An IGCC power plant coupled liquefaction air separation equipment system and its working method

Abstract

The present invention discloses an IGCC power plant coupled liquefied air separation equipment system and a working method thereof, comprising a gasifier, a waste heat boiler, a dust removal and desulfurization purification unit, a gas turbine and a waste heat boiler connected in sequence, wherein the oxygen inlet of the gasifier is connected to a liquefied air separation device, the liquefied air separation device is powered by a power grid, the liquid oxygen outlet of the liquefied air separation device is connected to a liquid oxygen storage tank, the outlet of the liquid oxygen storage tank is connected to a liquid oxygen evaporation expansion unit, the liquid oxygen evaporation expansion unit is used to evaporate liquid oxygen to generate oxygen and expand to do work, and the oxygen outlet of the liquid oxygen evaporation expansion unit is connected to the oxygen inlet of the gasifier. The present invention can quickly and flexibly change the characteristics of power supply power and load through the liquid oxygen storage tank and the liquid oxygen evaporation expansion unit, so as to meet the peak-shaving and frequency-modulating load requirements of the power grid for the IGCC power plant.

Description

Technical Field

[0001] The invention belongs to the technical field of IGCC power generation, and in particular to an IGCC power plant coupled liquefaction air separation equipment system and a working method thereof. Background Art

[0002] Global climate issues are increasingly attracting people's attention. The "low-carbon economy" characterized by low energy consumption, low emissions and low pollution has become a hot spot in global political and economic games. The power supply in many regions is mainly coal-fired power. In order to reduce coal smoke pollution, vigorously developing coal-fired technology is a research direction to improve coal use efficiency, reduce pollution and be economically feasible. IGCC power generation technology has both the high efficiency of combined cycle and solves the environmental pollution problem caused by coal-fired power generation.

[0003] IGCC is a clean coal power generation technology that organically integrates coal gasification and gas-steam combined cycle systems. In the IGCC system, coal is gasified into medium-low calorific value coal gas. After purification, the impurities such as sulfides, nitrides, and dust contained in the coal gas are removed to become clean gas fuel, which is then sent to the gas turbine and burned in the combustion chamber. After the coal gas is burned, it drives the gas turbine to generate power, and the steam generated by the high-temperature exhaust gas in the waste heat boiler drives the steam turbine to generate power.

[0004] When the IGCC generator set is operating under variable load conditions, the system will be restricted by the safe and stable operation capabilities of equipment such as the gasification unit and the air separation unit. In particular, the variable load capacity of the existing air separation unit is very limited, resulting in the IGCC generator set being unable to respond to the grid's peak-shaving and frequency-regulating auxiliary service requirements. The peak-shaving depth and response rate cannot meet the grid's requirements, and the frequency regulation response rate and depth are very limited. Therefore, it is urgent to find a technology that can increase the variable load adaptability of IGCC power plants and units. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an IGCC power plant coupled liquefied air separation equipment system and a working method thereof, which solves the problem that the air separation unit units of the current IGCC power plant have limited load capacity and the frequency and peak regulation cannot meet the requirements of the power grid.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: comprising a liquefied air separation unit and a gasifier, a waste heat boiler, a dust removal and desulfurization purification unit, a gas turbine and a waste heat boiler connected in sequence, the oxygen outlet of the liquefied air separation unit is connected to the gasifier, the liquefied air separation unit is powered by a power grid, the liquid oxygen outlet of the liquefied air separation unit is connected to a liquid oxygen storage tank, the outlet of the liquid oxygen storage tank is connected to a liquid oxygen evaporation expansion unit, the liquid oxygen evaporation expansion unit is used to evaporate liquid oxygen to generate oxygen and expand to do work, and the oxygen outlet of the liquid oxygen evaporation expansion unit is connected to the oxygen inlet of the gasifier.

[0007] Furthermore, the liquid oxygen evaporation expansion unit is connected to a liquid oxygen generator, which is used to convert the mechanical energy of the liquid oxygen evaporation expansion unit into electrical energy, and the power output end of the liquid oxygen generator is connected to a power grid.

