An IGCC power generation system and method based on SOEC co-electrolysis

Abstract

The present invention provides an IGCC power generation system and method based on SOEC co-electrolysis, which belongs to the field of CO2 capture and utilization. The IGCC power generation system includes: a coal gas purification subsystem, which purifies the coal gas gasified with water, oxygen and coal as raw materials to obtain a first synthesis gas; a generator; a gas turbine subsystem, which is connected to the coal gas purification subsystem and the generator, and is fed with oxygen, and is used to make the oxygen and the first synthesis gas burn to drive the generator to generate electricity and produce flue gas; a solid oxide co-electrolysis subsystem, which is used to provide oxygen for the coal gas purification subsystem and the gas turbine subsystem, and co-electrolyze the flue gas under the drive of new energy electricity to generate a second synthesis gas, and the second synthesis gas and part of the first synthesis gas are subjected to fuel synthesis to obtain a target fuel. The solid oxide co-electrolysis subsystem is combined with the overall coal gasification combined cycle power generation system to improve the energy conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the field of CO2 capture and utilization, and in particular to an IGCC power generation system and method based on SOEC co-electrolysis. Background Art

[0002] CO2 produced by thermal power generation is the main source of greenhouse gases. Carbon capture and utilization is the only solution that can significantly reduce carbon emissions from fossil fuels in power generation and industrial processes. Therefore, it is necessary to conduct in-depth research on carbon reduction technology for thermal power units and seek low-investment and low-operating cost integrated low-carbon technologies for carbon capture and utilization through comprehensive carbon utilization. IGCC (Integrated gasification combined cycle) power generation has the advantages of high efficiency, wide fuel adaptability, low pollutant emissions and easy integration with chemical processes. It is one of the most promising advanced coal-fired power technologies. IGCC is more energy-efficient and environmentally friendly than traditional coal-fired power generation technology. However, whether IGCC adopts decarbonization before combustion, decarbonization during combustion (pure oxygen combustion) or decarbonization after combustion, the system faces an energy efficiency penalty of 7-12 percentage points.

[0003] Therefore, it is necessary to change the existing IGCC carbon capture process, change the CO2 separation and capture method, and innovate the system process structure to improve the energy conversion efficiency of the total energy system. Summary of the invention

[0004] The object of the present invention is to provide an IGCC power generation system and method based on SOEC co-electrolysis, which can improve energy conversion efficiency.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] An IGCC power generation system based on SOEC co-electrolysis, comprising:

[0007] A coal gas purification subsystem, used for purifying coal gas gasified with water, oxygen and coal as raw materials to obtain a first synthesis gas;

[0008] dynamo;

[0009] A gas turbine subsystem connected to the coal gas purification subsystem and the generator and fed with oxygen for burning the oxygen with the first synthesis gas to drive the generator to generate electricity and flue gas;

[0010] The solid oxide co-electrolysis subsystem is respectively connected to the coal gas purification subsystem, the gas turbine subsystem and the new energy power system, and is used to provide oxygen to the coal gas purification subsystem and the gas turbine subsystem, and co-electrolyze the flue gas under the drive of new energy power to generate a second synthesis gas, and synthesize the second synthesis gas with part of the first synthesis gas to obtain the target fuel.

[0011] Optionally, the coal gas purification subsystem includes:

[0012] A gasifier connected to the solid oxide co-electrolysis subsystem, used to gasify coal with water and oxygen to obtain a raw synthesis gas;

[0013] A coal gas cooler connected to the gasifier and used to cool the raw synthesis gas to obtain cooled synthesis gas;

[0014] a dust removal unit connected to the coal gas cooler and used for removing dust from the cooled synthesis gas to obtain the dust-removed synthesis gas;

[0015] The acid gas removal unit is connected to the dust removal unit and is used to remove the acid gas in the dedusted synthesis gas to obtain the first synthesis gas.

[0016] Optionally, the acidic gas is hydrogen sulfide;

[0017] The acid gas removal unit is used to absorb hydrogen sulfide in the dedusted synthesis gas to obtain the first synthesis gas, and convert the hydrogen sulfide into sulfur.

