Energy storage system based on well and rock salt mining technology

Abstract

The utility model relates to the technical field of well and rock salt mining, in particular to an energy storage system based on a well and rock salt mining process, which comprises a clean water tank, a brine mining well, a brine tank, a brine pump and a salt factory, the clear water tank is connected with the brine mining well, the brine mining well is connected with the brine tank, the brine tank is connected with the brine pump, and the brine pump is connected with the salt factory; the brine tank, the brine pump, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the salt plant and the osmosis energy storage pipe form a reverse osmosis energy storage system; the clear water tank, the first control valve, the second control valve, the permeation energy storage pipe, the brine tank, the brine pump, the third control valve, the fourth control valve, the sixth control valve and the water turbine form a salinity difference power generation system, and well and rock salt mining is coupled with the salinity difference energy and reverse osmosis technology, so that salinity difference energy contained in concentrated brine generated in the well and rock salt mining process can be utilized to generate power; waste electricity of a power grid can be recycled, and the concentration of brine conveyed to a salt factory is improved.

Description

Technical Field

[0001] This utility model relates to the field of well and mineral salt mining technology, and in particular to an energy storage system based on well and mineral salt mining technology. Background Technology

[0002] Salinity gradient energy (SGR) is an emerging renewable energy source that generates electricity based on the energy conversion of the chemical potential difference between water bodies with different salinities. Currently, there are three common energy conversion methods for SGR power generation: osmotic pressure energy, vapor pressure energy, and dialysis cell method. Osmotic pressure energy utilizes the osmotic pressure difference across a semi-permeable membrane to drive a turbine to generate electricity. Reverse osmosis, as the reverse process of osmotic pressure energy, applies external pressure to drive water molecules from a concentrated solution to a dilute solution, while retaining salt. It is commonly used in water purifiers and seawater desalination.

[0003] The extraction of well salt has unique water cycle characteristics. During extraction, a large amount of fresh water needs to be injected into the underground salt layer to dissolve the salt rock and form brine, which is then discharged for salt production. This extraction process has the following problems: high energy consumption, as the extraction, pressurization, and transportation of fresh water require a large amount of electricity; low brine concentration, as different brine wells have different geological conditions, and the brine concentration extracted from some wells does not meet the standards of salt plants, requiring additional concentration treatment; and resource waste, as the continuously extracted high-concentration brine is not effectively utilized, and its salinity gradient potential remains untapped. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the problems of complex procedures and low utilization rate in the salt solution transportation and heating process in the existing technology of salinity gradient power generation, an energy storage system based on well salt mining technology is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an energy storage system based on well and mine salt mining technology, including a clean water tank, a brine well, a brine tank, a brine pump, and a salt plant;

[0006] The clean water tank is connected to the brine well and is used to inject clean water into the brine well. The brine well is connected to the brine tank and is used to store the brine output from the brine well. The brine tank is connected to the brine pump and the brine pump is connected to the salt plant.

[0007] The clear water tank is connected to a water turbine and a second control valve. The pipeline connecting the second control valve and the water turbine has a first control valve. The pipeline connecting the first control valve and the second control valve has a connection point a.

[0008] The brine tank is connected to a third control valve. The pipeline connecting the brine pump and the salt plant has connection points b and c. The third control valve is connected to connection point b through a sixth control valve. The pipeline connecting the third control valve and the sixth control valve has connection point d. A fourth control valve is connected to connection point d. The fourth control valve is connected to the fifth control valve. The fifth control valve is connected to connection point c. The pipeline connecting the fourth control valve and the fifth control valve has connection point e. Connection points a and e are connected through a permeable energy storage pipe.

[0009] The brine tank, brine pump, third control valve, fourth control valve, fifth control valve, sixth control valve, salt plant, and permeation energy storage pipe constitute a reverse osmosis energy storage system;

[0010] The system comprises a clear water tank, a first control valve, a second control valve, a permeation energy storage pipe, a brine tank, a brine pump, a third control valve, a fourth control valve, a sixth control valve, and a turbine mechanism, forming a salinity gradient power generation system. By coupling well and mineral salt mining with salinity gradient energy and reverse osmosis technology, and utilizing the large amount of fresh water and concentrated brine system that is indispensable in the well and mineral salt mining process, the system can generate electricity using the salinity gradient energy contained in the concentrated brine produced during well and mineral salt mining without affecting normal production operations. It can also recover and utilize "wasted" electricity from the power grid and increase the concentration of brine delivered to the salt plant.

