Compressed air energy storage power generation system

Abstract

The utility model belongs to the technical field of comprehensive energy utilization, and particularly discloses a compressed air energy storage power generation system which comprises a motor, a compressor, an expansion machine, a power generator, a heat accumulator and an air storage chamber and further comprises a cold accumulator, the motor is connected with the compressor, and an air inlet of the compressor is communicated with a first air outlet of the cold accumulator. A first air inlet of the regenerator is communicated with external air, an air outlet of the compressor is communicated with a first air inlet of the heat accumulator, a first air outlet of the heat accumulator is communicated with an air inlet of the air storage chamber, an air outlet of the air storage chamber is communicated with a second air inlet of the heat accumulator, and a second air outlet of the heat accumulator is communicated with an air inlet of the expansion machine. An air outlet of the expansion machine is communicated with a second air inlet of the regenerator, a second air outlet of the regenerator is communicated with external air, and the expansion machine is connected with the generator. The peak regulation requirement of an electric power system is met, and the electric energy consumption of the motor is reduced. The peak regulation device is suitable for peak regulation of an electric power system.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive energy utilization, and specifically relates to a compressed air energy storage power generation system. Background Technique

[0002] The compressed air energy storage technology is a power energy storage system that can achieve large-capacity and long-term electric energy storage. An air compressor is driven by an electric motor to compress air into a large sealed space serving as an air storage chamber, that is, the non-storable electric energy is converted into the pneumatic potential energy of storable compressed air and stored in the air storage chamber; when the power system is at the peak load, the compressed air is introduced into an expander to do work and generate electricity to meet the peak shaving needs of the power system.

[0003] For a traditional compressed air energy storage system, for example, a Chinese patent with the publication number CN104675464A discloses a compressed air energy storage system. This compressed air energy storage system adopts the staged operation of a compressor and an expander, enabling the cascade utilization of the pressure energy of the air in the air storage chamber, improving the operation efficiency of the compressor during energy storage, and reducing the pressure energy loss during energy release. However, the expander converts high-pressure compressed air into a high-speed air flow, drives the generator to rotate and generate electricity, and discharges low-temperature air. The cold energy of the discharged air is not fully utilized, resulting in waste of resources. Content of the Utility Model

[0004] The purpose of the utility model is to provide a compressed air energy storage power generation system to fully utilize the cold energy generated during the expansion process and reduce the electric energy consumption of the electric motor.

[0005] The technical method adopted by the utility model to achieve the above purpose is as follows:

[0006] A compressed air energy storage power generation system includes an electric motor, a compressor, an expander, a generator, a heat accumulator, and an air storage chamber. It also includes a cold accumulator. The electric motor is connected to the compressor. The air inlet of the compressor is communicated with the first air outlet of the cold accumulator. The first air inlet of the cold accumulator is communicated with the external air. The air outlet of the compressor is communicated with the first air inlet of the heat accumulator. The first air outlet of the heat accumulator is communicated with the air inlet of the air storage chamber. The air outlet of the air storage chamber is communicated with the second air inlet of the heat accumulator. The second air outlet of the heat accumulator is communicated with the air inlet of the expander. The air outlet of the expander is communicated with the second air inlet of the cold accumulator. The second air outlet of the cold accumulator is communicated with the external air. The expander is connected to the generator.

[0007] As defined: A compressed air energy storage power generation system further includes a heat exchanger, a water storage tank, and a solar collector. The solar collector is connected to an external water source. The water inlet of the solar collector is connected to the first water outlet of the water storage tank, and the water outlet of the solar collector is connected to the first water inlet of the water storage tank. The second water outlet of the water storage tank is connected to the water inlet of the heat exchanger, and the second water inlet of the water storage tank is connected to the water outlet of the heat exchanger. The second gas outlet of the heat accumulator is connected to the gas inlet of the expander through the heat exchanger.

[0008] As defined: The third gas outlet of the heat accumulator is connected to the heating unit of an external air conditioning system to provide heat source for the external air conditioning system. The third gas outlet of the cold accumulator is connected to the refrigeration unit of the external air conditioning system to provide cold source for the external air conditioning system.

[0009] As further defined: Both the third water outlet and the third water inlet of the water storage tank are connected to an external heat-using system to provide heat source for the external heat-using system.

[0010] As further defined: The outer wall of the gas storage chamber is provided with a heat insulation layer.

