WO2022111273A1

WO2022111273A1 - Liquid air-based power generation system

Info

Publication number: WO2022111273A1
Application number: PCT/CN2021/129466
Authority: WO
Inventors: 丁玉龙; 张童童
Original assignee: 丁玉龙; 开尔文热能技术有限公司
Priority date: 2020-11-24
Filing date: 2021-11-09
Publication date: 2022-06-02
Also published as: CN112392599A

Abstract

A liquid air-based power generation system, and a method. The power generation system comprises a liquid air treatment unit (100), a gas turbine power generation unit (200), and a steam turbine power generation unit (300). In a period of peak electricity use, liquid air is pressurized to a required pressure by means of a cryogenic pump (102), and after performing evaporation and simultaneously performing storage on released cold energy in a cold energy storage unit (103), same directly enters into the gas turbine power generation unit (200) and power is generated without needing to pass an air compression assembly (201), and at the same time, high temperature tail gas of a gas turbine (207) enters into the steam turbine power generation unit (300) and power is generated again. In a period of low electricity use, after ambient temperature air is cooled by means of the cold energy storage unit (103) and is pressurized via the air compression assembly (201), same enters into the gas turbine power generation unit (200) and power is generated, and at the same time, high temperature tail gas of the gas turbine (207) enters into the steam turbine power generation unit (300) and power is generated again.

Description

A liquid air-based power generation system and method

technical field

The invention belongs to the field of electric power energy, and in particular relates to a liquid air-based power generation system and method.

Background technique

In the existing gas power generation cycle or gas and steam combined power generation cycle, during the operation process, it is necessary to introduce air to realize the fuel combustion and generate the working fluid of the gas turbine. The ambient air needs to be pressurized to high pressure by the compressor in advance. The compressed air is mixed with the injected fuel and burned to form high temperature and high pressure gas. The gas working medium with working power enters the turbine device to expand and do work. However, the thermal efficiency of the existing single-cycle gas turbine is only about 35-40%, which is largely limited by the high power consumption of the compressor in the process of compressing air. Compared with the power consumption of compression of ambient air, the power consumption of the pressurization process of liquid air is low. If liquid air is used as the air source for the gas power generation cycle or the gas and steam combined power generation cycle, it can save a huge amount of power consumption of the compressor itself, increase the net power generation of the power generation cycle, and then improve the thermal efficiency of the power generation cycle.

technical problem

At this stage, the renewable energy power generation industry is booming, and the installed capacity of renewable energy power stations has repeatedly hit new highs. This leads to the need for traditional generator sets to operate at low loads for a long time to ensure the on-grid power generation of clean renewable energy. However, due to the volatility and intermittent nature of renewable energy, traditional generators need to increase their own power generation when renewable energy is insufficient to maintain the stability of the entire power grid. This leads to the traditional power generation system, although it has a high installed capacity when it is put into construction, but it cannot operate at full load for a long time, resulting in the problems of high investment cost and long cost recovery period. In addition, high-power marine gas turbines are also faced with the same dilemma. The installed gas turbines can meet the basic electricity demand of ships by operating at medium and low loads for a long time, and only operate at full load when necessary.

technical solutions

Purpose of the invention: The technical problem to be solved by the present invention is to provide a liquid air-based power generation system and method for the deficiencies of the prior art, which utilizes liquid air to boost pressure with low power consumption, and efficiently recover and utilize cold energy to reduce compressor function. It can realize the advantages of liquid air energy storage, low-temperature thermal energy storage and gas power generation cycle, thereby realizing high-efficiency power generation.

