Semi-off-grid wind-light-ammonia-alcohol integrated system and method based on chemical looping combustion

Abstract

The invention discloses a semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion. The system comprises an intelligent scheduling system, a wind power system, a photovoltaic system, an energy storage system, a chemical looping combustion power generation system, a high-temperature electrolytic hydrogen production system, a gas compression cooling system, a gas storage system, a methanol synthesis system and an ammonia synthesis system. The wind power system, the photovoltaic system and the energy storage system are connected with the intelligent scheduling system; the gas storage system is connected with the intelligent scheduling system; the gas storage system is respectively connected with the methanol synthesis system and the ammonia synthesis system; the high-temperature electrolytic hydrogen production system is connected with the gas compression cooling system; the gas compression cooling system is connected with the storage system; the chemical looping combustion power generation system is connected with the gas compression cooling system; and the gas compression cooling system is connected with the gas storage system. According to the invention, renewable energy sources such as wind energy, photovoltaic energy and the like are combined with a coal chemical looping combustion technology, and greenization and sustainability of ammonia-alcohol production are realized through efficient storage and conversion of energy sources.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean production, and in particular relates to a semi-off-grid wind-solar-ammonia-alcohol integrated system and method based on chemical chain combustion. Background Art

[0002] At present, the global energy structure is transforming towards low-carbon and clean energy to cope with the increasingly severe climate change problems and energy security challenges. In this context, renewable energy such as wind and solar energy has been rapidly developed due to its abundance and low environmental impact. However, these energy forms have brought challenges to the stability and controllability of the power system due to their intermittent and volatile nature. How to efficiently utilize wind and solar resources while realizing energy storage and conversion has become a research hotspot in the current energy field.

[0003] Coal chemical chaining combustion technology is a new type of clean coal utilization technology with significant advantages of low carbon emissions and high efficiency. It uses metal oxides as oxygen carriers to avoid the participation of nitrogen in the combustion process, making CO2 easy to separate and capture. This technology can effectively reduce the environmental pollution caused by traditional coal combustion and provide an important way for the clean utilization of coal.

[0004] Liquid ammonia and methanol, as important clean energy carriers, have an important strategic position in the low-carbon transformation of renewable energy and fossil energy due to their high energy density, convenient storage and transportation, etc. Liquid ammonia has emerged in fuel applications with its zero-carbon emission characteristics, while methanol can be used not only as a fuel, but also as a chemical raw material and widely used in industrial production. However, renewable energy sources such as wind power and photovoltaic power generation are volatile and intermittent under natural conditions, posing a challenge to the stability of the power grid and energy utilization efficiency. Therefore, how to deeply integrate the preparation process of liquid ammonia and methanol with the utilization of renewable energy, make full use of their flexible production and energy storage characteristics, and smooth the fluctuations of new energy has become the current research focus in the field of clean energy development. Summary of the invention

[0005] The purpose of the present invention is to provide a semi-off-grid wind-solar-ammonia-methanol integrated system and method based on chemical chain combustion, combining renewable energy such as wind energy and photovoltaics with coal chemical chain combustion technology, and realizing green and sustainable ammonia-methanol production through efficient energy storage and conversion. On the one hand, the system can use wind and solar energy to provide heat and electricity for the chemical chain combustion process, solving the fossil energy dependence problem of traditional ammonia and methanol production; on the other hand, through the capture of CO2 in the chemical chain combustion process, the carbon source supply for ammonia-methanol production is realized, further reducing the carbon emission intensity.

[0006] The present invention provides a semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chain combustion, including an intelligent dispatching system, a wind power system, a photovoltaic system, an energy storage system, a chemical chain combustion power generation system, a high-temperature electrolysis hydrogen production system, a gas compression and cooling system, a gas storage system, a methanol synthesis system, and an ammonia synthesis system;

[0007] The wind power system and the photovoltaic system are connected to the intelligent dispatching system, and the dispatching of the power generation of new energy in the integrated system is realized through the intelligent dispatching system;

[0008] The energy storage system is connected to the intelligent dispatching system and receives dispatching instructions from the intelligent dispatching system to suppress power fluctuations in the integrated system;

[0009] The gas storage system is connected to the methanol synthesis system and is used to provide hydrogen and carbon dioxide gas to the methanol synthesis system;

