A gravity-flow air-compressed water diversion system and method for salt lakes

Abstract

This invention provides a gravity-flow air-pressure water diversion system and method for salt lakes. The water diversion system includes a gravity-flow pipe, a collection well, an air pump, a storage well, and a control system. The top surface of the collection well is lower than the water surface of the salt lake. One end of the gravity-flow pipe is immersed in the salt lake, and the other end extends over the salt lake bank into the collection well. The inlet end of the gravity-flow pipe in the salt lake is higher than the outlet end in the collection well. An electric shut-off valve is installed at the inlet of the gravity-flow pipe. The air pump is used to inject high-pressure gas into the collection well or to extract air. The bottom surface of the storage well is higher than the water surface of the salt drying pond. The collection well is connected to the top of the storage well through a water guide pipe. A water supply pipe leading to the salt drying pond is provided at the bottom of the storage well. An electric shut-off valve is installed at the outlet of the water guide pipe. This invention utilizes the principle of gravity-flow of low-liquid-level water and the principle of high-pressure air-pressure water extraction to extract brine, without using a water pump for suction. This avoids the pump blades coming into contact with brine crystals, thereby reducing pump failure, lowering pumping costs, and improving pumping efficiency.

Description

Technical Field

[0001] This invention relates to the field of brine extraction technology from salt lakes, and in particular to a gravity-flow air-compressed water diversion system and method for salt lakes. Background Technology

[0002] Salt lake brine is rich in minerals and is a valuable mineral resource. To facilitate processing and purification, water pumps are typically used to pump the brine to salt-drying ponds, where it is exposed to sunlight to increase its concentration. During the pumping process, when the brine is disturbed, crystals easily form on the pipe walls and pump blades. Crystallization on the pump blades can overload the pump, causing it to jam or become damaged, thus affecting pumping efficiency and increasing pumping costs. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by providing a salt lake gravity-flow air-pressure water extraction system and method. This method utilizes the principle of low-level water gravity flow and the principle of high-pressure air-pressure water extraction to extract brine, without using a water pump for suction, thus avoiding pump blades contacting brine crystals, reducing pump failures, lowering pumping costs, and improving pumping efficiency.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a gravity-flow compressed air water diversion system for salt lakes. The system includes a gravity-flow pipe, a collection well, an air pump, a storage well, and a control system. The collection well is a sealed well body buried underground near the salt lake, with its top surface lower than the water surface of the salt lake. One end of the gravity-flow pipe is immersed in the salt lake, and the other end extends over the salt lake bank and into the collection well. The inlet end of the gravity-flow pipe in the salt lake is higher than the outlet end in the collection well. An inlet electric shut-off valve is provided at the connection point between the gravity-flow pipe and the collection well. The air pump is installed on the top of the collection well and connected to an air supply pipe at the top of the collection well for injecting high-pressure gas or evacuating air from the collection well. The storage well is installed on the ground, with its bottom surface higher than the water surface of the salt drying pond. The collection well is connected to the top of the storage well via a water guide pipe. A water supply pipe leading to the salt drying pond is provided at the bottom of the storage well. An outlet electric shut-off valve is provided at the end of the water guide pipe near the collection well.

[0005] The control system includes a control module and a pressure sensor, an upper liquid level sensor, and a lower liquid level sensor installed in the water collection well. The upper and lower liquid level sensors are respectively located at the upper and lower parts of the water collection well, with the lower liquid level sensor higher than the outlet end of the gravity flow pipe. The pressure sensor is located higher than the upper liquid level sensor. The signal output terminals of the pressure sensor, upper liquid level sensor, and lower liquid level sensor are connected to the signal input terminal of the control module. The signal output terminal of the control module is connected to the control terminals of the inlet electric shut-off valve, the air pump, and the outlet electric shut-off valve, respectively.