In order to achieve the above object, the technical scheme adopted by the present invention is as follows:

A liquid air-based power generation system, comprising a liquid air processing unit and a gas turbine power generation unit;

Among them, the liquid air treatment unit includes:

a liquid air storage device that receives and stores liquid air from the outside and has a lower output end;

a cryogenic pump, the upper input end of the cryogenic pump is connected to the lower output end of the liquid air storage device;

a cold energy storage unit, the upper left input end of the cold energy storage unit is connected to the lower output end of the cryogenic pump; the lower input end of the cold energy storage unit is connected to the treated ambient air;

The gas turbine power generation unit includes:

an air compressor unit, the left input end of the air compressor unit is connected to the upper output end of the cold energy storage unit;

a first gas three-way valve, the left input end of the first gas three-way valve is connected with the right output end of the air compressor unit; the lower input end of the first gas three-way valve is connected with the cold energy storage unit The upper right side of the output terminal is connected;

a second gas three-way valve, the left input end of the second gas three-way valve is connected with the right output end of the first gas three-way valve;

a regenerator, the left input end of the regenerator is connected to the lower output end of the second gas three-way valve; the upper output end of the regenerator is a tail gas discharge port;

The third gas three-way valve, the lower input end of the third gas three-way valve is connected to the right output end of the regenerator; the left input end of the third gas three-way valve is connected to the second gas three-way valve The right output end of the through valve is connected;

a combustion chamber, the left input end of the combustion chamber is connected with the right output end of the third gas three-way valve; the lower input end of the combustion chamber is used for delivering fuel into the combustion chamber;

a gas turbine, the left input end of the gas turbine is connected with the right output end of the combustion chamber;

The fourth gas three-way valve, the left input end of the fourth gas three-way valve is connected with the right output end of the gas turbine; the lower output end of the fourth gas three-way valve is connected with the regenerator Lower input connection.

Further, the system also includes a steam turbine power generation unit, and the steam turbine power generation unit includes:

a waste heat boiler, the left input end of the waste heat boiler is connected to the right output end of the fourth gas three-way valve; the right output end of the waste heat boiler is a tail gas discharge port;

a feed pump, the left output end of the feed pump is connected to the upper input end of the waste heat boiler;

a condenser, the upper output end of the condenser is connected with the right input end of the feed water pump;

A steam turbine, the right output end of the steam turbine is connected with the lower input end of the condenser; the left input end of the steam turbine is connected with the lower output end of the waste heat boiler.

Gas power generation cycle or gas and steam combined power generation cycle can use ambient air and liquid air for power generation: in the electricity consumption period or valley period, use ambient air as the air source to meet the basic electricity demand; during peak electricity consumption Or during peak periods, using liquid air as the air source can effectively increase the net power generation of the unit within a period of time, thus avoiding the need to increase the installed capacity of the gas power generation system or the gas-steam combined power generation system in order to cope with the short-term power consumption peak. , resulting in high investment costs and other problems. Therefore, the efficient integration and optimization of liquid air and traditional gas power generation cycle or gas and steam combined cycle is of great significance for reducing the investment cost of the power generation system and improving the power generation capacity, efficiency and peak shaving capacity of the power generation system.

Preferably, the cold energy storage unit is composed of more than one level of cold energy storage sub-units connected in series, the sub-units at all levels use latent heat, sensible heat or thermochemical energy storage materials for storage, and the sub-units at all levels use thermal insulation Material insulation; energy storage material and fluid working medium adopt non-contact or direct contact heat exchange.

Preferably, the air compressor group is composed of a plurality of compressors above one stage; the gas turbine is composed of a plurality of turbines above one stage; the steam turbine is composed of a plurality of turbines above one stage Turbine composition.

Specifically, the fuel transported in the combustion chamber is any one or a mixture of two or more of methane, hydrogen, ammonia, synthesis gas, kerosene or other low calorific value fuels.

The present invention further provides a method for generating electricity by the above-mentioned liquid air-based power generation system, and the device operates in two modes:

In the first mode, only the gas turbine power generation unit participates in power generation, and the steam turbine power generation unit does not participate in power generation. The specific steps include:

During peak hours of electricity consumption, the liquid air stored in the liquid air storage device is pressurized to a high pressure by a cryogenic pump, and then enters the cold energy storage unit to be vaporized to near normal temperature, and at the same time, the cold energy is released and stored in the cold energy storage unit; vaporization After the air enters the regenerator through the first gas three-way valve and the second gas three-way valve, and is preheated by the high-temperature exhaust gas of the gas turbine, it enters the combustion chamber through the third gas three-way valve, and fuel is added to the combustion chamber for combustion and heating; The heated high-temperature gas enters the gas turbine to expand to do work; the expanded high-temperature exhaust gas enters the regenerator through the fourth gas three-way valve to preheat the air, cool down and discharge to the atmosphere;