[0011] Due to the adoption of the above scheme, the beneficial effects obtained by the present utility model compared with the prior art are as follows:

[0012] (1) For a compressed air energy storage power generation system provided by the present utility model, by setting a motor, a compressor, an expander, a generator, a heat accumulator, a gas storage chamber, and a cold accumulator, the compressor compresses air, and the compressed air enters the expander to do work and generate electricity, meeting the peak shaving needs of the power system. The low-temperature gas discharged from the expander exchanges heat with the cold accumulator, and the cold accumulator stores cold to cool the air entering the compressor, reducing the power consumption of the motor.

[0013] (2) For a compressed air energy storage power generation system provided by the present utility model, by setting a heat exchanger, a water storage tank, and a solar collector, the solar collector uses solar energy to heat the water in the water storage tank, and the water in the water storage tank exchanges heat through the heat exchanger. The heat exchanger heats the gas discharged from the heat accumulator, compensating for the heat loss of the heat accumulator, further increasing the temperature of the gas entering the expander, and improving the power generation efficiency.

[0014] (3) For a compressed air energy storage power generation system provided by the present utility model, the heat accumulator and the cold accumulator can provide heat source and cold source for an external air conditioning system, and the water storage tank can provide heat source for an external heat-using system, improving the comprehensive utilization efficiency of energy.

[0015] (4) For a compressed air energy storage power generation system provided by the present utility model, by setting a heat insulation layer on the outer wall of the gas storage chamber, the gas storage chamber has the function of heat insulation, reducing the heat loss of the compressed air during storage and improving the thermal efficiency of the system.

[0016] The utility model is applicable to peak shaving of power systems. Description of the Drawings

[0017] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0018] Figure 1 It is a schematic structural diagram of a compressed air energy storage power generation system according to an embodiment of the present utility model;

[0019] In the figure: 1, motor; 2, compressor; 3, expander; 4, generator; 5, heat accumulator; 6, gas storage chamber; 7, heat exchanger; 8, water storage tank; 9, solar collector; 10, cold accumulator; 11, heat utilization system; 12, air conditioning system. Specific Embodiments

[0020] The present utility model will be further described below in conjunction with the embodiments. Those skilled in the art should understand that the present utility model is not limited to the following embodiments, and any improvements and equivalent changes made on the basis of the specific embodiments of the present utility model are within the scope of protection of the claims of the present utility model.

[0021] Embodiment A compressed air energy storage power generation system

[0022] A compressed air energy storage power generation system, as Figure 1As shown in the figure, it includes a motor 1, a compressor 2, an expander 3, a generator 4, a heat accumulator 5, a gas storage chamber 6, a cold accumulator 10, a heat exchanger 7, a water storage tank 8, and a solar collector 9. The motor 1 is connected to the compressor 2. The intake port of the compressor 2 is communicated with the first outlet of the cold accumulator 10. The first intake port of the cold accumulator 10 is communicated with the external air. The first intake port and the first outlet of the cold accumulator 10 are communicated inside the cold accumulator 10. The outlet of the compressor 2 is communicated with the first intake port of the heat accumulator 5. The first outlet of the heat accumulator 5 is communicated with the intake port of the gas storage chamber 6. The first intake port and the first outlet of the heat accumulator 5 are communicated inside the heat accumulator 5. The outer wall of the gas storage chamber 6 is provided with a heat insulation layer. The outlet of the gas storage chamber 6 is communicated with the second intake port of the heat accumulator 5. The second outlet of the heat accumulator 5 is communicated with the intake port of the expander 3 through the heat exchanger 7. The second intake port and the second outlet of the heat accumulator 5 are communicated inside the heat accumulator 5. The outlet of the expander 3 is communicated with the second intake port of the cold accumulator 10. The second outlet of the cold accumulator 10 is communicated with the external air. The second intake port and the second outlet of the cold accumulator 10 are communicated inside the cold accumulator 10. The expander 3 is connected to the generator 4. The solar collector 9 is communicated with the external water source. The water inlet of the solar collector 9 is communicated with the first water outlet of the water storage tank 8. The water outlet of the solar collector 9 is communicated with the first water inlet of the water storage tank 8. The second water outlet of the water storage tank 8 is communicated with the water inlet of the heat exchanger. The second water inlet of the water storage tank 8 is communicated with the water outlet of the heat exchanger. The water inlet and the water outlet of the heat exchanger are communicated inside the heat exchanger. The third outlet of the heat accumulator 5 is communicated with the heating unit of the external air conditioning system 12. The third outlet and the second outlet of the heat accumulator 5 are communicated inside the heat accumulator 5 to provide a heat source for the air conditioning system 12. The third outlet of the cold accumulator 10 is communicated with the refrigeration unit of the external air conditioning system 12. The third outlet and the first outlet of the cold accumulator 10 are communicated inside the cold accumulator 10 to provide a cold source for the air conditioning system 12. The third water outlet and the third water inlet of the water storage tank 8 are both communicated with the external heat using system 11 to provide a heat source for the heat using system 11.

