and at night, solving the problem of intermittent fluctuations in solar energy resources.

[0033] 3. The solar-based zero-carbon thermal power, hydrogen and oxygen cogeneration system and method for chemical parks described in the present invention are based on solar energy to provide the required electricity, heat, hydrogen and oxygen for the chemical industry, provide a new path for the consumption of solar energy resources, reduce the abandonment of solar energy in the power grid, and provide feasible technical support for the accelerated development of solar energy resources.

[0034] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0036] Figure 1 This is a schematic structural diagram of a zero-carbon thermal power and hydrogen-oxygen cogeneration system for a chemical park based on solar energy provided in Example 1 of the present invention;

[0037] Among them, 1. Solar thermal collector; 2. Steam generator; 3. Feed water preheater; 4. Photovoltaic cell assembly; 5. Water electrolysis hydrogen production device; 6. Compressor; 7. Electric motor; 8. First heat exchanger; 9. Hydrogen storage tank; 10. Second heat exchanger; 11. Expander; 12. First generator; 13. Third heat exchanger; 14. Gas turbine; 15. Second generator; 16. Waste heat boiler with supplementary combustion. DETAILED DESCRIPTION

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

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and should not be understood as limiting the present invention.

[0042] In the present invention, terms such as "fixed connection," "connected," and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meanings of these terms in the present invention based on specific circumstances, and they should not be construed as limitations of the present invention.

[0043] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0044] Example 1:

[0045] like Figure 1As shown, embodiment 1 of the present invention provides a zero-carbon thermal power and hydrogen-oxygen cogeneration system for a chemical park based on solar energy, comprising: a solar thermal collector 1, a steam generator 2, a feed water preheater 3, a photovoltaic cell assembly 4, a water electrolysis hydrogen production device 5, a compressor 6, an electric motor 7, a first heat exchanger 8, a hydrogen storage tank 9, a second first heat exchanger 0, an expander 11, a first generator 12, a third first heat exchanger 3, a gas turbine 14, a second generator 15 and a waste heat boiler with supplementary combustion 16;

[0046] The medium output port of the solar thermal collector 1 is connected to the medium input port of the steam generator 2, the medium output port of the steam generator 2 is connected to the medium input port of the solar thermal collector 1, the water input port of the steam generator 2 is connected to the first port of the feedwater preheater 3, and the steam output port of the steam generator 2 is connected to the steam output pipeline;

[0047] The second port of the feed water preheater 3 is communicated with the first port of the first heat exchanger 8, the third port of the feed water preheater 3 is communicated with the second port of the first heat exchanger 8, the third port of the first heat exchanger 8 is communicated with the first port of the compressor 6, and the fourth port of the first heat exchanger 8 is communicated with the hydrogen storage tank 9;

[0048] The hydrogen output port of the water electrolysis hydrogen production device 5 is connected to the gas supply pipeline and the second port of the compressor 6 respectively, and the oxygen output port of the water electrolysis hydrogen production device 5 is connected to the oxygen supply pipeline;

[0049] The output end of the photovoltaic cell assembly 4 is respectively connected to the water electrolysis hydrogen production device 5, the motor 7 and the park power supply line, and the motor 7 is connected to the compressor 6;

[0050] The output port of the hydrogen storage tank 9 is connected to the hydrogen input port of the second first heat exchanger 0, the hydrogen output port of the second first heat exchanger 0 is connected to the first port of the expander 11, the second port of the expander 11 is connected to the first generator 12, the third port of the expander 11 is connected to the hydrogen input port of the third first heat exchanger 3, and the hydrogen output port of the third first heat exchanger 3 is respectively connected to the first port of the gas turbine 14, the first port of the waste heat boiler with supplementary combustion 16, and the hydrogen supply pipeline;

[0051] The first port of the second first heat exchanger 0 is connected to the steam output pipeline, the second port of the second first heat exchanger 0 is connected to the water supply pipeline, the first port of the third first heat exchanger 3 is connected to the steam output pipeline, and the second port of the third first heat exchanger 3 is connected to the water supply pipeline;

[0052] The second port of the gas turbine 14 is connected to the second generator 15, the third port of the gas turbine 14 is connected to the second port of the supplementary-fired waste heat boiler 16, the third port of the supplementary-fired waste heat boiler 16 is connected to the water supply pipeline, the fourth port of the supplementary-fired waste heat boiler 16 is connected to the steam output pipeline, and the fifth port of the supplementary-fired waste heat boiler 16 is connected to the flue gas pipeline;

[0053] The transmission ports of the first generator 12 and the second generator 15 are both connected to the park power supply line.

[0054] In this embodiment, the solar thermal collector 1 is one or more solar thermal collectors connected in parallel.

[0055] In this embodiment, the compressor 6 is a single compressor or a plurality of compressors connected in series, and the expander 11 is a single compressor or a plurality of compressors connected in series.