During the low power consumption period, the ambient air enters the cold energy storage unit, and after being cooled by the stored cold energy, it enters the air compressor unit to be pressurized to high pressure; the high pressure air enters the return air through the first gas three-way valve and the second gas three-way valve After being preheated by the high-temperature exhaust gas in the heater, it enters the combustion chamber through the third gas three-way valve, and fuel is added to the combustion chamber for combustion heating; the heated high-temperature gas enters the gas turbine for expansion and work; the expanded high-temperature exhaust gas passes through the fourth gas. The gas three-way valve enters the regenerator, preheats the air, cools it down and discharges it to the atmosphere.

In the second mode, the gas turbine power generation unit and the steam turbine power generation unit participate in power generation at the same time, and the specific steps include:

During peak hours of electricity consumption, the liquid air stored in the liquid air storage device is pressurized to a high pressure by a cryogenic pump, and then enters the cold energy storage unit to be vaporized to near normal temperature, and at the same time, the cold energy is released and stored in the cold energy storage unit; vaporization After the air passes through the first gas three-way valve, the second gas three-way valve and the third gas three-way valve, it directly enters the combustion chamber, and fuel is added to the combustion chamber for combustion and heating; the heated high-temperature gas enters the gas turbine for expansion and work; The expanded high-temperature exhaust gas enters the waste heat boiler through the fourth gas three-way valve to release heat to generate high-pressure high-temperature steam; the steam enters the steam turbine to expand to do work; after the expanded steam enters the condenser and condenses, it is pressurized to high pressure by the feed pump After re-entering the waste heat boiler, it is heated to high temperature steam to complete the steam cycle;

During the low power consumption period, ambient air enters the cold energy storage unit, and after being cooled by the stored cold energy, it enters the air compressor unit to be pressurized to high pressure; the high-pressure air passes through the first gas three-way valve, the second gas three-way valve and the third gas three-way valve. The three-gas three-way valve directly enters the combustion chamber, and fuel is added to the combustion chamber for combustion and heating; the heated high-temperature gas enters the gas turbine to expand and do work; the expanded high-temperature exhaust gas enters the waste heat boiler through the fourth gas three-way valve to release heat to generate High-pressure and high-temperature steam; the steam enters the steam turbine to expand to do work; the expanded steam enters the condenser and condenses, and is pressurized to high pressure by the feed pump, and then re-enters the waste heat boiler to be heated to high-temperature steam to complete the steam cycle.

This method uses the stored liquid air as the power generation working medium during the peak power consumption period to drive the power generation cycle, avoids the high power consumption of the compressor itself in the power generation cycle, and can significantly improve the total power generation of the power generation system during the peak power consumption period. and power generation efficiency, thereby improving the peak shaving capacity of the power generation system. The high-grade cold energy released by the liquid air in the peak period of electricity consumption is recovered and stored, and in the trough period of electricity consumption, the stored cold energy is used to cool the ambient air and then enter the compressor for pressurization, which significantly reduces the energy consumption. The power consumption of the compressor itself improves the power generation capacity and power generation efficiency of the power generation system.

Specifically, the source of the liquid air in the liquid air storage device is the excess liquid air product in the air separation plant, or the liquid air product produced by using the excess power of the renewable energy power station, or the liquid air stored in the liquid air energy storage power station. liquid air.

beneficial effect

1. The power generation system of the present invention does not need to use the compressor during the peak period of electricity consumption by rationally utilizing the high-quality cooling energy of liquid air and liquid air, and can effectively reduce the power consumption of the compressor itself during the period of low electricity consumption, which significantly improves the power consumption of the compressor. The net power generation and power generation efficiency of the power generation system in each period.

