A reverse osmosis lithium bromide solution regeneration and purification device

Abstract

The utility model discloses a kind of reverse osmosis lithium bromide solution regeneration purification device, including reverse osmosis membrane, the one end of reverse osmosis membrane is provided with liquid inlet pipe, the other end of reverse osmosis membrane is provided with regeneration liquid outlet pipe, the bottom of reverse osmosis membrane is provided with pure water outlet pipe in the side close to regeneration liquid outlet pipe, filter is provided on liquid inlet pipe, high-pressure solution pump is provided on liquid inlet pipe between filter and reverse osmosis membrane, regeneration liquid outlet pipe is provided with regeneration liquid on-line densimeter.The utility model drives lithium bromide solution through reverse osmosis membrane by high-pressure solution pump, effectively removes impurities in combination with filter, both regenerate and purify lithium bromide solution and protect membrane component, prolong service life.Pure water on-line densimeter and regeneration liquid on-line densimeter real-time feedback solution state, operating personnel can adjust device operating parameter in time according to monitoring data, realize accurate control to low concentration lithium bromide solution regeneration process, ensure that regeneration effect meets requirements.

Description

Technical Field

[0001] This utility model relates to a reverse osmosis lithium bromide solution regeneration and purification device. Background Technology

[0002] The concentration of the solution used in lithium bromide absorption chillers is typically maintained between 45% and 55%, and this concentration range is crucial to ensuring the normal cooling effect of the unit. When the solution concentration decreases, the cooling capacity of the unit will drop significantly. The core reason for solution dilution is that if the heat exchange tubes of the absorber, condenser, and evaporator are damaged during unit operation, water will seep into the unit, increasing the water content of the lithium bromide solution and diluting its concentration, thus affecting the overall cooling performance.

[0003] When a large amount of water enters a lithium bromide solution, there are two main traditional treatment methods: one is to return the solution to the plant for regeneration; the other is to use steam heating on-site to separate the water from the solution. However, both methods have obvious drawbacks—the regeneration process at the plant is cumbersome and time-consuming, affecting the continuous operation of the unit; the on-site steam heating method is prone to water vapor entrainment of lithium bromide solution when the solution concentration is too dilute, resulting in a large loss of solute, which wastes resources and increases costs. Utility Model Content

[0004] The main objective of this invention is to provide a reverse osmosis lithium bromide solution regeneration and purification device to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved by adopting the following technical solution: A reverse osmosis lithium bromide solution regeneration and purification device includes a reverse osmosis membrane, an inlet pipe at one end of the reverse osmosis membrane, a regenerated liquid outlet pipe at the other end of the reverse osmosis membrane, a pure water outlet pipe at the bottom of the reverse osmosis membrane, a filter on the inlet pipe, a high-pressure solution pump on the inlet pipe between the filter and the reverse osmosis membrane, and an online density meter for the regenerated liquid on the regenerated liquid outlet pipe.

[0006] Preferably, an electric valve for inlet is provided on the inlet pipe between the high-pressure solution pump and the reverse osmosis membrane, an electric valve for regenerated liquid outlet is provided on the regenerated liquid outlet pipe, and an electric valve for pure water outlet is provided on the pure water outlet pipe.

[0007] Preferably, the outlet section of the pure water outlet pipe is connected to a pure water tank, and the pure water tank is equipped with an online pure water density meter.

[0008] Preferably, the bottom of the pure water tank is provided with a backwash main pipe, the end of which is connected to the regenerated liquid outlet of the reverse osmosis membrane, and the inlet of the reverse osmosis membrane is provided with a first drain pipe.

[0009] Preferably, a first backwash valve is provided at one end of the backwash main pipe near the pure water tank, a backwash pump is provided on the backwash main pipe outside the first backwash valve, a second backwash valve is provided at the end of the backwash main pipe, and a first drain valve is provided on the first drain pipe.

[0010] Preferably, the backwash main pipe is provided with a backwash branch pipe, which is located above the backwash pump. The end of the backwash branch pipe is connected to the end of the pure water outlet side of the reverse osmosis membrane, and the first end of the pure water outlet side of the reverse osmosis membrane is provided with a second drain pipe.

[0011] Preferably, a third backwash valve is provided on the backwash branch pipe, and a second drain valve is provided on the second drain pipe.

[0012] Preferably, a first pressure gauge and a second pressure gauge are respectively installed at both ends of the filter on the inlet pipe, a third pressure gauge is installed on the inlet side of the reverse osmosis membrane, and a fourth pressure gauge is installed on the regenerated liquid outlet side of the reverse osmosis membrane. Preferably, a nitrogen purge pipe is connected to the liquid inlet pipe, a nitrogen cylinder is connected to the nitrogen purge pipe, and an electric nitrogen valve and a manual nitrogen valve are provided on the nitrogen purge pipe.

[0013] The beneficial technical effects of this utility model are as follows: 1. This invention uses a high-pressure solution pump to drive a lithium bromide solution through a reverse osmosis membrane, combined with a filter to effectively remove impurities. This process both regenerates and purifies the lithium bromide solution and protects the membrane components, extending their service life. Online densitometers for pure water and regenerated solution provide real-time feedback on the solution status. Operators can adjust the device's operating parameters promptly based on the monitoring data, achieving precise control over the regeneration process of low-concentration lithium bromide solution and ensuring that the regeneration effect meets requirements.

