Compressed air solidification energy storage device

Abstract

The compressed air solidification energy storage device comprises a water storage tank and an air storage tank, the outer side of the air storage tank is wrapped with a hollow heat exchanger, the heat exchanger and the water storage tank are connected through a liquid pipeline, an electric heating dehumidification pipe is installed in the middle of the interior of the air storage tank, and an opening is formed in the top end of the air storage tank; a gas pipeline and a power line connected with the electric heating dehumidification pipe are led out; the gas storage tank is filled with a solid gas storage material, the solid gas storage material comprises an upper-layer gas storage material and a lower-layer gas storage material, compared with the lower-layer gas storage material, the influence of moisture on the gas storage performance of the upper-layer gas storage material is small, and a separation net is arranged between the upper-layer gas storage material and the lower-layer gas storage material; the gas pipeline is connected with a pressure gauge and then is divided into two paths, one path is a gas outlet pipeline and comprises a valve II, a pressure reducing valve and a valve III which are connected in sequence, and the other path is a gas inlet pipeline and comprises a pressure release valve, a valve IV, a drying filter pipe and a valve V which are connected in sequence. The storage efficiency of the compressed air can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of renewable energy storage, and in particular relates to a compressed air solidification energy storage device. Background Art

[0002] Since power generation from renewable resources such as wind and light is highly uncontrollable, in order to maintain a balance between power suppliers and users in the power grid and ensure the safety of the grid, it is necessary to introduce energy storage as a flexible adjustment resource. Therefore, energy storage is an essential infrastructure for the development of new energy.

[0003] Compressed air energy storage can use electricity from new energy sources such as solar energy and wind energy to store compressed air, and release compressed air during peak load periods of the power grid to drive steam turbines to generate electricity. It has the advantages of large energy storage capacity, long energy storage cycle, and small specific investment, and is considered to be one of the large-scale energy storage technologies with the broadest development prospects. However, since compressed air storage requires a large space, most of the current compressed air energy storage projects are MW-level energy storage power stations, which require a large-scale site for gas tank placement. Therefore, compressed air energy storage systems are more suitable for large systems. Small compressed air energy storage systems are generally used in some special fields with low efficiency, and large systems require specific geographical conditions to build large gas storage chambers, such as rock caves, salt caves, abandoned mines, etc., which greatly limits the scope of application of compressed air energy storage systems. Summary of the invention

[0004] The object of the present invention is to provide a compressed air solidification energy storage device, which can effectively improve the storage efficiency of compressed air.

[0005] To achieve the above-mentioned purpose, the present invention provides a compressed air solidification energy storage device, comprising a water storage tank and a gas storage tank, a hollow heat exchanger is wrapped around the outside of the gas storage tank, the heat exchanger and the water storage tank are connected through two groups of liquid pipelines, a water pump and a valve are installed on the two groups of liquid pipelines respectively, an electric heating dehumidification pipe is installed in the center of the gas storage tank, an opening is provided at the top of the gas storage tank, and a gas pipeline and a power line connected to the electric heating dehumidification pipe are led outward;

[0006] The gas storage tank is filled with solid gas storage materials, which include upper gas storage materials and lower gas storage materials. Compared with the lower gas storage materials, the upper gas storage materials have less influence on gas storage performance due to moisture, and an isolation net is arranged between the upper gas storage materials and the lower gas storage materials.

[0007] A gas pressure gauge is connected to the gas pipeline, which is then divided into two routes. One route is the gas outlet pipeline, including valve two, a pressure reducing valve, and valve three connected in sequence; the other route is the gas inlet pipeline, including a pressure relief valve, valve four, a drying filter tube, and valve five connected in sequence.

[0008] As a further solution 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 six is ​​connected to the branch pipe.

[0009] As a further solution of the present invention: the upper gas storage material and the lower gas storage material are made of two gas storage materials in a ratio of 78:21 according to the solidification effects on nitrogen and oxygen respectively.

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

[0011] As a further solution of the present invention: the outside of the water storage tank and the heat exchanger are both wrapped with a heat insulation layer.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention can significantly increase the gas storage ratio and reduce the space required for gas storage by filling the solidified gas storage material in the gas storage tank; adopt two types of gas storage materials to reduce the influence of air humidity on the gas storage capacity; according to the difference in gas storage performance of the solidified gas storage material for different gases, the gas storage materials corresponding to nitrogen and oxygen are respectively arranged and proportioned according to the optimal ratio; it can realize compressed air energy storage of smaller size, greatly improve the energy storage density, improve the storage efficiency of compressed air, and have a wider range of applications.

[0014] 2. The present invention arranges an electric heating dehumidification tube inside the gas storage tank and a heat exchanger outside the gas storage tank, so as to reduce compression energy consumption and heat dissipation in the gas compression stage and increase the gas temperature in the compressed gas release stage to increase power generation, thereby improving storage efficiency and compressed air power generation and improving energy utilization efficiency.

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

[0016] 4. The present invention has a simple structure, low production and maintenance costs, a wider range of applications, can solve the technical bottleneck of the renewable energy storage industry, and is conducive to the large-scale development of clean energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0019] In the figure: 1. liquid pipeline, 2. water pump, 3. heat exchanger, 4. water storage tank, 5. valve one, 6. gas pipeline, 7. valve five, 8. drying filter tube, 9. valve four, 10. pressure relief valve, 11. valve three, 12. pressure reducing valve, 13. valve two, 14. gas pressure gauge, 15. valve six, 16. power cord, 17. clamping device, 18. gas storage tank, 19. electric heating dehumidification tube, 20. upper gas storage material, 21. lower gas storage material. DETAILED DESCRIPTION

[0020] The present invention will be further described below by way of examples.