2. The power generation system of the present invention uses liquid air as the power generation working medium to increase the net power generation of the power generation system during the peak period of electricity consumption, and does not need to increase the installed capacity of the generator set in response to the short-term peak power demand, thereby improving the power generation system. Peak shaving capacity and save the investment cost of the power generation system.

3. The liquid air in the power generation system of the present invention comes from the surplus liquid products of the air separation plant, or the surplus electricity produced by the use of renewable energy, or the liquid air stored in the liquid air energy storage plant; the electric energy produced by using the liquid air will It is used for power supply during peak hours, and the electricity price is high, which can produce good economic benefits; it provides a feasible method and scheme for using liquid air to realize the energy efficiency improvement of gas power generation cycle and gas-steam combined power generation cycle.

Description of drawings

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the above-mentioned and/or other aspects of the present invention will become clearer.

FIG. 1 is a schematic diagram of the overall structure of the liquid air-based power generation system of the present invention.

FIG. 2 is a schematic diagram of the liquid air-based power generation system of the present invention using the first operation mode to generate power.

FIG. 3 is a schematic diagram of the second operation mode of the liquid air-based power generation system of the present invention to generate power.

Figure 4 shows the specific power of power generation under different compression ratios using the first operating mode.

Figure 5 shows the thermal efficiency of power generation using the first operating mode under different compression ratios.

Figure 6 shows the specific power of power generation under different compression ratios using the second operating mode.

Fig. 7 shows the thermal efficiency of power generation using the second operation mode under different compression ratios.

Wherein, each reference sign represents: liquid air processing unit 100, liquid air storage device 101, cryogenic pump 102, cold energy storage unit 103, gas turbine power generation unit 200, air compressor unit 201, first gas three-way valve 202, The second gas three-way valve 203, the regenerator 204, the third gas three-way valve 205, the combustion chamber 206, the gas turbine 207, the fourth gas three-way valve 208, the steam turbine power generation unit 300, the waste heat boiler 301, the feed water pump 302, condenser 303, steam turbine 304.

Embodiments of the present invention

The present invention can be better understood in light of the following examples.

The structures, proportions, sizes, etc. shown in the drawings in the description are only used to cooperate with the contents disclosed in the description, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention. The technical substantive significance, any modification of the structure, the change of the proportional relationship or the adjustment of the size, should still fall within the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. within the range that can be covered. Meanwhile, terms such as "upper", "lower", "front", "rear" and "middle" quoted in this specification are only for the convenience of description and clarity, and are not used to limit the scope of the present invention. , the change or adjustment of the relative relationship, without substantial change of the technical content, should also be regarded as the scope of the present invention.

As shown in FIG. 1 , the liquid air-based power generation system of the present invention includes a liquid air processing unit 100 , a gas turbine power generation unit 200 and a steam turbine power generation unit 300 .

The liquid air processing unit 100 includes: a liquid air storage device 101, a cryogenic pump 102, and a high-grade cold energy storage unit 103; the liquid air storage device 101 has a lower output end; the upper input end of the cryogenic pump 102 is connected to the liquid air storage unit The lower output end of the device 101 is connected; the upper left input end of the high-grade cold energy storage unit 103 is connected to the lower output end of the cryogenic pump 102, and the lower input end of the high-grade cold energy storage unit 103 is connected to ambient air.

The gas turbine power generation unit 200 includes: an air compressor unit 201, a first gas three-way valve 202, a second gas three-way valve 203, a regenerator 204, a third gas three-way valve 205, a combustion chamber 206, a gas turbine 207, Four-gas three-way valve 208; the left input end of the air compressor unit 201 is connected to the upper output end of the high-grade cold energy storage unit 103; the left input end of the first gas three-way valve 202 is connected to the right output end of the air compressor unit 201 The lower input end of the first gas three-way valve 202 is connected to the upper right output end of the high-grade cold energy storage unit 103; the left input end of the second gas three-way valve 203 is connected to the output end of the first gas three-way valve 202 The right output end is connected; the left input end of the regenerator 204 is connected with the lower output end of the second gas three-way valve 203, and the upper output end of the regenerator 204 is the exhaust gas discharge port; The lower input end is connected to the right output end of the regenerator 204, the left input end of the third gas three-way valve 205 is connected to the right output end of the second gas three-way valve 203; the left input end of the combustion chamber 206 Connected to the right output end of the third gas three-way valve 205, the lower input end of the combustion chamber 206 is used to deliver fuel to the combustion chamber 206; the left input end of the gas turbine 207 and the right output end of the combustion chamber 206 Connection; the left input end of the fourth gas three-way valve 208 is connected to the right output end of the gas turbine 207 , and the lower output end of the fourth gas three-way valve 208 is connected to the lower input end of the regenerator 204 .