[0010] The gas storage system is connected to the ammonia synthesis system and is used to provide nitrogen and hydrogen gases to the ammonia synthesis system;

[0011] The intelligent dispatching system dispatches the electric energy in the integrated system to provide electric energy to the high-temperature electrolysis hydrogen production system, the methanol synthesis system, the ammonia synthesis system and the power grid;

[0012] The high-temperature electrolysis hydrogen production system is connected to the gas compression cooling system to provide oxygen and hydrogen to the gas compression cooling system;

[0013] The gas compression and cooling system is connected to the gas storage system and is used to provide oxygen and hydrogen to the gas storage system;

[0014] The chemical chaining combustion power generation system is connected to the gas compression cooling system to provide nitrogen and carbon dioxide to the gas compression cooling system;

[0015] The gas compression and cooling system is connected to the gas storage system and is used to provide nitrogen and carbon dioxide to the gas storage system;

[0016] The gas compression and cooling system provides thermal energy to the high-temperature electrolytic hydrogen production system; the power generation of the chemical chaining combustion power generation system is dispatched by the intelligent dispatching system; the chemical chaining combustion power generation system provides thermal energy to the high-temperature electrolytic hydrogen production system.

[0017] Furthermore, the chemical chain combustion power generation system includes a heating device, a fuel reactor, an air reactor, an N2 purification cooling system, and a CO2 purification cooling system.

[0018] Furthermore, the high-temperature electrolysis hydrogen production system includes a solid oxide electrolyzer, an O2 cooler, an H2 cooler, a high-temperature heater, and a low-temperature heater.

[0019] Furthermore, the gas compression cooling system includes an O2 compression cooling system, an H2 compression cooling system, a CO2 compression cooling system, and an N2 compression cooling system.

[0020] Furthermore, the gas storage system includes an O2 storage tank, a H2 storage tank, a CO2 storage tank, and a N2 storage tank.

[0021] Furthermore, the energy storage system, photovoltaic system, wind power system, and steam cycle power generation system are connected to the power bus; the heating device is connected to the air reactor and the fuel reactor; the air reactor is connected to the fuel reactor; the air reactor is connected to the N2 purification cooling system, and the fuel reactor is connected to the CO2 purification cooling system; the N2 purification cooling system is connected to the N2 storage tank through the N2 compression cooling system, and the N2 storage tank is connected to the ammonia synthesis system; the CO2 purification cooling system is connected to the CO2 storage tank through the CO2 compression cooling system, and the CO2 storage tank is connected to the methanol synthesis system.

[0022] The N2 purification cooling system and the CO2 purification cooling system are connected to the steam cycle power generation system through a heating pipeline, and the steam cycle power generation system is connected to the heating device through a heating pipeline; the steam cycle power generation system is connected to the solid oxide electrolyzer through a heating pipeline, and the solid oxide electrolyzer is connected to the O2 cooler and the H2 cooler, and the O2 cooler and the H2 cooler are connected to the O2 storage tank and the H2 storage tank through the O2 compression cooling device and the H2 compression cooling device, respectively, and the O2 storage tank is connected to the air reactor, and the H2 storage tank is connected to the methanol synthesis system and the ammonia synthesis system;

[0023] The low-temperature heater is connected to the high-temperature heater, and the high-temperature heater is connected to the solid oxide electrolyzer; the O2 compression cooling system, the H2 compression cooling system, the CO2 compression cooling system, and the N2 compression cooling system are connected to the low-temperature heater through a heating pipeline; the O2 cooler and the H2 cooler are connected to the high-temperature heater through a heating pipeline.

[0024] The present invention also provides an operation method of the semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion, comprising:

[0025] The intelligent dispatching system optimizes the power and material output of the chemical chain combustion power generation system, high-temperature electrolysis hydrogen production system, methanol synthesis system and ammonia synthesis system according to the grid dispatching plan curve and wind and solar forecast data, and specifies the corresponding plan curve;

[0026] The storage and discharge process of the energy storage system is used to adjust the deviation between the planned curve and the actual power in real time according to the real-time power generation of wind power and photovoltaic power. At the same time, the output of each equipment is dispatched through the intelligent dispatching system to achieve stable output of system electricity and chemical processes.

[0027] Furthermore, during operation, the SOC of the energy storage system is always controlled within the range of 30%-70% to ensure that the integrated system has real-time power regulation capability.

