A compressed air solidification energy storage device

Abstract

This invention discloses a compressed air solidification energy storage device, comprising a water tank and a gas tank. A hollow heat exchanger is wrapped around the outside of the gas tank, and the heat exchanger is connected to the water tank via a liquid pipeline. An electrically heated dehumidifying pipe is centrally installed inside the gas tank. An opening is provided at the top of the gas tank, leading outwards to a gas pipeline and a power cord connected to the electrically heated dehumidifying pipe. The gas tank is filled with a solid gas storage material, comprising an upper layer and a lower layer. The moisture content of the upper layer has less impact on the gas storage performance compared to the lower layer. An isolation mesh is arranged between the upper and lower layers. A pressure gauge is connected to the gas pipeline, which then splits into two lines: a gas outlet pipeline, including valves two, three pressure reducing valves, and three valves connected in sequence; and a gas inlet pipeline, including a pressure relief valve, four valves, a drying filter pipe, and five valves connected in sequence. This invention can effectively improve the storage efficiency of compressed air.

Description

Technical Field

[0001] This invention belongs to the field of renewable energy storage technology, specifically relating to a compressed air solidification energy storage device. Background Technology

[0002] Because renewable energy sources such as wind and solar power are highly uncontrollable, it is necessary to introduce energy storage as a flexible adjustment resource in order to maintain the balance between power supply and consumption and ensure grid security. Therefore, energy storage is an essential infrastructure for the development of new energy.

[0003] Compressed air energy storage (CASS) utilizes electricity from renewable energy sources such as solar and wind power to store compressed air, which is then released to drive turbines for power generation during peak grid load periods. It boasts advantages such as large storage capacity, long storage life, and low initial investment, making it considered one of the most promising large-scale energy storage technologies. However, due to the significant space required for CASS storage, most current CASS projects are MW-level power plants, necessitating substantial land use for gas tank installation. Therefore, CASS systems are best suited for large-scale systems. Small-scale CASS systems are generally inefficient in specialized applications, while large-scale systems require specific geographical conditions for constructing large storage chambers, such as in rock caves, salt caverns, and abandoned mines, significantly limiting their application scope. Summary of the Invention

[0004] The purpose of this invention is to provide a compressed air solidification energy storage device that can effectively improve the storage efficiency of compressed air.

[0005] To achieve the above objectives, the present invention provides a compressed air solidification energy storage device, comprising a water tank and a gas tank. The gas tank is surrounded by a hollow heat exchanger. The heat exchanger is connected to the water tank via two liquid pipelines. A water pump is installed on one liquid pipeline, and a valve is installed on the other liquid pipeline. An electric heating dehumidification pipe is installed in the center of the gas tank. The top of the gas tank has an opening, and a gas pipeline and a power cord connected to the electric heating dehumidification pipe are led outwards.

[0006] The gas storage tank is filled with solid gas storage material, which includes an upper gas storage material and a lower gas storage material. The moisture content of the upper gas storage material has less impact on the gas storage performance than that of the lower gas storage material. An isolation net is arranged between the upper and lower gas storage materials.

[0007] A gas pressure gauge is connected to the gas pipeline, which then splits into two lines. One line is the gas outlet pipeline, which includes valve 2, pressure reducing valve, and valve 3 connected in sequence. The other line is the gas inlet pipeline, which includes pressure relief valve, valve 4, drying filter tube, and valve 5 connected in sequence.

[0008] As a further aspect of the present invention: a branch pipe is provided on the gas pipeline between the gas pressure gauge and the gas storage tank, and a valve is connected to the branch pipe.

[0009] As a further aspect of the present invention: the upper gas storage material is made up of two gas storage materials in a ratio of 78:21 based on the curing effect on nitrogen and oxygen, and the lower gas storage material is made up of two gas storage materials in a ratio of 78:21 based on the curing effect on nitrogen and oxygen.

[0010] As a further aspect of the present invention: the top opening of the gas storage tank is sealed and a clamping device is installed.

[0011] As a further aspect of the present invention, both the water storage tank and the heat exchanger are covered with a heat insulation layer.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. This invention significantly improves the gas storage ratio and reduces the space required for gas storage by filling the gas storage tank with solidified gas storage material; it uses two types of gas storage materials to reduce the impact of air humidity on the gas storage volume; based on the different gas storage performance of solidified gas storage materials for different gases, gas storage materials corresponding to nitrogen and oxygen are set separately and mixed in the optimal ratio; it can achieve compressed air energy storage in smaller size, greatly improve the energy storage density, improve the storage efficiency of compressed air, and has a wider range of applications.