The steam turbine power generation unit 300 includes: a waste heat boiler 301, a feed pump 302, a condenser 303, and a steam turbine 304; the left input end of the waste heat boiler 301 is connected to the right output end of the fourth gas three-way valve 208, and the waste heat boiler The right output end of 301 is the exhaust gas discharge port; the left output end of the feed water pump 302 is connected with the upper input end of the waste heat boiler 301; the upper output end of the condenser 303 is connected with the right input end of the feed water pump 302; The right output end of the flat 304 is connected to the lower input end of the condenser 303 , and the left input end of the steam turbine 304 is connected to the lower output end of the waste heat boiler 301 .

Among them, the cold energy storage unit 103 is formed by connecting more than one level of cold energy storage sub-units in series, the sub-units at all levels use latent heat, sensible heat or thermochemical energy storage materials for storage, and the sub-units at all levels use thermal insulation materials for heat insulation ; Energy storage material and fluid working medium adopt non-contact or direct contact heat exchange. The air compressor group 201 is composed of a plurality of compressors above one stage; the gas turbine 207 is composed of a plurality of turbines above a first stage; the steam turbine 304 is composed of a plurality of turbines above a first stage .

The method for generating electricity using the above-mentioned liquid air-based power generation system includes the following two operating modes:

As shown in FIG. 2 , in the first mode, only the gas turbine power generation unit 200 participates in power generation, while the steam turbine power generation unit 300 does not participate in power generation. The specific steps include:

During the peak period of electricity consumption, the liquid air stored in the liquid air storage device 101 is pressurized to a high pressure by the cryogenic pump 102, and then enters the high-grade cold energy storage unit 103 to be vaporized to near normal temperature, and at the same time, the high-grade cold energy is released and stored in the high-grade cold energy storage unit 103. In the high-grade cold energy storage unit 103; the vaporized air enters the regenerator 204 through the first gas three-way valve 202 and the second gas three-way valve 203 and is preheated by the high-temperature exhaust gas, and passes through the third gas three-way valve 205. Enter the combustion chamber 206, add fuel to the combustion chamber 206 for combustion and heating; the heated high-temperature gas enters the gas turbine 207 for expansion and work; the expanded high-temperature exhaust gas enters the regenerator 204 through the fourth gas three-way valve 208 to preheat the air in the regenerator 204 After cooling down and discharging to the atmosphere;

During the low power consumption period, ambient air enters the high-grade cold energy storage unit 103, and after being cooled and cooled by the stored high-grade cold energy, it enters the air compressor unit 201 to be pressurized to high pressure; the high-pressure air passes through the first gas three-way valve 202 and the third After the two-gas three-way valve 203 enters the regenerator 204 and is preheated by the high-temperature exhaust gas, it enters the combustion chamber 206 through the third gas three-way valve 205, and fuel is added to the combustion chamber 206 for combustion and heating; The flat 207 expands to do work; the expanded high-temperature exhaust gas enters the regenerator 204 through the fourth gas three-way valve 208 to preheat the air, cool it down, and discharge it to the atmosphere.

