Salt cavern gravity compressed air energy storage system

Abstract

The utility model discloses a salt cavern gravity compressed air energy storage system which comprises a salt cavern, a vertical shaft is vertically arranged at the top of the salt cavern and communicated with the ground surface, a sealing film is arranged on the side wall of an inner cavity of the salt cavern and divides the salt cavern into a water storage cavity and an air storage cavity, and the bottom of the air storage cavity is connected with one end of an air pipe. A piston is arranged in the vertical shaft, a gravity block is arranged at the top of the piston, a water pipe communicated with the water storage cavity is arranged at the bottom of the water storage pool, and a water conservancy generator set is arranged on the water pipe. Liquid gravity is matched with salt cavern gas storage, liquid can be matched with the irregular shape of a salt cavern, construction is reduced, energy density is increased, meanwhile, sealing film damage caused by contact friction between a sealing film and the surface of the gravity block is avoided, and the service life of the sealing film is prolonged; and the hydraulic generator set can synchronously generate power, so that the energy storage efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of salt cavern gravity compressed air energy storage systems, belong to gravity compressed air energy storage technical field. BACKGROUND

[0002] Compressed air energy storage uses air as the carrier of energy, large-scale compressed air energy storage uses excess power to compress and store air in storage structure, when needed, compressed air is mixed with natural gas, burned and expanded to drive gas turbine to generate electricity. Its advantages are peak shaving function, suitable for large-scale wind farms, because the mechanical work generated by wind energy can directly drive the compressor to rotate, reducing the intermediate conversion into electricity, thereby improving efficiency. In prior art, traditional compressed air energy storage system construction, investment cost is high, according to salt cavern construction compressed air energy storage system can use waste resources, however, salt cavern irregular shape construction difficulty is great. Therefore, we propose a kind of salt cavern gravity compressed air energy storage system to solve the above problems. SUMMARY

[0003] The utility model aims at providing a kind of salt cavern gravity compressed air energy storage system, using liquid gravity cooperates salt cavern storage gas, liquid can adapt the irregular shape of salt cavern, reduce construction, increase energy density, solve the problem of large investment cost of traditional compressed air energy storage system, while solving the problem of reusing salt cavern resources.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: a kind of salt cavern gravity compressed air energy storage system, comprising:

[0005] Salt cavern, the inner cavity side wall of the salt cavern is provided with a sealing film, the sealing film divides the salt cavern into upper and lower two parts of water storage cavity and gas storage cavity, one end of the gas pipe connected to the bottom of the gas storage cavity, the other end of the gas pipe is connected in parallel with air compressor unit and expansion generator set, air compressor unit compressed air enters the storage cavity and is stored, expansion generator set can generate electricity by the high-pressure air released in the storage cavity;

[0006] Shaft, the shaft is vertically erected and communicates the water storage cavity of salt cavern with ground surface, and piston is arranged in the shaft, the top of the piston is provided with a gravity block, and the inner wall of the shaft is sealed;

[0007] Water reservoir, the water reservoir is placed above the salt cavern, so that the water reservoir and the water storage cavity of the salt cavern form a height difference, the water pipe connected with the water storage cavity is arranged on the bottom of the water reservoir, and the water pipe is provided with a water power generator set, and the water power generator set can generate electricity using the potential energy of water flow in the pipe.

[0008] The foregoing salt cavern gravity compressed air energy storage system, the connection end of the air compressor unit and the expansion generator set and the gas pipe is provided with a valve.

[0009] The salt cavern gravity compressed air energy storage system of the preceding, wherein a valve is arranged on the water pipe.

[0010] The salt cavern gravity compressed air energy storage system of the preceding, wherein a mounting groove is arranged on the side wall of the salt cavern, an upper sealing piece and a lower sealing piece are inserted into the mounting groove, the end of the sealing membrane is clamped between the upper sealing piece and the lower sealing piece, and the mounting groove is filled with a filling part, and the filling part fixes the sealing piece and the lower sealing piece in the mounting groove.

