A system and method for operating a combined cycle unit coupled with compressed air energy storage

Abstract

The application discloses a system and an operation method for combined cycle unit coupled with compressed air energy storage, which comprises: a, a combined cycle generating unit; b, a flue gas waste heat utilization heat pump unit; c, a compressed air energy storage system; d, a flue gas-air heat exchanger and an air turbine power generation system. In the peak shaving condition, the combined cycle unit supplies power to the air compressor for energy storage, the condensate water and the heat pump unit are used to freeze water to cool the outlet air of the compressor, and the condensate water in the air is used to supplement the condenser and the cooling tower. In the peak load condition, part of the flue gas from the gas turbine is used to heat the compressed air from the air storage device, so as to increase the inlet air temperature of the air turbine. By adopting the application, the overall peak shaving and peak load capacity of the system is improved, the operation flexibility of the compressed air energy storage system is improved, the inlet air temperature of the air turbine and the condensate water temperature of the waste heat boiler are improved, the water supplement rate of the combined cycle unit is reduced, the power supply loss of the air compressor is reduced, and the overall operation benefit of the system is improved.

Description

Technical Field

[0001] This invention belongs to the field of compressed air energy storage and combined cycle units, and particularly relates to a system and operation method for coupled compressed air energy storage in a combined cycle unit. Background Technology

[0002] Compressed air energy storage (CAES) is an energy storage technology developed based on gas turbine technology. It uses electrical energy to compress air to high pressure and stores it in sealed containers such as underground salt caverns, underground mines, or high-pressure vessels. When generating electricity, the stored compressed air is released to drive a turbine. This technology is currently the only proven energy storage technology capable of large-scale energy storage, comparable to pumped hydro systems.

[0003] Based on their operating principles, compressed air energy storage systems are divided into two categories: afterburning and non-afterburning. Currently, all commercially operational compressed air energy storage systems internationally employ afterburning: during energy storage, a motor drives a compressor to compress air to high pressure and store it in a storage chamber; during energy release, the high-pressure air in the storage chamber enters a gas turbine, mixes and burns with fuel in the combustion chamber, driving the gas turbine to perform work, which in turn drives a generator to output electrical energy, thus completing the power generation process. However, afterburning compressed air energy storage not only wastes the heat of air compression during the energy storage phase but also requires fuel afterburning to achieve the system's cyclical operation, resulting in low energy storage efficiency and environmental problems. Furthermore, its dependence on fuels such as natural gas limits the system's widespread application.

[0004] Domestically, the compressed air energy storage industry is currently in the stage of gradually breaking through the key technologies of 1-100MW systems, and commercial projects of over 100MW are being accelerated. The compressed air energy storage projects already in operation are all non-fuel-based compressed air energy storage units, mainly including: the 1.5MW supercritical compressed air energy storage demonstration project in Langfang, Hebei; the 500kW compressed air energy storage demonstration project in Wuhu, Anhui; the 10MW compressed air energy storage verification platform in Bijie, Guizhou; the 10MW compressed air energy storage peak-shaving power station project in Feicheng, Shandong; the 500kW liquid air energy storage demonstration project in Tongli, Jiangsu (State Grid); the 60MW salt cavern compressed air energy storage demonstration project in Jintan, China Salt; and the 100MW advanced compressed air energy storage demonstration project in Zhangjiakou, etc.

[0005] Existing non-combustion compressed air energy storage units have the following problems during actual operation:

[0006] (1) Because the heat stored in the compressed air energy storage process heats the compressed air during the power generation process, the temperature of the compressed air entering the air turbine is low, which leads to low efficiency of the power generation process.

[0007] (2) Because room temperature water or low temperature heat transfer oil after heat exchange is used to cool the high temperature air at the compressor outlet during compressed air energy storage, it is easy to cause a mismatch between the heat storage and heat exchange in the energy storage cycle and the heat exchange required for the compression and power generation processes. This results in a serious drop in the temperature of the compressed air during the power generation process or a significant reduction in the efficiency and energy storage capacity during the energy storage process. This reflects that the existing heat storage and heat exchange design schemes severely limit the operational flexibility and efficiency stability of compressed air energy storage units. For example, if the grid cannot schedule the charging, resting, and power generation times according to the rated schedule, after multiple failures to operate according to the prescribed cycle, there will be insufficient refrigerant or an increase in temperature in the heat storage tank before the compression process begins. This causes a mismatch between the heat stored in the heat storage medium and the cooling heat required by the compressor in the energy storage process, resulting in the compression process failing to operate according to the design parameters.

[0008] (3) Existing compressed air energy storage power stations all use high-voltage electricity from the grid to power the compressor motor after it is transformed by a transformer. As a result, the system efficiency loss always exists in the transformer loss during the energy storage process.

[0009] Currently, there are many shortcomings in the design and operation of combined cycle generator units, mainly including: (1) The flue gas temperature of the waste heat boiler of conventional combined cycle generator units is about 90℃~110℃. The high flue gas temperature directly causes the loss of the overall thermal efficiency of the combined cycle unit; (2) Most of the combined cycle units currently built in China use cooling towers as the heat dissipation equipment for the cold end of the steam turbine. During operation, the cooling towers need to release a large amount of water into the atmosphere, which results in the waste of water resources; (3) Leakage is inevitable in the steam and water thermal cycle process, which leads to the need for the power plant to continuously prepare demineralized water to make up for the condenser; (4) Under the deep peak shaving operation condition, the economic efficiency of the combined cycle unit is significantly reduced. Studies have shown that the combined cycle power generation efficiency at 30% load is 15 to 20 percentage points lower than that at 100% rated load. Summary of the Invention

[0010] The purpose of this invention is to provide a system and operating method for coupled compressed air energy storage in a combined cycle unit. This system and method can significantly increase the inlet temperature of the air turbine during the power generation process of the compressed air energy storage power station, thereby improving cycle efficiency. It can also effectively improve the operational flexibility and efficiency of the compressed air energy storage unit, ensuring that both energy storage and power generation processes operate according to design parameters. The system can reduce losses during power transmission, thereby improving overall efficiency. Furthermore, by recovering condensate from the air, the system's makeup water rate is significantly reduced, and by increasing the inlet condensate temperature of the waste heat boiler, the power generation efficiency of the combined cycle unit is improved.

[0011] To achieve the above objectives, the present invention employs the following technical solution:

[0012] A system for coupled compressed air energy storage in a combined cycle unit includes:

[0013] Combined cycle generator sets are used to provide a driving heat source for flue gas waste heat utilization heat pump units, a driving power source for the compressors of compressed air energy storage systems, and a medium-temperature circulating cooling water source for flue gas waste heat utilization heat pump units, as well as a cooling water source for the high-temperature coolers between compressor stages and the high-temperature coolers at the outlet of high-pressure compressors, when grid load demand is low. When grid load demand is high, they provide high-temperature heated flue gas for flue gas-air heat exchanger air turbine power generation systems.

[0014] The flue gas waste heat utilization heat pump unit is used to absorb the waste heat from the combined cycle unit boiler as a driving heat source, and uses the medium-temperature circulating cooling water provided by the combined cycle generator unit to generate low-temperature chilled water to provide cooling water for the compressor interstage low-temperature cooler and the high-pressure compressor outlet low-temperature cooler.

[0015] Compressed air energy storage systems are used to store compressed air under conditions of low grid load demand and deep peak shaving operation of generator units. A portion of the heat generated during air compression is transferred to the condensate of the combined cycle generator unit, improving overall system efficiency. The condensate generated after air compression and cooling serves as makeup water for the condenser and cooling tower of the combined cycle generator unit. When grid load demand is high, it provides high-pressure, low-temperature compressed air for power generation to the flue gas-air heat exchanger and air turbine power generation system.

[0016] The flue gas-air heat exchanger and air turbine power generation system heats the high-pressure compressed air provided by the compressed air energy storage system and the low-temperature reheated compressed air discharged from the high-pressure air turbine when the grid load demand is high, and expands in the air turbine to do work and output electrical energy.

[0017] A further improvement of the present invention is that the combined cycle generator set includes a gas turbine generator set, a waste heat boiler system, and a steam turbine generator set;

[0018] Gas turbine generator sets use gas or oil as fuel to provide heated flue gas for waste heat boiler systems and to provide heated flue gas for flue gas-air heat exchangers and air turbine power generation systems when grid load demand is high.

[0019] The waste heat boiler system utilizes high-temperature flue gas from the gas turbine generator set to heat low-temperature steam and water working fluids such as condensate and low-temperature reheat steam from the steam turbine generator set, providing high-temperature and high-pressure steam to the steam turbine generator set and discharging the flue gas into the atmosphere after reducing its temperature; the waste heat boiler system also heats the circulating water in the waste heat recovery heat exchanger of the waste heat boiler flue gas to provide a driving heat source for the waste heat utilization heat pump unit of the flue gas.

[0020] The steam turbine generator set generates electricity using high-temperature and high-pressure steam provided by the waste heat boiler, and provides the waste heat boiler with low-temperature steam and water working fluids such as condensate and low-temperature reheat steam; the steam turbine generator set provides medium-temperature circulating cooling water for the flue gas waste heat utilization heat pump unit; the steam turbine generator set provides cooling water for the high-temperature cooler between compressor stages and the high-temperature cooler at the outlet of the high-pressure compressor in the compressed air energy storage system.

[0021] Both gas turbine generator sets and steam turbine generator sets provide drive shaft power to the generator.

[0022] A further improvement of the present invention is that the waste heat recovery heat pump unit includes: a heat pump unit, a waste heat boiler flue gas waste heat recovery heat exchanger, a waste heat boiler flue gas waste heat recovery circulating pump, a waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve and a waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve.

