A coal gasification pure oxygen combustion power generation system

Abstract

This invention provides a coal gasification pure oxygen combustion power generation system, relating to the field of oxygen-enriched combustion supercritical carbon dioxide power cycle power generation technology. It includes a gasifier, a steam generator, a hydrogen separator, a combustion chamber, and a turbine. The syngas outlet of the gasifier is sequentially connected to the combustion chamber via a high-temperature pipeline of a high-temperature syngas regenerator, a high-temperature pipeline of a low-temperature syngas regenerator, a first cooler, and a hydrogen separator. The turbine exhaust port is sequentially connected to a second cooler via a high-temperature pipeline of a high-temperature flue gas regenerator and a high-temperature pipeline of a low-temperature flue gas regenerator. The exhaust port of the second cooler is connected to the exhaust port of the low-temperature pipeline of the low-temperature flue gas regenerator and the exhaust port of the gasifier. The exhaust port of the low-temperature pipeline of the high-temperature syngas regenerator is connected to the gasifier and the combustion chamber. This invention introduces water vapor and carbon dioxide into the gasifier for gasification, combining the flexibility of water gasification with the high efficiency of carbon dioxide gasification, and fully utilizing the heat in the system.

Description

Technical Field

[0001] This invention relates to the field of oxygen-enriched combustion supercritical carbon dioxide power cycle power generation technology, and in particular to a coal gasification pure oxygen combustion power generation system. Background Technology

[0002] Coal holds an irreplaceable and fundamental position in the energy structure and is a crucial guarantee for energy security. Coal-fired power generation is the most representative industry of coal utilization in my country, accounting for more than half of total coal consumption. It is the main power source for my country's electricity supply and a major source of greenhouse gases such as carbon dioxide. For a considerable period, coal-fired power generation will continue to play a vital role in ensuring my country's energy and power security and flexibly regulating peak demand. Against this backdrop, future coal-fired power generation will need to develop towards high efficiency, cleanliness, and low carbon emissions, while also transforming towards safety, flexibility, and multifunctionality. Traditional coal-fired power plants, constrained by factors such as combustion, heat and mass transfer, and working fluid properties, often struggle to achieve a synergy between high efficiency, low carbon emissions, and flexibility.

[0003] Oxygen-enriched combustion and direct heating of supercritical carbon dioxide power cycle is considered a promising technology for efficient zero-emission power generation using carbon-based fuels. In this cycle, carbon-containing fuel is burned with oxygen to directly heat high-pressure supercritical carbon dioxide. The resulting high-temperature, high-pressure flue gas enters a turbine to generate electricity. Since both the working fluid and combustion products are carbon dioxide, the carbon dioxide produced during combustion can be easily separated from the turbine exhaust gas without the need for complex carbon capture equipment. Furthermore, by utilizing the low power consumption of supercritical carbon dioxide compression near its critical point and employing regenerative methods, high-efficiency power generation can be achieved.

[0004] The fuel for oxygen-enriched supercritical CO2 power cycles is generally natural gas, but solid fuels such as coal can also be converted into gaseous fuels through gasification to drive the cycle. The gasification medium for coal gasification can be either steam or CO2. CO2 gasification produces syngas with low H2 content, resulting in less moisture content after combustion and less heat waste due to the latent heat of water gasification; however, the CO2 originates from within the unit, and the circulating CO2 supply may not keep pace with load changes, potentially leading to a mismatch in CO2 supply to the gasifier. Steam gasification produces high H2 content, resulting in more moisture content after combustion and greater heat waste. Furthermore, the high moisture content in the flue gas is detrimental to the operation of critical equipment such as turbines and regenerators; however, the water input comes from an external source and can be adjusted in real time according to load changes.

[0005] In coal gasification combined with oxy-fuel combustion, the syngas needs to be purified (dehydrated, desulfurized) at a relatively low temperature, requiring heat recovery. Traditional heat recovery schemes fail to utilize the significant amount of heat carried by the syngas at the gasifier outlet in a tiered and efficient manner, resulting in heat loss and reduced overall efficiency. Furthermore, to ensure high gasification efficiency, the gasification temperature is relatively high, necessitating quenching of the syngas before heat exchange. Traditional schemes use cooled, purified syngas for quenching, leading to a large difference in the flow rates of the hot and cold streams during the syngas reheating process. This makes it difficult to lower the temperature of the crude syngas, further increasing heat loss. Summary of the Invention