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

[0022] The gas storage tank 18 is filled with solid gas storage materials, which include an upper gas storage material 20 and a lower gas storage material 21. The upper gas storage material 20 has less influence on gas storage performance than the lower gas storage material 21 due to moisture. 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 in the upper and lower layers according to the influence of moisture on gas storage performance, so as to reduce the influence of air humidity on gas storage capacity. The isolation net can prevent the upper gas storage material 20 and the lower gas storage material 21 from mixing.

[0023] The gas pipeline 6 is connected to a gas pressure gauge 14, and then is divided into two routes, one is a gas outlet pipeline, including valve 2 13, pressure reducing valve 12, valve 3 11 connected in sequence, and finally connected to an external turbine expander, and the other is a gas inlet pipeline, including pressure relief valve 10, valve 4 9, drying filter tube 8, valve 5 7 connected in sequence, and finally connected to an external high-pressure gas compressor. The valves on the outlet pipeline and the inlet pipeline are opened and closed according to the operation requirements, so as to realize the storage or release of compressed air.

[0024] The pressure relief valve 10 is a high-pressure gas pressure relief valve 10. When the gas pressure in the gas pipeline 6 reaches a preset threshold, the excess gas is released into the atmosphere to maintain system stability; the drying filter tube 8 is filled with desiccant and filter mesh, which can absorb 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 12, which controls the opening and closing parts in the valve body of the pressure reducing valve 12 to adjust the flow rate of the gas outlet, ensuring that the gas outlet outputs a constant airflow into the turbine expander.

[0025] In order to facilitate the electric heating dehumidification tube 19 to dry the solid gas storage material, further, 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 6 15 is connected to the branch pipe.

[0026] In order to improve the gas storage performance of the solid gas storage material, further, the upper gas storage material 20 and the lower gas storage material 21 respectively use two gas storage materials in a ratio of 78:21 according to the solidification effect of nitrogen and oxygen to achieve the highest air solidification efficiency.

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

[0028] Furthermore, the outside of the water storage tank 4 and the heat exchanger 3 are wrapped with a heat insulation layer, which can prevent heat loss and reduce energy waste.

[0029] When the present invention is used specifically: during the compressed air storage process, valve five 7 and valve four 9 are opened, valve three 11, valve two 13 and valve six 15 are closed, and the compressed gas enters the gas storage bottle through the gas pipeline 6; at the same time, valve one 5 and water pump 2 are opened to pump the water in the water storage tank 4 to the heat exchanger 3, and the heat of the gas storage tank 18 is transferred to the water storage tank 4, thereby reducing the temperature of the gas storage tank 18 and increasing the gas storage capacity;

[0030] During the compressed air storage process, valve 2 13, valve 3 11, pressure reducing valve 12, and electric heating dehumidification pipe 19 are opened, valve 4 9 and valve 6 15 are closed, and the solidified gas stored in the gas storage tank 18 is heated and output to the turbine expander through the gas pipeline 6; valve 1 5 and water pump 2 are opened at the same time, and the low-temperature water in the heat exchanger 3 is pumped to the water storage tank 4, and the heat of the water storage tank 4 is transferred to the gas storage tank 18, so as to increase the gas temperature and increase the output of the stored gas;

[0031] When the compressed air solidification energy storage device runs for a certain period of time and the performance of the gas storage material in the gas storage tank 18 decreases, the electric heating dehumidification pipe 19 and valve six 15 are opened, and valve two 13 and valve four 9 are closed to discharge the water molecules in the cavity through high temperature to improve the performance of the gas storage material.

Claims

1. A compressed air solidification energy storage device, comprising a water storage tank (4) and an air storage tank (18), wherein the air storage tank (18) is wrapped around a hollow heat exchanger (3), the heat exchanger (3) and the water storage tank (4) are connected via two sets of liquid pipelines (1), and a water pump (2) and a valve (5) are respectively installed on the two sets of liquid pipelines (1), wherein: An electric heating dehumidification tube (19) is centrally installed in the gas storage tank (18), and an opening is provided at the top of the gas storage tank (18), and a gas pipeline (6) and a power line (16) connected to the electric heating dehumidification tube (19) are led outward; The gas storage tank (18) is filled with solid gas storage material, the solid gas storage material comprises an upper gas storage material (20) and a lower gas storage material (21), the upper gas storage material (20) has less moisture than the lower gas storage material (21) in terms of gas storage performance, and an isolation net is arranged between the upper gas storage material (20) and the lower gas storage material (21); The gas pipeline (6) is connected to a gas pressure gauge (14) and then divided into two paths. One path is a gas outlet pipeline, which includes a valve 2 (13), a pressure reducing valve (12), and a valve 3 (11) connected in sequence, and the other path is a gas inlet pipeline, which includes a pressure relief valve (10), a valve 4 (9), a drying filter tube (8), and a valve 5 (7) connected in sequence.

2. A 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) and the lower gas storage material (21) are made of two gas storage materials in a ratio of 78:21 according to the solidification effects on nitrogen and oxygen respectively.

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 is provided with a pressing device (17).

5. A compressed air solidification energy storage device according to claim 1 or 2, characterized in that: The outsides of the water storage tank (4) and the heat exchanger (3) are both wrapped with a heat insulation layer.

Images