[0023] The outlet pipe of the waste heat recovery circulation pump is connected to the inlet valve of waste heat recovery heat exchanger B; the outlet pipe of the inlet valve of waste heat recovery heat exchanger B is connected to the water-side inlet of waste heat recovery heat exchanger B; the water-side outlet of waste heat recovery heat exchanger B is connected to the outlet valve of waste heat recovery heat exchanger B; the outlet of the outlet valve of waste heat recovery heat exchanger B is connected to the inlet of the heat pump unit's drive heat source; and the outlet pipe of the heat pump unit's drive heat source is connected to the inlet of the waste heat recovery circulation pump.

[0024] A further improvement of the present invention is that the compressed air energy storage system comprises: a compressed air storage device, a high-pressure compressor, a low-pressure compressor, a compressor drive motor, a compressor interstage high-temperature cooler, a compressor interstage low-temperature cooler, a high-pressure compressor outlet low-temperature cooler, a high-pressure compressor outlet high-temperature cooler, a high-pressure compressor outlet cooler drain tank and a water storage tank, as well as valve groups from the compressed air storage device H to the flue gas / air heat exchanger system, an inlet valve from the compressor to the compressed air storage chamber, a water supply valve group from the heat pump unit to the compressor interstage cooler G, a return water valve group from the compressor interstage low-temperature cooler G to the heat pump unit, and a drain tank for the compressor interstage cooler. S-channel condensate to condenser valve group, S-channel condensate tank of compressor interstage cooler to cooling tower water pool valve group, V-channel condensate tank of high-pressure compressor outlet cooler to condenser valve group, V-channel condensate tank of high-pressure compressor outlet cooler to cooling tower water pool valve group, T-channel supply valve group of heat pump unit to high-pressure compressor outlet cooler T, T-channel return valve group of high-pressure compressor outlet low-temperature cooler T to heat pump unit, U-channel supply valve of condensate to high-pressure compressor outlet high-temperature cooler U, U-channel outlet water of high-pressure compressor outlet high-temperature cooler U to waste heat boiler condensate system valve group, X-channel condensate tank of compressor interstage cooler to water storage tank, and X-channel condensate tank of high-pressure compressor outlet cooler V to water storage tank.

[0025] The low-pressure compressor outlet pipe is connected to the air-side inlet of the compressor interstage high-temperature cooler; the air-side outlet of the compressor interstage high-temperature cooler is connected to the air-side inlet of the compressor interstage low-temperature cooler; the air-side outlet of the compressor interstage low-temperature cooler is connected to the high-pressure compressor inlet; the high-pressure compressor outlet is connected to the air-side inlet of the high-pressure compressor outlet high-temperature cooler; the high-pressure compressor outlet high-temperature cooler air-side outlet is connected to the air-side inlet of the high-pressure compressor outlet low-temperature cooler; the high-pressure compressor outlet low-temperature cooler air-side outlet is connected to the compressor to compressed air storage chamber inlet valve; the compressor to compressed air storage chamber inlet valve outlet pipe is connected to the compressed air storage device; the compressed air storage device outlet is connected to the compressed air storage device H to flue gas / air heat exchanger system valve group.

[0026] A tee is installed from the condensate pump outlet header of the steam turbine generator set, and branch pipes are connected to the inlet of the circulating water pump of the compressor interstage high-temperature cooler. A tee is also installed on the outlet pipe of the compressor interstage high-temperature cooler circulating water pump, with branch pipes connecting to the condensate supply valve to the compressor interstage high-temperature cooler F. The valve group connecting the condensate outlet of compressor interstage high-temperature cooler F to the waste heat boiler condensate system and the condensate supply valve to the high-pressure compressor outlet high-temperature cooler U are also connected. The outlet of the condensate supply valve to compressor interstage high-temperature cooler F is connected to the cooling water inlet of the compressor interstage high-temperature cooler. Condensate flows to the high-pressure compressor... The outlet of the high-temperature cooler U is connected to the outlet of the high-pressure compressor outlet high-temperature cooler. The cooling water side outlet of the compressor interstage high-temperature cooler is connected to the valve group of the compressor interstage high-temperature cooler F outlet water to the waste heat boiler condensate system. The cooling water side outlet of the high-pressure compressor outlet high-temperature cooler is connected to the valve group of the high-pressure compressor outlet high-temperature cooler U outlet water to the waste heat boiler condensate system. The outlets of the valve groups of the compressor interstage high-temperature cooler F outlet water to the waste heat boiler condensate system and the valve group of the high-pressure compressor outlet high-temperature cooler U outlet water to the waste heat boiler condensate system are both connected to the condensate pipeline of the combined cycle unit.

[0027] A pipe is connected from the chilled water outlet of the heat pump unit to the cooling circulation pump of the interstage cryogenic cooler between the heat pump unit and the compressor. A tee is installed on the outlet pipe of the cooling circulation pump of the interstage cryogenic cooler between the compressor and the compressor to connect branch pipes to the water supply valve group of the interstage cooler G between the heat pump unit and the water supply valve group of the outlet cooler T between the heat pump unit and the high-pressure compressor. The outlet of the water supply valve group of the interstage cooler G between the heat pump unit and the compressor is connected to the cooling water inlet of the interstage cryogenic cooler. The outlet of the water supply valve group of the outlet cooler T between the heat pump unit and the high-pressure compressor is connected to the cooling water inlet of the outlet cryogenic cooler of the high-pressure compressor. The cooling water outlet of the interstage cryogenic cooler is connected to the return water valve group of the interstage cryogenic cooler G between the heat pump unit and the compressor. The cooling water outlet of the outlet cryogenic cooler T between the high-pressure compressor and the heat pump unit is connected to the return water valve group of the outlet cryogenic cooler T between the high-pressure compressor and the heat pump unit. The outlet pipes of the return water valve group of the interstage cryogenic cooler G between the heat pump unit and the high-pressure compressor outlet cryogenic cooler T between the heat pump unit and the heat pump unit are combined and connected to the chilled water return port of the heat pump unit.

[0028] The drain pipes of the compressor interstage cryogenic cooler and the compressor interstage high-temperature cooler are connected to the compressor interstage cooler drain tank. The drain pipes of the high-pressure compressor outlet cryogenic cooler and the high-pressure compressor outlet high-temperature cooler are connected to the high-pressure compressor outlet cooler drain tank. The first outlet of the compressor interstage cooler drain tank is connected to the valve group from which water flows from the compressor interstage cooler drain tank S to the cooling tower water pool. The outlet of the valve group from which water flows from the compressor interstage cooler drain tank S to the cooling tower water pool is connected to the turbine generator set cooling tower makeup water. The second outlet of the compressor interstage cooler drain tank is connected to the valve group from which water flows from the compressor interstage cooler drain tank S to the condenser. The outlet of the valve group from which water flows from the compressor interstage cooler drain tank S to the condenser is connected to the turbine generator set condenser makeup water. The third outlet of the compressor interstage cooler drain tank is connected to the compressor interstage cooler drain. The drain tank of the compressor interstage cooler drain tank is connected to the X valve group of the water storage tank. The first outlet of the high-pressure compressor outlet cooler drain tank is connected to the valve group of the high-pressure compressor outlet cooler V drain tank to the cooling tower water pool. The outlet of the valve group of the high-pressure compressor outlet cooler V drain tank to the cooling tower water pool is connected to the water supply to the turbine generator cooling tower. The second outlet of the high-pressure compressor outlet cooler drain tank is connected to the valve group of the high-pressure compressor outlet cooler V drain tank to the cooling tower water pool. The outlet of the valve group of the high-pressure compressor outlet cooler V drain tank to the cooling tower water pool is connected to the water supply to the turbine generator condenser. The third outlet of the high-pressure compressor outlet cooler drain tank is connected to the X valve group of the high-pressure compressor outlet cooler drain tank V to the water storage tank. The X valve group of the high-pressure compressor outlet cooler drain tank V to the water storage tank is connected to the water storage tank.

[0029] A further improvement of the present invention is that the flue gas-air heat exchanger and air turbine power generation system includes: a low-temperature flue gas / air heat exchanger, a high-temperature flue gas / air heat exchanger, a flue gas / air reheater, a low-pressure air turbine, a high-pressure air turbine, an air turbine generator, and a flue gas damper for the gas turbine exhaust to the flue gas / air heat exchanger system and a flue gas damper for the gas turbine exhaust to the waste heat boiler inlet.

[0030] The compressed air pipeline from the compressed air storage device H of the compressed air energy storage system to the outlet of the flue gas / air heat exchanger system valve group is connected to the air-side inlet of the flue gas / air low-temperature heat exchanger. The pipeline from the air-side outlet of the flue gas / air low-temperature heat exchanger is connected to the air-side inlet of the flue gas / air high-temperature heat exchanger. The pipeline from the air-side outlet of the flue gas / air high-temperature heat exchanger is connected to the high-pressure air turbine inlet valve of the air turbine generator set. The high-pressure air turbine exhaust pipeline is connected to the air-side inlet of the flue gas / air reheater. The air-side outlet of the flue gas / air reheater is connected to the low-pressure air turbine inlet valve. The low-pressure air turbine exhaust is discharged into the atmosphere.

[0031] A three-way bypass flue is added to the exhaust flue of the gas turbine generator set, and a flue gas damper is added to the gas turbine exhaust to the flue gas / air heat exchanger system. A flue gas damper is added to the flue of the gas turbine exhaust to the waste heat boiler system. The flue gas from the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper outlet enters the flue gas side inlet of the flue gas / air high-temperature heat exchanger and the flue gas / air reheater. The flue gas from the outlet of the flue gas / air high-temperature heat exchanger and the flue gas / air reheater enters the flue gas side inlet of the flue gas / air low-temperature heat exchanger. The flue gas side outlet of the flue gas / air low-temperature heat exchanger is connected to the tail flue of the waste heat boiler.