[0014] 2. The present invention sets up an electric heating dehumidification tube inside the gas storage tank and a heat exchanger outside it. During the gas compression stage, it reduces compression energy consumption and heat dissipation, and during the compressed gas release stage, it increases the gas temperature to increase power generation. This can improve storage efficiency and compressed air power generation, and improve energy utilization efficiency.

[0015] 3. The present invention installs a drying filter tube in the compressed air inlet pipeline to reduce the impact of moisture and impurities in the air on the gas solidification efficiency.

[0016] 4. This invention has a simple structure, low production and maintenance costs, and a wider range of applications. It can solve the technical bottlenecks in the renewable energy storage industry and is conducive to the large-scale development of clean energy utilization. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the compressed air solidification energy storage device of the present invention;

[0018] Figure 2 This is a schematic diagram comparing the present invention with conventional compressed air technology.

[0019] In the diagram: 1. Liquid pipeline, 2. Water pump, 3. Heat exchanger, 4. Water storage tank, 5. Valve 1, 6. Gas pipeline, 7. Valve 5, 8. Drying filter tube, 9. Valve 4, 10. Pressure relief valve, 11. Valve 3, 12. Pressure reducing valve, 13. Valve 2, 14. Gas pressure gauge, 15. Valve 6, 16. Power cord, 17. Compacting device, 18. Gas storage tank, 19. Electric heating dehumidification tube, 20. Upper gas storage material, 21. Lower gas storage material. Detailed Implementation

[0020] The present invention will be further illustrated by the following examples.

[0021] like Figure 1 As shown, a compressed air solidification energy storage device includes a water tank 4 and an air tank 18. The air tank 18 is surrounded by a hollow heat exchanger 3. The heat exchanger 3 is connected to the water tank 4 via two liquid pipelines 1. A water pump 2 is installed on one liquid pipeline 1, and a valve 5 is installed on the other liquid pipeline 1. An electric heating dehumidification pipe 19 is installed in the center of the air tank 18. The top of the air tank 18 has an opening, and a gas pipeline 6 and a power cord 16 connected to the electric heating dehumidification pipe 19 are led outward. The electric heating dehumidification pipe 19 can increase the air storage output during the compressed air release process, and can also dry the solid air storage material, thereby improving the air storage performance of the solid air storage material.

[0022] The gas storage tank 18 is filled with solid gas storage material, which includes an upper gas storage material 20 and a lower gas storage material 21. The upper gas storage material 20 has less impact on gas storage performance than the lower gas storage material 21. An isolation net is arranged between the upper gas storage material 20 and the lower gas storage material 21. Two types of gas storage materials are selected and distributed as upper and lower layers according to the impact of moisture on gas storage performance, so as to reduce the impact of air humidity on the gas storage volume. The isolation net can prevent the upper gas storage material 20 and the lower gas storage material 21 from mixing.

[0023] Gas pressure gauge 14 is connected to gas pipeline 6, which then splits into two lines. One line is the gas outlet pipeline, which includes valve 13, pressure reducing valve 12, and valve 11 connected in sequence, finally connecting to an external turbine expander. The other line is the gas inlet pipeline, which includes pressure relief valve 10, valve 9, drying filter tube 8, and valve 7 connected in sequence, finally connecting to an external high-pressure gas compressor. The valves on the outlet and inlet pipelines are opened and closed according to operational needs to achieve compressed air storage or release.

[0024] The pressure relief valve 10 is a high-pressure gas pressure relief valve. When the gas pressure in the gas pipeline 6 reaches a preset threshold, it releases excess gas to the atmosphere to maintain system stability. The drying filter tube 8 is filled with desiccant and filter screen, which can adsorb moisture and filter dust in the air passing through the gas pipeline to ensure that pure gas enters the gas storage tank 18. The drying filter tube 8 needs to be replaced after its performance deteriorates after a certain period of operation. The pressure reducing valve 12 is a gas pressure reducing valve. The opening and closing parts in the valve body of the pressure reducing valve 12 are controlled to adjust the flow rate of the gas outlet to ensure that a constant airflow is output from the gas outlet into the turbine expander.