[0006] The preferred technical solution of the present invention is as follows: the water collection well is a reinforced concrete sealed well, and the air pressure inside the well is not higher than 0.35MPa; the gravity flow pipe extends into the water collection well from the middle and lower part, and the outlet of the gravity flow pipe extends to the bottom of the water collection well. The outer wall of the gravity flow pipe is sealed to the well wall of the water collection well. A water outlet interface is provided at the bottom of the other side wall of the water collection well. The inlet of the water guide pipe is sealed to the outlet interface.

[0007] The preferred technical solution of the present invention is as follows: the lower liquid level sensor is higher than the connection between the water guide pipe and the water collection well; the height difference between the top of the water storage well and the location of the lower liquid level sensor in the water collection well is no more than 15 meters.

[0008] The preferred technical solution of the present invention is that both the gravity flow pipe and the water guide pipe are made of rolled steel, and the gravity flow pipe is laid along the embankment of the salt lake.

[0009] The preferred technical solution of the present invention is as follows: the water storage well is a rectangular reinforced concrete closed well with a depth of 4 to 6 m, and a gas transmission pipe is provided at the top of the well. The air inside the water storage well is at normal pressure.

[0010] The preferred technical solution of the present invention is that the height of the water collection well is 4 to 6 m, and the internal air pressure of the water collection well is not less than 0.35 MPa.

[0011] This invention also provides a method for gravity-flow air-compressed water diversion from a salt lake. The method uses the aforementioned gravity-flow air-compressed water diversion system to introduce water from the salt lake into a salt-drying pond. The method specifically includes the following steps:

[0012] S1. Based on the height difference between the top of the water storage well and the bottom of the water collection well, and the maximum withstand pressure of the water collection well, the power value P of the air pump's compressed air work is calculated and determined. 压 The selection range is determined, and the power value P of the air pump is calculated based on the height difference between the salt lake surface and the salt lake dam. 抽 The selection range is determined, and the rated power P of the air pump is selected. The air pump that meets the requirements is installed on the top of the water collection well for injecting high-pressure gas into the water collection well or for pumping air out.

[0013] S2. Control the air pump to perform pumping work according to the value P calculated in step S1. 抽 The process involves air extraction and water diversion. The inlet electric shut-off valve opens, the outlet electric shut-off valve closes, and the air pump is activated to create negative pressure in the collection well. The brine from the salt lake is then forced into the collection well by atmospheric pressure through a gravity flow pipe. When the liquid level inside the collection well reaches the lower level sensor, the liquid level submerges the inlet of the gravity flow pipe. The brine then flows into the collection well by gravity, utilizing the height difference between the salt lake and the collection well, creating a gravity-flow environment. At this point, the lower level sensor sends a signal to the control module, which then stops the air pump.

[0014] S3. When the liquid level inside the collection well reaches the upper liquid level sensor, the inlet electric shut-off valve is closed and the outlet electric shut-off valve is opened. At the same time, the air pump is turned on, and the power output P calculated in step S1 is taken as the value of the compressed air work done by the air pump. 压 The brine in the collection well is compressed by high-pressure air into the storage well. The brine in the storage well flows into the water pipe by gravity, and then flows into the salt pond along the water pipe.

[0015] A further technical solution of the present invention: the power output of the air pump in step S1 is P. 抽 The control range is as follows:

[0016] ①

[0017] In step S1, the power output of the air pump compressing air is taken as P. 压 The control range is as follows:

[0018] ②

[0019] ③

[0020] ④

[0021] The rated power P of the air pump in step S1 simultaneously satisfies formulas ①, ②, ③ and ④ above;

[0022] In formulas ①, ②, ③, and ④ above: For safety, a factor of 1.1 is used. The density of the brine, The density of pure water, It is the acceleration due to gravity. The flow rate of the gravity flow pipe is... The flow rate of the water pipe. The difference in elevation between the salt lake surface and the salt lake dam. The difference in liquid level between the top of the storage well and the bottom of the collection well. The maximum withstand pressure of the water collection well. Standard atmospheric pressure For pump efficiency, The brine head height is 1 standard atmosphere.