[0032] An operation method for a combined cycle unit coupled with compressed air energy storage system, comprising:

[0033] (1) When the power grid load demand is low and deep peak regulation is in place, the system is in energy storage state, starts the flue gas waste heat utilization heat pump unit and compressed air energy storage system, and shuts down the flue gas-air heat exchanger and air turbine power generation system.

[0034] Open the following valves: gas turbine exhaust to waste heat boiler inlet flue gas damper; compressor to compressed air storage chamber inlet valve; heat pump unit to compressor interstage cooler G water supply valve group; compressor interstage low-temperature cooler G to heat pump unit return water valve group; condensate to compressor interstage high-temperature cooler F water supply valve; compressor interstage high-temperature cooler F outlet water to waste heat boiler condensate system valve group; cooling tower circulating water supply to heat pump unit A medium-temperature water supply valve; heat pump unit A medium-temperature water outlet to cooling tower return water valve; waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve; waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve; pressure... The compressor interstage cooler drain tank S drains water to the condenser valve group, the compressor interstage cooler drain tank S drains water to the cooling tower water tank valve group, the high-pressure compressor outlet cooler V drains water to the condenser valve group, and the high-pressure compressor outlet cooler V drains water to the cooling tower water tank valve group; the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper and the compressed air storage device H to the flue gas / air heat exchanger system valve group are closed; the compressor interstage high-temperature cooler circulating water pump, the waste heat boiler flue gas waste heat recovery circulating pump, the heat pump unit, the heat pump unit to the compressor interstage low-temperature cooler cooling circulating pump, and the compressor drive motor are started.

[0035] The waste heat recovery circulation pump of the waste heat boiler flue gas transports low-temperature waste heat utilization circulating water to the waste heat recovery heat exchanger of the waste heat boiler flue gas. After absorbing heat and increasing temperature in the waste heat recovery heat exchanger of the waste heat boiler flue gas, the low-temperature waste heat utilization circulating water returns to the heat pump unit to drive the heat pump unit to work.

[0036] Air enters the low-pressure compressor and is compressed, increasing its pressure and temperature to 200℃~350℃. After passing through the compressor stage high-temperature cooler and compressor stage low-temperature cooler, the air is cooled to 25℃~40℃ and enters the high-pressure compressor. After entering the high-pressure compressor, the air is compressed, increasing its pressure and temperature to ~120℃. After passing through the high-pressure compressor outlet high-temperature cooler and high-pressure compressor outlet low-temperature cooler, the air is cooled to 25℃~40℃ and enters the compressed air storage device.

[0037] A portion of the low-temperature circulating water from the turbine generator set's cooling tower enters the heat pump unit to remove the heat pump unit's medium-temperature waste heat, and then returns to the cooling tower for cooling.

[0038] Condensate from the outlet pipe of the steam turbine generator set condensate pump is pressurized by the circulating water pump of the compressor interstage high temperature cooler and then enters the high-pressure compressor outlet high temperature cooler and the compressor interstage high temperature cooler through a three-way valve. After absorbing the heat of the compressed air, it returns to the condensate header.

[0039] The low-temperature chilled water from the heat pump unit is pressurized by the cooling circulation pump of the compressor interstage cryogenic cooler after passing through the heat pump unit. It then enters the high-pressure compressor outlet cryogenic cooler and the compressor interstage cryogenic cooler through a three-way valve. After absorbing the heat of the compressed air, it returns to the heat pump unit.

[0040] The condensate from the air generated by the compressor interstage cryogenic cooler and the compressor interstage high-temperature cooler enters the compressor interstage cooler condensate tank; the condensate from the air generated by the high-pressure compressor outlet cryogenic cooler and the high-pressure compressor outlet high-temperature cooler enters the high-pressure compressor outlet cooler condensate tank; the condensate from the compressor interstage cooler condensate tank and the high-pressure compressor outlet cooler condensate tank is regulated and controlled to be preferentially used as thermal system makeup water entering the condenser. If the usage is sufficient for condenser makeup water, it enters the cooling tower as cooling tower makeup water. If the cooling tower makeup water is still insufficient to completely use the condensate from the cooler condensate tank, it is stored in a water storage tank as a backup water source for other purposes.

[0041] (2) When the grid load demand is high and the system is generating power, start the flue gas-air heat exchanger and air turbine power generation system, and shut down the compressed air energy storage system and flue gas waste heat utilization heat pump unit.

[0042] Open the valve group from compressed air storage device H to the flue gas / air heat exchanger system and the flue gas damper from the gas turbine exhaust to the flue gas / air heat exchanger system; close the inlet valve from the compressor to the compressed air storage chamber and the valve group from compressed air storage device H to the flue gas / air heat exchanger system; close the flue gas damper from the gas turbine exhaust to the waste heat boiler inlet; start the high-pressure air turbine and the low-pressure air turbine;

[0043] Part of the flue gas from the gas turbine generator set enters the flue gas / air low-temperature heat exchanger, the flue gas / air high-temperature heat exchanger, and the flue gas / air reheater. After heating the compressed air, it is cooled and returned to the waste heat boiler flue. After merging with the waste heat boiler flue gas, it is discharged into the atmosphere.

[0044] High-pressure, low-temperature compressed air from the compressed air storage device of the compressed air energy storage system is first heated by the flue gas / air low-temperature heat exchanger and the flue gas / air high-temperature heat exchanger, and its temperature rises to 500℃~540℃. It then enters the high-pressure air turbine to expand and do work, and its pressure and temperature decrease. The exhaust from the high-pressure air turbine enters the flue gas / air reheater to absorb heat from the flue gas, and its temperature rises to 500℃~540℃. It then enters the low-pressure air turbine to expand and do work, and its temperature drops to 35℃~45℃ before being discharged into the atmosphere.

[0045] (3) When the power grid has no requirements for deep peak shaving and full output, the system is in a static state, and the flue gas-air heat exchanger, air turbine power generation system, compressed air energy storage system and flue gas waste heat utilization heat pump unit are shut down; the system is in a normal combined cycle power generation state.

[0046] Open the flue gas damper from the gas turbine exhaust to the waste heat boiler inlet and the flue gas damper from the gas turbine exhaust to the flue gas / air heat exchanger system; close the flue gas damper from the gas turbine exhaust to the flue gas / air heat exchanger system, the valve group from the compressed air storage device H to the flue gas / air heat exchanger system, the inlet valve from the compressor to the compressed air storage chamber, the cooling tower circulating water supply valve to the medium-temperature water supply valve of the heat pump unit A, the medium-temperature water outlet valve from the heat pump unit A to the cooling tower return water valve, the inlet valve of the waste heat boiler flue gas waste heat recovery heat exchanger B, and the outlet valve of the waste heat boiler flue gas waste heat recovery heat exchanger B; shut down the high-pressure air turbine, low-pressure air turbine, low-pressure compressor, compressor drive motor, heat pump unit, compressor interstage high-temperature cooler circulating water pump, waste heat boiler flue gas waste heat recovery circulating pump, and heat pump unit to compressor interstage low-temperature cooler cooling circulating pump.

[0047] The present invention has at least the following beneficial technical effects:

[0048] (1) Under different operating conditions, the condensate in the compressed air is recycled and reused to replace part of the demineralized water system for the combined cycle unit condenser and cooling tower, thus saving system water resources.

[0049] (2) By coupling the combined cycle unit with the compressed air energy storage system, the overall power generation capacity of the system under peak grid conditions can be significantly increased.

[0050] (3) Under the deep peak shaving condition of the unit, the power generation of the combined cycle unit is significantly increased under the same power supply load, thereby significantly improving the operating efficiency of the combined cycle unit;

[0051] (4) Using waste heat boiler flue gas to heat compressed air can significantly increase the inlet main air temperature of air turbine generator set, thereby significantly improving the power generation cycle efficiency of air turbine generator set.

[0052] (5) Since the condensate of the combined cycle unit and the chilled water of the heat pump unit are used to cool the air at the compressor outlet, and the exhaust gas of the gas turbine is used to heat the compressed air to supply the air turbine, the operation flexibility of the compressed air energy storage system can be effectively guaranteed, and the problems of compressed air energy storage and power generation caused by poor grid dispatch and poor matching degree of heat storage device are eliminated.

[0053] (6) The combined cycle unit power supply system is used to supply power to the compressor of the compressed air energy storage system, thus reducing the power grid transmission loss and eliminating the compressor power supply transformer loss, thereby improving the net efficiency of the compressed air energy storage system.

[0054] (7) When the compressed air energy storage system is in energy storage mode, it can increase the temperature of the condensate of the waste heat boiler, thereby improving the efficiency of the combined cycle unit. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] A - Heat pump unit; B - Waste heat recovery heat exchanger for waste heat boiler flue gas; C - Waste heat recovery circulating pump for waste heat boiler flue gas; D - Condenser; E - Cooling circulating pump from heat pump unit to compressor interstage cryogenic cooler; F - Compressor interstage high-temperature cooler; G - Compressor interstage cryogenic cooler; H - Compressed air storage device; I - Flue gas / air cryogenic heat exchanger; J - Flue gas / air high-temperature heat exchanger; K - Flue gas / air reheater; L - Low-pressure air turbine; M - High-pressure air turbine; N - Air turbine generator; O - High-pressure compressor; P - Low-pressure compressor; Q - Compressor drive motor; R - Compressor interstage high-temperature cooler circulating water pump; S - Compressor interstage cooler condensate tank; T - High-pressure compressor outlet cryogenic cooler; U - High-pressure compressor outlet high-temperature cooler; V - High-pressure compressor outlet cooler condensate tank; W - Power supply line from gas turbine generator set's plant transformer to compressor drive motor; X - Water storage tank.

