Compressed air energy storage power station capable of reducing heat energy loss

Abstract

The invention relates to a compressed air energy storage power station capable of reducing heat energy loss in the technical field of compressed air energy storage. The compressed air energy storage power station comprises a compressor unit, an expansion unit, an air storage tank, a heat storage tank, a first heat exchanger and a second heat exchanger. A piston plate for separating a cavity is arranged in the gas storage tank; an upper cavity of the air storage tank is connected with a heat exchange inlet pipe and a heat exchange outlet pipe, the heat exchange outlet pipe is provided with a first valve, the heat exchange outlet pipe is communicated with the top end of the heat storage tank through a shell pass of a first heat exchanger, the heat exchange inlet pipe is provided with a second valve and a circulating pump, and the heat exchange inlet pipe is communicated with the bottom end of the heat storage tank through a shell pass of a second heat exchanger; the lower cavity of the air storage tank is connected with an air inlet pipe and an air outlet pipe, the air inlet pipe is provided with a third valve and connected with the compressor unit through the tube pass of the first heat exchanger, the air outlet pipe is provided with a fourth valve, and the air outlet pipe is connected with the expansion unit through the tube pass of the second heat exchanger; the compressed air energy storage power station can reduce heat energy loss and improve the stability of air pressure release.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a compressed air energy storage power station capable of reducing heat energy loss. Background Art

[0002] Compressed air energy storage is a technology that converts electrical energy into compressed air and stores it. Its basic principle is to use electricity to drive an air compressor to compress the air and store it in a high-pressure container. When the energy needs to be released, the stored compressed air is converted into electrical energy through an expander or turbine. Traditional compressed air energy storage power stations will generate compression heat during the air compression process. This part of the heat is usually taken away by cooling water and eventually dissipated, which is very wasteful. When the compressed air is released and expanded to generate electricity, additional air heating is required to improve efficiency. This round trip increases the heat energy loss. Summary of the invention

[0003] In order to overcome the deficiencies in the background technology and solve the existing technical problems, the present invention discloses a compressed air energy storage power station that reduces heat energy loss. Through a simple and ingenious design, it can reduce heat energy loss and improve the stability of air release pressure.

[0004] To achieve the above object, the present invention adopts the following technical solution: A compressed air energy storage power station for reducing heat energy loss comprises a compressor unit, an expansion unit, a gas storage tank, a heat storage tank, a first heat exchanger and a second heat exchanger; the gas storage tank is provided with a piston plate for dividing the inner cavity of the gas storage tank into an upper cavity and a lower cavity, the edge of the piston plate is slidably sealed with the inner wall of the gas storage tank and can slide vertically; a heat exchange fluid is stored in the upper cavity of the gas storage tank, a heat exchange inlet pipe and a heat exchange outlet pipe are connected to the top of the upper cavity, the heat exchange outlet pipe is installed with a first valve, and the heat exchange outlet pipe passes through a first The shell side of the heat exchanger is correspondingly connected to the top of the heat storage tank, the heat exchange inlet pipe is equipped with a second valve and a circulating pump, and the heat exchange inlet pipe is correspondingly connected to the bottom end of the heat storage tank through the shell side of the second heat exchanger; the bottom end of the lower cavity of the air storage tank is connected to an air inlet pipe and an air outlet pipe, the air inlet pipe is equipped with a third valve, the air inlet pipe is correspondingly connected to the compressor unit through the pipe side of the first heat exchanger, the air outlet pipe is equipped with a fourth valve, and the air outlet pipe is correspondingly connected to the expansion unit through the pipe side of the second heat exchanger.

[0005] Furthermore, a breathing valve is installed at the center of the top of the gas storage tank.

[0006] Furthermore, the first valve is configured as a regulating valve.

[0007] Furthermore, a pressure reducing valve is installed on the pipeline between the expansion unit and the second heat exchanger.

[0008] Furthermore, a discharge pipe with a drain valve is provided at the center of the bottom of the gas storage tank.

[0009] Furthermore, the air inlet pipe is equipped with a one-way valve for conducting air intake to the air storage tank.

[0010] Furthermore, a fifth valve is installed on the pipeline between the heat storage tank and the second heat exchanger.