[0018] Optionally, the gas turbine subsystem comprises:

[0019] a compressor connected to the solid oxide co-electrolysis subsystem and used to pressurize oxygen;

[0020] a combustion chamber connected to the compressor and the gas purification subsystem, and used to burn the pressurized oxygen with the first synthesis gas to obtain flue gas;

[0021] The gas turbine is connected to the combustion chamber and the generator, and is used for converting the energy of the flue gas into mechanical work to drive the generator to generate electricity and exhaust the flue gas.

[0022] Optionally, the solid oxide co-electrolysis subsystem comprises:

[0023] A solid oxide co-electrolysis anode, connected to the coal gas purification subsystem and the gas turbine subsystem, respectively, for providing oxygen to the coal gas purification subsystem and the gas turbine subsystem;

[0024] A solid oxide co-electrolysis cathode is connected to the gas turbine subsystem and the new energy power system, and is used to co-electrolyze the flue gas to generate a second synthesis gas under the drive of the new energy power;

[0025] an electrolyte disposed between the solid oxide co-electrolysis anode and the solid oxide co-electrolysis cathode;

[0026] The fuel synthesis and upgrading unit is connected to the solid oxide co-electrolysis cathode and the coal gas purification subsystem respectively, and is used to perform fuel synthesis on the second synthesis gas and part of the first synthesis gas to obtain the target fuel.

[0027] Optionally, the new energy power system is a solar power generation system, a wind power generation system, a biomass power generation system or a nuclear power generation system.

[0028] Optionally, the first synthesis gas and the second synthesis gas both include carbon monoxide and hydrogen.

[0029] Optionally, the flue gas comprises carbon dioxide and water vapor.

[0030] Optionally, the target fuel is green fuel.

[0031] To achieve the above object, the present invention also provides the following solution:

[0032] An IGCC power generation method based on SOEC co-electrolysis, comprising:

[0033] Providing oxygen to the coal gas purification subsystem and the gas turbine subsystem through the solid oxide co-electrolysis subsystem;

[0034] Water and coal are introduced into the coal gas purification subsystem, and the coal reacts with water and oxygen in the coal gas purification subsystem to generate a raw synthesis gas, and the raw synthesis gas is purified by the coal gas purification subsystem to obtain a first synthesis gas, which is then sent to the gas turbine subsystem;

[0035] The oxygen and the first synthesis gas are burned in the gas turbine subsystem to drive a generator to generate electricity and generate flue gas which is fed into the solid oxide co-electrolysis subsystem;

[0036] Driven by new energy electricity, the solid oxide co-electrolysis subsystem co-electrolyzes the flue gas to generate a second synthesis gas, and then synthesizes the second synthesis gas with part of the first synthesis gas in a fuel synthesis and upgrading unit to obtain the target fuel.

[0037] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: oxygen is provided to the coal gas purification subsystem and the gas turbine subsystem through the solid oxide co-electrolysis subsystem, the coal gas purification subsystem uses water and oxygen to gasify and purify the coal to obtain a first synthesis gas, the gas turbine subsystem causes the oxygen to burn with the first synthesis gas to drive the generator to generate electricity and produce flue gas, the solid oxide co-electrolysis subsystem, driven by new energy electricity, co-electrolyzes the flue gas to generate a second synthesis gas, and synthesizes the second synthesis gas with part of the first synthesis gas into a target fuel, and combines the solid oxide co-electrolysis subsystem with the overall coal gasification combined cycle power generation system to improve the energy conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a structural schematic diagram of an IGCC power generation system based on SOEC co-electrolysis of the present invention;

[0040] Figure 2 The figure is a flow chart of the IGCC power generation method based on SOEC co-electrolysis of the present invention.

[0041] Explanation of symbols:

[0042] 1-gasifier; 2-coal gas cooler; 3-dust removal unit; 4-acid gas removal unit; 5-compressor; 6-combustion chamber; 7-gas turbine; 8-generator; 9-solid oxide co-electrolysis anode; 10-solid oxide co-electrolysis cathode; 11-fuel synthesis upgrading unit. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The purpose of the present invention is to provide an IGCC power generation system and method based on SOEC (Solid Oxide Electrolysis Cell, high-temperature solid oxide) co-electrolysis, breaking through the traditional combined cycle concept, organically combining thermochemical, electrochemical and power cycle processes, and constructing a total energy system with multiple energy inputs, multiple outputs, and environmental compatibility.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Embodiment 1

[0047] The IGCC power generation system based on SOEC co-electrolysis of the present invention comprises: a coal gas purification subsystem, a generator, a gas turbine subsystem and a solid oxide co-electrolysis subsystem.