[0023] The preferred technical solution of this invention is as follows: In the water diversion process of step S3, when the liquid level in the collecting well drops to the lower liquid level sensor, the air pump is controlled to shut off. The high-pressure air in the collecting well continues to pressurize some brine into the storage well. At the same time, the high-pressure air overflows from the air pump port. When the air pressure sensor detects that the air pressure in the collecting well has dropped to normal pressure, if brine diversion continues, the inlet electric shut-off valve is controlled to open, and the brine continues to flow into the collecting well by gravity. If brine diversion stops, the inlet electric shut-off valve is no longer opened, and the process ends.

[0024] The preferred technical solution of the present invention is as follows: In step S3, when water is introduced into the water storage well, air is vented through the air supply pipe to ensure that the air inside the water storage well is at normal pressure.

[0025] This invention utilizes the principle of low-level water gravity flow and high-pressure air pressure to extract brine, eliminating the need for a water pump. This avoids contact between the pump blades and the brine, preventing brine crystallization on the pump blades and thus avoiding pump malfunctions. It also reduces pump maintenance costs, thereby lowering the cost of pumping brine from salt lakes and improving pumping efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the water diversion system in this invention;

[0027] Figure 2 This is a schematic diagram of the water diversion process of the water diversion system in this invention;

[0028] Figure 3 This is a schematic diagram of the working process of the water diversion system of the present invention;

[0029] Figure 4 This is a block diagram illustrating the control principle of the water diversion system in this invention.

[0030] In the diagram: 1. Gravity flow pipe; 2. Inlet electric shut-off valve; 3. Collection well; 4. Air pump; 5. Air pressure sensor; 6. Upper liquid level sensor; 7. Lower liquid level sensor; 8. Outlet electric shut-off valve; 9. Water guide pipe; 10. Water storage well; 11. Air transmission pipe; 12. Water transmission pipe; 13. Salt lake; 14. Salt lake bank; 15. Salt drying pond; 16. Control module. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings are drawn in a simplified manner and are only used to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1 provides a salt lake gravity-flow air-compressed water diversion system, such as... Figure 1 and Figure 2As shown, the water diversion system includes a gravity flow pipe 1, a water collection well 3, an air pump 4, a water storage well 10, and a control system. The water collection well 3 is a reinforced concrete sealed well buried underground near the salt lake 13. The depth of the water collection well 3 is about 5m, and its top is exposed above the ground to facilitate the installation of the air pump 4. The air pressure inside the water collection well 3 does not exceed 0.35MPa. The water storage well 10 is a rectangular reinforced concrete sealed well with a depth of about 5m. An air supply pipe 11 is installed at its top for venting air when water enters the water storage well 10 and absorbing air when water exits, ensuring that the air inside the water storage well 10 is at normal pressure. The top surface of the collection well 3 is lower than the water surface of the salt lake 13. One end of the gravity flow pipe 1 is immersed in the salt lake 13, and the other end extends over the salt lake bank 14 and into the collection well 3. The inlet end of the gravity flow pipe 1 in the salt lake 13 is higher than the outlet end in the collection well 3. An inlet electric shut-off valve 2 is provided at the connection point of the gravity flow pipe 1 near the collection well 3. The air pump 4 is installed on the top of the collection well 3 and connected to the air supply pipe on the top of the collection well 3 for injecting high-pressure gas into the collection well 3 or for evacuating air. The water storage well 10 is installed on the ground, and the bottom surface of the water storage well 10 is higher than the ground surface. At the surface of the salt pond 15, the water collection well 3 is connected to the top of the water storage well 10 through the water guide pipe 9. The bottom of the water storage well 3 is provided with a water supply pipe 12 leading to the salt pond 15. An electric shut-off valve 8 is provided at the end of the water guide pipe 9 near the water collection well 3. The gravity flow pipe 1 extends into the water collection well 3 from the middle and lower part of the water collection well 3, and the outlet of the gravity flow pipe 1 extends to the bottom of the water collection well 3. The outer wall of the gravity flow pipe 1 is sealed to the well wall of the water collection well 3. An outlet interface is provided at the bottom of the other side wall of the water collection well 3. The inlet of the water guide pipe 9 is sealed to the outlet interface.