[0008] Furthermore, it also includes a peak-shaving and frequency-modulation control module, which is electrically connected to the liquefied air separation unit, and is used to adjust the electrical load power input to the liquefied air separation unit; the peak-shaving and frequency-modulation control module is also connected to the pipeline between the oxygen outlet of the liquefied air separation unit and the gasifier, and is also used to control the oxygen flow rate output from the liquefied air separation unit to the gasifier;

[0009] The peak-shaving and frequency-modulating control module is also connected to the pipeline between the liquefied air separation device and the liquid oxygen storage tank, and the peak-shaving and frequency-modulating control module is also used to adjust the flow rate input into the liquid oxygen storage tank;

[0010] The peak-shaving and frequency-modulating control module is also connected to the pipeline between the liquid oxygen storage tank and the liquid oxygen evaporation expansion unit, and the peak-shaving and frequency-modulating control module is also used to adjust the liquid oxygen flow rate input to the liquid oxygen evaporation expansion unit; the peak-shaving and frequency-modulating control module is also connected to the pipeline between the oxygen outlet of the liquid oxygen evaporation expansion unit and the gasifier, and the peak-shaving and frequency-modulating control module is also used to adjust the oxygen output flow rate of the liquid oxygen evaporation expansion unit;

[0011] The peak-shaving and frequency-regulating control module is also electrically connected to the liquid oxygen generator, and the peak-shaving and frequency-regulating control module is used to adjust the power generation power of the liquid oxygen generator.

[0012] Furthermore, the power output end of the liquid oxygen generator is also connected to the power input end of the peak-shaving and frequency-regulating control module, and the power output end of the gasifier is also connected to the power input end of the peak-shaving and frequency-regulating control module.

[0013] Furthermore, the gas turbine is also connected to a gas generator, and the power output end of the gas generator is connected to the power grid;

[0014] The waste heat boiler is also connected to a steam generator, and the power output end of the steam generator is connected to the power grid.

[0015] Furthermore, the steam outlet of the waste heat boiler is connected to the steam inlet of the waste heat boiler, and the flue gas waste heat outlet of the waste heat boiler is connected to the flue gas waste heat inlet of the liquid oxygen evaporation expansion unit.

[0016] Furthermore, the flue gas wastewater waste heat outlet of the dust removal and desulfurization purification unit is connected to the liquid oxygen evaporation expansion unit.

[0017] Furthermore, the liquid oxygen storage tank includes a packed bed storage tank or a fixed bed storage tank.

[0018] Furthermore, the nitrogen outlet of the liquefied air separation unit is connected to a nitrogen storage tank, and the nitrogen outlet of the liquefied air separation unit is also connected to a nitrogen inlet of a gas turbine.

[0019] The present invention also provides a working method of an IGCC power plant coupled liquefaction air separation equipment system, comprising the following steps:

[0020] When the power grid requires the IGCC power plant to reduce load, peak and frequency, that is, the grid power P 上 Need to reduce ΔP 上 When the liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit and the power generation power of the liquid oxygen generator connected to the liquid oxygen evaporation expansion unit are reduced, the sum of the reduced liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit and the power generation power of the liquid oxygen generator is ΔP 液氧 At the same time, the liquid oxygen flow rate entering the liquid oxygen storage tank is increased, and the oxygen flow rate sent to the gasifier is reduced, so that the total output power of the IGCC power plant is reduced by ΔP IGCC , the following equation must be satisfied:

[0021] ΔP 上 =ΔP 液氧 +ΔP IGCC

[0022] The values ​​of each change in electric quantity in the formula are all absolute values;

[0023] When the power grid requires the IGCC power plant to increase load, peak and frequency regulation, that is, the grid power P 上 Need to increase ΔP 上 When the liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit and the power generation power of the liquid oxygen generator connected to the liquid oxygen evaporation expansion unit are increased, the sum of the increased liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit and the power generation power of the liquid oxygen generator is ΔP 液氧 The evaporated and expanded oxygen is sent to the gasifier, which increases the total output power of the IGCC power plant by ΔP IGCC ; At the same time, reduce the liquid oxygen flow rate entering the liquid oxygen storage tank and increase the oxygen flow rate sent to the gasifier to satisfy the following equation:

[0024] ΔP 上 =ΔP 液氧 +ΔP IGCC

[0025] The values ​​of each change in electrical quantity in the formula are all absolute values.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The present invention provides an IGCC power plant coupled liquefied air separation equipment system, wherein the liquefied air separation device is connected to the oxygen inlet of the gasifier, and the liquid oxygen outlet of the liquefied air separation device is connected to the liquid oxygen storage tank. The liquefied air separation device can increase the flow rate when the power consumption is low or the power is surplus, so as to store the liquid oxygen, and can reduce the liquid oxygen flow rate when the power consumption is peak, so as to ensure the stable operation of the liquefied air separation device and the gasifier; the liquid oxygen outlet of the liquid oxygen storage tank is connected to the liquid oxygen evaporation expansion unit, so as to evaporate the liquid oxygen stored in the liquid oxygen storage tank to generate oxygen, and input the oxygen into the gasifier, so as to improve the gasifier Output, thereby providing additional peak-shaving and frequency-regulating power in addition to liquid oxygen evaporation and expansion power generation, reducing the oxygen flow rate when electricity consumption is low or when there is excess electricity, and increasing the oxygen flow rate when electricity consumption is peak. The liquid oxygen storage tank and liquid oxygen evaporation and expansion unit solve the variable load capacity limitations of the air separation unit of the current IGCC power plant, so that the liquefied air separation unit can maintain a relatively high power operation for a long time, effectively improving its efficiency. In addition, the liquid oxygen storage tank and liquid oxygen evaporation and expansion unit can quickly and flexibly change the characteristics of the power supply power and load to meet the peak-shaving and frequency-regulating load requirements of the power grid for the IGCC power plant.

[0028] Furthermore, the liquid oxygen evaporator-expander unit evaporates liquid oxygen, pressurizes and expands it to do work, and the liquid oxygen generator converts the mechanical energy of the expansion work of the liquid oxygen evaporator-expander into electrical energy. The liquid oxygen evaporator-expander unit and the liquid oxygen generator reduce power during low electricity consumption or surplus electricity, and increase power during peak electricity consumption, thereby increasing the variable load capacity of the IGCC power station.

[0029] Furthermore, the peak-shaving and frequency-regulating control module is a short-term rapid response peak-shaving and frequency-regulating service. Through the peak-shaving and frequency-regulating control module, the electric power of the liquefied air separation unit and the oxygen flow rate output by the liquefied air separation unit, the liquid oxygen input flow rate of the liquid oxygen storage tank, the liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit, the oxygen output flow rate of the liquid oxygen expansion unit and the power generation power of the liquid oxygen generator can be adjusted. Through the peak-shaving and frequency-regulating control module, the liquid oxygen sent from the liquefied air separation unit to the liquid oxygen storage tank can be increased in the case of low power consumption or power surplus, and reduced in the case of peak power consumption; the oxygen flow rate sent from the liquefied air separation unit to the gasifier can be reduced in the case of low power consumption or power surplus, and increased in the case of peak power consumption. The liquid oxygen evaporation expansion unit and the liquid oxygen generator can reduce the power generation power in the case of low power consumption or power surplus, and increase the power generation power in the case of peak power consumption; the oxygen flow rate sent from the liquid oxygen evaporation expansion unit to the gasifier can be reduced in the case of low power consumption or power surplus, and increased in the case of peak power consumption.

[0030] Furthermore, the power output end of the liquid oxygen generator is also connected to the power input end of the peak-shaving and frequency-regulating control module, and the power output end of the gasifier is also connected to the power input end of the peak-shaving and frequency-regulating control module, which fully utilizes the work of the liquid oxygen generator and achieves full utilization of energy.

[0031] Furthermore, gas-fired generators and steam generators utilize low-grade waste heat from IGCC power plants to improve resource utilization.

[0032] Furthermore, the steam of the waste heat boiler is input into the waste heat boiler, and the waste heat of the flue gas in the waste heat boiler is used as driving energy in the liquid oxygen evaporation expansion unit, thereby making full use of energy.