[0048] The coal gas purification subsystem is used to purify the coal gas obtained by gasification with water, oxygen and coal as raw materials to obtain the first synthesis gas.

[0049] Specifically, Figure 1 As shown, the coal gas purification subsystem includes: a gasifier 1, a coal gas cooler 2, a dust removal unit 3 and an acid gas removal unit 4.

[0050] The gasifier 1 is connected to the solid oxide co-electrolysis subsystem, and is used to gasify coal using water and oxygen to obtain a raw synthesis gas.

[0051] The coal gas cooler 2 is connected to the gasifier 1, and is used to cool the raw synthesis gas to obtain cooled synthesis gas.

[0052] The dust removal unit 3 is connected to the coal gas cooler 2, and is used for removing dust from the cooled synthesis gas to obtain the dust-removed synthesis gas.

[0053] The acid gas removal unit 4 is connected to the dust removal unit 3, and is used to remove acid gas from the dedusted synthesis gas to obtain the first synthesis gas. In this embodiment, the first synthesis gas includes carbon monoxide and hydrogen.

[0054] In this embodiment, the acid gas is hydrogen sulfide. The acid gas removal unit 4 absorbs the hydrogen sulfide in the dedusted synthesis gas to obtain the first synthesis gas, and converts the hydrogen sulfide into sulfur to avoid the hydrogen sulfide being discharged into the atmosphere to pollute the environment.

[0055] Specifically, coal, water and oxygen are introduced into the inlet of the gasifier 1, and the outlet of the gasifier 1 is connected to the inlet of the coal gas cooler 2. The outlet of the coal gas cooler 2 is connected to the inlet of the dust removal unit 3. The outlet of the dust removal unit 3 is connected to the inlet of the acid gas removal unit 4.

[0056] The gas turbine subsystem is connected to the coal gas purification subsystem and the generator 8, and oxygen is introduced into the gas turbine subsystem, and the gas turbine subsystem is used to burn oxygen with the first synthesis gas to drive the generator 8 to generate electricity and produce flue gas. Specifically, the flue gas includes carbon dioxide and water vapor.

[0057] Specifically, the gas turbine subsystem includes: a compressor 5 , a combustion chamber 6 and a gas turbine 7 .

[0058] The compressor 5 is connected to the solid oxide co-electrolysis subsystem, and the compressor 5 is used to pressurize the oxygen.

[0059] The combustion chamber 6 is connected to the compressor 5 and the coal gas purification subsystem, and is used to burn the pressurized oxygen and the first synthesis gas to obtain flue gas.

[0060] The gas turbine 7 is connected to the combustion chamber 6 and the generator 8. The gas turbine 7 is used to convert the energy of the flue gas into mechanical work to drive the generator 8 to generate electricity and exhaust the flue gas.

[0061] Specifically, the inlet of the combustion chamber 6 is connected to the outlet of the acid gas removal unit 4 and the outlet of the compressor 5 , the outlet of the combustion chamber 6 is connected to the inlet of the gas turbine 7 , and the outlet of the gas turbine 7 is connected to the generator 8 .

[0062] The combustion chamber 6 of the gas turbine subsystem of the present invention adopts pure oxygen combustion, replacing the energy-intensive water-gas shift and absorption-type carbon capture processes.

[0063] The solid oxide co-electrolysis subsystem is connected to the coal gas purification subsystem, the gas turbine subsystem and the new energy power system respectively. The solid oxide co-electrolysis subsystem is used to provide oxygen to the coal gas purification subsystem and the gas turbine subsystem, and co-electrolyze the flue gas under the drive of new energy power to generate a second synthesis gas, and perform fuel synthesis on the second synthesis gas and part of the first synthesis gas to obtain the target fuel. Specifically, the second synthesis gas includes carbon monoxide and hydrogen.

[0064] Specifically, the solid oxide co-electrolysis subsystem includes: a solid oxide co-electrolysis anode 9, a solid oxide co-electrolysis cathode 10, an electrolyte and a fuel synthesis upgrading unit 11.