[0033] In Example 1, both the gravity flow pipe 1 and the water guide pipe 9 are made of rolled steel. The gravity flow pipe 1 is laid along the dam of the salt lake 14. The internal pressure resistance of the water collection well 3 is not less than 0.35 MPa.

[0034] In Example 1, as Figures 1 to 4As shown, the control system includes a control module 16 and a pressure sensor 5, an upper liquid level sensor 6, and a lower liquid level sensor 7 installed in the water collection well 3. The control module 16 can be a control box or control cabinet, with an internal PLC controller and an external control panel and control buttons. The inlet electric shut-off valve 2 and the outlet electric shut-off valve 8 are electrically operated and can be electrically controlled to open or close. The upper liquid level sensor 6 and the lower liquid level sensor 7 are respectively installed at the upper and lower parts of the water collection well 3, with the lower liquid level sensor 7 higher than the outlet end of the gravity flow pipe 1. The pressure sensor 5 is installed higher than the upper liquid level sensor 6. The pressure sensor 5 is used to detect the air pressure in the water collection well 3, the upper liquid level sensor 6 can detect the highest brine level, and the lower liquid level sensor 7 can detect the lowest brine level. The signal output terminals of the pressure sensor 5, the upper liquid level sensor 6, and the lower liquid level sensor 7 are connected to the signal input terminals of the control module 16, and the signal output terminals of the control module 16 are respectively connected to the control terminals of the inlet electric shut-off valve 2, the air pump 4, and the outlet electric shut-off valve 8. The lower liquid level sensor 7 is located above the connection point between the water guide pipe 9 and the water collection well 3; the height difference between the top of the water storage well 10 and the location of the lower liquid level sensor 7 inside the water collection well 3 is no more than 15 meters.

[0035] The working process of Example 1 is as follows: The control module 16 controls the inlet electric shut-off valve 2 to open, the outlet electric shut-off valve 8 to close, and the air pump 4 to pump air, drawing the brine from the salt lake into the collection well 3; when the brine level in the collection well 3 reaches the height of the lower level sensor 7, it has already submerged the inlet of the gravity flow pipe. At this time, the lower level sensor 7 transmits a signal to the control module 16, and the control module 16 controls the air pump 4 to close, allowing the brine to flow into the collection well 3 by gravity. When the liquid level in the collection well 3 reaches the upper liquid level sensor 6, the upper liquid level sensor 6 transmits a signal to the control module 16. The control module 16 controls the inlet electric shut-off valve 2 to close, opens the outlet electric shut-off valve 8, and starts the air pump 4 to compress air. The brine in the collection well 3 is forced into the storage well 10 by the high-pressure air. The brine in the storage well 10 flows into the water delivery pipe 12 by gravity, and then flows into the salt drying pond 15 along the water delivery pipe 12. During this process, the air pressure sensor 5 monitors the air pressure in the collection well 3 to ensure that it does not exceed 0.35 MPa. If it exceeds this level, a signal is transmitted to the control module 16, and the control module 16 controls the air pump 4 to close to prevent accidents.

[0036] During the water diversion process, when the liquid level in the collection well 3 drops to the lower liquid level sensor 7, the lower liquid level sensor 7 transmits a signal to the control module 16, and the control module 16 controls the air pump 4 to shut down. After a one-minute delay, during this delay, the high-pressure air in the collection well 3 continues to pressurize some brine into the storage well 10. At the same time, the high-pressure air overflows from the pump port of the air pump 4 and monitors the air pressure in the collection well 3 through the air pressure sensor 5. When the air pressure sensor 5 detects that the air pressure in the collection well 3 has dropped to normal pressure, if the brine diversion continues, the inlet electric shut-off valve 2 is opened, and the brine continues to flow into the collection well 3 by gravity. If the brine diversion stops, the inlet electric shut-off valve 2 is no longer opened, and the process ends.