[0033] Furthermore, the liquid oxygen storage tank has a small capacity and does not occupy too much land in the park. In addition, the nitrogen output from the liquefied air separation unit can be stored in a nitrogen storage tank and sold, and can also be input into the gas turbine as fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0035] Figure 2 is a schematic structural diagram of another embodiment of the system of the present invention;

[0036] In the attached figure: 1-coal pretreatment unit, 2-gasification furnace, 3-waste heat boiler, 4-dust removal and desulfurization purification unit, 5-gas turbine, 6-waste heat boiler, 7-gas generator, 8-steam generator, 9-liquefied air separation unit, 10-liquid oxygen storage tank, 11-liquid oxygen evaporation expansion unit, 12-liquid oxygen generator. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, the present invention provides an IGCC power plant coupled liquefied air separation equipment system, comprising a gasifier 2, a waste heat boiler 3, a dust removal and desulfurization purification unit 4, a gas turbine 5 and a waste heat boiler 6 connected in sequence, coal enters the gasifier 2 through a coal pretreatment unit 1 for combustion, and after dust removal and desulfurization, the gas turbine is connected to a gas generator 7, and the waste heat boiler 6 is connected to a steam generator 8. The power output of the gas generator 7 and the steam generator 8 is connected to the power grid, and the power grid also supplies power to the liquefied air separation device 9. The liquefied air separation device 9 is a device that uses a cryogenic liquefaction method to separate air components. The oxygen outlet of the liquefied air separation device 9 is connected to the gasifier 2 to provide a combustion medium for the gasifier 2;

[0039] In the present embodiment, the liquid oxygen outlet of the distillation tower in the liquefied air separation device 9 is connected to the liquid oxygen storage tank 10, which refers to a tank for storing liquid oxygen. In the present embodiment, the form of the liquid oxygen storage tank 10 includes but is not limited to a packed bed type, a fixed bed type, and the like. The liquid oxygen storage tank 10 responds to the peak-shaving and frequency-regulating load of the power grid, collects subsidies or service fees for the peak-shaving and frequency-regulating auxiliary services of the power grid, and increases the operating efficiency of the IGCC power plant. The liquid oxygen outlet of the liquid oxygen storage tank 10 is connected to a liquid oxygen evaporation expansion unit 11, which refers to a device for evaporating and pressurizing liquid oxygen to produce oxygen and expanding to do work. The liquid oxygen evaporation expansion unit 11 is connected to a liquid oxygen generator 12, which is a device for converting the mechanical energy of liquid oxygen into electrical energy. The power output end of the liquid oxygen generator 12 is connected to the power grid, wherein the liquid oxygen evaporation expansion unit 11 is connected to the gasifier 2 through a pipeline after evaporation and expansion, so that the oxygen of the liquid oxygen evaporation expansion unit 11 is transported to the gasifier 2;

[0040] In this embodiment, part of the liquid oxygen separated by rectification in the liquefied air separation unit 9 is directly sent to the gasifier 2 to participate in the coal gasification reaction, and part is sent to the liquid oxygen storage tank 10;

[0041] In this embodiment, a peak-shaving and frequency-regulating control module is also included. The peak-shaving and frequency-regulating control module is a short-term rapid response peak-shaving and frequency-regulating service. The peak-shaving and frequency-regulating control module controls the increase or decrease of the electric load power delivered by the generator to the liquefied air separation device 9 and the increase or decrease of the power generated by the liquid oxygen generator 12, thereby responding to the peak-shaving and frequency-regulating load demand of the power grid for the IGCC power station;

[0042] Specifically, the peak-shaving and frequency-modulating control module is electrically connected to the liquefied air separation device 9, and the peak-shaving and frequency-modulating control module is used to adjust the electric load power input to the liquefied air separation device 9; the peak-shaving and frequency-modulating control module is also connected to the pipeline between the oxygen outlet of the liquefied air separation device 9 and the gasifier 2, and the peak-shaving and frequency-modulating control module is also used to control the oxygen flow rate output by the liquefied air separation device 9;