[0058] 1-Gas turbine exhaust to flue gas / air heat exchanger system flue gas damper; 2-Gas turbine exhaust to waste heat boiler inlet flue gas damper; 3-Compressed air storage device H to flue gas / air heat exchanger system valve group; 4-Compressor to compressed air storage chamber inlet valve; 5-Heat pump unit to compressor interstage cooler G water supply valve group; 6-Compressor interstage low-temperature cooler G to heat pump unit return water valve group; 7-Condensate to compressor interstage high-temperature cooler F water supply valve; 8-Compressor interstage high-temperature cooler F outlet water to waste heat boiler condensate system valve group; 9-Cooling tower circulating water supply to heat pump unit A medium-temperature water supply valve; 10-Heat pump unit A medium-temperature water outlet to cooling tower return water valve; 11-Waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve; 12-Waste heat boiler flue gas waste heat recovery... 13-Compressor interstage cooler drain tank S drains water to condenser valve assembly; 14-Compressor interstage cooler drain tank S drains water to cooling tower water tank valve assembly; 15-High pressure compressor outlet cooler V drains water to condenser valve assembly; 16-High pressure compressor outlet cooler V drains water to cooling tower water tank valve assembly; 17-Heat pump unit to high pressure compressor outlet cooler T water supply valve assembly; 18-High pressure compressor outlet low temperature cooler T to heat pump unit return water valve assembly; 19-Condensate to high pressure compressor outlet high temperature cooler U water supply valve; 20-High pressure compressor outlet high temperature cooler U outlet water to waste heat boiler condensate system valve assembly; 21-Compressor interstage cooler drain tank drains water to storage tank X valve assembly; 22-High pressure compressor outlet cooler drain tank V to storage tank X valve assembly. Detailed Implementation

[0059] The following detailed description, in conjunction with the accompanying drawings and examples, provides a further detailed explanation of a combined cycle unit coupled with compressed air energy storage system and its operation method according to the present invention.

[0060] Note 1: The combined cycle generator unit coupled with compressed air energy storage system described in this invention consists of a combined cycle generator unit, a flue gas waste heat utilization heat pump unit, and a compressed air energy storage system. The functions of each part are as follows:

[0061] Combined cycle generator sets are used to provide a driving heat source for flue gas waste heat utilization heat pump units, a driving power source for the compressors of compressed air energy storage systems, and a medium-temperature circulating cooling water source for flue gas waste heat utilization heat pump units, as well as a cooling water source for the high-temperature coolers between compressor stages and the high-temperature coolers at the outlet of high-pressure compressors, when grid load demand is low. When grid load demand is high, they provide high-temperature heated flue gas for flue gas-air heat exchanger air turbine power generation systems.

[0062] The flue gas waste heat utilization heat pump unit is used to absorb the waste heat from the combined cycle unit boiler as a driving heat source, and uses the medium-temperature circulating cooling water provided by the combined cycle generator unit to generate low-temperature chilled water, which provides cooling water for the compressor interstage cryogenic cooler and the high-pressure compressor outlet cryogenic cooler.

[0063] Compressed air energy storage systems are used to store compressed air when the grid load demand is low and the unit is operating under deep peak shaving conditions. A portion of the heat generated during air compression is transferred to the condensate of the combined cycle generator unit, improving the overall system efficiency. The condensate generated after air compression and cooling is used as makeup water for the condenser and cooling tower of the combined cycle generator unit. When the grid load demand is high, it provides high-pressure, low-temperature compressed air for power generation to the flue gas-air heat exchanger and air turbine power generation system.

[0064] The flue gas-air heat exchanger and air turbine power generation system heats the high-pressure compressed air provided by the compressed air energy storage system and the low-temperature reheated compressed air discharged from the high-pressure air turbine when the grid load demand is high. The compressed air expands in the air turbine to do work and output electrical energy.

[0065] Note 2: The combined cycle generator set coupled with compressed air energy storage system described in this invention includes a gas turbine generator set, a waste heat boiler system, and a steam turbine generator set. Wherein:

[0066] Gas turbine generator sets can use either natural gas or oil as fuel to provide heating flue gas for waste heat boiler systems and to provide heating flue gas for flue gas-air heat exchangers and air turbine power generation systems when grid load demand is high.

[0067] The waste heat boiler system utilizes high-temperature flue gas from the gas turbine generator set to heat low-temperature steam and water working fluids such as condensate and low-temperature reheat steam from the steam turbine generator set, providing high-temperature and high-pressure steam to the steam turbine generator set and discharging the flue gas into the atmosphere after reducing its temperature. The waste heat boiler system also heats the circulating water in the waste heat recovery heat exchanger of the waste heat boiler flue gas to provide a driving heat source for the waste heat utilization heat pump unit.

[0068] The steam turbine generator set generates electricity using high-temperature, high-pressure steam provided by the waste heat boiler, and provides the waste heat boiler with low-temperature steam and water working fluids such as condensate and low-temperature reheat steam; the steam turbine generator set provides medium-temperature circulating cooling water for the flue gas waste heat utilization heat pump unit; the steam turbine generator set provides cooling water for the high-temperature cooler between compressor stages and the high-temperature cooler at the outlet of the high-pressure compressor in the compressed air energy storage system.

[0069] Both gas turbine generator sets and steam turbine generator sets provide drive shaft power to the generator, and can be arranged either coaxially or separately.

[0070] Note 3: The main equipment of the flue gas waste heat recovery heat pump unit described in Note 1 includes: heat pump unit A, waste heat boiler flue gas waste heat recovery heat exchanger B, waste heat boiler flue gas waste heat recovery circulating pump C, as well as waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve 11 and waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve 12.

[0071] The connection method for each device is as follows: the outlet pipe of the waste heat recovery circulation pump C is connected to the inlet valve 11 of the waste heat recovery heat exchanger B; the outlet pipe of the inlet valve 11 of the waste heat recovery heat exchanger B is connected to the water-side inlet of the waste heat recovery heat exchanger B; the water-side outlet of the waste heat recovery heat exchanger B is connected to the outlet valve 12 of the waste heat recovery heat exchanger B; the outlet of the outlet valve 12 of the waste heat recovery heat exchanger B is connected to the inlet of the heat source driving unit A; and the outlet pipe of the heat source driving unit A is connected to the inlet of the waste heat recovery circulation pump C.

[0072] Note 4: The compressed air energy storage system described in Note 1 mainly includes: a compressed air storage device H, a high-pressure compressor O, a low-pressure compressor P, a compressor drive motor Q, a compressor interstage high-temperature cooler F, a compressor interstage low-temperature cooler G, a high-pressure compressor outlet low-temperature cooler T, a high-pressure compressor outlet high-temperature cooler U, a high-pressure compressor outlet cooler drain tank V and a water storage tank X, as well as valve group 3 from the compressed air storage device H to the flue gas / air heat exchanger system, inlet valve 4 from the compressor to the compressed air storage chamber, water supply valve group 5 from the heat pump unit to the compressor interstage cooler G, return water valve group 6 from the compressor interstage low-temperature cooler G to the heat pump unit, and drain tank S of the compressor interstage cooler. 13. Valve group 14. Valve group 15. Valve group 16. Valve group 17. Valve group 18. Valve group 19. Valve group 20. Valve group 21. Valve group 21. Valve group 22. Valve group 23. Valve group 24. Valve group 25. Valve group 26. Valve group 27. Valve group 18. Valve group 19. Valve group 20. Valve group 21. Valve group 22. Valve group 23. Valve group 24. Valve group 25. Valve group 26. Valve group 27. Valve group 28. Valve group 2 ...

[0073] The connection methods for each device are as follows:

[0074] The outlet pipe of the low-pressure compressor P is connected to the air-side inlet of the compressor interstage high-temperature cooler F. The air-side outlet of the compressor interstage high-temperature cooler F is connected to the air-side inlet of the compressor interstage low-temperature cooler G. The air-side outlet of the compressor interstage low-temperature cooler G is connected to the inlet of the high-pressure compressor O. The outlet of the high-pressure compressor O is connected to the air-side inlet of the high-pressure compressor outlet high-temperature cooler U. The air-side outlet of the high-pressure compressor outlet high-temperature cooler U is connected to the air-side inlet of the high-pressure compressor outlet low-temperature cooler T. The air-side outlet of the high-pressure compressor outlet low-temperature cooler T is connected to the compressor to compressed air storage chamber inlet valve 4. The outlet pipe of the compressor to compressed air storage chamber inlet valve 4 is connected to the compressed air storage device H. The outlet of the compressed air storage device H is connected to the valve group 3 of the compressed air storage device H to the flue gas / air heat exchanger system.

[0075] A tee is installed from the condensate pump outlet header of the turbine generator set, and branch pipes are connected to the inlet of the compressor interstage high-temperature cooler circulating water pump R. A tee is installed at the outlet of the compressor interstage high-temperature cooler circulating water pump R, and branch pipes are connected to the condensate supply valve 7 to the compressor interstage high-temperature cooler F and the condensate supply valve 19 to the high-pressure compressor outlet high-temperature cooler U. The outlet of the condensate supply valve 7 to the compressor interstage high-temperature cooler F is connected to the cooling water inlet of the compressor interstage high-temperature cooler F, and the outlet of the condensate supply valve 19 to the high-pressure compressor outlet high-temperature cooler U is connected to the... The outlet is connected to the high-temperature cooler U at the outlet of the high-pressure compressor. The cooling water side outlet of the high-temperature cooler F between compressor stages is connected to the valve group 8 of the valve group from the outlet of the high-temperature cooler F to the condensate system of the waste heat boiler. The cooling water side outlet of the high-temperature cooler U at the outlet of the high-pressure compressor is connected to the valve group 20 of the valve group from the outlet of the high-temperature cooler U at the outlet of the high-pressure compressor to the condensate system of the waste heat boiler. The outlets of the valve group 8 of the valve group from the outlet of the high-temperature cooler F between compressor stages to the condensate system of the waste heat boiler and the outlet of the valve group 20 of the valve group from the outlet of the high-temperature cooler U at the outlet of the high-pressure compressor to the condensate system of the waste heat boiler are both connected to the condensate pipeline of the combined cycle unit.