As shown in FIG. 3 , in the second mode, the gas turbine power generation unit 200 and the steam turbine power generation unit 300 participate in power generation at the same time, and the specific steps include:

During the peak period of electricity consumption, the liquid air stored in the liquid air storage device 101 is pressurized to a high pressure by the cryogenic pump 102, and then enters the high-grade cold energy storage unit 103 to be vaporized to near normal temperature, and at the same time, the high-grade cold energy is released and stored in the high-grade cold energy storage unit 103. In the high-grade cold energy storage unit 103; the vaporized air directly enters the combustion chamber 206 through the first gas three-way valve 202, the second gas three-way valve 203 and the third gas three-way valve 205, and fuel is added to the combustion chamber 206 Combustion and heating; the heated high-temperature gas enters the gas turbine 207 for expansion and work; the expanded high-temperature exhaust gas enters the waste heat boiler 301 through the fourth gas three-way valve 208 to release heat to generate high-pressure high-temperature steam; the steam enters the steam turbine 304 for expansion and work; After the expanded steam enters the condenser 303 for condensation, it is pressurized to a high pressure by the feed pump 302, and then re-enters the waste heat boiler 301 to be heated to high temperature steam to complete the steam cycle;

During the low power consumption period, ambient air enters the high-grade cold energy storage unit 103, and after being cooled and cooled by the stored high-grade cold energy, it enters the air compressor unit 201 to be pressurized to high pressure; the high-pressure air passes through the first gas three-way valve 202, the third The second gas three-way valve 203 and the third gas three-way valve 205 directly enter the combustion chamber 206, and fuel is added to the combustion chamber 206 for combustion and heating; the heated high-temperature gas enters the gas turbine 207 for expansion and work; the expanded high-temperature exhaust gas passes through the first The four-gas three-way valve 208 enters the waste heat boiler 301 to release heat to generate high-pressure and high-temperature steam; the steam enters the steam turbine 304 to expand and perform work; the expanded steam enters the condenser 303 and condenses, and is pressurized to high pressure by the feed pump 302. After re-entering the waste heat boiler 301, it is heated to high temperature steam to complete the steam cycle.

The fuel delivered in the combustion chamber 206 is any one or a mixture of two or more of methane, hydrogen, ammonia, synthesis gas, kerosene or other low calorific value fuels. The source of the liquid air in the liquid air storage device 101 is the excess liquid air product in the air separation plant, or the liquid air product produced by using the surplus power of the renewable energy power station, or the liquid air stored in the liquid air energy storage power station.

Figure 4 shows the comparison results of the specific power generation of the system during the low power consumption period and the power consumption peak period and the power generation specific power of the traditional gas power generation cycle under different compression ratios when the first operation mode is used for power generation.

Figure 5 shows the comparison results of the thermal efficiency of the system in the low power consumption period and the power consumption peak period and the thermal efficiency of the traditional gas power generation cycle under different compression ratios when the first operation mode is used for power generation.

The first operation mode is suitable for small-scale power plants that only invest in the construction of gas turbines. The high-temperature exhaust gas from the gas turbine outlet will enter the regenerator to preheat the air before entering the combustion chamber. In order to further illustrate the advantages of the power generation system of the present invention, the first operation mode is simulated and calculated, and the system performance parameters are shown in Table 1. Under this condition, the specific power of the system can be increased by 78%-115% compared with the traditional gas-fired power generation cycle, and the thermal efficiency of the system can be increased by 78%-115% compared with the traditional gas-fired power generation cycle.

Table 1

Figure 6 shows the comparison results of the specific power generation of the system during the low power consumption period and the power consumption peak period and the power generation specific power of the traditional gas-steam combined power generation cycle under different compression ratios when the second operation mode is used for power generation.

Figure 7 shows the comparison results of the thermal efficiency of the system during the low power consumption period and the power consumption peak period and the thermal efficiency of the traditional gas-steam combined power generation cycle under different compression ratios when the second operation mode is used for power generation.

The second operation mode is suitable for the investment and construction of large-scale power stations with combined power generation of gas turbine and steam turbine. The high temperature exhaust gas from the gas turbine outlet will enter the waste heat boiler to generate high temperature steam for the steam turbine to generate electricity. In order to further illustrate the advantages of the power generation system of the present invention, the second operation mode is simulated and calculated, and the system performance parameters are shown in Table 2. Under this condition, the specific power generation of the system can be increased by 49%-73% compared with the traditional gas-steam combined power generation cycle, and the thermal efficiency of the system can be increased by 7%-29% compared with the traditional gas-steam combined power generation cycle.