[0043] The peak-shaving and frequency-modulating control module is also connected to the pipeline between the liquefied air separation device 9 and the liquid oxygen storage tank 10. The peak-shaving and frequency-modulating control module is also used to adjust the flow rate input into the liquid oxygen storage tank 10. The liquid oxygen flow rate entering the liquid oxygen storage tank 10 is adjusted by the peak-shaving and frequency-modulating control module, and the minimum flow rate is 0;

[0044] The peak-shaving and frequency-modulating control module is also connected to the pipeline between the liquid oxygen storage tank 10 and the liquid oxygen evaporation expansion unit 11, and the peak-shaving and frequency-modulating control module is also used to adjust the liquid oxygen flow rate input into the liquid oxygen evaporation expansion unit 11, and the liquid oxygen flow rate is sent to the liquid oxygen evaporation expansion unit 11 through the peak-shaving and frequency-modulating control module, and the minimum value of the flow rate is 0; the peak-shaving and frequency-modulating control module is also connected to the pipeline between the oxygen outlet of the liquid oxygen evaporation expansion unit 11 and the gasifier 2, and the peak-shaving and frequency-modulating control module is also used to adjust the oxygen output flow rate of the liquid oxygen evaporation expansion unit 11;

[0045] The peak-shaving and frequency-regulating control module is also electrically connected to the liquid oxygen generator 12 , and the peak-shaving and frequency-regulating control module is used to regulate the power generation of the liquid oxygen generator 12 .

[0046] In this embodiment, during the process of evaporation and expansion of liquid oxygen, the low-grade waste heat of the IGCC power plant can be fully utilized. Specifically, the liquid oxygen evaporation and expansion unit 11 utilizes a large amount of low-grade heat including waste heat of waste water generated in the dust removal and desulfurization purification process of the IGCC power plant and waste heat of flue gas discharged from the waste heat boiler 6, so as to evaporate and expand the liquid oxygen, thereby driving the liquid oxygen generator to generate electricity; and the steam in the waste heat boiler can be input into the waste heat boiler for utilization; Figure 2 As shown, in another embodiment of the present invention, the liquid oxygen evaporation expansion unit only inputs waste heat from the IGCC power plant.

[0047] In this embodiment, the nitrogen outlet of the liquefied air separation unit 9 is connected to a nitrogen storage tank for external sales, and the nitrogen outlet can be connected to a branch line to the gas turbine as fuel for the gas turbine;

[0048] In this embodiment, the liquid oxygen evaporation expansion unit 11 works to drive the liquid oxygen generator to provide a part of the peak-shaving and frequency-modulating electricity; the oxygen after evaporation and expansion is sent to the gasifier to increase the output of the gasifier, thereby providing another part of the peak-shaving and frequency-modulating electricity.

[0049] An IGCC power plant coupled liquefied air separation equipment system provided by the present invention can improve the variable load capacity of the liquefied air separation unit. Specifically, the liquid oxygen sent from the liquefied air separation unit 9 to the liquid oxygen storage tank 10 is increased in flow rate when the power consumption is low or the power is in excess, and is decreased in flow rate when the power consumption is peak; the oxygen flow sent from the liquefied air separation unit 9 to the gasifier 2 is decreased in flow rate when the power consumption is low or the power is in excess, and is increased in flow rate when the power consumption is peak; the liquid oxygen evaporation expansion unit 11 and the liquid oxygen generator 12 are decreased in power when the power consumption is low or the power is in excess, and are increased in power when the power consumption is peak; the oxygen flow sent from the liquid oxygen evaporation expansion unit 11 to the gasifier 2 is decreased in flow rate when the power consumption is low or the power is in excess, and is increased in flow rate when the power consumption is peak.