[0065] The solid oxide co-electrolysis anode 9 is connected to the coal gas purification subsystem and the gas turbine subsystem respectively, and the solid oxide co-electrolysis anode 9 is used to provide oxygen to the coal gas purification subsystem and the gas turbine subsystem.

[0066] The solid oxide co-electrolysis cathode 10 is connected to the gas turbine subsystem and the new energy power system, and the solid oxide co-electrolysis cathode 10 is used to co-electrolyze the flue gas to generate a second synthesis gas under the drive of new energy power. Preferably, the new energy power system is a green power system such as a solar power generation system, a wind power generation system, a biomass power generation system or a nuclear power generation system.

[0067] The electrolyte is located between the solid oxide co-electrolysis anode 9 and the solid oxide co-electrolysis cathode 10 .

[0068] The fuel synthesis upgrading unit 11 is connected to the solid oxide co-electrolysis cathode 10 and the coal gas purification subsystem respectively, and the fuel synthesis upgrading unit 11 is used to perform fuel synthesis on the second synthesis gas and part of the first synthesis gas to obtain the target fuel. The target fuel is a green fuel. Specifically, it includes natural gas, methanol, dimethyl ether, aviation kerosene and other fuels.

[0069] Specifically, the outlet of the solid oxide co-electrolysis anode 9 is divided into two paths, one of which is connected to the inlet of the compressor 5, and the other is connected to the inlet of the gasifier 1. A part of the oxygen generated by the solid oxide co-electrolysis anode 9 is sent to the gasifier 1 as a gasifying agent, and the other part of the oxygen is sent to the compressor 5, and after being pressurized, it enters the combustion chamber 6 and burns with the first synthesis gas, which can avoid the presence of N2 and NO in the flue gas. x emission problems.

[0070] The inlet of the solid oxide co-electrolysis cathode 10 is connected to the outlet of the acid gas removal unit 4, the outlet of the gas turbine 7 and the new energy power system (photovoltaic / wind power), and the outlet of the solid oxide co-electrolysis cathode 10 is connected to the inlet of the fuel synthesis upgrading unit 11. Driven by the new energy power system, the solid oxide co-electrolysis cathode 10 converts the flue gas (CO2 and H2O) discharged from the gas turbine 7 into a second synthesis gas (H2 and CO), which is sent to the fuel synthesis upgrading unit 11, and further synthesized with part of the first synthesis gas discharged from the acid gas removal unit 4 to form a stable green fuel (methanol, dimethyl ether, aviation kerosene, etc.), thereby realizing the high-value utilization of the IGCC system emissions (CO2 and H2O) in the system.

[0071] New energy power systems are mostly solar photovoltaic and wind power, which are accompanied by strong volatility and intermittency. Through the solid oxide co-electrolysis process coupled with the stable IGCC system, new energy electricity can be converted into stable green fuel, realizing the high-value utilization of CO2 enabled by new energy and the large-scale, long-term storage of new energy electricity.

[0072] Part of the first synthesis gas output by the acid gas removal unit 4 enters the combustion chamber 6 for combustion, and part of the first synthesis gas can be sent to the fuel synthesis and upgrading unit 11 for further synthesis of green fuel according to the load conditions, which has the ability of flexible peak regulation.

[0073] In this embodiment, the operating temperature of the solid oxide co-electrolysis cathode 10 is between the operating temperature of the gasifier 1 and the exhaust temperature of the gas turbine 7. From the perspective of cascade utilization of energy, the integration of the two can effectively reduce the high temperature of the IGCC system. damage.

[0074] The oxygen produced by the solid oxide co-electrolysis subsystem used in the present invention can meet the oxygen supply requirements of the gasifier 1 and the gas turbine combustion chamber 6, replacing the energy-intensive air separation system.

[0075] The present invention couples the IGCC system with a high-temperature solid oxide co-electrolysis subsystem driven by new energy electricity, which can realize the synergy between IGCC and non-fossil energy, replace energy-intensive air separation, water-gas shift and absorption carbon capture processes, and use new energy electricity to enable high-value utilization of CO2, break through the huge energy efficiency penalty of IGCC carbon capture, and synergistically consider the resource utilization of CO2. The system has the "power-fuel" co-production characteristics of multiple energy inputs and multiple product outputs, and has significant flexible peak-shaving capabilities.