[0006] The purpose of this invention is to provide a coal gasification pure oxygen combustion power generation system to solve the problems existing in the prior art. It introduces water vapor and carbon dioxide into the gasifier to participate in gasification, taking into account the flexibility of water gasification and the high efficiency of carbon dioxide gasification, and making full use of the heat in the system.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] A coal gasification pure oxygen combustion power generation system includes a gasifier, a steam generator, a hydrogen separator, a combustion chamber, and a turbine. The gasifier is used to gasify coal to generate syngas, and the steam generator is used to provide gasification steam to the gasifier. The hydrogen separator is used to separate hydrogen from the syngas. The combustion chamber is used to burn the syngas. The turbine inlet is connected to the combustion chamber outlet to drive a generator to generate electricity using the high-temperature flue gas from the combustion chamber. The syngas outlet of the gasifier is connected to the syngas inlet of the hydrogen separator via a high-temperature pipeline of a high-temperature syngas regenerator, a high-temperature pipeline of a low-temperature syngas regenerator, a first cooler, and in sequence. The first hydrogen outlet of the hydrogen separator is connected to a hydrogen capture device, and the syngas outlet of the hydrogen separator is connected to a second multi-stage intercooler. The compressor and the low-temperature pipeline of the low-temperature syngas regenerator are connected to the combustion chamber; the exhaust port of the turbine is connected to the second cooler in sequence through the high-temperature pipeline of the high-temperature flue gas regenerator and the high-temperature pipeline of the low-temperature flue gas regenerator; the exhaust port of the second cooler is connected to the third multi-stage indirect cooling compressor and the fourth multi-stage indirect cooling compressor arranged in parallel; the exhaust port of the third multi-stage indirect cooling compressor is connected to the carbon dioxide capture device and the low-temperature pipeline of the low-temperature flue gas regenerator in parallel; the exhaust port of the low-temperature pipeline of the low-temperature flue gas regenerator is connected to the inlet of the low-temperature pipeline of the high-temperature syngas regenerator through the low-temperature pipeline of the high-temperature flue gas regenerator; the exhaust port of the low-temperature pipeline of the high-temperature syngas regenerator is connected to the gasifier and the combustion chamber; and the exhaust port of the fourth multi-stage indirect cooling compressor is connected to the exhaust port of the gasifier.

[0009] As one embodiment, it also includes a water electrolysis device, wherein the second hydrogen exhaust port of the water electrolysis device is used to connect to a hydrogen capture device; and the oxygen exhaust port of the water electrolysis device is connected to the gasification furnace and the combustion chamber.

[0010] As one embodiment, it also includes a hydrogen capture device, wherein the second hydrogen exhaust port is connected to the first hydrogen exhaust port through a seventh intercooled compressor, and is connected to the hydrogen capture device through a first multi-stage intercooled compressor.

[0011] As one embodiment, it also includes a fifth multi-stage intercooled compressor, the air inlet of which is connected to the oxygen exhaust port, and the exhaust port of which is connected to the gasifier and the combustion chamber.

[0012] As one embodiment, it also includes a sixth multi-stage intercooled compressor, the air inlet of which is connected to the exhaust port of the fifth multi-stage intercooled compressor, and the exhaust port of the sixth multi-stage intercooled compressor is connected to the combustion chamber.

[0013] As one embodiment, it also includes an adiabatic compressor, the air inlet of which is connected to the exhaust port of the second cooler, and the exhaust port of the adiabatic compressor is connected to the low-temperature pipeline exhaust port of the low-temperature flue gas regenerator and the low-temperature pipeline inlet of the high-temperature flue gas regenerator through a three-way connector.

[0014] As one embodiment, the exhaust port of the adiabatic compressor is also connected to the turbine, serving as the cooling flow for the turbine.

[0015] In one embodiment, the exhaust port of the gasifier is connected to the steam generator for gasifying water.

[0016] As one embodiment, the low-temperature pipeline exhaust port of the high-temperature syngas regenerator is connected to the gasifier through a throttling valve; a water separator and a sulfur separator are also connected in series between the first cooler and the hydrogen separator.

[0017] As one embodiment, it also includes a methanol synthesis unit, wherein the hydrogen capture unit and the carbon dioxide capture unit are both connected to the methanol synthesis unit and are used to supply hydrogen and carbon dioxide to the methanol synthesis unit.

[0018] The present invention has the following technical advantages over the prior art:

[0019] 1. This invention introduces steam and carbon dioxide into a gasifier for gasification, combining the flexibility of water gasification with the high efficiency of carbon dioxide gasification. While ensuring circulation efficiency, the steam flow rate can be adjusted to quickly respond to changes in unit load.