[0050] The present invention also provides a working method of an IGCC power plant coupled liquefaction air separation equipment system, comprising the following steps:

[0051] When the power grid requires IGCC power plants or power plants to reduce load, peak and frequency, that is, the amount of power on the grid P 上 Need to reduce ΔP 上 When the peak-shaving and frequency-regulating control module is used to reduce the power generation of the liquid oxygen evaporation expansion unit 11 and the generator, the power generation of the liquid oxygen evaporation expansion unit 11 and the generator is reduced to reduce ΔP 液氧 At the same time, increase the liquid oxygen flow rate entering the liquid oxygen storage tank 10 and reduce the oxygen flow rate sent to the gasifier 2 to reduce the output of the gasifier, thereby reducing the total output power of the IGCC power plant by ΔP IGCC Finally, the changes in the above electrical quantities satisfy the following equation:

[0052] ΔP 上 =ΔP 液氧 +ΔP IGCC

[0053] The values ​​of each change in electrical quantity in the formula are all absolute values, that is, positive numbers.

[0054] In this case, the liquid oxygen flow rate entering the liquid oxygen storage tank 10 increases, and the liquid oxygen flow rate flowing from the liquid oxygen storage tank 10 to the liquid oxygen evaporation expansion unit 11 decreases. The former is greater than the latter, and the storage capacity in the liquid oxygen storage tank increases.

[0055] When the power grid requires IGCC power plants to increase load, peak and frequency regulation, that is, the amount of power on the grid P 上 Need to increase ΔP 上 When the peak-shaving and frequency-regulating control module is used to increase the power generation of the liquid oxygen evaporation expansion unit 11 and the generator, the power generation of the liquid oxygen evaporation expansion unit 11 and the generator is increased by ΔP 液氧 The evaporated and expanded oxygen is sent to gasifier 2 to increase the output of gasifier 2, thereby increasing the total output power of the IGCC power plant by ΔP IGCC ; At the same time, reduce the liquid oxygen flow rate entering the liquid oxygen storage tank and increase the oxygen flow rate sent to the gasifier. Finally, the changes in the above electrical quantities satisfy the following equation:

[0056] ΔP 上 =ΔP 液氧 +ΔP IGCC

[0057] The values ​​of each change in electrical quantity in the formula are all absolute values, that is, positive numbers.

[0058] In this case, the liquid oxygen flow rate entering the liquid oxygen storage tank decreases, and the liquid oxygen flow rate flowing from the liquid oxygen storage tank to the liquid oxygen evaporation expansion unit increases. The former is smaller than the latter, and the storage amount in the liquid oxygen storage tank decreases.

[0059] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope described in the claims.