[0076] Embodiment 2

[0077] like Figure 2 As shown, the IGCC power generation method based on SOEC co-electrolysis provided in this embodiment includes:

[0078] S1: Providing oxygen to the coal gas purification subsystem and the gas turbine subsystem through the solid oxide co-electrolysis subsystem.

[0079] S2: Water and coal are introduced into the coal gas purification subsystem, and the coal undergoes gasification reaction with water and oxygen in the coal gas purification subsystem to generate a raw synthesis gas, which is then purified by the coal gas purification subsystem to obtain a first synthesis gas, which is then sent to the gas turbine subsystem.

[0080] Specifically, coal is fed into the gasifier after pretreatment, and water is fed into the gasifier as a raw material for the gasification reaction. The coal reacts with water and oxygen generated by the solid oxide co-electrolysis anode in the gasifier to generate a crude synthesis gas. The crude synthesis gas is heat exchanged (cooled and waste heat is recovered) by the coal gas cooler, and then passes through the dust removal unit and the acid gas removal unit in sequence to obtain the first synthesis gas (i.e., the coal gas after purification). The main components of the first synthesis gas are CO and H2. The first synthesis gas is fed into the combustion chamber.

[0081] S3: Oxygen and the first synthesis gas are burned in the gas turbine subsystem to drive a generator to generate electricity and produce flue gas, which is fed into the solid oxide co-electrolysis subsystem.

[0082] Specifically, the inlet of the compressor is connected to the pure oxygen at the outlet of the solid oxide co-electrolysis anode, and the high-pressure oxygen generated at the outlet of the compressor is sent to the combustion chamber. After the oxygen and the first synthesis gas are burned in the combustion chamber, they enter the gas turbine to generate electricity and produce flue gas (CO2 / H2O).

[0083] S4: Driven by renewable energy electricity, the solid oxide co-electrolysis subsystem co-electrolyzes the flue gas to generate a second synthesis gas, and then uses the second synthesis gas and part of the first synthesis gas to perform fuel synthesis in the fuel synthesis and upgrading unit to obtain the target fuel.

[0084] That is, as needed, a portion of the first synthesis gas and the second synthesis gas at the outlet of the solid oxide co-electrolysis cathode can be mixed and sent to the inlet of the fuel synthesis upgrading unit to improve the operating flexibility of the gas turbine.

[0085] Specifically, the higher temperature flue gas (CO2 and H2O) at the outlet of the gas turbine is connected to the inlet of the solid oxide co-electrolysis cathode, and the solid oxide co-electrolysis cathode is driven by new energy electricity (photovoltaic / wind power) to generate a second synthesis gas (H2 and CO). The second synthesis gas is sent to the fuel synthesis and upgrading unit to further synthesize green fuel with part of the first synthesis gas.

[0086] Furthermore, the IGCC power generation method based on SOEC co-electrolysis of the present invention also includes:

[0087] The waste heat from the coal gas cooler, solid oxide co-electrolysis anode, solid oxide co-electrolysis cathode and fuel synthesis upgrading unit is recycled. Part of the waste heat is used to heat the exhaust gas (exhaust flue gas) of the gas turbine. The exhaust temperature of the gas turbine is greater than 600°C, and it is necessary to increase the exhaust temperature of the gas turbine to above 700°C to reach the temperature required for the solid oxide co-electrolysis cathode reaction, which reflects the cascade utilization of energy and effectively reduces the high temperature of the IGCC system. The remaining waste heat is integrated into the steam Rankine cycle through the heat exchange network to perform work, thus maximizing the utilization of waste heat.

[0088] The present invention utilizes electrochemical conversion technology driven by new energy electricity to reuse the terminal emissions CO2 and H2O in the IGCC production process and realize green fuel co-production, thereby achieving CO2 separation and resource utilization, and maintaining a high efficiency of the IGCC system.