[0020] 2. This invention utilizes low-temperature circulating carbon dioxide to quench the syngas, resulting in a large mass flow rate of carbon dioxide. This overcomes the heat loss caused by excessive deviation in the mass flow rate of the hot and cold streams in traditional syngas quenching schemes, while reducing the syngas outlet temperature.

[0021] 3. This invention makes full use of carbon dioxide, with no external carbon dioxide emissions, and carbon capture requires no additional energy consumption, thus realizing the construction of a new low-carbon and high-efficiency coal-fired power generation system.

[0022] Other technical solutions of the present invention have the following technical advantages over the prior art:

[0023] In this invention, the power source for the water electrolysis device is renewable electricity. This invention combines renewable electricity-powered water electrolysis for hydrogen production with pure oxygen combustion power generation. The byproduct oxygen is applied to the coal gasification and pure oxygen combustion processes of the coal gasification pure oxygen combustion power generation system, achieving full utilization of the water electrolysis products and improving the overall efficiency of renewable electricity consumption. Therefore, this invention combines water electrolysis for hydrogen production with pure oxygen power generation, fully utilizing renewable energy to consume the byproduct oxygen in the hydrogen production process, and further synthesizing methanol from the captured carbon dioxide and hydrogen, achieving "electricity-hydrogen-methanol" cogeneration, and constructing a multi-generation system that can realize renewable energy consumption and efficient hydrogen production and carbon capture power generation.

[0024] This invention introduces a recompression modification measure in the flue gas reheating process, which a portion of the flue gas that has not been intercooled and compressed is adiabatically pressurized and directly mixed with the main circulation flow. This reduces the heat loss caused by the mismatch in heat capacity due to the large pressure difference between the hot and cold streams during the flue gas reheating process, and effectively improves the system's energy utilization efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a coal gasification pure oxygen combustion power generation system according to one embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Gasifier; 2. Steam generator; 3. High-temperature syngas regenerator; 4. Low-temperature syngas regenerator; 5. First cooler; 6. Water separator; 7. Sulfur separator; 8. Hydrogen separator; 9. First multi-stage intercooled compressor; 10. Hydrogen capture device; 11. Second multi-stage intercooled compressor; 12. Combustion chamber; 13. Turbine; 14. Generator; 15. High-temperature flue gas regenerator; 16. Low-temperature flue gas regenerator; 17. Second cooler; 18. Third multi-stage intercooled compressor; 19. Carbon dioxide capture device; 20. Pump; 21. Adiabatic compressor; 22. Fourth multi-stage intercooled compressor; 23. Throttling valve; 24. Water electrolysis device; 25. Fifth multi-stage intercooled compressor; 26. Sixth multi-stage intercooled compressor; 27. Seventh multi-stage intercooled compressor; 28. Methanol synthesis unit. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The purpose of this invention is to provide a coal gasification pure oxygen combustion power generation system to solve the problems existing in the prior art. It introduces water vapor and carbon dioxide into the gasifier to participate in gasification, taking into account the flexibility of water gasification and the high efficiency of carbon dioxide gasification, and making full use of the heat in the system.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1As shown, this embodiment provides a coal gasification pure oxygen combustion power generation system, including a gasifier 1, a steam generator 2, a hydrogen separator 8, a combustion chamber 12, and a turbine 13. The gasifier 1 is used for coal gasification to generate syngas and has a slag discharge port; the steam generator 2 is used to provide gasification steam to the gasifier 1; the hydrogen separator 8 is used to separate hydrogen from the syngas; the combustion chamber 12 is used to burn the syngas; the inlet of the turbine 13 is connected to the exhaust port of the combustion chamber 12, and the high-temperature flue gas from the combustion chamber 12 is used to drive a generator 14 to generate electricity; the syngas outlet of the gasifier 1 is connected to the syngas inlet of the hydrogen separator 8 via a high-temperature pipeline of a high-temperature syngas regenerator 3, a high-temperature pipeline of a low-temperature syngas regenerator 4, a first cooler 5, and the first hydrogen exhaust port of the hydrogen separator 8 is connected to a hydrogen capture device 10, and the syngas exhaust port of the hydrogen separator 8 is connected to the second multi-stage intercooled compressor 11, a low-temperature pipeline of the low-temperature syngas regenerator 4, and the combustion chamber 13. The combustion chamber 12 is connected; the exhaust port of the turbine 13 is connected to the second cooler 17 in sequence through the high temperature pipeline of the high temperature flue gas regenerator 15 and the high temperature pipeline of the low temperature flue gas regenerator 16. The exhaust port of the second cooler 17 is connected to the third multi-stage intercooled compressor 18 and the fourth multi-stage intercooled compressor 22, which are set in parallel. The exhaust port of the third multi-stage intercooled compressor 18 is connected to the carbon dioxide capture device 19 and the low temperature pipeline of the low temperature flue gas regenerator 16, which are set in parallel. The exhaust port of the low temperature pipeline of the low temperature flue gas regenerator 16 is connected to the low temperature pipeline inlet of the high temperature syngas regenerator 3 through the low temperature pipeline of the high temperature flue gas regenerator 15. The exhaust port of the low temperature pipeline of the high temperature syngas regenerator 3 is connected to the gasifier 1 and the combustion chamber 12. The exhaust port of the fourth multi-stage intercooled compressor 22 is connected to the exhaust port of the gasifier 1.