[0011] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The compressed air energy storage power station with reduced heat energy loss disclosed in the present invention is separated by a piston plate so that the upper cavity and the lower cavity of the gas storage tank can be used to store low-temperature heat exchange fluid and compressed air respectively, and then a heat storage tank is provided to store high-temperature heat exchange fluid, and in conjunction with the use of a heat exchanger, the heat generated by the compressed air can be used for heating the air when it is released, thereby greatly reducing heat energy loss; moreover, by designing the gas storage tank to be dual-purpose, when the gas storage tank is inhaled, the piston plate is pushed to move to press out the heat exchange fluid in the upper cavity, which can also reduce equipment costs; when the gas storage tank is discharged, the heat exchange fluid entering through the upper cavity pushes the piston plate downward, and when the pressure release is reduced, the volume of the lower cavity can be simultaneously adapted to be reduced, thereby stabilizing the deflation pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the implementation structure of the present invention.

[0013] In the figure: 1. compressor unit; 2. first heat exchanger; 3. heat storage tank; 4. expansion unit; 5. pressure reducing valve; 6. fifth valve; 7. second heat exchanger; 8. non-return valve; 9. fourth valve; 10. third valve; 11. steam trap; 12. circulating pump; 13. piston plate; 14. gas storage tank; 15. second valve; 16. first valve. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present invention and are for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0015] Combined with Figure 1The compressed air energy storage power station for reducing heat energy loss comprises a compressor unit 1, an expansion unit 4, a gas storage tank 14, a heat storage tank 3, a first heat exchanger 2 and a second heat exchanger 7; the gas storage tank 14 is provided with a piston plate 13 which divides the inner cavity of the gas storage tank 14 into an upper cavity and a lower cavity, the edge of the piston plate 13 is slidably sealed with the inner wall of the gas storage tank 14 and can slide vertically, and during the movement of the piston plate 12, although the upper cavity and the lower cavity will change in volume, they always remain isolated from each other; as needed, a breathing valve is installed at the center of the top of the gas storage tank 14, which can prevent negative pressure from occurring in the upper cavity while isolating the heat exchange liquid, causing difficulty in the flow of the heat exchange fluid; in addition, a discharge pipe with a drain valve 11 is provided at the center of the bottom of the gas storage tank 14, which is used to discharge water droplets formed on the wall of the gas storage tank 14 when the air is compressed; The upper cavity of the gas storage tank 14 stores a heat exchange fluid, and the top of the upper cavity is connected to a heat exchange inlet pipe and a heat exchange outlet pipe, and the heat exchange outlet pipe is installed with a first valve 16. Specifically, the first valve 16 is set as a regulating valve, which can be used to adjust the flow rate of the heat exchange fluid outflowing, and the heat exchange outlet pipe is correspondingly connected with the top of the heat storage tank 3 through the shell side of the first heat exchanger 2, so that the low-temperature heat exchange fluid can exchange heat with the compressed and heat-releasing air, and the heat exchange inlet pipe is installed with a second valve 15 and a circulating pump 12. The heat exchange inlet pipe is correspondingly connected with the bottom end of the heat storage tank 3 through the shell side of the second heat exchanger 7, so that the high-temperature heat exchange fluid can exchange heat with the released air; in addition, a fifth valve 6 is installed on the pipeline between the heat storage tank 3 and the second heat exchanger 7. Generally, the heat storage tank 3 is provided with a thermal insulation layer. By closing the fifth valve 6, the thermal insulation effect can be improved; An air inlet pipe and an air outlet pipe are connected to the bottom end of the lower cavity of the air storage tank 14. The air inlet pipe is installed with a third valve 10. The air inlet pipe is installed with a one-way valve 8 that conducts air to the air storage tank 14 to prevent the compressed air in the lower cavity of the air storage tank 14 from flowing back into the air inlet pipe. The air inlet pipe is connected to the compressor unit 1 through the pipe line of the first heat exchanger 2. The air outlet pipe is installed with a fourth valve 9. The air outlet pipe is connected to the expansion unit 4 through the pipe line of the second heat exchanger 7. The compressed air in the air storage tank 14 is released through the air outlet pipe for power generation. In addition, a pressure reducing valve 5 is installed on the pipeline between the expansion unit 4 and the second heat exchanger 7, which can further adjust the release pressure to ensure the stability of power generation.