[0028] Furthermore, the electricity generated by the wind power system, photovoltaic system, and steam cycle power generation system is used for hydrogen electrolysis and the O2 compression cooling system, H2 compression cooling system, CO2 compression cooling system, N2 compression cooling system, ammonia synthesis system, and methanol synthesis system in the integrated system, and the excess electricity is sold to the power grid; the energy storage system uses ternary lithium batteries for charging and discharging, which is used to smooth out the volatility of power generation generated by the wind power system and photovoltaic system.

[0029] Furthermore, the air is heated to 350°C by a heating device and then enters the air reactor. In the air reactor, the air and the low-valent oxygen carrier undergo an oxidation-reduction reaction, and the oxygen carrier increases from a low-valent state to a high-valent state, and releases a large amount of heat. The oxygen carrier with a higher valent state enters the fuel reactor. The air and oxygen carrier dust mixture after the reaction enters the N2 purification and cooling system. After passing through the N2 purification and cooling system, the oxygen carrier in the mixture is captured and returned to the air reactor to continue to participate in the reaction. At the same time, the air after the reaction is purified, and a small amount of impurity gas in the gas is removed and discharged, thereby obtaining high-concentration N2. The high-quality heat captured from the N2 purification and cooling system is transported to the steam cycle power generation system for generating high-quality steam; the obtained high-concentration N2 enters the N2 compression and cooling system for compression and cooling. The low-quality heat during the compression process is used for the low-temperature heating process of the desalted water during the hydrogen production process, and the compressed N2 enters the N2 storage tank for storage; the purpose of controlling the N2 production is achieved by controlling the amount of O2 added to the heated air, and the oxygen produced by hydrogen production is used as a supplementary source;

[0030] After water is heated to 350°C by a heating device, high-temperature steam is obtained. The high-temperature steam and coal enter the fuel reactor together, and undergo redox reaction with high-valent oxygen carriers in the fuel reactor. The oxygen carriers are reduced from high-valent to low-valent states and release heat. The oxygen carriers with reduced valence enter the air reactor. After water vapor reacts with coal, a high-humidity mixed gas is obtained and enters the CO2 purification and cooling system. After the CO2 purification and cooling system, the coal ash, moisture and a small amount of impurity gas in the mixed gas are captured and treated to obtain high-concentration CO2; the high-quality heat captured in the CO2 purification and cooling system is transported to the steam cycle power generation system for generating high-quality steam; the obtained high-concentration CO2 enters the CO2 compression and cooling system for compression and cooling, and the low-quality heat in the compression process is used for the low-temperature heating process of desalted water in the hydrogen production process, and the compressed N2 enters the N2 storage tank for storage; the N2 storage tank and the H2 storage tank are directly connected to the ammonia synthesis system for ammonia synthesis; the CO2 storage tank and the H2 storage tank are directly connected to the methanol synthesis system for methanol synthesis.

[0031] Through the above scheme, the semi-off-grid wind-solar-ammonia-alcohol integrated system and method based on chemical chain combustion has the following technical effects:

[0032] 1. Innovative application of coal chemical chain combustion technology. The coal chemical chain combustion technology is deeply coupled with the semi-off-grid wind and solar power generation system to achieve efficient and clean utilization of coal-based fuels and near-zero emissions of carbon dioxide. At the same time, it provides a stable heat source and carbon dioxide raw material for methanol synthesis in the system, breaking through the separation mode of traditional coal-fired power generation and chemical processes.

[0033] 2. Coordinated optimization design of wind and solar power and chemical processes. By taking advantage of the instability of wind and solar power generation, the system can achieve efficient use of renewable energy by designing a deep coupling mechanism of energy and matter with the ammonia and methanol production process. According to the fluctuation characteristics of wind and solar power generation, the system dynamically adjusts the chemical chain combustion process, ammonia and methanol production process, and improves the overall energy utilization efficiency and economy. It promotes the consumption of large-scale renewable energy and reduces the rate of power abandonment.

[0034] 3. Intelligent control and optimization of semi-off-grid integrated systems. The whole process of wind and solar power generation, coal chemical chain combustion, ammonia and methanol production is optimized and dispatched based on wind and solar power forecast feedforward intelligent dispatching technology, dynamically balancing energy supply and demand, maximizing the absorption capacity of renewable energy, and ensuring the continuity and stability of ammonia and methanol production, forming an innovative energy and chemical system model that adapts to multiple scenarios and multiple demands.