[0033] During operation, steam generator 2 supplies steam to gasifier 1, enabling rapid response to load adjustments and ensuring a stable supply of gasifying agent. Coal passes through gasifier 1 to generate high-temperature crude syngas. This high-temperature crude syngas recovers heat through a high-temperature synthesizer reheater and a low-temperature syngas reheater 4, then passes through a first cooler 5 to cool before entering a hydrogen separator 8 to separate hydrogen from the syngas. The dehydrogenated clean syngas is compressed by a second multi-stage intercooled compressor 11 and then enters a low-temperature syngas reheater 4 to be preheated by the crude syngas before finally entering combustion chamber 12 for combustion. The high-temperature flue gas generated after combustion in combustion chamber 12 enters turbine 13 to perform work, and turbine 13 drives a connected generator 14 to generate electricity. After performing work, the exhaust gas passes sequentially through the high-temperature flue gas regenerator 15 and the low-temperature flue gas regenerator 16 to recover heat and heat the circulating carbon dioxide. The heat-recovered flue gas is further cooled by the second cooler 17 and then divided into two streams. One stream is compressed by the fourth multi-stage intercooled compressor 22 and mixed with the high-temperature crude syngas from the gasifier 1 outlet for quenching, lowering the crude syngas temperature and ensuring the safety of subsequent heat exchange processes. The remaining flue gas is pressurized by the third multi-stage intercooled compressor 18. Part of the gas is separated and sent to the carbon dioxide capture device 19 for carbon capture, while the other part, as the main circulating carbon dioxide, is pressurized by pump 20 and sequentially passes through the low-temperature flue gas regenerator 16, the high-temperature flue gas regenerator 15, and the high-temperature syngas regenerator 3 to be preheated by the low-temperature flue gas, high-temperature flue gas, and high-temperature crude syngas. The carbon dioxide at the outlet of the high-temperature syngas regenerator 3 is divided into two streams: one enters the gasifier 1 to participate in gasification, and the other enters the combustion chamber 12 to absorb the heat from the combustion of the syngas.

[0034] Therefore, this embodiment introduces both steam and carbon dioxide into gasifier 1 for gasification, combining the flexibility of water gasification with the high efficiency of carbon dioxide gasification. While ensuring cycle efficiency, the steam flow rate can be adjusted to quickly respond to changes in unit load. Furthermore, this embodiment utilizes low-temperature circulating carbon dioxide to quench the syngas, resulting in a large carbon dioxide mass flow rate. This overcomes the heat loss caused by excessive deviations in the mass flow rates of hot and cold streams in traditional syngas quenching schemes, while lowering the syngas outlet temperature. In addition, this embodiment makes full use of carbon dioxide, with no external carbon dioxide emissions, and carbon capture requires no additional energy, thus realizing the construction of a new low-carbon, high-efficiency coal-fired power generation system.

[0035] In this embodiment, the disassembly and arrangement of the flue gas regenerator allows for flexible adjustment of the heat load of the flue gas heat exchanger, reducing thermal deviation and ensuring safe operation under varying loads.

[0036] In this embodiment, the exhaust port of the gasifier 1 is connected to the steam generator 2 for gasifying water. The syngas discharged from the steam generator 2 then enters the high-temperature syngas regenerator 3 and the low-temperature syngas regenerator 4 in sequence to exchange heat with the syngas, which can fully recover and utilize the heat of the syngas.