[0011] The energy storage system further includes a water pump and a water source, the water source and the water pump are connected, the water pump and the clean water tank are connected, and the water pump is used to pump water from the water source into the clean water tank.

[0012] The energy storage system further includes a clean water pump, a clean water tank, and an input connection to the clean water pump, while the output connection of the clean water pump is connected to the brine tank.

[0013] Furthermore, the permeation energy storage pipe has a three-layer concentric sleeve structure, consisting of a permeation pipe, a central pipe, and an intermediate pipe from the inside out.

[0014] Furthermore, the permeation tube wall is a semi-permeable membrane.

[0015] It further includes a central tube and intermediate tubes made of steel pipes.

[0016] The beneficial effects of this utility model are as follows: This utility model provides an energy storage system based on well and mine salt mining technology, which utilizes the natural preheating effect of geothermal resources on brine (temperature > 30℃), eliminating the need for heating equipment in traditional salinity gradient power generation and improving power generation efficiency; it reduces costs by replacing part of the pumping energy consumption with the gravitational potential energy of the clear water tank and brine tank, thereby reducing the energy consumption of the system equipment; it also promotes resource recycling by using surplus electricity from grid peak shaving to directly meet the needs of the salt plant after reverse osmosis concentration of brine, and the diluted liquid after power generation can be reinjected into the brine well for recycling. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the permeation energy storage tube of this utility model.

[0020] In the diagram: 1. Water source; 2. Water pump; 3. Clean water tank; 4. Clean water pump; 5. Brine well; 6. Brine tank; 7. Brine pump; 8. Saltworks; 9. Water turbine; 10. First control valve; 11. Second control valve;

[0021] 12. Permeation energy storage pipe; 1201, Permeation pipe; 1202, Central pipe; 1203, Intermediate pipe; 1204, First valve of permeation pipe; 1205, First valve of central pipe; 1206, First valve of intermediate pipe; 1207, Second valve of permeation pipe; 1208, Second valve of central pipe; 1209, Second valve of intermediate pipe; 1210, Third valve of intermediate pipe; 1211, Third valve of central pipe; 1212, Third valve of permeation pipe; 1213, Fourth valve of intermediate pipe; 1214, Fourth valve of central pipe; 1215, Fourth valve of permeation pipe;

[0022] 13. Third control valve; 14. Fourth control valve; 15. Fifth control valve; 16. Sixth control valve; 17. Connection point a; 18. Connection point b; 19. Connection point c; 20. Connection point d; 21. Connection point e. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] like Figure 1 This is a schematic diagram of the structure of the present invention, an energy storage system based on well and mine salt mining technology, including a clean water tank 3, a brine well 5, a brine tank 6, a brine pump 7, and a salt plant 8;

[0025] The clear water tank 3 is connected to the brine well 5. The clear water tank 3 is used to inject clear water into the brine well 5. The brine well 5 is connected to the brine tank 6. The brine tank 6 is used to store the brine output from the brine well 5. The brine tank 6 is connected to the brine pump 7. The brine pump 7 is connected to the salt plant 8. The brine level in the brine tank 6 is not less than 10m, the brine temperature is greater than 30℃, and the sodium chloride concentration is greater than 250g / L to ensure gravitational potential energy and osmotic pressure difference.

[0026] The clear water tank 3 is connected to a water turbine 9 and a second control valve 11. A first control valve 10 is provided on the pipeline connecting the second control valve 11 and the water turbine 9. A connection point a17 is provided on the pipeline connecting the first control valve 10 and the second control valve 11.

[0027] The brine tank 6 is connected to a third control valve 13. The pipeline connecting the brine pump 7 and the salt plant 8 has connection points b18 and c19. The third control valve 13 is connected to the sixth control valve 16 and connection point b18. The pipeline connecting the third control valve 13 and the sixth control valve 16 has connection point d20. The fourth control valve 14 is connected to connection point d20. The fourth control valve 14 is connected to the fifth control valve 15. The fifth control valve 15 is connected to connection point c19. The pipeline connecting the fourth control valve 14 and the fifth control valve 15 has connection point e21. Connection points a17 and e21 are connected by a permeation energy storage pipe 12.