[0035] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion of the present invention;

[0037] Figure 2 This is a working flow chart of the semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chain combustion of the present invention. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] Ginseng Figure 1 , Figure 2 As shown, this embodiment provides a semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chain combustion, including an intelligent scheduling system, a wind power system, a photovoltaic system, an energy storage system, a chemical chain combustion power generation system, a high-temperature electrolysis hydrogen production system, a gas compression and cooling system, a gas storage system, an ammonia synthesis system, and a methanol synthesis system; the wind power system and the photovoltaic system are connected to the intelligent scheduling system, and the scheduling of new energy power generation in the integrated system is realized through the intelligent scheduling system; the energy storage system is connected to the intelligent scheduling system, and accepts the scheduling instructions of the intelligent scheduling system to suppress the fluctuation of electric energy in the integrated system; the gas storage system is connected to the methanol synthesis system, and is used to provide hydrogen and carbon dioxide gas to the methanol synthesis system; the gas storage system is connected to the ammonia synthesis system, and is used to provide nitrogen and hydrogen gas to the ammonia synthesis system; the intelligent scheduling system schedules the electric energy in the integrated system to provide electric energy to the high-temperature electrolysis hydrogen production system, the methanol synthesis system, the ammonia synthesis system and the power grid;

[0040] The high-temperature electrolytic hydrogen production system is connected to the gas compression and cooling system to provide oxygen and hydrogen to the gas compression and cooling system; the gas compression and cooling system is connected to the gas storage system to provide oxygen and hydrogen to the gas storage system; the chemical chaining combustion power generation system is connected to the gas compression and cooling system to provide nitrogen and carbon dioxide to the gas compression and cooling system; the gas compression and cooling system is connected to the gas storage system to provide nitrogen and carbon dioxide to the gas storage system; the gas compression and cooling system provides thermal energy to the high-temperature electrolytic hydrogen production system; the power generation of the chemical chaining combustion power generation system is dispatched by the intelligent dispatching system; the chemical chaining combustion power generation system provides thermal energy to the high-temperature electrolytic hydrogen production system.

[0041] The chemical chain combustion power generation system includes a heating device, a fuel reactor, an air reactor, an N2 purification cooling system, and a CO2 purification cooling system. The high-temperature electrolysis hydrogen production system includes a solid oxide electrolyzer, an O2 cooler, an H2 cooler, a high-temperature heater, and a low-temperature heater. The gas compression cooling system includes an O2 compression cooling system, an H2 compression cooling system, a CO2 compression cooling system, and an N2 compression cooling system. The gas storage system includes an O2 storage tank, an H2 storage tank, a CO2 storage tank, and a N2 storage tank.

[0042] The integrated system also includes a steam cycle power generation system, which is connected to the chemical chain combustion power generation system and the high-temperature electrolysis hydrogen production system, and is used to utilize the heat of the chemical chain combustion power generation system to generate steam for power generation and transfer the heat to the high-temperature electrolysis hydrogen production system.

[0043] Specifically, the energy storage system, photovoltaic system, wind power system, and steam cycle power generation system are connected to the power bus. The heating device is connected to the air reactor and the fuel reactor; the air reactor is connected to the fuel reactor; the air reactor is connected to the N2 purification cooling system, and the fuel reactor is connected to the CO2 purification cooling system; the N2 purification cooling system is connected to the N2 storage tank through the N2 compression cooling system, and the N2 storage tank is connected to the ammonia synthesis system; the CO2 purification cooling system is connected to the CO2 storage tank through the CO2 compression cooling system, and the CO2 storage tank is connected to the methanol synthesis system. The N2 purification cooling system and the CO2 purification cooling system are connected to the steam cycle power generation system through the heating pipeline, and the steam cycle power generation system is connected to the heating device through the heating pipeline; the steam cycle power generation system is connected to the solid oxide electrolyzer through the heating pipeline, and the solid oxide electrolyzer is connected to the O2 cooler and the H2 cooler, and the O2 cooler and the H2 cooler are connected to the O2 storage tank and the H2 storage tank through the O2 compression cooling device and the H2 compression cooling device respectively, and the O2 storage tank is connected to the air reactor; the H2 storage tank is connected to the methanol synthesis system and the ammonia synthesis system; the low-temperature heater is connected to the high-temperature heater, and the high-temperature heater is connected to the solid oxide electrolyzer; the O2 compression cooling system, the H2 compression cooling system, the CO2 compression cooling system, and the N2 compression cooling system are connected to the low-temperature heater through the heating pipeline; the O2 cooler and the H2 cooler are connected to the high-temperature heater through the heating pipeline.