[0037] As one embodiment, this embodiment also includes a water electrolysis device 24. The second hydrogen exhaust port of the water electrolysis device 24 is connected to the hydrogen collection device 10; the oxygen exhaust port of the water electrolysis device 24 is connected to the gasifier 1 and the combustion chamber 12. This embodiment also includes a hydrogen collection device 10. The hydrogen discharged from the second hydrogen exhaust port passes through the seventh multi-stage intercooled compressor 27 and then converges with the hydrogen discharged from the first hydrogen exhaust port. After being compressed by the first multi-stage intercooled compressor 9, it is collected by the hydrogen collection device 10. Hydrogen is separated from the low-temperature syngas and collected together with the hydrogen byproduct of water electrolysis for oxygen production, achieving co-production of electricity and hydrogen, and avoiding safety and efficiency problems caused by excessively high hydrogen content in the syngas. Moreover, the syngas produced by water and coal gasification is the main fuel for the system's electricity production, and the hydrogen in the syngas is one of the main sources of the system's hydrogen co-production. The ratio of hydrogen to electricity production can be adjusted by adjusting the ratio of water and carbon dioxide, achieving flexible operation of the co-production of electricity and hydrogen.

[0038] In this embodiment, the power source for the water electrolysis device 24 is renewable electricity. This embodiment combines renewable electricity to electrolyze water for hydrogen production with pure oxygen combustion power generation, applying the byproduct oxygen to the coal gasification and pure oxygen combustion processes of the coal gasification pure oxygen combustion power generation system, thereby achieving full utilization of the water electrolysis products and improving the overall efficiency of renewable electricity consumption and utilization.

[0039] As one embodiment, this example also includes a methanol synthesis unit 28, which is connected to a hydrogen capture unit 10 and a carbon dioxide capture unit 19, respectively, for producing methanol using the captured hydrogen and carbon dioxide. Thus, this example combines water electrolysis for hydrogen production with pure oxygen power generation, fully utilizing renewable energy to consume oxygen, a byproduct of the hydrogen production process, and further synthesizing methanol from the captured carbon dioxide and hydrogen, achieving "electricity-hydrogen-methanol" cogeneration. This constructs a multi-generation system that realizes the consumption of renewable energy and efficient power generation through hydrogen production and carbon capture.

[0040] As one embodiment, this embodiment also includes a fifth multi-stage intercooled compressor 25, the air inlet of the fifth multi-stage intercooled compressor 25 is connected to the oxygen exhaust port, and the exhaust port of the fifth multi-stage intercooled compressor 25 is connected to the gasifier 1 and the combustion chamber 12.

[0041] As one embodiment, this embodiment also includes a sixth multi-stage intercooled compressor 26, the air inlet of the sixth multi-stage intercooled compressor 26 is connected to the exhaust port of the fifth multi-stage intercooled compressor 25, and the exhaust port of the sixth multi-stage intercooled compressor 26 is connected to the combustion chamber 12.

[0042] As one implementation, this embodiment also includes an adiabatic compressor 21. The inlet of the adiabatic compressor 21 is connected to the outlet of the second cooler 17. That is, in this embodiment, the low-temperature flue gas discharged from the second cooler 17 is divided into three streams, two of which have already been described above. After being compressed (heated and pressurized) by the adiabatic compressor 21, this flue gas is further divided into two parts. One part enters the turbine 13 as a cooling flow to ensure the safe operation of the turbine 13. The other part acts as a recompression flow and mixes with the flue gas flow from the outlet of the low-temperature pipe in the low-temperature flue gas regenerator 16. This is to match the pressure of the low-temperature flue gas after being compressed by the third multi-stage intercooled compressor 18, alleviate the heat capacity mismatch caused by the large pressure difference between the hot and cold streams, reduce the average heat exchange temperature difference in the flue gas reheating process, reduce heat loss in the reheating process, and improve the utilization rate of flue gas waste heat. This embodiment can reduce the heat exchange temperature difference in the flue gas reheating process and improve the utilization efficiency of flue gas waste heat by setting the adiabatic compressor 21.

[0043] In order to regulate the amount of carbon dioxide introduced into the gasifier 1, in this embodiment, the low-temperature pipeline exhaust port of the high-temperature synthesis gas regenerator 3 is connected to the gasifier 1 through a throttle valve 23.

[0044] In this embodiment, a water separator 6 and a sulfur separator 7 are connected in series between the first cooler 5 and the hydrogen separator 8 to improve the cleanliness of the synthesis gas entering the hydrogen separator 8.