[0028] The brine tank 6, brine pump 7, third control valve 13, fourth control valve 14, fifth control valve 15, sixth control valve 16, salt plant 8, and permeation energy storage pipe 12 constitute a reverse osmosis energy storage system.

[0029] The system comprises a clear water tank 3, a first control valve 10, a second control valve 11, a permeation energy storage pipe 12, a brine tank 6, a brine pump 7, a third control valve 13, a fourth control valve 14, a sixth control valve 16, and a water turbine 9, forming a salinity gradient power generation system. It utilizes the natural preheating effect of geothermal resources on the brine (temperature > 30℃), eliminating the need for heating equipment in traditional salinity gradient power generation and improving power generation efficiency. Costs are reduced by using the gravitational potential energy of the clear water and brine tanks to replace some of the pumping energy consumption, thus reducing system equipment energy consumption. Resources are recycled; the brine concentrated by reverse osmosis, using surplus electricity from the power grid during peak shaving, directly meets the needs of the salt plant, and the diluted liquid after power generation can be reinjected into the brine well for recycling.

[0030] This energy storage system couples well and mineral salt mining with salinity gradient energy and reverse osmosis technology. By utilizing the large amount of fresh water and concentrated brine system that is indispensable in the well and mineral salt mining process, it can generate electricity using the salinity gradient energy contained in the concentrated brine produced during well and mineral salt mining without affecting normal production operations. It can also recover and utilize the "wasted electricity" from the power grid and increase the concentration of brine delivered to the salt plant.

[0031] The energy storage system also includes a water pump 2 and a water source 1. The water source 1 is connected to the water pump 2, and the water pump 2 is connected to a clean water tank 3. The water pump 2 is used to pump water from the water source 1 into the clean water tank 3.

[0032] The energy storage system also includes a clean water pump 4, a clean water tank 3, and the input end of the clean water pump 4 is connected. The output end of the clean water pump 4 is connected to the brine tank 6.

[0033] like Figure 2As shown, the permeation energy storage tube 12 has a three-layer concentric sleeve structure, consisting of a permeation tube 1201, a central tube 1202, and an intermediate tube 1203 from the inside out. By utilizing the spatial separation characteristics of the three-layer concentric sleeve structure of the permeation energy storage tube, fresh water and brine can flow relative to each other inside and outside the permeation tube, thereby achieving effective cleaning of the permeation membrane.

[0034] The wall of the permeation tube 1201 is a semi-permeable membrane, while the central tube 1202 and the intermediate tube 1203 are steel pipes.

[0035] Working process: When the system is in basic production state, the water pump 2, the clean water pump 4 and the brine pump 7 are turned on, and the relevant valves 10-16 of the energy storage system are closed. First, the fresh water in the fresh water source 1 is drawn by the water pump 2 and stored in the clean water tank 3. Then, the clean water pump 4 pressurizes the fresh water in the clean water tank 3 and then transports it to each brine well 5 through the water injection pipeline. The brine formed by dissolving salt rock is discharged through the brine well 5 and flows to the brine tank 6. After being pressurized by the brine pump 7, it is transported to the salt plant 8 through the brine pipeline.

[0036] When using surplus power from the grid for reverse osmosis brine concentration, the sixth valve 16, the fourth valve 14, the third valve 1212 of the permeate tube, the first valve 1205 of the central tube, the second valve 1207 of the permeate tube, the second valve 1209 of the intermediate tube, the fourth valve 1213 of the intermediate tube, the fifth valve 15, and the second valve 11 are opened sequentially. The brine is pumped to a certain pressure by the brine pump 7 and then transported to the permeate tube 1201. With the help of the pressure from the brine pump 7, the brine is concentrated through the permeate tube 1201 by reverse osmosis. Under the pressure higher than the osmotic pressure, water molecules pass through the semi-permeable membrane wall of the permeate tube 1201 to separate fresh water into the central tube 1202. The fresh water flows in the central tube 1202 and flows back to the clear water tank 3 through the first valve 1205 and the second valve 11 of the central tube. The brine in the permeate tube 1201 is concentrated and the concentration is increased. It is then transported to the salt plant through the second valve 1207 of the permeate tube, the second valve 1209 of the intermediate tube, the fourth valve 1213 of the intermediate tube, and the fifth valve 15.