[0056] Example 2:

[0057] Example 2 of the present invention provides a zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy, which utilizes the zero-carbon heat, power, hydrogen and oxygen cogeneration system for a chemical park based on solar energy described in Example 1 of the present invention, and includes the following processes:

[0058] During the day, the low-temperature heat collecting medium is heated in the solar thermal collector 1 by solar energy, and the high-temperature heat collecting medium exchanges heat in the steam generator 2 to heat the feed water to generate steam. The temperature of the heat collecting medium decreases and then flows back to the solar thermal collector 1 to be heated.

[0059] During the day, the water supply is heated by the water supply preheater 3 and then enters the steam generator 2. In the steam generator 2, it is heated by the solar thermal heat collecting medium and then converted into steam to supply the steam demand of the chemical enterprise. The hydrogen is compressed by the compressor and its temperature is increased. After passing through the first heat exchanger 8, the heated hot water is used to preheat the water supply in the water supply heat exchanger, thereby fully utilizing the thermal energy and improving the comprehensive utilization rate of energy.

[0060] During the day, the photovoltaic cell assembly 4 absorbs solar radiation to generate electricity. The photovoltaic power generation is divided into three parts: one part is used to supply the water electrolysis hydrogen production device 5, one part is used to power the motor of the hydrogen compressor 6, and the third part is used to meet the daytime electricity needs of the chemical enterprise;

[0061] During the day, the electricity demand of the water electrolysis hydrogen production device 5 is supplied by the photovoltaic cell assembly 4, and water is supplied to the water electrolysis hydrogen production device 5 to generate oxygen and hydrogen. The oxygen is used to supply the oxygen demand of the chemical enterprise. The chemical enterprise can build its own oxygen storage tank to meet the oxygen supply throughout the day. The generated hydrogen is divided into two parts, one part is used to supply the daytime hydrogen demand of the chemical enterprise, and the other part enters the compressor 6 for compression and is stored in the hydrogen storage tank 9. After compression, the temperature of the hydrogen increases and is cooled by water through the first heat exchanger. The heat is used to preheat the water, so that the thermal energy is fully utilized.

[0062] At night, the hydrogen in the hydrogen storage tank 9 is heated and heated by the second heat exchanger 10, and then enters the expander 11 for expansion to generate electricity, and the electricity is used to supply the electricity needs of the chemical enterprise; the pressure and temperature of the hydrogen after expansion and work drop, and after being heated and heated by the third heat exchanger 13, the hydrogen temperature and pressure meet the gas turbine inlet requirements. At this time, the hydrogen is divided into three parts. The first part is directly used to supply the hydrogen needs of the chemical enterprise at night, the second part of the hydrogen enters the gas turbine 14 for combustion and expansion to generate electricity, which is used to supply the electricity needs of the chemical enterprise at night, and the exhaust gas of the gas turbine 14 enters the afterheat boiler with supplementary combustion; the third part of the hydrogen enters the afterheat boiler with supplementary combustion 16 for combustion, and is used together with the exhaust gas of the gas turbine 14 to heat water at night to generate steam to supply the steam needs of the chemical enterprise at night. The flue gas of the afterheat boiler with supplementary combustion 16 is discharged into the atmosphere after heat exchange.

[0063] The method described in this embodiment is divided into two operating modes: daytime and nighttime:

[0064] When switching from daytime to nighttime mode, the nighttime mode system should be started in advance before nightfall, so that the daytime mode system can provide the heating steam required for starting the nighttime mode system. The daytime mode system can be shut down only after the nighttime mode system starts and runs smoothly.

[0065] When switching to day mode at night, the day mode system should be started in advance before the arrival of daylight, so that the night mode system can provide the day mode system with the heating steam required for startup. The night mode system can only be shut down after the day mode starts and runs smoothly.

[0066] In this embodiment, daytime refers to the time from sunrise to sunset, and nighttime refers to the time from sunset to sunrise.

[0067] In this embodiment, zero carbon refers to achieving zero carbon dioxide emissions during the production process through scheme design; solar thermal refers to converting solar energy into thermal energy through technical means for utilization; photovoltaic is the abbreviation of the photovoltaic effect, which can directly convert solar radiation energy into electrical energy; steam generator refers to mechanical equipment that uses the thermal energy of fuel or other energy sources to heat water into steam; thermoelectric hydrogen and oxygen combined supply system refers to a system that uses certain methods to simultaneously supply electricity, thermal energy, hydrogen and oxygen to users.