[0076] A pipe is connected from the chilled water outlet of heat pump unit A to the cooling circulation pump E of the interstage cryogenic cooler from the heat pump unit to the compressor. A tee is installed on the outlet pipe of the interstage cryogenic cooler E to connect branch pipes to the water supply valve group 5 from the heat pump unit to the interstage cooler G and the water supply valve group 17 from the heat pump unit to the high-pressure compressor outlet cooler T. The outlet of the water supply valve group 5 from the heat pump unit to the interstage cooler G is connected to the cooling water inlet of the interstage cryogenic cooler G. The outlet of the water supply valve group 17 from the heat pump unit to the high-pressure compressor outlet cooler T is connected to the cooling water inlet. The outlet is connected to the cooling water inlet of the high-pressure compressor outlet low-temperature cooler T. The cooling water outlet of the compressor interstage low-temperature cooler G is connected to the return water valve group 6 of the compressor interstage low-temperature cooler G to the heat pump unit. The cooling water outlet of the high-pressure compressor outlet low-temperature cooler T is connected to the return water valve group 18 of the high-pressure compressor outlet low-temperature cooler T to the heat pump unit. The outlet pipes of the compressor interstage low-temperature cooler G to the heat pump unit return water valve group 6 and the high-pressure compressor outlet low-temperature cooler T to the heat pump unit return water valve group 18 converge and are connected to the refrigerant water return port of the heat pump unit A.

[0077] The drain pipes of the compressor interstage cryogenic cooler G and the compressor interstage high-temperature cooler F are connected to the compressor interstage cooler drain tank S. The drain pipes of the high-pressure compressor outlet cryogenic cooler T and the high-pressure compressor outlet high-temperature cooler U are connected to the high-pressure compressor outlet cooler drain tank V. The first outlet of the compressor interstage cooler drain tank S is connected to the cooling tower water pool valve group 14, and the outlet of the cooling tower water pool valve group 14 is connected to the turbine generator set cooling tower makeup water. The second outlet of the compressor interstage cooler drain tank S is connected to the condenser valve group 13, and the outlet of the condenser valve group 13 is connected to the turbine generator set condenser makeup water. The third outlet of the compressor interstage cooler drain tank S is connected to the compressor interstage cooler drain tank... Water flows to the storage tank X valve group 21. The compressor interstage cooler drain tank drains water to the storage tank X valve group 21, which is connected to the storage tank X. The first outlet of the high-pressure compressor outlet cooler drain tank V is connected to the high-pressure compressor outlet cooler V drain water to the cooling tower water pool valve group 16. The outlet of the high-pressure compressor outlet cooler V drain water to the cooling tower water pool valve group 16 is connected to the turbine generator set cooling tower makeup water. The second outlet of the high-pressure compressor outlet cooler drain tank V is connected to the high-pressure compressor outlet cooler V drain water to the cooling tower water pool valve group 16. The outlet of the high-pressure compressor outlet cooler V drain water to the cooling tower water pool valve group 16 is connected to the turbine generator set condenser makeup water. The third outlet of the high-pressure compressor outlet cooler drain tank V is connected to the high-pressure compressor outlet cooler drain tank V to the storage tank X valve group 22. The high-pressure compressor outlet cooler drain tank V to the storage tank X valve group 22 is connected to the storage tank X.

[0078] Note 5: The flue gas-air heat exchanger and air turbine power generation system described in Note 1 mainly includes: flue gas / air low-temperature heat exchanger I, flue gas / air high-temperature heat exchanger J, flue gas / air reheater K, low-pressure air turbine L, high-pressure air turbine M, air turbine generator N, as well as flue gas damper 1 for gas turbine exhaust to flue gas / air heat exchanger system and flue gas damper 2 for gas turbine exhaust to waste heat boiler inlet.

[0079] The connection methods for each device are as follows:

[0080] The compressed air pipeline from the compressed air storage device H of the compressed air energy storage system to the outlet of the valve group 3 of the flue gas / air heat exchanger system is connected to the air-side inlet of the flue gas / air low-temperature heat exchanger I. The pipeline from the air-side outlet of the flue gas / air low-temperature heat exchanger I is connected to the air-side inlet of the flue gas / air high-temperature heat exchanger J. The pipeline from the air-side outlet of the flue gas / air high-temperature heat exchanger J is connected to the inlet valve of the high-pressure air turbine M of the air turbine generator set. The exhaust pipeline of the high-pressure air turbine M is connected to the air-side inlet of the flue gas / air reheater K. The air-side outlet of the flue gas / air reheater K is connected to the inlet valve of the low-pressure air turbine L. The exhaust of the low-pressure air turbine L is discharged into the atmosphere.

[0081] A three-way bypass flue is added to the exhaust flue of the gas turbine generator set, and a flue gas damper 1 is added to the gas turbine exhaust to the flue gas / air heat exchanger system. A flue gas damper 2 is added to the flue of the gas turbine exhaust to the waste heat boiler system. The exhaust gas from the gas turbine exhaust to the flue gas damper 1 enters the flue gas side inlet of the flue gas / air high-temperature heat exchanger J and the flue gas / air reheater K. The exhaust gas from the outlet of the flue gas / air high-temperature heat exchanger J and the flue gas / air reheater K enters the flue gas side inlet of the flue gas / air low-temperature heat exchanger I. The flue gas side outlet of the flue gas / air low-temperature heat exchanger I is connected to the tail flue of the waste heat boiler.

[0082] Note 6: The compressor drive motor Q in the compressed air energy storage system is powered by a switch and line W connected to the power bus of the gas turbine generator set or steam turbine generator set substation.

[0083] Note 7: The high-pressure compressor O and the low-pressure compressor P in the compressed air energy storage system can be arranged coaxially or separately. If a separate arrangement is adopted, an additional compressor drive motor is required.

[0084] Note 8: The compressed air storage device H added to the compressed air energy storage system can be a closed pressure salt cavern, a large-capacity artificial pressure vessel, or a sealed pressure cavern.

[0085] Note 9: The low-pressure air turbine L, high-pressure air turbine M, and air turbine generator N in the flue gas-air heat exchanger and air turbine power generation system are coaxially connected.

[0086] The operating method of a combined cycle unit coupled with compressed air energy storage system described in this invention is as follows under different operating conditions;

[0087] (1) When the power grid load demand is relatively low and energy storage is required, start the flue gas waste heat utilization heat pump unit and compressed air energy storage system, and shut down the flue gas-air heat exchanger and air turbine power generation system.

[0088] The main operations include: 1. Opening the flue gas damper from the gas turbine exhaust to the waste heat boiler inlet; 2. Opening the compressor inlet valve to the compressed air storage chamber; 3. Opening the water supply valve group from the heat pump unit to the compressor interstage cooler G; 4. Opening the return water valve group from the compressor interstage low-temperature cooler G to the heat pump unit; 5. Opening the condensate supply valve to the compressor interstage high-temperature cooler F; 6. Opening the valve group from the compressor interstage high-temperature cooler F outlet to the waste heat boiler condensate system; 7. Opening the valve group from the cooling tower circulating water supply to the heat pump unit A medium-temperature water supply valve; 8. Opening the valve from the heat pump unit A medium-temperature water outlet to the cooling tower return water valve; 9. Opening the valve from the waste heat boiler flue gas waste heat recovery heat exchanger B inlet; 10. Opening the valve from the waste heat boiler flue gas waste heat recovery heat exchanger B outlet; 11. Opening the valve from the waste heat boiler flue gas waste heat recovery heat exchanger B outlet. 1. Drain water from compressor interstage cooler condensate tank S to condenser valve group 13; 2. Drain water from compressor interstage cooler condensate tank S to cooling tower water tank valve group 14; 3. Drain water from high-pressure compressor outlet cooler V to condenser valve group 15; 4. Drain water from high-pressure compressor outlet cooler V to cooling tower water tank valve group 16; 5. Close gas turbine exhaust to flue gas / air heat exchanger system flue gas damper 1; 6. Compressed air storage device H to flue gas / air heat exchanger system valve group 3; 7. Start compressor interstage high-temperature cooler circulating water pump R; 8. Start waste heat boiler flue gas waste heat recovery circulating pump C; 9. Start heat pump unit A; 10. Start heat pump unit to compressor interstage low-temperature cooler cooling circulating pump E; 11. Start compressor drive motor Q.

[0089] Waste heat recovery circulation pump C of waste heat boiler flue gas delivers low-temperature waste heat utilization circulation water to waste heat recovery heat exchanger B of waste heat boiler flue gas. After absorbing heat and increasing temperature in waste heat recovery heat exchanger B, the low-temperature waste heat utilization circulation water returns to heat pump unit A to drive the heat pump unit to work.

[0090] Air enters the low-pressure compressor P, is compressed and its temperature rises to 200℃~350℃. After passing through the compressor interstage high-temperature cooler F and the compressor interstage low-temperature cooler G, the air is cooled to 25℃~40℃ and enters the high-pressure compressor O. After entering the high-pressure compressor O, the air is compressed and its temperature rises to ~120℃. After passing through the high-pressure compressor outlet high-temperature cooler U and the high-pressure compressor outlet low-temperature cooler U, the air is cooled to 25℃~40℃ and enters the compressed air storage device H.

[0091] Part of the low-temperature circulating water from the turbine generator set's cooling tower enters heat pump unit A to carry away the medium-temperature waste heat from the heat pump unit, and then returns to the cooling tower for cooling.