[0011] The salt cavern gravity compressed air energy storage system of the preceding, wherein a circular groove is arranged on the contact surface between the upper sealing piece and the lower sealing piece, a membrane skeleton is arranged in the circular groove, and the end of the sealing membrane is folded and wound on the surface of the membrane skeleton.

[0012] The salt cavern gravity compressed air energy storage system of the preceding, wherein the filling part comprises a foamed expansion layer and a sealing casting layer, and the foamed expansion layer is arranged inside the sealing casting layer.

[0013] The salt cavern gravity compressed air energy storage system of the preceding, wherein a guide structure is arranged on the side wall of the gravity block.

[0014] Compared with the prior art, the utility model discloses liquid gravity cooperates with salt cavern storage gas, liquid can adapt to the irregular shape of salt cavern, reduces construction, increases energy density, and simultaneously, liquid can be used as an intermediate layer, can avoid that the contact and friction of the sealing membrane and the surface of the gravity block cause the sealing membrane to be damaged, prolongs the service life of the sealing membrane, and in the energy releasing and power generating process, the water conservancy generating set can synchronously generate power, improves the energy storage efficiency, and the utility model discloses not only solve the problem of large investment cost of the traditional compressed air energy storage system, but also solve the problem of reusing salt cavern resources, has good economic benefit and environmental protection benefit. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the system structure schematic diagram of the utility model discloses;

[0016] Figure 2 It is the sealing membrane mounting structure schematic diagram of the utility model discloses.

[0017] Fig. 1 is a salt cavern, 2 is a sealing membrane, 3 is a water storage cavity, 4 is a gas storage cavity, 5 is a vertical shaft, 6 is a piston, 7 is a gravity block, 8 is a water reservoir, 9 is a water pipe, 10 is a water conservancy generating set, 11 is a gas pipe, 12 is an air compressor unit, 13 is an expansion generator unit, 14 is a mounting groove, 15 is an upper sealing piece, 16 is a lower sealing piece, 17 is a filling part, 18 is a circular groove, 19 is a membrane skeleton, 20 is a foamed expansion layer, and 21 is a sealing casting layer.

[0018] The utility model discloses will be further explained in combination with the drawings and specific embodiment. DETAILED DESCRIPTION

[0019] The utility model discloses an embodiment 1: a salt cavern gravity compressed air energy storage system, include: salt cavern 1, adopt the abandoned, good sealing salt cavern 1 as energy storage structure, set up shaft 5 vertically in its top, also can utilize existing tunnel reformation, shaft 5 is connected to the ground, the inner chamber lateral wall of salt cavern 1 is provided with sealing membrane 2, and sealing membrane 2 divides salt cavern 1 into the upper and lower two parts of water storage cavity 3 and gas storage cavity 4, and one end of gas pipe 11 is connected to the bottom of gas storage cavity 4, and the other end of gas pipe 11 is connected with air compressor unit 12 and expansion generator set 13 in parallel, and shaft 5 is vertically set up and is connected water storage cavity 3 of salt cavern 1 with the ground, and is provided with piston 6 in shaft 5, and the top of piston 6 is provided with gravity block 7, and water storage pool 8 is excavated on the ground and lays waterproof structure, and water storage pool 8 is placed above salt cavern 1, so that water storage pool 8 and the water storage cavity 3 of salt cavern 1 form height difference, and the bottom of water storage pool 8 is provided with water pipe 9 that is connected with water storage cavity 3, and water pipe 9 is provided with water power generator set 10.

[0020] Air compressor unit 12 can pressurize air into the gas storage cavity 4 below sealing membrane 2, carry out compressed air energy storage, and the water in water storage cavity 3 and gravity block 7 can provide pressure for it, ensure that a certain water is retained in water storage cavity 3, water is more close to the surface of sealing membrane 2, at the same time, avoid the contact and friction between sealing membrane 2 and the surface of gravity block 7, cause sealing membrane 2 damage, prolong the service life of sealing membrane 2, release compressed air into expansion generator set 13 to generate electricity, open the water valve at the same time, and gravity block 7 is pressed down piston 6 through its gravity, and the water pressure in water storage pool 8 continuously exerts pressure on the air in gas storage cavity 4, generate electricity, when the water in water storage pool 8 flows into water storage cavity 3 through its gravity, water power generator set 10 can generate electricity simultaneously, improve energy storage efficiency.