Table 2

The present invention provides an idea and method for a power generation system and method based on liquid air. There are many specific methods and approaches for realizing the technical solution. The above are only the preferred embodiments of the present invention. For those of ordinary skill, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

A liquid air-based power generation system, characterized by comprising a liquid air processing unit (100) and a gas turbine power generation unit (200);

Wherein, the liquid air processing unit (100) includes:

a liquid air storage device (101), the liquid air storage device (101) receiving and storing liquid air from the outside, and having a lower output end;

a cryogenic pump (102), the upper input end of the cryogenic pump (102) is connected to the lower output end of the liquid air storage device (101);

A cold energy storage unit (103), the upper left input end of the cold energy storage unit (103) is connected with the lower output end of the cryogenic pump (102); the lower input end of the cold energy storage unit (103) is connected through treated ambient air;

The gas turbine power generation unit (200) includes:

an air compressor unit (201), the left input end of the air compressor unit (201) is connected to the upper output end of the cold energy storage unit (103);

a first gas three-way valve (202), the left input end of the first gas three-way valve (202) is connected to the right output end of the air compressor unit (201); the first gas three-way valve (202) ) is connected to the upper right output end of the cold energy storage unit (103);

A second gas three-way valve (203), the left input end of the second gas three-way valve (203) is connected to the right output end of the first gas three-way valve (202);

A regenerator (204), the left input end of the regenerator (204) is connected to the lower output end of the second gas three-way valve (203); the upper output end of the regenerator (204) is the exhaust gas exhaustion hole;

A third gas three-way valve (205), the lower input end of the third gas three-way valve (205) is connected to the right output end of the regenerator (204); the third gas three-way valve (205) The left input end of the gas is connected to the right output end of the second gas three-way valve (203);

A combustion chamber (206), the left input end of the combustion chamber (206) is connected with the right output end of the third gas three-way valve (205); the lower input end of the combustion chamber (206) is used for combustion delivering fuel within the chamber (206);

a gas turbine (207), the left input end of the gas turbine (207) is connected to the right output end of the combustion chamber (206);

a fourth gas three-way valve (208), the left input end of the fourth gas three-way valve (208) is connected to the right output end of the gas turbine (207); the fourth gas three-way valve (208) The lower output end of ) is connected to the lower input end of the regenerator (204).
The liquid air-based power generation system according to claim 1, further comprising a steam turbine power generation unit (300), wherein the steam turbine power generation unit (300) includes:

A waste heat boiler (301), the left input end of the waste heat boiler (301) is connected to the right output end of the fourth gas three-way valve (208); the right output end of the waste heat boiler (301) is exhaust gas discharge mouth;

a feed water pump (302), the left output end of the feed water pump (302) is connected to the upper input end of the waste heat boiler (301);

a condenser (303), the upper output end of the condenser (303) is connected to the right input end of the feed water pump (302);

A steam turbine (304), the right output end of the steam turbine (304) is connected to the lower input end of the condenser (303); the left input end of the steam turbine (304) is connected to the waste heat The lower output of the boiler (301) is connected.
The power generation system based on liquid air according to claim 1 or 2, characterized in that, the cold energy storage unit (103) is composed of more than one level of cold energy storage sub-units connected in series, and the sub-units of each level use latent heat , sensible heat or thermochemical energy storage materials for storage, and all sub-units at all levels use thermal insulation materials for heat insulation; energy storage materials and fluid working medium adopt non-contact or direct contact heat exchange.
The power generation system based on liquid air according to claim 1 or 2, characterized in that, the air compressor group (201) is composed of a plurality of compressors with more than one stage; the gas turbine (207) is composed of It is composed of multiple turbines above one level.
The power generation system based on liquid air according to claim 2, characterized in that, the steam turbine (304) is composed of a plurality of turbines with one or more stages.
The power generation system based on liquid air according to claim 1 or 2, characterized in that, the fuel transported in the combustion chamber (206) is any one of methane, hydrogen, ammonia, synthesis gas, and kerosene or a mixture of two or more.
The method for generating electricity based on the liquid air-based power generation system of claim 1, wherein:

During peak hours of electricity consumption, the liquid air stored in the liquid air storage device (101) is pressurized to a high pressure by a cryogenic pump (102), and then enters the cold energy storage unit (103) to be vaporized to near normal temperature, and simultaneously releases cold energy and Stored in the cold energy storage unit (103); the vaporized air enters the regenerator (204) through the first gas three-way valve (202) and the second gas three-way valve (203) and is preheated by the high-temperature exhaust gas of the gas turbine , enter the combustion chamber (206) through the third gas three-way valve (205), and add fuel to the combustion chamber (206) for combustion and heating; the heated high-temperature gas enters the gas turbine (207) for expansion and work; the expanded high-temperature exhaust gas Entering into the regenerator (204) through the fourth gas three-way valve (208) to preheat the air, cool it down, and discharge it to the atmosphere;

During the low electricity consumption period, ambient air enters the cold energy storage unit (103), and after being cooled by the stored cold energy, enters the air compressor unit (201) to be pressurized to high pressure; the high pressure air passes through the first gas three-way valve (202) After entering the regenerator (204) with the second gas three-way valve (203) and being preheated by the high-temperature exhaust gas, it enters the combustion chamber (206) through the third gas three-way valve (205), and is added to the combustion chamber (206). The fuel is burned and heated; the heated high-temperature gas enters the gas turbine (207) for expansion and work; the expanded high-temperature exhaust gas enters the regenerator (204) through the fourth gas three-way valve (208) to preheat the air, cool down and discharge to the atmosphere .
The method for generating electricity based on the liquid air-based power generation system of claim 2, characterized in that:

During peak hours of electricity consumption, the liquid air stored in the liquid air storage device (101) is pressurized to a high pressure by a cryogenic pump (102), and then enters the cold energy storage unit (103) to be vaporized to near normal temperature, and simultaneously releases cold energy and stored in the cold energy storage unit (103); the vaporized air directly enters the combustion chamber (202), the second gas three-way valve (203) and the third gas three-way valve (205) 206), adding fuel to the combustion chamber (206) for combustion and heating; the heated high-temperature gas enters the gas turbine (207) for expansion and work; the expanded high-temperature exhaust gas enters the waste heat boiler (301) through the fourth gas three-way valve (208) ) to release heat in high-pressure and high-temperature steam; the steam enters the steam turbine (304) to expand and do work; after the expanded steam enters the condenser (303) for condensation, it is pressurized to high pressure by the feed pump (302), and then enters the waste heat again. The boiler (301) is heated to high temperature steam to complete the steam cycle;

During the low electricity consumption period, ambient air enters the cold energy storage unit (103), and after being cooled by the stored cold energy, enters the air compressor unit (201) to be pressurized to high pressure; the high pressure air passes through the first gas three-way valve (202) , the second gas three-way valve (203) and the third gas three-way valve (205) directly enter the combustion chamber (206), and fuel is added to the combustion chamber (206) for combustion and heating; the heated high-temperature gas enters the gas turbine (206). 207) Expansion does work; the expanded high-temperature exhaust gas enters the waste heat boiler (301) through the fourth gas three-way valve (208) to release heat to generate high-pressure high-temperature steam; the steam enters the steam turbine (304) for expansion and work; the expanded steam enters After condensing in the condenser (303), it is pressurized to high pressure by the feed water pump (302), and then re-entered into the waste heat boiler (301) to be heated to high temperature steam to complete the steam cycle.
The method for generating electricity according to the liquid air-based power generation system according to claim 7 or 8, characterized in that: the source of the liquid air in the liquid air storage device (101) is the excess liquid air product in the air separation plant, or Liquid air products produced using excess electricity from renewable energy power plants, or liquid air stored in liquid air energy storage power plants.