[0089] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0090] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An IGCC power generation system based on SOEC co-electrolysis, characterized in that: The IGCC power generation system based on SOEC co-electrolysis comprises: A coal gas purification subsystem, used for purifying coal gas gasified with water, oxygen and coal as raw materials to obtain a first synthesis gas; dynamo; a gas turbine subsystem connected to the coal gas purification subsystem and the generator and fed with oxygen, for burning the oxygen with the first synthesis gas to drive the generator to generate electricity and flue gas; A solid oxide co-electrolysis subsystem is connected to the coal gas purification subsystem, the gas turbine subsystem and the new energy power system respectively, and is used to provide oxygen to the coal gas purification subsystem and the gas turbine subsystem, and co-electrolyze the flue gas under the drive of new energy power to generate a second synthesis gas, and perform fuel synthesis on the second synthesis gas and part of the first synthesis gas to obtain a target fuel; The solid oxide co-electrolysis subsystem comprises: A solid oxide co-electrolysis anode, connected to the coal gas purification subsystem and the gas turbine subsystem, respectively, for providing oxygen to the coal gas purification subsystem and the gas turbine subsystem; A solid oxide co-electrolysis cathode is connected to the gas turbine subsystem and the new energy power system, and is used to co-electrolyze the flue gas to generate a second synthesis gas under the drive of the new energy power; an electrolyte disposed between the solid oxide co-electrolysis anode and the solid oxide co-electrolysis cathode; The fuel synthesis and upgrading unit is connected to the solid oxide co-electrolysis cathode and the coal gas purification subsystem respectively, and is used to perform fuel synthesis on the second synthesis gas and part of the first synthesis gas to obtain the target fuel.

2. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The gas purification subsystem comprises: A gasifier connected to the solid oxide co-electrolysis subsystem, used to gasify coal with water and oxygen to obtain a raw synthesis gas; A coal gas cooler connected to the gasifier and used to cool the raw synthesis gas to obtain cooled synthesis gas; a dust removal unit connected to the coal gas cooler and used for removing dust from the cooled synthesis gas to obtain the dust-removed synthesis gas; The acid gas removal unit is connected to the dust removal unit and is used to remove the acid gas in the dedusted synthesis gas to obtain the first synthesis gas.

3. The IGCC power generation system based on SOEC co-electrolysis according to claim 2, characterized in that: The acid gas is hydrogen sulfide; The acid gas removal unit is used to absorb hydrogen sulfide in the dedusted synthesis gas to obtain the first synthesis gas, and convert the hydrogen sulfide into sulfur.

4. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The gas turbine subsystem includes: a compressor connected to the solid oxide co-electrolysis subsystem and used to pressurize oxygen; a combustion chamber connected to the compressor and the gas purification subsystem, and used to burn the pressurized oxygen with the first synthesis gas to obtain flue gas; The gas turbine is connected to the combustion chamber and the generator, and is used for converting the energy of the flue gas into mechanical work to drive the generator to generate electricity and exhaust the flue gas.

5. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The new energy power system is a solar power generation system, a wind power generation system, a biomass power generation system or a nuclear power generation system.

6. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The first synthesis gas and the second synthesis gas both include carbon monoxide and hydrogen.

7. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The flue gas includes carbon dioxide and water vapor.

8. The IGCC power generation system based on SOEC co-electrolysis according to claim 1, characterized in that: The target fuel is green fuel.

9. An IGCC power generation method based on SOEC co-electrolysis, using the IGCC power generation system based on SOEC co-electrolysis according to any one of claims 1 to 8, characterized in that: The IGCC power generation method based on SOEC co-electrolysis comprises: Providing oxygen to the coal gas purification subsystem and the gas turbine subsystem through the solid oxide co-electrolysis subsystem; Water and coal are introduced into the coal gas purification subsystem, and the coal reacts with water and oxygen in the coal gas purification subsystem to generate a raw synthesis gas, and the raw synthesis gas is purified by the coal gas purification subsystem to obtain a first synthesis gas, which is then sent to the gas turbine subsystem; The oxygen and the first synthesis gas are burned in the gas turbine subsystem to drive a generator to generate electricity and generate flue gas which is fed into the solid oxide co-electrolysis subsystem; Driven by new energy electricity, the solid oxide co-electrolysis subsystem co-electrolyzes the flue gas to generate a second synthesis gas, and then synthesizes the second synthesis gas with part of the first synthesis gas in a fuel synthesis and upgrading unit to obtain the target fuel.

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