[0021] The utility model discloses an embodiment 2: a kind of salt cavern gravity compressed air energy storage system, comprising: salt cavern 1, using abandoned, good salt cavern 1 of sealing as energy storage structure, vertical well 5 is vertically set in its top, also can utilize existing tunnel reconstruction, vertical well 5 is connected to ground, and the inner cavity lateral wall of salt cavern 1 is provided with sealing membrane 2, sealing membrane 2 divides salt cavern 1 into upper and lower two parts of water storage cavity 3 and gas storage cavity 4, and one end of gas pipe 11 is connected to the bottom of gas storage cavity 4, and the other end of gas pipe 11 is connected with air compressor set 12 and expansion generator set 13 in parallel, vertical well 5 vertically sets up and is connected water storage cavity 3 of salt cavern 1 with ground, and vertical well 5 is provided with piston 6, and the top of piston 6 is provided with gravity block 7, and water reservoir 8 is excavated on ground, and waterproof structure is laid, and water reservoir 8 is placed above salt cavern 1, so that water reservoir 8 and the water storage cavity 3 of salt cavern 1 form height difference, and water pipe 9, which is connected with water storage cavity 3, is arranged at the bottom of water reservoir 8, and water conservancy generator set 10 is arranged on water pipe 9, wherein, valve is arranged on the connecting end of air compressor set 12 and expansion generator set 13 and gas pipe 11, and valve is also arranged on water pipe 9, and valve is all used electric control valve and is connected with external control system.

[0022] Air compressor set 12 can pressurize air into gas storage cavity 4 below sealing membrane 2, and compressed air energy storage is carried out, and the water of water storage cavity 3 and gravity block 7 can provide pressure for it, ensure that a certain water is retained in water storage cavity 3, water is more close to the surface of sealing membrane 2, while avoiding that sealing membrane 2 and gravity block 7 surface contact friction cause sealing membrane 2 damage, prolong the service life of sealing membrane 2;Through releasing compressed air into expansion generator set 13 to generate electricity, while opening water valve, gravity block 7 is pressed down piston 6 by its gravity, and water pressure in water reservoir 8 continuously pressurizes air in gas storage cavity 4, to generate electricity, when the water in water reservoir 8 flows into water storage cavity 3 by its gravity, water conservancy generator set 10 can generate electricity simultaneously, improve energy storage efficiency.

[0023] Specifically, the salt cave 1 side wall is provided with a mounting groove 14, the mounting groove 14 is inserted with an upper sealing piece 15 and a lower sealing piece 16, the end of the sealing film 2 is clamped between the upper sealing piece 15 and the lower sealing piece 16, the mounting groove 14 is filled with a filling part 17, and the filling part 17 fixes the sealing piece 15 and the lower sealing piece 16 in the mounting groove 14, the contact surface between the upper sealing piece 15 and the lower sealing piece 16 is provided with a circular groove 18, the circular groove 18 is provided with a film skeleton 19, the end of the sealing film 2 is folded and wound on the surface of the film skeleton 19, the filling part 17 comprises a foaming expansion layer 20 and a sealing casting layer 21, the foaming expansion layer 20 is arranged inside the sealing casting layer 21, in construction, the mounting groove 14 is designed to surround the side wall of the salt cave 1 and is approximately regular in shape according to the shape of the salt cave 1, the upper sealing piece 15 and the lower sealing piece 16 are manufactured according to the shape surrounded by the mounting groove 14, and a spliced structure can be adopted when necessary to facilitate installation, the film skeleton 19 is made of flexible metal and has a smooth surface, the upper sealing piece 15 and the lower sealing piece 16 are first placed in the mounting groove 14, the end of the sealing film 2 is folded and wound on the surface of the film skeleton 19, the film skeleton 19 is placed in the circular groove 18, the upper sealing piece 15 and the lower sealing piece 16 are pressed, the expansion agent such as foaming glue is filled into the upper and lower gaps of the upper sealing piece 15 and the lower sealing piece 16 in the mounting groove 14, the expansion agent is expanded to press the upper sealing piece 15 and the lower sealing piece 16 and solidified, and then the sealing material such as modified concrete is cast in the remaining space of the mounting groove 14, and waterproof sealing paint is brushed, etc.; the mounting groove 14 is opened, and the sealing film 2 is sealed and fixed through the upper sealing piece 15, the lower sealing piece 16 and the film skeleton 19, the sealing structure is convenient to install, has high structural strength and good sealing performance.