[0092] Condensate from the outlet pipe of the turbine generator set condensate pump is pressurized by the compressor interstage high-temperature cooler circulating water pump R and then enters the high-pressure compressor outlet high-temperature cooler U and the compressor interstage high-temperature cooler F through a three-way valve. After absorbing the heat of the compressed air, it returns to the condensate header.

[0093] The low-temperature chilled water from the heat pump unit is pressurized by the cooling circulation pump E of the compressor interstage cryogenic cooler after passing through the heat pump unit. It then enters the high-pressure compressor outlet cryogenic cooler T and the compressor interstage cryogenic cooler G through a three-way valve. After absorbing the heat from the compressed air, it returns to the heat pump unit A.

[0094] The condensate from the air generated by the compressor interstage cryogenic cooler G and the compressor interstage high-temperature cooler F enters the compressor interstage cooler condensate tank S; the condensate from the air generated by the high-pressure compressor outlet cryogenic cooler T and the high-pressure compressor outlet high-temperature cooler U enters the high-pressure compressor outlet cooler condensate tank V; the condensate from the compressor interstage cooler condensate tank S and the high-pressure compressor outlet cooler condensate tank V is regulated and controlled to be preferentially used as thermal system makeup water entering the condenser D. If the usage meets the condenser makeup water requirement, it enters the cooling tower as cooling tower makeup water. If the cooling tower makeup water is still insufficient to completely utilize the condensate from the cooler condensate tank V, it is stored in the water storage tank X as a backup water source for other purposes.

[0095] (2) When the grid load demand is high and air turbine power generation is required, start the flue gas-air heat exchanger and air turbine power generation system, and shut down the compressed air energy storage system and flue gas waste heat utilization heat pump unit.

[0096] The main operations include: opening the valve group 3 from the compressed air storage device H to the flue gas / air heat exchanger system valve group 3, and the flue gas damper 1 from the gas turbine exhaust to the flue gas / air heat exchanger system valve group 1; closing the compressor inlet valve 4 to the compressed air storage chamber valve group 3, and the valve group 3 from the compressed air storage device H to the flue gas / air heat exchanger system valve group 3; and partially closing the flue gas damper 2 from the gas turbine exhaust to the waste heat boiler inlet valve group 2. Starting the high-pressure air turbine M and the low-pressure air turbine L.

[0097] Part of the flue gas from the gas turbine generator set enters the flue gas / air low-temperature heat exchanger I, the flue gas / air high-temperature heat exchanger J, and the flue gas / air reheater K. After heating the compressed air, it is cooled and returned to the waste heat boiler flue. After merging with the waste heat boiler flue gas, it is discharged into the atmosphere.

[0098] High-pressure, low-temperature compressed air from the compressed air storage device H of the compressed air energy storage system is first heated by the flue gas / air low-temperature heat exchanger I and the flue gas / air high-temperature heat exchanger J, and its temperature rises to 500℃~540℃. It then enters the high-pressure air turbine M to expand and do work, and its pressure and temperature decrease. After the high-pressure air turbine M exhausts, it enters the flue gas / air reheater K to absorb heat from the flue gas, and its temperature rises to 500℃~540℃. It then enters the low-pressure air turbine L to expand and do work, and its temperature drops to 35℃~45℃ before being discharged into the atmosphere.

[0099] (3) When the power grid does not require deep peak shaving or full output, the system needs to be in a static state, and the flue gas-air heat exchanger, air turbine power generation system, compressed air energy storage system, and flue gas waste heat utilization heat pump unit should be shut down. The system should be in a normal combined cycle power generation state.

[0100] The main operations include: opening the gas turbine exhaust to the waste heat boiler inlet flue gas damper 2 and the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper 1; closing the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper 1, the compressed air storage device H to the flue gas / air heat exchanger system valve group 3, the compressor to the compressed air storage chamber inlet valve 4, the cooling tower circulating water supply to the heat pump unit A medium-temperature water supply valve 9, the heat pump unit A medium-temperature water outlet to the cooling tower return water valve 10, the waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve 11, and the waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve 12. Shutting down the high-pressure air turbine M, low-pressure air turbine L, low-pressure compressor P, compressor drive motor Q, heat pump unit A, compressor interstage high-temperature cooler circulating water pump R, waste heat boiler flue gas waste heat recovery circulating pump C, and heat pump unit to compressor interstage low-temperature cooler cooling circulating pump E.

[0101] Example illustration:

[0102] For a Class F combined cycle unit with a single-shaft configuration, the present invention is used to modify the unit by adding a waste heat recovery heat pump unit, a compressed air energy storage system, a flue gas-air heat exchanger, and an air turbine power generation system. The unit's operating parameters are shown in Table 1.

[0103] As can be seen from Table 1:

[0104] (1) Under different operating conditions, the condensate in the compressed air is recycled and reused, replacing the demineralized water system to make up 2.1 to 2.5 t / h of water for the condenser of the combined cycle unit;

[0105] (2) The combined cycle unit alone has a maximum output of 467MW. By adding a compressed air energy storage system, the overall power generation of the system increases to 495.2MW. The minimum power supply under deep peak shaving conditions is reduced by 49.74MW. Under the same power supply, the gas turbine load is significantly increased, thereby improving the operating efficiency of the combined cycle unit.

[0106] (3) The main air temperature of the air turbine generator set can reach 535℃ and the reheat air temperature can reach 532℃, which significantly improves the power generation cycle efficiency.

[0107] (4) Since the condensate of the combined cycle unit and the chilled water of the heat pump unit are used to cool the air at the compressor outlet, and the exhaust gas of the gas turbine is used to heat the compressed air to supply the air turbine, the operation flexibility of the compressed air energy storage system can be effectively guaranteed, and the problems of compressed air energy storage and power generation caused by poor grid dispatch and poor matching of heat storage devices are eliminated.

[0108] (5) The combined cycle unit plant power system is used to supply power to the compressor of the compressed air energy storage system, thus reducing the power grid transmission loss and eliminating the compressor power supply transformer loss, thereby improving the net efficiency of the compressed air energy storage system.

[0109] (6) When the compressed air energy storage system is in energy storage mode, it can increase the temperature of the condensate of the waste heat boiler, thereby improving the efficiency of the combined cycle unit.

[0110] Table 1. Main operating parameters of the combined cycle unit coupled compressed air energy storage system

[0111] parameter unit Energy storage status Power generation status static state Combined cycle unit power generation MW 186.8 445 350.25 Air turbine generator set power generation MW 0 50.2 0 compressor motor input power MW 49.74 0 0 Waste heat boiler flue gas temperature t / h 571.6 596.2 597.5 Low-pressure compressor inlet air pressure kPa 100.8 100.5 100.2 Low-pressure compressor inlet air temperature ℃ 27.2 26.3 26.7 Low-pressure compressor outlet air pressure MPa 6.258 - - Low-pressure compressor outlet air temperature ℃ 343 - - High pressure compressor inlet air pressure MPa 6.172 - - High-pressure compressor inlet air temperature ℃ 34.2 - - High pressure compressor outlet air pressure MPa 15.37 - - High-pressure compressor outlet air temperature ℃ 128 - - Compressed air storage device pressure MPa 15.31 14.68 15.27 Compressed air storage device temperature ℃ 34.1 33.5 33.9 Air turbine main gas pressure MPa - 14.52 - Air turbine main gas temperature ℃ - 535 - Air turbine reheat temperature ℃ - 532 - Flue gas / air high temperature heat exchanger flue gas inlet temperature ℃ - 595.2 - Flow rates of condensate tank V and condensate tank S to condenser makeup water t / h 2.1 2.5 2.2 Waste heat boiler low-pressure economizer inlet condensate temperature ℃ 43.8 27.5 27.3

[0112] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A system for coupled compressed air energy storage in a combined cycle unit, characterized in that, include: Combined cycle generator sets are used to provide a driving heat source for flue gas waste heat utilization heat pump units, a driving power source for the compressors of compressed air energy storage systems, and a medium-temperature circulating cooling water source for flue gas waste heat utilization heat pump units, as well as a cooling water source for the high-temperature coolers between compressor stages and the high-temperature coolers at the outlet of high-pressure compressors, when grid load demand is low. When grid load demand is high, they provide high-temperature heated flue gas for flue gas-air heat exchanger air turbine power generation systems. The flue gas waste heat utilization heat pump unit is used to absorb the waste heat from the combined cycle unit boiler as a driving heat source, and uses the medium-temperature circulating cooling water provided by the combined cycle generator unit to generate low-temperature chilled water to provide cooling water for the compressor interstage low-temperature cooler and the high-pressure compressor outlet low-temperature cooler. Compressed air energy storage systems are used to store compressed air under conditions of low grid load demand and deep peak shaving operation of generator units. A portion of the heat generated during air compression is transferred to the condensate of the combined cycle generator unit, improving overall system efficiency. The condensate generated after air compression and cooling serves as makeup water for the condenser and cooling tower of the combined cycle generator unit. When grid load demand is high, it provides high-pressure, low-temperature compressed air for power generation to the flue gas-air heat exchanger and air turbine power generation system. The flue gas-air heat exchanger and air turbine power generation system heats the high-pressure compressed air provided by the compressed air energy storage system and the low-temperature reheated compressed air discharged from the high-pressure air turbine when the grid load demand is high, and expands in the air turbine to do work and output electrical energy. Combined cycle generator sets include gas turbine generator sets, waste heat boiler systems, and steam turbine generator sets; Gas turbine generator sets use gas or oil as fuel to provide heated flue gas for waste heat boiler systems and to provide heated flue gas for flue gas-air heat exchangers and air turbine power generation systems when grid load demand is high. The waste heat boiler system utilizes high-temperature flue gas from the gas turbine generator set to heat condensate and low-temperature reheat steam from the steam turbine generator set, providing high-temperature, high-pressure steam to the steam turbine generator set and discharging the flue gas into the atmosphere after reducing its temperature. The waste heat boiler system also heats the circulating water in the waste heat recovery heat exchanger of the waste heat boiler flue gas to provide a driving heat source for the waste heat utilization heat pump unit. The steam turbine generator set generates electricity using high-temperature, high-pressure steam provided by the waste heat boiler, and provides condensate and low-temperature reheat steam to the waste heat boiler; the steam turbine generator set provides medium-temperature circulating cooling water to the flue gas waste heat utilization heat pump unit; the steam turbine generator set provides cooling water to the high-temperature cooler between compressor stages and the high-temperature cooler at the outlet of the high-pressure compressor in the compressed air energy storage system. Both gas turbine generator sets and steam turbine generator sets provide drive shaft power to the generator; The waste heat recovery heat pump unit includes: heat pump unit A, waste heat boiler flue gas waste heat recovery heat exchanger B, waste heat boiler flue gas waste heat recovery circulating pump C, waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve (11) and waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve (12). The outlet pipe of the waste heat recovery circulation pump C is connected to the inlet valve (11) of the waste heat recovery heat exchanger B; the outlet pipe of the inlet valve (11) of the waste heat recovery heat exchanger B is connected to the water-side inlet of the waste heat recovery heat exchanger B; the water-side outlet of the waste heat recovery heat exchanger B is connected to the outlet valve (12) of the waste heat recovery heat exchanger B; the outlet of the outlet valve (12) of the waste heat recovery heat exchanger B is connected to the inlet of the heat pump unit A drive heat source; the outlet pipe of the heat pump unit A drive heat source is connected to the inlet of the waste heat recovery circulation pump C.