[0044] The integrated system operates as follows:

[0045] The intelligent dispatching system rationally optimizes the power and material output of the chemical chain combustion power generation system, high-temperature electrolysis hydrogen production system, ammonia synthesis system and methanol synthesis system according to the grid dispatching plan curve and wind and solar forecast data, and specifies the corresponding plan curve. The storage and discharge process of the energy storage system is used to adjust the deviation between the plan curve and the actual power in real time according to the real-time power generation of wind power and photovoltaic power, and the output of each device in the system is dispatched at the same time to achieve stable output of system power and chemical processes. During operation, the SOC of the energy storage system is always controlled within the range of 30%-70% to ensure that the system has real-time power regulation capabilities.

[0046] The operation mode of the remaining equipment is as follows: the electricity generated by wind power, photovoltaic, and steam cycle power generation systems is mainly used for electrolytic hydrogen production and the compression and cooling systems of O2, H2, CO2, and N2 involved in the integrated system, and the synthesis process of ammonia and methanol. The excess electricity is sold to the power grid, but it should be noted that the electricity in the integrated system can only be sold to the power grid, and cannot be purchased from the power grid. The energy storage equipment in the system uses ternary lithium batteries for charging and discharging, which is used to smooth the volatility of power generation generated by the new energy system in the system.

[0047] The air is heated to 350℃ by the heating device and then enters the air reactor. In the air reactor, the air and the low-valent oxygen carrier undergo redox reaction, and the oxygen carrier increases from the low-valent state to the high-valent state, and releases a large amount of heat. The oxygen carrier with increased valence enters the fuel reactor. The air and oxygen carrier dust mixture after the reaction enters the N2 purification and cooling system. After passing through the N2 purification and cooling system, the oxygen carrier in the mixture is captured and returned to the air reactor to continue to participate in the reaction. At the same time, the air after the reaction is purified, and a small amount of impurity gas in the gas is removed and discharged, thereby obtaining high-concentration N2. Because the temperature of the mixed gas entering the N2 purification and cooling system is as high as 1100℃, the high-quality heat captured in this system will be transported to the steam cycle power generation system to generate high-quality steam. The obtained high-concentration N2 enters the N2 compression and cooling system for compression and cooling. The low-quality heat during the compression process is used for the low-temperature heating process of desalted water during the hydrogen production process. The compressed N2 enters the N2 storage tank for storage. It should be noted that in order to control the N2 production, O2 can be added to the heated air. In this method, oxygen produced by hydrogen production is used as a supplementary source.

[0048] After the water is heated to 350℃ by the heating device, high-temperature steam is obtained. The high-temperature steam and coal enter the fuel reactor together. In the fuel reactor, the high-valent oxygen carrier undergoes an oxidation-reduction reaction. The oxygen carrier is reduced from a high valent state to a low valent state and releases heat. The oxygen carrier with a reduced valent state enters the air reactor. After the water vapor reacts with the coal, a high-humidity mixed gas is obtained and enters the CO2 purification and cooling system. After the CO2 purification and cooling system, the coal ash, moisture and a small amount of impurities in the mixed gas are captured and processed to obtain high-concentration CO2. Because the temperature of the mixed gas entering the CO2 purification and cooling system is as high as 950℃, the high-quality heat captured in this system will be transported to the steam cycle power generation system to generate high-quality steam. The obtained high-concentration CO2 enters the CO2 compression and cooling system for compression and cooling. The low-quality heat during the compression process is used for the low-temperature heating process of desalted water in the hydrogen production process. The compressed N2 enters the N2 storage tank for storage.

[0049] The N2 storage tank and the H2 storage tank are directly connected to the ammonia synthesis system for the synthesis of ammonia alcohol; the CO2 storage tank and the H2 storage tank are directly connected to the methanol synthesis system for the synthesis of methanol.