[0024] The utility model discloses an embodiment 3: a kind of salt cave gravity compressed air energy storage system, comprising: salt cave 1, using abandoned, good sealing salt cave 1 as energy storage structure, vertical shaft 5 is vertically opened in its top, also can utilize existing tunnel reformation, vertical shaft 5 is connected to ground, and the side wall of salt cave 1 inner chamber is provided with sealing film 2, sealing film 2 divides salt cave 1 into upper and lower two parts of water storage cavity 3 and gas storage cavity 4, and one end of gas pipe 11 is connected at the bottom of gas storage cavity 4, and the other end of gas pipe 11 is connected with air compressor set 12 and expansion generator set 13 in parallel, vertical shaft 5 is vertically set and is connected water storage cavity 3 of salt cave 1 with ground, and piston 6 is provided in vertical shaft 5, and the top of piston 6 is provided with gravity block 7, and water storage pool 8 is excavated on ground, and waterproof structure is laid, and water storage pool 8 is placed above salt cave 1, so that water storage pool 8 and the water storage cavity 3 of salt cave 1 form height difference, and water pipe 9 is provided on the bottom of water storage pool 8 and is connected with water storage cavity 3, and water conservancy generator set 10 is provided on water pipe 9, wherein, the connection end of air compressor set 12 and expansion generator set 13 with gas pipe 11 is provided with valve, and valve is also provided on water pipe 9, and valve all uses electric control valve and is connected with external control system.

[0025] Specifically, the side wall of the salt cave 1 is provided with a mounting groove 14, the upper sealing piece 15 and the lower sealing piece 16 are inserted in the mounting groove 14, the end of the sealing film 2 is clamped between the upper sealing piece 15 and the lower sealing piece 16, the mounting groove 14 is filled with a filling part 17, the filling part 17 fixes the sealing piece 15 and the lower sealing piece 16 in the mounting groove 14, the contact surface between the upper sealing piece 15 and the lower sealing piece 16 is provided with a circular groove 18, the film skeleton 19 is arranged in the circular groove 18, the end of the sealing film 2 is folded and wound on the surface of the film skeleton 19, the filling part 17 comprises a foaming expansion layer 20 and a sealing casting layer 21, the foaming expansion layer 20 is arranged on the inner side of the sealing casting layer 21, in construction, the mounting groove 14 is designed to surround the side wall of the salt cave 1 and is approximately regular in shape, the upper sealing piece 15 and the lower sealing piece 16 are manufactured according to the shape surrounded by the mounting groove 14, and a spliced structure can be adopted when necessary, so that the installation is facilitated, the film skeleton 19 is made of flexible metal and is smooth in surface, the upper sealing piece 15 and the lower sealing piece 16 are first arranged in the mounting groove 14, the end of the sealing film 2 is folded and wound on the surface of the film skeleton 19, the film skeleton 19 is arranged in the circular groove 18, the upper sealing piece 15 and the lower sealing piece 16 are compressed, the expansion agent such as foaming glue is filled in the upper and lower gaps of the upper sealing piece 15 and the lower sealing piece 16 in the mounting groove 14, the expansion agent is expanded to press and solidify the upper sealing piece 15 and the lower sealing piece 16, and then the sealing material such as modified concrete is cast in the remaining space of the mounting groove 14, and waterproof sealing paint is brushed, etc.; the mounting groove 14 is opened, and the sealing film 2 is sealed and fixed through the upper sealing piece 15, the lower sealing piece 16 and the film skeleton 19, the sealing structure is convenient to install, high in structural strength and good in sealing performance.