[0037] Example 2 provides a method for gravity-flow air-compressed water diversion from a salt lake. This method uses the gravity-flow air-compressed water diversion system described in Example 1 to introduce water from the salt lake into a salt-drying pond. Specifically, it includes the following steps:

[0038] S1. Based on the height difference between the top of water storage well 10 and the bottom of water collection well 3, and the maximum withstand air pressure of the water collection well, the power value P of the air pump for compressed air work is calculated and determined. 压 The selection range is determined, and the power value P of the air pump is calculated based on the height difference between the salt lake surface and the salt lake dam. 抽 The selection range is determined, and the rated power P of the air pump is selected. The air pump that meets the requirements is installed on the top of the water collection well for injecting high-pressure gas into the water collection well or for pumping air out.

[0039] Among them, the power output of the air pump is P. 抽 The control range is as follows:

[0040] ①

[0041] The power output of an air pump is P. 压 The control range is as follows:

[0042] ②

[0043] ③

[0044] ④

[0045] The rated power P of the air pump simultaneously satisfies formulas ①, ②, ③ and ④ above;

[0046] In formulas ①, ②, ③, and ④ above: For safety, a factor of 1.1 is used. The density of the brine, The density of pure water, It is the acceleration due to gravity. The flow rate of the gravity flow pipe is... The flow rate of the water pipe. The difference in elevation between the salt lake surface and the salt lake dam. The difference in liquid level between the top of the storage well and the bottom of the collection well. The maximum withstand pressure of the water collection well. Standard atmospheric pressure For pump efficiency, The brine head height is 1 standard atmosphere.

[0047] In Example 2, the salt lake water level is 0m, the salt lake dam height is 0.7m, and the brine density is 1.3t / m³; the standard water level of the salt-drying pond is 3m, and the standard atmospheric pressure is 0.1MPa. The collection well has a volume of 50m³, a depth of 5m, a top height of -1m, an upper level sensor height of -1.1m, a lower level sensor height of -5.8m, and a bottom height of -6m; the storage well has a volume of 50m³, a depth of 5m, a top height of 9m, and a bottom height of 4m; the gravity flow rate is 1m³ / s; and the water diversion pipe has a flow rate of 1m³ / s.

[0048] The calculation process for the air pump's pumping power is as follows:

[0049]

[0050] The calculation process for the compressed air power of an air pump is as follows:

[0051]

[0052]

[0053] Based on the above calculations, the rated power P of control pump 4 can be determined as follows:

[0054] .

[0055] S2. First, control the pumping power P of air pump 4. 抽 To meet the above calculation requirements, air extraction and water diversion are performed. The inlet electric shut-off valve 2 is opened, and the outlet electric shut-off valve 8 is closed. The air pump 4 is turned on to extract air, creating a negative pressure in the collection well 3. The brine from the salt lake is then forced into the collection well 3 by the external atmospheric pressure through the gravity flow pipe 1. When the liquid level inside the collection well 3 reaches the lower liquid level sensor 7, the liquid level inside the collection well 3 submerges the inlet of the gravity flow pipe 1. The brine then flows into the collection well 3 by gravity using the liquid level difference between the salt lake and the collection well 3, creating a gravity flow environment for the brine. At this time, the lower liquid level sensor 7 sends a signal to the control module 16, which controls the air pump 4 to stop extracting air.

[0056] S3. When the liquid level inside the water collection well 3 reaches the upper liquid level sensor 6, the inlet electric shut-off valve 2 is closed and the outlet electric shut-off valve 8 is opened. At the same time, the air pump 4 is turned on, and the pressure power P of the air pump 4 is adjusted. 压 To meet the above calculation requirements, the brine in the collecting well 3 is forced into the storage well 10 by high-pressure air. The brine in the storage well 10 flows into the water supply pipe 12 by gravity, and then flows into the salt pond 15 along the water supply pipe 12. During the water intake process, when the liquid level in the collecting well 3 drops to the lower liquid level sensor 7, the air pump 4 is turned off. The high-pressure air in the collecting well 3 continues to force some brine into the storage well 10, and at the same time, the high-pressure air overflows from the pump port of the air pump 4. After a one-minute delay, when the air pressure sensor 5 detects that the air pressure in the collecting well has dropped to normal pressure, if the brine intake continues, the inlet electric shut-off valve 2 is opened, and the brine continues to flow into the collecting well by gravity. If the brine intake stops, the inlet electric shut-off valve 2 is not opened, and the process ends. When water enters the storage well 10, the air is vented through the air supply pipe 11 to ensure that the air inside the storage well 10 is at normal pressure.