[0023] When the compressed air energy storage power generation system of this embodiment is in use, air enters the compressor 2 through the cold accumulator 10. The motor 1 provides power for the compressor 2. The compressor 2 compresses the air to form a high-temperature and high-pressure gas. The high-temperature and high-pressure gas exchanges heat with the heat accumulator 5 and is stored in the gas storage chamber 6 after the heat exchange. The heat accumulator 5 stores heat. When power generation is required, the high-pressure gas in the gas storage chamber 6 exchanges heat with the heat accumulator 5 to form a high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the expander 3 through the heat exchanger 7. The high-temperature and high-pressure gas does work in the expander 3, driving the generator 4 to rotate and generate electricity, and discharging low-temperature gas. The low-temperature gas is discharged after heat exchange through the cold accumulator 10. The cold accumulator 10 stores cold energy to cool the air entering the compressor 2, reducing the power consumption of the motor 1; the solar collector 9 uses solar energy to heat the water in the water storage tank 8. The water in the water storage tank 8 exchanges heat through the heat exchanger 7. The heat exchanger 7 heats the gas discharged from the heat accumulator 5, compensating for the heat loss of the heat accumulator 5, further increasing the temperature of the gas entering the expander 3 and improving the power generation efficiency. Both the heat accumulator 5 and the cold accumulator 10 are connected to the external air-conditioning system 12. When the power demand is low, they can provide heat source and cold source for the external air-conditioning system 12. The water storage tank 8 is connected to the external heat-using system 11 and can provide heat source according to the demand of the external heat-using system 11.

Claims

1. A compressed air energy storage power generation system, comprising a motor, a compressor, an expander, a generator, a heat accumulator and an air storage chamber, characterized in that: It also includes a cold storage device, an electric motor connected to a compressor, an air inlet of the compressor connected to a first air outlet of the cold storage device, the first air inlet of the cold storage device connected to external air, an air outlet of the compressor connected to a first air inlet of the heat storage device, the first air outlet of the heat storage device connected to an air inlet of an air storage chamber, an air outlet of the air storage chamber connected to a second air inlet of the heat storage device, the second air outlet of the heat storage device connected to an air inlet of an expander, an air outlet of the expander connected to a second air inlet of the cold storage device, the second air outlet of the cold storage device connected to external air, and the expander connected to a generator.

2. A compressed air energy storage power generation system according to claim 1, characterized in that: It also includes a heat exchanger, a water storage tank and a solar collector. The solar collector is connected to an external water source, the water inlet of the solar collector is connected to the first water outlet of the water storage tank, the water outlet of the solar collector is connected to the first water inlet of the water storage tank, the second water outlet of the water storage tank is connected to the water inlet of the heat exchanger, the second water inlet of the water storage tank is connected to the water outlet of the heat exchanger, and the second air outlet of the heat accumulator is connected to the air inlet of the expander through the heat exchanger.

3. A compressed air energy storage power generation system according to claim 1, characterized in that: The third air outlet of the heat storage device is connected to the heating unit of the external air-conditioning system to provide a heat source for the external air-conditioning system. The third air outlet of the cold storage device is connected to the refrigeration unit of the external air-conditioning system to provide a cold source for the external air-conditioning system.

4. A compressed air energy storage power generation system according to claim 2, characterized in that: The third water outlet and the third water inlet of the water storage tank are both connected to an external heat-using system to provide a heat source for the external heat-using system.

5. A compressed air energy storage power generation system according to any one of claims 1 to 4, characterized in that: The outer wall of the air storage chamber is provided with a heat-insulating layer.

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