[0025] To facilitate the drying of solid gas storage material by the electric heating dehumidification tube 19, a branch pipe is further provided on the gas pipeline 6 between the gas pressure gauge 14 and the gas storage tank 18, and a valve 15 is connected to the branch pipe.

[0026] To further improve the gas storage performance of solid gas storage materials, the upper gas storage material 20 is made up of two gas storage materials in a 78:21 ratio based on the curing effect on nitrogen and oxygen, and the lower gas storage material 21 is made up of two gas storage materials in a 78:21 ratio based on the curing effect on nitrogen and oxygen, so as to achieve the highest air curing efficiency.

[0027] Furthermore, the top opening of the gas storage tank 18 is sealed and a clamping device 17 is installed.

[0028] Furthermore, both the water storage tank 4 and the heat exchanger 3 are wrapped with an insulation layer to prevent heat loss and reduce energy waste.

[0029] In specific use of this invention: during the compressed air storage process, valve 5 (7) and valve 4 (9) are opened, and valve 3 (11), valve 2 (13), and valve 6 (15) are closed. Compressed gas enters the storage cylinder through the gas pipeline 6. At the same time, valve 1 (5) and water pump 2 are opened to pump the water in the water tank 4 to the heat exchanger 3, which transfers the heat from the air tank 18 to the water tank 4, thereby reducing the temperature of the air tank 18 and increasing the storage capacity.

[0030] During the compressed air release process, valves 13, 11, 12, and 19 are opened, while valves 9 and 15 are closed. The gas stored in the gas tank 18 is heated and then output to the turbine expander through the gas pipeline 6. At the same time, valve 5 and water pump 2 are opened to pump the low-temperature water in the heat exchanger 3 to the water tank 4, transferring the heat from the water tank 4 to the gas tank 18, increasing the gas temperature and increasing the output of the stored gas.

[0031] When the performance of the gas storage material in the gas storage tank 18 decreases after the compressed air solidification energy storage device has been running for a certain period of time, the electric heating dehumidification pipe 19 and valve six 15 are opened, and valve two 13 and valve four 9 are closed. Water molecules in the cavity are discharged through high temperature, thereby improving the performance of the gas storage material.

Claims

1. A compressed air solidification energy storage device, comprising a water tank (4) and an air tank (18), wherein a hollow heat exchanger (3) is wrapped around the outside of the air tank (18), and the heat exchanger (3) is connected to the water tank (4) via two liquid pipelines (1), one of which is equipped with a water pump (2), and the other of which is equipped with a valve (5), characterized in that, An electric heating dehumidification tube (19) is installed in the center of the gas storage tank (18). The top of the gas storage tank (18) has an opening, and a gas pipeline (6) and a power cord (16) connected to the electric heating dehumidification tube (19) are led outward. The gas storage tank (18) is filled with solid gas storage material, which includes upper gas storage material (20) and lower gas storage material (21). The upper gas storage material (20) has less impact on gas storage performance than the lower gas storage material (21). An isolation net is arranged between the upper gas storage material (20) and the lower gas storage material (21). A gas pressure gauge (14) is connected to the gas pipeline (6), which then splits into two lines. One line is the gas outlet pipeline, which includes valve two (13), pressure reducing valve (12), and valve three (11) connected in sequence. The other line is the gas inlet pipeline, which includes pressure relief valve (10), valve four (9), drying filter tube (8), and valve five (7) connected in sequence.

2. The compressed air solidification energy storage device according to claim 1, characterized in that, A branch pipe is provided on the gas pipeline (6) between the gas pressure gauge (14) and the gas storage tank (18), and a valve six (15) is connected to the branch pipe.

3. A compressed air solidification energy storage device according to claim 1 or 2, characterized in that, The upper gas storage material (20) is made of two gas storage materials in a ratio of 78:21 according to the curing effect on nitrogen and oxygen. The lower gas storage material (21) is made of two gas storage materials in a ratio of 78:21 according to the curing effect on nitrogen and oxygen.

4. A compressed air solidification energy storage device according to claim 1 or 2, characterized in that, The top opening of the gas storage tank (18) is sealed and a clamping device (17) is installed.

5. A compressed air solidification energy storage device according to claim 1 or 2, characterized in that, Both the water storage tank (4) and the heat exchanger (3) are covered with an insulation layer.

Images