[0057] The above description is merely one embodiment of the present invention, and while it is detailed and specific, it should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A gravity-fed compressed air water diversion system for salt lakes, characterized in that: The water diversion system includes a gravity pipe (1), a collection well (3), an air pump (4), a water storage well (10), and a control system. The collection well (3) is a sealed well body buried underground near the salt lake (13). The top surface of the collection well (3) is lower than the water surface of the salt lake (13). One end of the gravity pipe (1) is immersed in the salt lake (13), and the other end is crossed over the salt lake bank (14) and extended into the collection well (3). The water inlet of the gravity pipe (1) in the salt lake (13) is higher than the water outlet in the collection well (3). An inlet is provided at the connection point of the gravity pipe (1) near the collection well (3). Electric shut-off valve (2); The air pump (4) is installed on the top of the water collection well (3) and connected to the air supply pipe on the top of the water collection well (3) for injecting high-pressure gas into the water collection well (3) or evacuating air; The water storage well (10) is installed on the ground and the bottom surface of the water storage well (10) is higher than the water surface of the salt drying pond (15). The water collection well (3) is connected to the top of the water storage well (10) through the water guide pipe (9). The bottom of the water storage well (10) is provided with a water supply pipe (12) leading to the salt drying pond (15). An outlet electric shut-off valve (8) is provided at one end of the water guide pipe (9) near the water collection well (3). The control system includes a control module (16) and a pressure sensor (5), an upper liquid level sensor (6), and a lower liquid level sensor (7) installed in the water collection well (3). The upper liquid level sensor (6) and the lower liquid level sensor (7) are respectively installed at the upper and lower parts of the water collection well (3), and the lower liquid level sensor (7) is higher than the outlet end of the gravity flow pipe (1). The pressure sensor (5) is installed at a position higher than the upper liquid level sensor (6). The signal output terminals of the pressure sensor (5), the upper liquid level sensor (6), and the lower liquid level sensor (7) are connected to the signal input terminal of the control module (16). The signal output terminal of the control module (16) is connected to the control terminals of the inlet electric shut-off valve (2), the air pump (4), and the outlet electric shut-off valve (8).

2. The salt lake gravity-flow air-compressed water diversion system according to claim 1, characterized in that: The water collection well (3) is a reinforced concrete sealed well, and the air pressure inside the well is not higher than 0.35MPa; the gravity flow pipe (1) extends into the water collection well (3) from the middle and lower part of the water collection well (3), and the outlet of the gravity flow pipe (1) extends to the bottom of the water collection well (3). The outer wall of the gravity flow pipe (1) is sealed to the well wall of the water collection well (3). A water outlet is provided at the bottom of the other side wall of the water collection well (3). The inlet of the water guide pipe (9) is sealed to the outlet.

3. A salt lake gravity-flow air-compressed water diversion system according to claim 1 or 2, characterized in that: The lower liquid level sensor (7) is higher than the connection between the water pipe (9) and the water collection well (3); the height difference between the top of the water storage well (10) and the location of the lower liquid level sensor (7) in the water collection well (3) is no more than 15 meters.

4. A salt lake gravity-flow air-compressed water diversion system according to claim 1 or 2, characterized in that: Both the gravity flow pipe (1) and the water guide pipe (9) are made of rolled steel. The gravity flow pipe (1) is laid along the embankment of the salt lake (13).