2. The system for coupled compressed air energy storage in a combined cycle unit according to claim 1, characterized in that, The compressed air energy storage system includes: a compressed air storage device H, a high-pressure compressor O, a low-pressure compressor P, a compressor drive motor Q, a compressor interstage high-temperature cooler F, a compressor interstage low-temperature cooler G, a high-pressure compressor outlet low-temperature cooler T, a high-pressure compressor outlet high-temperature cooler U, a high-pressure compressor outlet cooler drain tank V and a water storage tank X, as well as a valve group (3) from the compressed air storage device H to the flue gas / air heat exchanger system, a compressor to the compressed air storage chamber inlet valve (4), a heat pump unit to the compressor interstage cooler G water supply valve group (5), a compressor interstage low-temperature cooler G to the heat pump unit return water valve group (6), and a valve group (13) from the compressor interstage cooler drain tank S to the condenser. The valve group for draining water from the compressor interstage cooler condensate tank S to the cooling tower water pool is (14); the valve group for draining water from the high-pressure compressor outlet cooler V to the condenser is (15); the valve group for draining water from the high-pressure compressor outlet cooler V to the cooling tower water pool is (16); the valve group for supplying water from the heat pump unit to the high-pressure compressor outlet cooler T is (17); the valve group for returning water from the high-pressure compressor outlet low-temperature cooler T to the heat pump unit is (18); the valve group for supplying condensate to the high-pressure compressor outlet high-temperature cooler U is (19); the valve group for supplying water from the high-pressure compressor outlet high-temperature cooler U to the waste heat boiler condensate system is (20); the valve group for draining water from the compressor interstage cooler condensate tank to the storage tank X is (21); and the valve group for draining water from the high-pressure compressor outlet cooler V to the storage tank X is (22). The outlet pipe of the low-pressure compressor P is connected to the air side inlet of the compressor interstage high-temperature cooler F. The air side outlet of the compressor interstage high-temperature cooler F is connected to the air side inlet of the compressor interstage low-temperature cooler G. The air side outlet of the compressor interstage low-temperature cooler G is connected to the inlet of the high-pressure compressor O. The outlet of the high-pressure compressor O is connected to the air side inlet of the high-pressure compressor outlet high-temperature cooler U. The air side outlet of the high-pressure compressor outlet high-temperature cooler U is connected to the air side inlet of the high-pressure compressor outlet low-temperature cooler T. The air side outlet of the high-pressure compressor outlet low-temperature cooler T is connected to the compressor to compressed air storage chamber inlet valve (4). The outlet pipe of the compressor to compressed air storage chamber inlet valve (4) is connected to the compressed air storage device H. The outlet of the compressed air storage device H is connected to the compressed air storage device H to flue gas / air heat exchanger system valve group (3). A tee is installed from the condensate pump outlet of the turbine generator set, and branch pipes are connected to the inlet of the compressor interstage high-temperature cooler circulating water pump R. A tee is installed from the outlet of the compressor interstage high-temperature cooler circulating water pump R, and branch pipes are connected to the condensate to the compressor interstage high-temperature cooler F water supply valve (7). The compressor interstage high-temperature cooler F outlet water to the waste heat boiler condensate system valve group (8) and the condensate to the high-pressure compressor outlet high-temperature cooler U water supply valve (19) are connected. The outlet of the condensate to the compressor interstage high-temperature cooler F water supply valve (7) is connected to the cooling water side inlet of the compressor interstage high-temperature cooler F. The condensate to the high-pressure compressor outlet high-temperature cooler... The outlet of the high-temperature cooler U supply valve (19) is connected to the outlet of the high-temperature cooler U of the high-pressure compressor. The outlet of the high-temperature cooler F between compressor stages is connected to the valve group (8) of the outlet of the high-temperature cooler F between compressor stages to the condensate system of the waste heat boiler. The outlet of the high-temperature cooler U at the outlet of the high-pressure compressor is connected to the valve group (20) of the outlet of the high-temperature cooler U at the outlet of the high-pressure compressor to the condensate system of the waste heat boiler. The outlets of the valve group (8) of the outlet of the high-temperature cooler F between compressor stages to the condensate system of the waste heat boiler and the outlet of the valve group (20) of the high-temperature cooler U at the outlet of the high-pressure compressor to the condensate system of the waste heat boiler are both connected to the condensate pipeline of the combined cycle unit. A pipe is connected from the chilled water outlet of heat pump unit A to the cooling circulation pump E of the interstage cryogenic cooler from the heat pump unit to the compressor. A tee is installed on the outlet pipe of the interstage cryogenic cooler cooling circulation pump E to connect branch pipes to the water supply valve group (5) from the heat pump unit to the interstage cooler G and the water supply valve group (17) from the heat pump unit to the high-pressure compressor outlet cooler T. The outlet of the water supply valve group (5) from the heat pump unit to the interstage cooler G is connected to the cooling water inlet of the interstage cryogenic cooler G. The outlet of the water supply valve group (17) from the heat pump unit to the high-pressure compressor outlet cooler T is connected to the outlet pipe. The outlet is connected to the cooling water inlet of the high-pressure compressor outlet low-temperature cooler T, the cooling water outlet of the compressor interstage low-temperature cooler G is connected to the return water valve group (6) of the compressor interstage low-temperature cooler G to the heat pump unit, the cooling water outlet of the high-pressure compressor outlet low-temperature cooler T is connected to the return water valve group (18) of the high-pressure compressor outlet low-temperature cooler T to the heat pump unit, and the outlet pipes of the compressor interstage low-temperature cooler G to the heat pump unit return water valve group (6) and the high-pressure compressor outlet low-temperature cooler T to the heat pump unit return water valve group (18) are connected to the cooling water return port of the heat pump unit A after they are joined. The drain pipes of the compressor interstage cryogenic cooler G and the compressor interstage high-temperature cooler F are connected to the compressor interstage cooler drain tank S. The drain pipes of the high-pressure compressor outlet cryogenic cooler T and the high-pressure compressor outlet high-temperature cooler U are connected to the high-pressure compressor outlet cooler drain tank V. The first outlet of the compressor interstage cooler drain tank S is connected to the compressor interstage cooler drain tank S drain water to the cooling tower water pool valve group (14). The outlet of the compressor interstage cooler drain tank S drain water to the cooling tower water pool valve group (14) is connected to the turbine generator cooling tower makeup water. The second outlet of the compressor interstage cooler drain tank S drain water to the condenser valve group (13). The outlet of the compressor interstage cooler drain tank S drain water to the condenser valve group (13) is connected to the turbine generator condenser makeup water. The third outlet of the compressor interstage cooler drain tank S drain water to the compressor interstage cooler drain tank water storage tank. The X valve group (21) of the compressor interstage cooler drain tank is connected to the water storage tank X. The first outlet of the high pressure compressor outlet cooler drain tank V is connected to the high pressure compressor outlet cooler V drain to the cooling tower water pool valve group (16). The outlet of the high pressure compressor outlet cooler V drain to the cooling tower water pool valve group (16) is connected to the steam turbine generator set cooling tower makeup water. The second outlet of the high pressure compressor outlet cooler drain tank V is connected to the high pressure compressor outlet cooler V drain to the cooling tower water pool valve group (16). The outlet of the high pressure compressor outlet cooler V drain to the cooling tower water pool valve group (16) is connected to the steam turbine generator set condenser makeup water. The third outlet of the high pressure compressor outlet cooler drain tank V is connected to the high pressure compressor outlet cooler drain tank V to the water storage tank X valve group (22). The high pressure compressor outlet cooler drain tank V to the water storage tank X valve group (22) is connected to the water storage tank X.