Claims

1. A working method of an IGCC power plant coupled liquefaction air separation plant system, characterized in that: The following steps are involved: When the power grid requires the IGCC power plant to reduce load, peak and frequency, that is, the grid power P 上 Need to reduce ΔP 上 When the liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit (11) and the power generation power of the liquid oxygen generator (12) connected to the liquid oxygen evaporation expansion unit (11) are reduced, the sum of the reduced liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit (11) and the power generation power of the liquid oxygen generator (12) is ΔP 液氧 At the same time, the liquid oxygen flow rate entering the liquid oxygen storage tank (10) is increased, and the oxygen flow rate sent to the gasifier (2) is reduced, so that the total output power of the IGCC power plant is reduced by ΔP IGCC , the following equation must be satisfied: ΔP 上 =ΔP 液氧 +ΔP IGCC The values ​​of each change in electric quantity in the formula are all absolute values; When the power grid requires the IGCC power plant to increase load, peak and frequency regulation, that is, the grid power P 上 Need to increase ΔP 上 When the liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit (11) and the power generation power of the liquid oxygen generator (12) connected to the liquid oxygen evaporation expansion unit (11) are increased, the sum of the increased liquid oxygen input flow rate of the liquid oxygen evaporation expansion unit (11) and the power generation power of the liquid oxygen generator (12) is ΔP 液氧 The evaporated and expanded oxygen is sent to the gasifier, which increases the total output power of the IGCC power plant by ΔP IGCC ; At the same time, reduce the liquid oxygen flow rate entering the liquid oxygen storage tank and increase the oxygen flow rate sent to the gasifier to satisfy the following equation: ΔP 上 =ΔP 液氧 +ΔP IGCC The values ​​of each change in electric quantity in the formula are all absolute values; The IGCC power plant coupled liquefied air separation equipment system comprises a liquefied air separation unit and a gasifier (2), a waste heat boiler (3), a dust removal and desulfurization purification unit (4), a gas turbine (5) and a waste heat boiler (6) connected in sequence, the oxygen outlet of the liquefied air separation unit (9) being connected to the gasifier (2), the liquefied air separation unit (9) being powered by a power grid, the liquid oxygen outlet of the liquefied air separation unit (9) being connected to a liquid oxygen storage tank (10), the outlet of the liquid oxygen storage tank (10) being connected to a liquid oxygen evaporation expansion unit (11), the liquid oxygen evaporation expansion unit (11) being used to evaporate liquid oxygen to generate oxygen and to expand to do work, and the oxygen outlet of the liquid oxygen evaporation expansion unit (11) being connected to the oxygen inlet of the gasifier (2); The liquid oxygen evaporation expansion unit (11) is connected to a liquid oxygen generator (12), the liquid oxygen generator (12) is used to convert mechanical energy generated by the liquid oxygen evaporation expansion unit (11) into electrical energy, and the electrical energy output end of the liquid oxygen generator (12) is connected to a power grid; It also includes a peak-shaving and frequency-modulating control module, the peak-shaving and frequency-modulating control module is electrically connected to the liquefied air separation device (9), and the peak-shaving and frequency-modulating control module is used to adjust the electric load power input to the liquefied air separation device (9); the peak-shaving and frequency-modulating control module is also connected to the pipeline between the oxygen outlet of the liquefied air separation device (9) and the gasifier (2), and the peak-shaving and frequency-modulating control module is also used to control the oxygen flow rate output from the liquefied air separation device (9) to the gasifier; The peak-shaving and frequency-modulating control module is also connected to a pipeline between the liquefied air separation device (9) and the liquid oxygen storage tank (10), and the peak-shaving and frequency-modulating control module is also used to adjust the flow rate input into the liquid oxygen storage tank (10); The peak-shaving and frequency-modulating control module is also connected to a pipeline between the liquid oxygen storage tank (10) and the liquid oxygen evaporation expansion unit (11), and the peak-shaving and frequency-modulating control module is also used to adjust the liquid oxygen flow rate input to the liquid oxygen evaporation expansion unit (11); the peak-shaving and frequency-modulating control module is also connected to a pipeline between the oxygen outlet of the liquid oxygen evaporation expansion unit (11) and the gasifier (2), and the peak-shaving and frequency-modulating control module is also used to adjust the oxygen output flow rate of the liquid oxygen evaporation expansion unit (11); The peak-shaving and frequency-regulating control module is also electrically connected to the liquid oxygen generator (12), and the peak-shaving and frequency-regulating control module is used to regulate the power generated by the liquid oxygen generator (12).

2. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The power output end of the liquid oxygen generator (12) is also connected to the power input end of the peak-shaving and frequency-regulating control module, and the power output end of the gasifier (2) is also connected to the power input end of the peak-shaving and frequency-regulating control module.

3. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The gas turbine (5) is also connected to a gas generator (7), and the power output end of the gas generator (7) is connected to a power grid; The waste heat boiler (6) is also connected to a steam generator (8), and the power output end of the steam generator (8) is connected to the power grid.

4. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The steam outlet of the waste heat boiler (3) is connected to the steam inlet of the waste heat boiler (6), and the flue gas waste heat outlet of the waste heat boiler (6) is connected to the flue gas waste heat inlet of the liquid oxygen evaporation expansion unit (11).

5. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The flue gas wastewater waste heat outlet of the dust removal, desulfurization and purification unit (4) is connected to the liquid oxygen evaporation expansion unit (11).

6. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The liquid oxygen storage tank (10) comprises a packed bed type storage tank or a fixed bed type storage tank.

7. The working method of an IGCC power plant coupled with a liquefied air separation plant system according to claim 1, characterized in that: The nitrogen outlet of the liquefied air separation device (9) is connected to the liquid oxygen storage tank (10), and the nitrogen outlet of the liquefied air separation device (9) is also connected to the nitrogen inlet of the gas turbine (5).

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