[0026] Specifically, the side wall of the gravity block 7 is provided with a guide structure, so that the ascending and descending stroke of the gravity block 7 is more stable.

[0027] The working principle of one embodiment of the utility model is as follows: the utility model has two working states of energy storage and energy release in the use process, wherein:

[0028] When the energy is stored, the air compressor set 12 pressurizes air into the air storage cavity 4 below the sealing film 2, the water in the water storage cavity 3 is gradually pushed back to the water storage pool 8 through the gas pressure, the piston 6 and the gravity block 7 are lifted up at the same time, the water valve is closed when the water storage pool 8 reaches a certain height, a certain amount of water is reserved in the water storage cavity 3, air is continuously pressurized into the air storage cavity 4, the gravity block 7 is lifted up until the maximum threshold value set in the energy storage is reached;

[0029] When the energy is released, the compressed air is released to generate electricity in the expansion generator set 13, and the water valve is opened at the same time, the gravity block 7 continuously presses the piston 6 and the water pressure in the water storage pool 8 to pressurize the air in the air storage cavity 4, so as to generate electricity, when the water in the water storage pool 8 flows into the water storage cavity 3 through the self-gravity, the water power generator set 10 synchronously generates electricity.

Claims

1. A salt cavern gravity compressed air energy storage system, characterized in that, include: A salt cavern (1) is provided with a sealing membrane (2) on the inner wall of the salt cavern (1). The sealing membrane (2) divides the salt cavern (1) into two parts: a water storage chamber (3) and an air storage chamber (4). The bottom of the air storage chamber (4) is connected to one end of an air pipe (11). The other end of the air pipe (11) is connected in parallel to an air compressor unit (12) and an expansion generator unit (13). A vertical shaft (5) is vertically erected and connects the water storage chamber (3) of the salt cave (1) to the ground surface. A piston (6) is installed inside the vertical shaft (5), and a gravity block (7) is installed on the top of the piston (6). A water storage tank (8) is placed above a salt cavern (1) to create a height difference between the water storage tank (8) and the water storage chamber (3) of the salt cavern (1). A water pipe (9) connected to the water storage chamber (3) is provided at the bottom of the water storage tank (8), and a water-powered generator set (10) is provided on the water pipe (9).

2. The salt cavern gravity compressed air energy storage system according to claim 1, characterized in that, Valves are provided at the connection ends of the air compressor unit (12) and the expander generator unit (13) with the air pipe (11).

3. The salt cavern gravity compressed air energy storage system according to claim 1, characterized in that, A valve is installed on the water pipe (9).

4. The salt cavern gravity compressed air energy storage system according to claim 1, characterized in that, The side wall of the salt cave (1) is provided with an installation groove (14), in which an upper sealing element (15) and a lower sealing element (16) are inserted. The end of the sealing membrane (2) is clamped between the upper sealing element (15) and the lower sealing element (16). The installation groove (14) is filled with a filling part (17), and the filling part (17) fixes the sealing element (15) and the lower sealing element (16) in the installation groove (14).

5. The salt cavern gravity compressed air energy storage system according to claim 4, characterized in that, A circular groove (18) is provided on the contact surface between the upper seal (15) and the lower seal (16), and a membrane skeleton (19) is provided in the circular groove (18). The end of the sealing membrane (2) is folded and wrapped around the surface of the membrane skeleton (19).

6. A salt cavern gravity compressed air energy storage system according to claim 4 or 5, characterized in that, The filling part (17) includes a foam expansion layer (20) and a sealing casting layer (21), wherein the foam expansion layer (20) is placed inside the sealing casting layer (21).

7. The salt cavern gravity compressed air energy storage system according to claim 1, characterized in that, The sidewall of the gravity block (7) is provided with a guide structure.

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