3. A combined cycle unit coupled with compressed air energy storage system according to claim 2, characterized in that, The flue gas-air heat exchanger and air turbine power generation system includes: flue gas / air low temperature heat exchanger I, flue gas / air high temperature heat exchanger J, flue gas / air reheater K, low pressure air turbine L, high pressure air turbine M, air turbine generator N, and gas turbine exhaust to flue gas / air heat exchanger system flue gas baffle (1) and gas turbine exhaust to waste heat boiler inlet flue gas baffle (2). The compressed air pipeline from the compressed air storage device H of the compressed air energy storage system to the outlet of the valve group (3) of the flue gas / air heat exchanger system is connected to the air side inlet of the flue gas / air low temperature heat exchanger I, and from the air side outlet of the flue gas / air low temperature heat exchanger I to the air side inlet of the flue gas / air high temperature heat exchanger J, and from the air side outlet of the flue gas / air high temperature heat exchanger J to the air turbine generator set high pressure air turbine M intake valve, the high pressure air turbine M exhaust pipeline is connected to the air side inlet of the flue gas / air reheater K, the air side outlet of the flue gas / air reheater K is connected to the low pressure air turbine L intake valve, and the low pressure air turbine L exhaust is discharged into the atmosphere; A three-way bypass flue is added to the exhaust flue of the gas turbine generator set, and a flue gas damper (1) is added to the gas turbine exhaust to the flue gas / air heat exchanger system. A flue gas damper (2) is added to the flue of the gas turbine exhaust to the waste heat boiler system. The exhaust gas from the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper (1) enters the flue gas side inlet of the flue gas / air high temperature heat exchanger J and the flue gas / air reheater K. The exhaust gas from the flue gas / air high temperature heat exchanger J and the flue gas / air reheater K enters the flue gas side inlet of the flue gas / air low temperature heat exchanger I. The flue gas side outlet of the flue gas / air low temperature heat exchanger I is connected to the tail flue of the waste heat boiler.

4. A combined cycle unit coupled with compressed air energy storage system according to claim 3, characterized in that, The compressor drive motor Q in the compressed air energy storage system is powered by a switch and line W connected to the power bus of the gas turbine generator set or steam turbine generator set substation.

5. A combined cycle unit coupled with compressed air energy storage system according to claim 3, characterized in that, In the compressed air energy storage system, the high-pressure compressor O and the low-pressure compressor P are arranged coaxially or separately. If they are arranged separately, an additional compressor drive motor is added.

6. A combined cycle unit coupled with compressed air energy storage system according to claim 3, characterized in that, The compressed air storage device H added to the compressed air energy storage system adopts a closed pressure salt cavern, a large-capacity artificial pressure vessel, or a sealed pressure cavern.

7. A combined cycle unit coupled with compressed air energy storage system according to claim 3, characterized in that, The low-pressure air turbine L, high-pressure air turbine M, and air turbine generator N in the flue gas-air heat exchanger and air turbine power generation system are coaxially connected.

8. The operating method of a combined cycle unit coupled with compressed air energy storage system as described in claim 3, characterized in that, include; (1) When the power grid load demand is low and deep peak shaving is in place, the system is in the energy storage state, the flue gas waste heat utilization heat pump unit and compressed air energy storage system are started, and the flue gas-air heat exchanger and air turbine power generation system are shut down. Open the gas turbine exhaust to the waste heat boiler inlet flue gas damper (2), the compressor to the compressed air storage chamber inlet valve (4), the heat pump unit to the compressor interstage cooler G water supply valve group (5), the compressor interstage low temperature cooler G to the heat pump unit return water valve group (6), the condensate to the compressor interstage high temperature cooler F water supply valve (7), the compressor interstage high temperature cooler F outlet water to the waste heat boiler condensate system valve group (8), the cooling tower circulating water supply to the heat pump unit A medium temperature water supply valve (9), the heat pump unit A medium temperature water outlet to the cooling tower return water valve (10), the waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve (11), the waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve (12) ), ), the compressor interstage cooler drain tank S drains water to the condenser valve group (13), the compressor interstage cooler drain tank S drains water to the cooling tower water pool valve group (14), the high pressure compressor outlet cooler V drains water to the condenser valve group (15) and the high pressure compressor outlet cooler V drains water to the cooling tower water pool valve group (16); close the gas turbine exhaust to the flue gas / air heat exchanger system flue gas baffle (1), the compressed air storage device H to the flue gas / air heat exchanger system valve group (3); start the compressor interstage high temperature cooler circulating water pump R, start the waste heat boiler flue gas waste heat recovery circulating pump C, start the heat pump unit A, start the heat pump unit to the compressor interstage low temperature cooler cooling circulation pump E, and start the compressor drive motor Q; Waste heat recovery circulation pump C delivers low-temperature waste heat utilization circulating water to waste heat recovery heat exchanger B. After absorbing heat and increasing temperature in waste heat recovery heat exchanger B, the low-temperature waste heat utilization circulating water returns to heat pump unit A to drive the heat pump unit to work. Air enters the low-pressure compressor P and is compressed, increasing its pressure and temperature to 200℃~350℃. After passing through the compressor stage high-temperature cooler F and the compressor stage low-temperature cooler G, the air is cooled to 25℃~40℃ and enters the high-pressure compressor O. After entering the high-pressure compressor O, the air is compressed, increasing its pressure and temperature to ~120℃. After passing through the high-pressure compressor outlet high-temperature cooler U and the high-pressure compressor outlet low-temperature cooler U, the air is cooled to 25℃~40℃ and enters the compressed air storage device H. Part of the low-temperature circulating water from the turbine generator set cooling tower enters heat pump unit A to carry away the medium-temperature waste heat of the heat pump unit, and returns to the cooling tower for cooling. Condensate from the outlet pipe of the steam turbine generator set condensate pump is pressurized by the compressor interstage high temperature cooler circulating water pump R and then enters the high pressure compressor outlet high temperature cooler U and the compressor interstage high temperature cooler F through a three-way valve. After absorbing the heat of the compressed air, it returns to the condensate header. The low-temperature chilled water from the heat pump unit is pressurized by the heat pump unit to the compressor interstage cryogenic cooler supply circulation pump E, and then enters the high-pressure compressor outlet cryogenic cooler T and the compressor interstage cryogenic cooler G through a three-way valve. After absorbing the heat of the compressed air, it returns to the heat pump unit A. The condensate from the air generated by the compressor interstage low-temperature cooler G and the compressor interstage high-temperature cooler F enters the compressor interstage cooler condensate tank S; the condensate from the air generated by the high-pressure compressor outlet low-temperature cooler T and the high-pressure compressor outlet high-temperature cooler U enters the high-pressure compressor outlet cooler condensate tank V; the condensate from the compressor interstage cooler condensate tank S and the high-pressure compressor outlet cooler condensate tank V is regulated and controlled by the compressor interstage cooler condensate tank S to the condenser valve group (13), the compressor interstage cooler condensate tank S to the cooling tower water pool valve group (14), the high-pressure compressor outlet cooler V to the condenser valve group (15), and the high-pressure compressor outlet cooler V to the cooling tower water pool valve group (16), and is preferentially used as thermal system makeup water to enter the condenser D. If the usage meets the condenser makeup water requirement, it enters the cooling tower as cooling tower makeup water. If the cooling tower makeup water is still insufficient to completely use the condensate from the cooler condensate tank V, it is stored in the water storage tank X as a backup water source for other purposes. (2) When the grid load demand is high and the system is in power generation mode, start the flue gas-air heat exchanger and air turbine power generation system, and shut down the compressed air energy storage system and flue gas waste heat utilization heat pump unit. Open the valve group (3) from the compressed air storage device H to the flue gas / air heat exchanger system, and the flue gas damper (1) from the gas turbine exhaust to the flue gas / air heat exchanger system; close the inlet valve (4) from the compressor to the compressed air storage chamber, and the valve group (3) from the compressed air storage device H to the flue gas / air heat exchanger system; close the flue gas damper (2) from the gas turbine exhaust to the waste heat boiler inlet; start the high-pressure air turbine M and the low-pressure air turbine L; Part of the flue gas from the gas turbine generator set enters the flue gas / air low-temperature heat exchanger I, the flue gas / air high-temperature heat exchanger J, and the flue gas / air reheater K. After heating the compressed air, it is cooled and returned to the waste heat boiler flue. After merging with the waste heat boiler flue gas, it is discharged into the atmosphere. High-pressure, low-temperature compressed air from the compressed air storage device H of the compressed air energy storage system is first heated by the flue gas / air low-temperature heat exchanger I and the flue gas / air high-temperature heat exchanger J, and its temperature rises to 500℃~540℃. It then enters the high-pressure air turbine M to expand and do work, and its pressure and temperature decrease. After the high-pressure air turbine M exhausts, it enters the flue gas / air reheater K to absorb heat from the flue gas, and its temperature rises to 500℃~540℃. It then enters the low-pressure air turbine L to expand and do work, and its temperature drops to 35℃~45℃ before being discharged into the atmosphere. (3) When the power grid has no deep peak shaving and full output requirements, the system is in a static state, and the flue gas-air heat exchanger, air turbine power generation system, compressed air energy storage system and flue gas waste heat utilization heat pump unit are shut down; the system is in a normal combined cycle power generation state. Open the gas turbine exhaust to the waste heat boiler inlet flue gas damper (2), gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper (1); close the gas turbine exhaust to the flue gas / air heat exchanger system flue gas damper (1), compressed air storage device H to the flue gas / air heat exchanger system valve group (3), compressor to compressed air storage chamber inlet valve (4), cooling tower circulating water supply to heat pump unit A medium temperature water supply valve (9), heat pump unit A medium temperature water outlet to cooling tower return water valve (10), waste heat boiler flue gas waste heat recovery heat exchanger B inlet valve (11), waste heat boiler flue gas waste heat recovery heat exchanger B outlet valve (12); shut down the high pressure air turbine M, low pressure air turbine L, low pressure compressor P, compressor drive motor Q, heat pump unit A, compressor interstage high temperature cooler circulating water pump R, waste heat boiler flue gas waste heat recovery circulating pump C, and heat pump unit to compressor interstage low temperature cooler cooling circulating pump E.

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