[0050] On the one hand, this integrated operation system has opened up a new way for the clean utilization of coal resources and promoted the low-carbon transformation of the energy system through deep integration with renewable energy. On the other hand, the system provides technical support for the green upgrade of the ammonia and methanol production industries. At the same time, the semi-off-grid design can effectively reduce dependence on the power grid, improve the flexibility and stability of system operation, and provide a reference for the integrated development of the energy and chemical industries in the future.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chaining combustion, characterized in that: Including intelligent dispatching system, wind power system, photovoltaic system, energy storage system, chemical chain combustion power generation system, high temperature electrolysis hydrogen production system, gas compression and cooling system, gas storage system, methanol synthesis system, ammonia synthesis system; The wind power system and the photovoltaic system are connected to the intelligent dispatching system, and the dispatching of the power generation of new energy in the integrated system is realized through the intelligent dispatching system; The energy storage system is connected to the intelligent dispatching system and receives dispatching instructions from the intelligent dispatching system to suppress power fluctuations in the integrated system; The gas storage system is connected to the methanol synthesis system and is used to provide hydrogen and carbon dioxide gas to the methanol synthesis system; The gas storage system is connected to the ammonia synthesis system and is used to provide nitrogen and hydrogen gases to the ammonia synthesis system; The intelligent dispatching system dispatches the electric energy in the integrated system to provide electric energy to the high-temperature electrolysis hydrogen production system, the methanol synthesis system, the ammonia synthesis system and the power grid; The high-temperature electrolysis hydrogen production system is connected to the gas compression cooling system to provide oxygen and hydrogen to the gas compression cooling system; The gas compression and cooling system is connected to the gas storage system and is used to provide oxygen and hydrogen to the gas storage system; The chemical chaining combustion power generation system is connected to the gas compression cooling system to provide nitrogen and carbon dioxide to the gas compression cooling system; The gas compression and cooling system is connected to the gas storage system and is used to provide nitrogen and carbon dioxide to the gas storage system; The gas compression and cooling system provides thermal energy to the high-temperature electrolytic hydrogen production system; the power generation of the chemical chaining combustion power generation system is dispatched by the intelligent dispatching system; the chemical chaining combustion power generation system provides thermal energy to the high-temperature electrolytic hydrogen production system.

2. The semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chaining combustion according to claim 1 is characterized in that: The chemical chain combustion power generation system includes a heating device, a fuel reactor, an air reactor, an N2 purification cooling system, a CO2 purification cooling system, and a steam cycle power generation system.

3. The semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chaining combustion according to claim 2 is characterized in that: The high-temperature electrolysis hydrogen production system includes a solid oxide electrolyzer, an O2 cooler, a H2 cooler, a high-temperature heater, and a low-temperature heater.

4. The semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion according to claim 3 is characterized in that: The gas compression cooling system includes an O2 compression cooling system, an H2 compression cooling system, a CO2 compression cooling system, and an N2 compression cooling system.

5. The semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion according to claim 4 is characterized in that: The gas storage system includes an O2 storage tank, a H2 storage tank, a CO2 storage tank, and a N2 storage tank.

6. The semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical looping combustion according to claim 4 is characterized in that: The energy storage system, photovoltaic system, wind power system, and steam cycle power generation system are connected to the power bus; the heating device is connected to the air reactor and the fuel reactor; the air reactor is connected to the fuel reactor; the air reactor is connected to the N2 purification cooling system, and the fuel reactor is connected to the CO2 purification cooling system; the N2 purification cooling system is connected to the N2 storage tank through the N2 compression cooling system, and the N2 storage tank is connected to the ammonia synthesis system; the CO2 purification cooling system is connected to the CO2 storage tank through the CO2 compression cooling system, and the CO2 storage tank is connected to the methanol synthesis system; The N2 purification cooling system and the CO2 purification cooling system are connected to the steam cycle power generation system through a heating pipeline, and the steam cycle power generation system is connected to the heating device through a heating pipeline; the steam cycle power generation system is connected to the solid oxide electrolyzer through a heating pipeline, and the solid oxide electrolyzer is connected to the O2 cooler and the H2 cooler, and the O2 cooler and the H2 cooler are connected to the O2 storage tank and the H2 storage tank through the O2 compression cooling device and the H2 compression cooling device, respectively, and the O2 storage tank is connected to the air reactor, and the H2 storage tank is connected to the methanol synthesis system and the ammonia synthesis system; The low-temperature heater is connected to the high-temperature heater, and the high-temperature heater is connected to the solid oxide electrolyzer; the O2 compression cooling system, the H2 compression cooling system, the CO2 compression cooling system, and the N2 compression cooling system are connected to the low-temperature heater through a heating pipeline; the O2 cooler and the H2 cooler are connected to the high-temperature heater through a heating pipeline.