[0016] In the implementation of the compressed air energy storage power station for reducing heat energy loss described in the present invention, when compressing air energy storage, the piston plate 13 is initially located at the bottom of the gas storage tank 14. At this time, the upper cavity has the largest volume and stores low-temperature hot water. The third valve 10 and the first valve 16 are opened, and the fourth valve 9 and the second valve 15 are kept in a closed state. Then the compressor unit 1 is started to compress the air. The compressed air that first enters the lower cavity of the gas storage tank 14 is cooled by the piston plate 13 and the low-temperature hot water in the upper cavity, while the piston plate 13 is pushed upward by the increasing pressure, thereby pressing out the low-temperature hot water. The compressed air that enters later is continuously cooled by the first heat exchanger 2, and the hot water that has been heated by heat exchange will enter the heat storage tank 3 for storage. After the volume of the lower cavity of the gas storage tank 14 is expanded and filled with compressed air, the third valve 10 is closed for storage. When the compressed air is released to generate electricity, the piston plate 13 is initially located at the top of the gas storage tank 14. At this time, the volume of the lower cavity is the largest and compressed air is stored. The fourth valve 9 and the second valve 15 are opened, and the third valve 10 and the first valve 16 are kept in a closed state. At the same time, the circulating pump 12 is started. When the compressed air is released and passes through the second heat exchanger 7, the high-temperature hot water stored in the heat storage tank 3 will also pass through the second heat exchanger 7 and heat the released air to improve its efficiency in generating electricity by the expansion unit 4. The hot water after heat exchange and cooling is returned to the upper cavity of the gas storage tank 14 for storage, and the piston plate 13 is pressed down by gravity, so that the volume of the lower cavity is reduced while the pressure is released, thereby achieving a certain pressure stabilization effect.

[0017] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A compressed air energy storage power station for reducing heat loss, characterized by: The invention comprises a compressor unit (1), an expansion unit (4), an air storage tank (14), a heat storage tank (3), a first heat exchanger (2) and a second heat exchanger (7); the air storage tank (14) is provided with a piston plate (13) for dividing the inner cavity of the air storage tank (14) into an upper cavity and a lower cavity; the edge of the piston plate (13) is slidably sealed with the inner wall of the air storage tank (14) and can slide vertically; the upper cavity of the air storage tank (14) stores heat exchange fluid; the top end of the upper cavity is connected to a heat exchange inlet pipe and a heat exchange outlet pipe; the heat exchange outlet pipe is installed with a first valve (16); the heat exchange outlet pipe passes through the first heat exchanger (2) The shell side is correspondingly connected to the top end of the heat storage tank (3); the heat exchange inlet pipe is installed with a second valve (15) and a circulation pump (12); the heat exchange inlet pipe is correspondingly connected to the bottom end of the heat storage tank (3) through the shell side of the second heat exchanger (7); the bottom end of the lower cavity of the air storage tank (14) is connected to an air inlet pipe and an air outlet pipe; the air inlet pipe is installed with a third valve (10); the air inlet pipe is correspondingly connected to the compressor unit (1) through the pipe side of the first heat exchanger (2); the air outlet pipe is installed with a fourth valve (9); the air outlet pipe is correspondingly connected to the expansion unit (4) through the pipe side of the second heat exchanger (7).

2. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: A breathing valve is installed at the center of the top end of the gas storage tank (14).

3. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: The first valve (16) is configured as a regulating valve.

4. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: A pressure reducing valve (5) is installed on the pipeline between the expansion unit (4) and the second heat exchanger (7).

5. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: A discharge pipe with a drain valve (11) is provided at the center of the bottom of the gas storage tank (14).

6. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: The air inlet pipe is provided with a one-way valve (8) for conducting air intake to the air storage tank (14).

7. The compressed air energy storage power station for reducing heat loss according to claim 1 is characterized in that: A fifth valve (6) is installed on the pipeline between the heat storage tank (3) and the second heat exchanger (7).

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