[0045] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A coal gasification pure oxygen combustion power generation system, characterized in that, include: Gasifier, the gasifier being used for coal gasification to generate syngas; A steam generator for supplying gasification water steam to the gasifier; Hydrogen separator, used to separate hydrogen from synthesis gas; Combustion chamber, the combustion chamber being used to combust syngas; And a turbine, wherein the air inlet of the turbine is connected to the exhaust outlet of the combustion chamber, and is used to drive a generator to generate electricity using the high-temperature flue gas from the combustion chamber; The syngas outlet of the gasifier is connected to the syngas inlet of the hydrogen separator via the high-temperature pipeline of the high-temperature syngas regenerator, the high-temperature pipeline of the low-temperature syngas regenerator, the first cooler, and the high-temperature pipeline of the hydrogen separator. The first hydrogen exhaust port of the hydrogen separator is used to connect to the hydrogen capture device. The syngas exhaust port of the hydrogen separator is connected to the combustion chamber via the second multi-stage intercooled compressor and the low-temperature pipeline of the low-temperature syngas regenerator. The turbine's exhaust port is connected to the second cooler via the high-temperature pipeline of the high-temperature flue gas regenerator and the high-temperature pipeline of the low-temperature flue gas regenerator. The exhaust port of the second cooler is connected to the third and fourth multi-stage intercooled compressors, which are arranged in parallel. The exhaust port of the third multi-stage intercooled compressor is connected to the carbon dioxide capture device and the low-temperature pipeline of the low-temperature flue gas regenerator, which are arranged in parallel. The exhaust port of the low-temperature pipeline of the low-temperature flue gas regenerator is connected to the inlet of the low-temperature pipeline of the high-temperature syngas regenerator via the low-temperature pipeline of the high-temperature flue gas regenerator. The exhaust port of the low-temperature pipeline of the high-temperature syngas regenerator is connected to the gasifier and the combustion chamber. The exhaust port of the fourth multi-stage intercooled compressor is connected to the exhaust port of the gasifier. It also includes an adiabatic compressor, the air inlet of which is connected to the exhaust port of the second cooler, and the exhaust port of the adiabatic compressor is connected to the low-temperature pipeline exhaust port of the low-temperature flue gas regenerator and the low-temperature pipeline inlet of the high-temperature flue gas regenerator through a three-way connector. The exhaust port of the adiabatic compressor is also connected to the turbine, serving as a cooling flow for the turbine.

2. The coal gasification pure oxygen combustion power generation system according to claim 1, characterized in that, It also includes a water electrolysis device, wherein the second hydrogen exhaust port of the water electrolysis device is used to connect to a hydrogen capture device; and the oxygen exhaust port of the water electrolysis device is connected to the gasification furnace and the combustion chamber.

3. The coal gasification pure oxygen combustion power generation system according to claim 2, characterized in that, It also includes a hydrogen capture device, wherein the second hydrogen exhaust port is connected to the first hydrogen exhaust port through a seventh intercooled compressor, and is connected to the hydrogen capture device through a first multi-stage intercooled compressor.

4. The coal gasification pure oxygen combustion power generation system according to claim 2, characterized in that, It also includes a fifth multi-stage intercooled compressor, the air inlet of which is connected to the oxygen exhaust port, and the exhaust port of which is connected to the gasifier and the combustion chamber.

5. The coal gasification pure oxygen combustion power generation system according to claim 4, characterized in that, It also includes a sixth multi-stage intercooled compressor, the air inlet of which is connected to the exhaust port of the fifth multi-stage intercooled compressor, and the exhaust port of the sixth multi-stage intercooled compressor is connected to the combustion chamber.

6. The coal gasification pure oxygen combustion power generation system according to claim 1, characterized in that, The exhaust port of the gasifier is connected to the steam generator for gasifying water; the exhaust port of the low-temperature pipeline of the high-temperature syngas regenerator is connected to the gasifier through a throttling valve.

7. The coal gasification pure oxygen combustion power generation system according to claim 1, characterized in that, A water separator and a sulfur separator are connected in series between the first cooler and the hydrogen separator.

8. The coal gasification pure oxygen combustion power generation system according to claim 3, characterized in that, It also includes a methanol synthesis unit, wherein the hydrogen capture unit and the carbon dioxide capture unit are both connected to the methanol synthesis unit and are used to supply hydrogen and carbon dioxide to the methanol synthesis unit.

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