7. A method for operating a semi-off-grid wind-solar-ammonia-alcohol integrated system based on chemical chaining combustion according to any one of claims 1 to 6, characterized in that: include: The intelligent dispatching system optimizes the power and material output of the chemical chain combustion power generation system, high-temperature electrolysis hydrogen production system, methanol synthesis system and ammonia synthesis system according to the grid dispatching plan curve and wind and solar forecast data, and specifies the corresponding plan curve; The storage and discharge process of the energy storage system is used to adjust the deviation between the planned curve and the actual power in real time according to the real-time power generation of wind power and photovoltaic power. At the same time, the output of each equipment is dispatched through the intelligent dispatching system to achieve stable output of system electricity and chemical processes.

8. The method according to claim 7, characterized in that During operation, the SOC of the energy storage system is always controlled within the range of 30%-70% to ensure that the integrated system has real-time power regulation capabilities.

9. The method according to claim 8, characterized in that The electricity generated by the wind power system, photovoltaic system, and steam cycle power generation system is used for electrolysis hydrogen production and the O2 compression cooling system, H2 compression cooling system, CO2 compression cooling system, N2 compression cooling system, ammonia synthesis system, and methanol synthesis system in the integrated system. The excess electricity is sold to the power grid; the energy storage system uses ternary lithium batteries for charging and discharging, which is used to smooth out the volatility of power generation generated by the wind power system and photovoltaic system.

10. The method according to claim 8, characterized in that The air is heated to 350°C by a heating device and then enters the air reactor. In the air reactor, the air and the low-valent oxygen carrier undergo redox reactions, and the oxygen carrier increases from a low valence state to a high valence state, and releases a large amount of heat. The oxygen carrier with a higher valence state enters the fuel reactor. The air and oxygen carrier dust mixture after the reaction enters the N2 purification and cooling system. After passing through the N2 purification and cooling system, the oxygen carrier in the mixture is captured and returned to the air reactor to continue to participate in the reaction. At the same time, the air after the reaction is purified, and a small amount of impurity gas in the gas is removed and discharged, thereby obtaining high-concentration N2. The high-quality heat captured from the N2 purification and cooling system is transported to the steam cycle power generation system for generating high-quality steam; the obtained high-concentration N2 enters the N2 compression and cooling system for compression and cooling. The low-quality heat during the compression process is used for the low-temperature heating process of desalted water during the hydrogen production process, and the compressed N2 enters the N2 storage tank for storage; the purpose of controlling the N2 production is achieved by controlling the amount of O2 added to the heated air, and the oxygen produced by hydrogen production is used as a supplementary source; After water is heated to 350°C by a heating device, high-temperature steam is obtained. The high-temperature steam and coal enter the fuel reactor together, undergo redox reactions with high-valent oxygen carriers in the fuel reactor, and the oxygen carriers are reduced from high-valent to low-valent states, releasing heat. The oxygen carriers with reduced valence enter the air reactor. After water vapor reacts with coal, a high-humidity mixed gas is obtained and enters the CO2 purification and cooling system. After the CO2 purification and cooling system, the coal ash, moisture and a small amount of impurity gases in the mixed gas are captured and treated to obtain high-concentration CO2; the high-quality heat captured in the CO2 purification and cooling system is transported to the steam cycle power generation system for generating high-quality steam; the obtained high-concentration CO2 enters the CO2 compression and cooling system for compression and cooling, and the low-quality heat in the compression process is used for the low-temperature heating process of desalted water in the hydrogen production process, and the compressed N2 enters the N2 storage tank for storage; the N2 storage tank and the H2 storage tank are directly connected to the ammonia synthesis system for the synthesis of ammonia alcohol; the CO2 storage tank and the H2 storage tank are directly connected to the methanol synthesis system for the synthesis of methanol.

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