[0037] When generating electricity using the salinity gradient between fresh water and brine, the following valves are opened in sequence: second valve 11, first valve 1204 of the permeation pipe, sixth valve 16, fourth valve 14, third valve 1211 of the central pipe, second valve 1208 of the central pipe, and first valve 10. Fresh water flows into the permeation pipe 1201 through the second valve 11. Brine is pressurized by the brine pump 7 and transported to the central pipe 1202. The brine in the central pipe 1202 draws fresh water from the permeation pipe 1201 to the brine side, increasing the osmotic pressure. Pressure water flow is generated in the central pipe 1202, which drives the turbine 9 to generate electricity through the second valve 1208 and the first valve 10 of the central pipe. The tailwater after power generation is recycled to the clean water tank for reuse.

[0038] When the brine tank level is higher than 10m, the brine pressurization method can be switched to gravity drive mode. The sixth valve 16 is closed and the third valve 13 is opened. The gravitational potential energy of the brine in the brine tank 6 is used to directly drive the brine into the permeation energy storage pipe 12, reducing the energy consumption of the brine pump.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An energy storage system based on well-mined salt mining technology, characterized in that, It includes a clear water tank (3), a brine well (5), a brine tank (6), a brine pump (7), and a salt plant (8); The clear water tank (3) is connected to the brine well (5). The clear water tank (3) is used to inject clear water into the brine well (5). The brine well (5) is connected to the brine tank (6). The brine tank (6) is used to store the brine output from the brine well (5). The brine tank (6) is connected to the brine pump (7). The brine pump (7) is connected to the salt plant (8). The water tank (3) is connected to a water turbine (9) and a second control valve (11). A first control valve (10) is provided on the pipeline connecting the second control valve (11) and the water turbine (9). A connection point a (17) is provided on the pipeline connecting the first control valve (10) and the second control valve (11). The brine tank (6) is connected to a third control valve (13). The pipeline connecting the brine pump (7) and the salt plant (8) has connection points b (18) and c (19). The third control valve (13) is connected to the connection point b (18) via a sixth control valve (16). The pipeline connecting the third control valve (13) and the sixth control valve (16) has connection point d (20). A fourth control valve (14) is connected to the connection point d (20). The fourth control valve (14) is connected to the fifth control valve (15). The fifth control valve (15) is connected to the connection point c (19). The pipeline connecting the fourth control valve (14) and the fifth control valve (15) has connection point e (21). The connection points a (17) and e (21) are connected via a permeation energy storage pipe (12). The brine tank (6), brine pump (7), third control valve (13), fourth control valve (14), fifth control valve (15), sixth control valve (16), salt plant (8), and permeation energy storage pipe (12) constitute a reverse osmosis energy storage system; The clean water tank (3), the first control valve (10), the second control valve (11), the permeation energy storage pipe (12), the brine tank (6), the brine pump (7), the third control valve (13), the fourth control valve (14), the sixth control valve (16), and the water turbine (9) constitute a salinity difference power generation system.

2. The energy storage system based on well-mined salt mining technology as described in claim 1, characterized in that: The energy storage system also includes a water pump (2) and a water source (1), the water source (1) and the water pump (2) are connected, the water pump (2) and the clean water tank (3) are connected, and the water pump (2) is used to pump water from the water source (1) into the clean water tank (3).

3. The energy storage system based on well salt mining technology as described in claim 1, characterized in that: The energy storage system also includes a clean water pump (4), the clean water tank (3) and the input end of the clean water pump (4) are connected, and the output end of the clean water pump (4) is connected to the brine tank (6).

4. The energy storage system based on well salt mining technology as described in claim 1, characterized in that: The permeation energy storage pipe (12) has a three-layer concentric sleeve structure, consisting of a permeation pipe (1201), a central pipe (1202), and an intermediate pipe (1203) from the inside out.

5. The energy storage system based on well-mined salt mining technology as described in claim 4, characterized in that: The wall of the permeation tube (1201) is a semi-permeable membrane.

6. The energy storage system based on well-mined salt mining technology as described in claim 4, characterized in that: The central tube (1202) and the intermediate tube (1203) are steel pipes.

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