5. A salt lake gravity-flow air-compressed water diversion system according to claim 1 or 2, characterized in that: The water storage well (10) is a rectangular reinforced concrete closed well with a depth of 4 to 6 m. A gas transmission pipe (11) is provided at the top of the well. The air inside the water storage well (10) is at normal pressure.

6. A salt lake gravity-flow air-compressed water diversion system according to claim 1 or 2, characterized in that: The height of the water collection well (3) is 4 to 6 m, and the internal pressure of the water collection well (3) is not less than 0.35 MPa.

7. A method for gravity-fed pneumatic water diversion in a salt lake, characterized in that, The method uses the salt lake gravity-flow air-compressed water diversion system according to any one of claims 1 to 6 to introduce water from the salt lake into the salt-drying pond, and the method specifically includes the following steps: S1. Based on the height difference between the top of the water storage well and the bottom of the water collection well, and the maximum withstand air pressure of the water collection well, the value of the air pump's compressed air power P is calculated and determined. 压 The selection range is determined, and the air pump's pumping power value P is calculated based on the height difference between the salt lake surface and the salt lake dam. 抽 The selection range is determined, and the rated power P of the air pump is selected. The air pump that meets the requirements is installed on the top of the water collection well for injecting high-pressure gas into the water collection well or for pumping air out. S2. Control the air pump to take the pumping power value P calculated in step S1. 抽 The process involves air extraction and water diversion. The inlet electric shut-off valve opens, the outlet electric shut-off valve closes, and the air pump is activated to create negative pressure in the collection well. The brine from the salt lake is then forced into the collection well by atmospheric pressure through a gravity flow pipe. When the liquid level inside the collection well reaches the lower level sensor, the liquid level submerges the inlet of the gravity flow pipe. The brine then flows into the collection well by gravity, utilizing the height difference between the salt lake and the collection well, creating a gravity-flow environment. At this point, the lower level sensor sends a signal to the control module, which then stops the air pump. S3. When the liquid level inside the collection well reaches the upper liquid level sensor, control the inlet electric shut-off valve to close and the outlet electric shut-off valve to open. At the same time, control the air pump to start, and take the air pump's compressed power P calculated in step S1. 压 The brine in the collection well is compressed by high-pressure air into the storage well. The brine in the storage well flows into the water pipe by gravity, and then flows into the salt pond along the water pipe.

8. The method for gravity-fed pneumatic water diversion in a salt lake according to claim 7, characterized in that, In step S1, the power output of the air pump is P. 抽 The control range is as follows: ① In step S1, the power output of the air pump is P. 压 The control range is as follows: ② ③ ④ The rated power P of the air pump in step S1 simultaneously satisfies formulas ①, ②, ③ and ④ above; In formulas ①, ②, ③ and ④ above: For safety, a factor of 1.1 is used. The density of the brine, The density of pure water, It is the acceleration due to gravity. The flow rate of the gravity flow pipe is... The flow rate of the water pipe. The difference in elevation between the salt lake surface and the salt lake dam. The difference in liquid level between the top of the storage well and the bottom of the collection well. The maximum withstand pressure of the water collection well. Standard atmospheric pressure For pump efficiency, The brine head height is 1 standard atmosphere.

9. A method for gravity-fed pneumatic water diversion from a salt lake according to claim 7 or 8, characterized in that: In step S3, during the water intake process, when the water level in the collection well drops to the lower level sensor, the air pump is shut off. High-pressure air in the collection well continues to pressurize some brine into the storage well, while high-pressure air overflows from the air pump outlet. When the air pressure sensor detects that the air pressure in the collection well has dropped to normal pressure, if brine intake continues, the inlet electric shut-off valve is opened, and the brine continues to flow into the collection well by gravity. If brine intake stops, the inlet electric shut-off valve is no longer opened, and the process ends.

10. The method for gravity-fed pneumatic water diversion in a salt lake according to claim 9, characterized in that: In step S3, when water is introduced into the water storage well, air is vented through the air supply pipe to ensure that the air inside the water storage well is at normal pressure.

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