[0068] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A zero-carbon heat, power, hydrogen and oxygen cogeneration system for a chemical park based on solar energy, characterized by: The medium output port of the solar thermal collector is connected to the medium input port of the steam generator, the medium output port of the steam generator is connected to the medium input port of the solar thermal collector, the water input port of the steam generator is connected to the first port of the feedwater preheater, and the steam output port of the steam generator is connected to the steam output pipeline; The second port of the feed water preheater is communicated with the first port of the first heat exchanger, the third port of the feed water preheater is communicated with the second port of the first heat exchanger, the third port of the first heat exchanger is communicated with the first port of the compressor, and the fourth port of the first heat exchanger is communicated with the hydrogen storage tank; The hydrogen output port of the water electrolysis hydrogen production device is connected to the gas supply pipeline and the second port of the compressor respectively, and the oxygen output port of the water electrolysis hydrogen production device is connected to the oxygen supply pipeline; the output end of the photovoltaic cell assembly is connected to the water electrolysis hydrogen production device, the motor and the park power supply line respectively, and the motor is connected to the compressor; The output port of the hydrogen storage tank is connected to the hydrogen input port of the second heat exchanger, the hydrogen output port of the second heat exchanger is connected to the first port of the expander, the second port of the expander is connected to the first generator, the third port of the expander is connected to the hydrogen input port of the third heat exchanger, and the hydrogen output port of the third heat exchanger is respectively connected to the first port of the gas turbine, the first port of the waste heat boiler with supplementary combustion, and the hydrogen supply pipeline; The first port of the second heat exchanger is connected to the steam output pipeline, the second port of the second heat exchanger is connected to the water supply pipeline, the first port of the third heat exchanger is connected to the steam output pipeline, and the second port of the third heat exchanger is connected to the water supply pipeline; The second port of the gas turbine is connected to the second generator, the third port of the gas turbine is connected to the second port of the supplementary-fired waste heat boiler, the third port of the supplementary-fired waste heat boiler is connected to the water supply pipeline, the fourth port of the supplementary-fired waste heat boiler is connected to the steam output pipeline, and the fifth port of the supplementary-fired waste heat boiler is connected to the flue gas pipeline; the power transmission ports of the first generator and the second generator are both connected to the park power supply line; At night, the hydrogen in the hydrogen storage tank is heated by the second heat exchanger and then enters the expander to expand and generate electricity, which is used to meet the power needs of the chemical company. After expansion and work, the pressure and temperature of the hydrogen drop. After being heated in the third heat exchanger, the temperature and pressure of the hydrogen reach the gas turbine inlet requirements. At this time, the hydrogen is divided into three parts. The first part is directly used to supply the hydrogen needs of chemical companies at night. The second part enters the gas turbine for combustion and expansion to generate power, which is used to supply the electricity needs of chemical companies at night. The third part of the hydrogen enters the waste heat boiler with supplementary combustion for combustion, and is used together with the exhaust gas of the gas turbine to heat water at night to generate steam, which meets the steam needs of chemical companies at night.

2. The zero-carbon heat, power, hydrogen and oxygen cogeneration system for a chemical park based on solar energy according to claim 1, characterized in that: The solar thermal collector is one or more solar thermal collectors connected in parallel.

3. The solar-based zero-carbon heat, power, hydrogen and oxygen cogeneration system for a chemical park according to claim 1, characterized in that: The compressor is a single compressor or a plurality of compressors connected in series, and the expander is a single compressor or a plurality of compressors connected in series.

4. A zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy, characterized by: Utilizing the solar-based zero-carbon thermal power and hydrogen-oxygen cogeneration system for a chemical park as described in any one of claims 1 to 3, The following processes are included: During the day, the low-temperature heat collecting medium is heated by solar energy in the solar thermal collector, and the high-temperature heat collecting medium exchanges heat in the steam generator, heating the feed water to generate steam. The temperature of the heat collecting medium decreases and then flows back to the solar thermal collector for heating.

5. The zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy according to claim 4, characterized in that: During the day, the supply water is heated in the feed water preheater and then enters the steam generator. In the steam generator, it is heated by the solar thermal collector medium and becomes steam. The hydrogen is compressed by the compressor and its temperature increases. The water is heated by the first heat exchanger. The heated hot water is used in the feed water preheater to preheat the supply water.

6. The zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy according to claim 4, characterized in that: During the day, photovoltaic cell modules absorb solar radiation to generate electricity. Photovoltaic power generation is divided into three parts: one part is used to supply water electrolysis hydrogen production equipment, one part is used to power the electric motor of the hydrogen compressor, and the third part is used to supply the electricity needs of chemical companies during the daytime.

7. The zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy according to claim 4, characterized in that: During the day, the electricity demand of the water electrolysis hydrogen production device is met by photovoltaic power generation, and water is supplied to the water electrolysis hydrogen production device to generate oxygen and hydrogen. The oxygen is used to meet the oxygen demand of chemical companies; The generated hydrogen is divided into two parts. One part is used to supply the daily hydrogen needs of chemical companies, and the other part is compressed by the compressor and stored in a hydrogen storage tank. After compression, the temperature of the hydrogen increases and it is cooled by water through the first heat exchanger.

8. The zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy according to claim 4, characterized in that: The exhaust gas from the gas turbine enters the waste heat boiler with supplementary combustion, and the exhaust gas from the waste heat boiler with supplementary combustion is discharged into the atmosphere after heat exchange.

9. The zero-carbon heat, power, hydrogen and oxygen cogeneration method for a chemical park based on solar energy according to any one of claims 4 to 8, characterized in that: When switching from daytime to nighttime mode, the nighttime mode system starts in advance before nightfall, so that the daytime mode provides the heating steam required for starting the nighttime mode. After the nighttime mode starts and runs smoothly for the set time, the daytime mode stops. When switching from night mode to day mode, the day mode system starts in advance before the arrival of daylight, so that the night mode provides the heating steam required for starting the day mode. After the day mode starts and runs smoothly for the set time, the night mode shuts down.

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