[0014] 2. This utility model uses a backwashing system in conjunction with pure water to backwash, promptly removing contaminants from the membrane surface, maintaining membrane flux and separation performance, significantly extending the service life of the reverse osmosis membrane, and reducing equipment operating costs and maintenance frequency.

[0015] 3. This utility model sets up multiple pressure gauges to monitor the pressure of key parts of the device in real time, which makes it easier for operators to find and solve problems in a timely manner; and when the device is shut down, nitrogen gas is introduced to prevent oxidation of internal components and contamination of the solution, ensuring that the device can operate stably under different working conditions and improving the reliability and stability of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a regeneration and purification device according to an embodiment of the present invention.

[0017] In the diagram: 1. Reverse osmosis membrane; 2. Inlet pipe; 3. Regenerated liquid outlet pipe; 4. Pure water outlet pipe; 5. Filter; 6. High-pressure solution pump; 7. Online regenerated liquid density meter; 8. Inlet electric valve; 9. Regenerated liquid outlet electric valve; 10. Pure water outlet electric valve; 11. Pure water tank; 12. Online pure water density meter; 13. Backwash main pipe; 14. First drain pipe; 15. First backwash valve; 16. Backwash pump; 17. Second backwash valve; 18. First drain valve; 19. Backwash branch pipe; 20. Second drain pipe; 21. Third backwash valve; 22. Second drain valve; 23. First pressure gauge; 24. Second pressure gauge; 25. Third pressure gauge; 26. Fourth pressure gauge; 27. Nitrogen purging pipe; 28. Nitrogen cylinder; 29. ​​Nitrogen electric valve; 30. Nitrogen manual valve. Detailed Implementation

[0018] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0019] like Figure 1 As shown, the reverse osmosis lithium bromide solution regeneration and purification device provided in this embodiment includes a reverse osmosis membrane 1, an inlet pipe 2 at one end of the reverse osmosis membrane 1, a regenerated liquid outlet pipe 3 at the other end of the reverse osmosis membrane 1, a pure water outlet pipe 4 at the bottom of the reverse osmosis membrane 1 near the regenerated liquid outlet pipe 3, a filter 5 on the inlet pipe 2, a high-pressure solution pump 6 between the filter 5 and the reverse osmosis membrane 1 on the inlet pipe 2, and an online regenerated liquid density meter 7 on the regenerated liquid outlet pipe 3.

[0020] In operation, the inlet electric valve 8 is opened, allowing a low-concentration lithium bromide solution to enter through the inlet pipe 2. After impurities are removed by the filter 5, the solution is pressurized and pumped to the reverse osmosis membrane 1 by the high-pressure solution pump 6. Under high pressure, the solvent in the solution permeates through the reverse osmosis membrane 1, forming permeate which is discharged from the pure water outlet pipe 4. The solute is retained, forming concentrated regenerated solution which is discharged from the regenerated solution outlet pipe 3. The density of the regenerated solution is monitored in real time by the online regenerated solution density meter 7.

[0021] Filter 5 removes particulate matter and impurities from low-concentration lithium bromide solutions, purifies the lithium bromide solution, and prevents it from clogging or scratching the surface of reverse osmosis membrane 1, thus extending the membrane's service life.

[0022] The online density meter 7 for regenerated liquid can monitor the density of the regenerated liquid in real time, thereby reflecting the concentration of the regenerated liquid. This allows operators to understand the regeneration status in a timely manner and transmits the data to the control system. The control system adjusts the opening of the inlet electric valve 8 according to the preset density range to control the inlet volume, thereby ensuring a stable regenerated liquid concentration.

[0023] In this embodiment, as Figure 1 As shown, an electric valve 8 is installed on the inlet pipe 2 between the high-pressure solution pump 6 and the reverse osmosis membrane 1, an electric valve 9 is installed on the regenerated liquid outlet pipe 3, and an electric valve 10 is installed on the pure water outlet pipe 4 to achieve automated control.

[0024] In this embodiment, as Figure 1 As shown, the outlet section of the pure water outlet pipe 4 is connected to the pure water tank 11. The pure water tank 11 is equipped with an online pure water density meter 12 to monitor the density of the pure water in the pure water tank 11 in real time and determine the purity of the pure water.

[0025] In this embodiment, as Figure 1 As shown, a backwash main pipe 13 is provided at the bottom of the pure water tank 11. The end of the backwash main pipe 13 is connected to the regenerated liquid outlet of the reverse osmosis membrane 1. A first drain pipe 14 is provided at the inlet of the reverse osmosis membrane 1. A first backwash valve 15 is provided at the end of the backwash main pipe 13 near the pure water tank 11. A backwash pump 16 is provided on the backwash main pipe 13 outside the first backwash valve 15. A second backwash valve 17 is provided at the end of the backwash main pipe 13. A first drain valve 18 is provided on the first drain pipe 14. When the device needs to be repaired or shut down, the second backwash valve 17 and the first drain valve 18 are opened to allow pure water to enter from the backwash main pipe 13 to flush the reverse osmosis membrane 1. After flushing, the water is discharged from the first drain pipe 14.

[0026] In this embodiment, as Figure 1 As shown, a backwash branch pipe 19 is installed on the backwash main pipe 13. The backwash branch pipe 19 is located above the backwash pump 16. The end of the backwash branch pipe 19 is connected to the end of the pure water outlet side of the reverse osmosis membrane 1. A second drain pipe 20 is installed at the beginning of the pure water outlet side of the reverse osmosis membrane 1. A third backwash valve 21 is installed on the backwash branch pipe 19, and a second drain valve 22 is installed on the second drain pipe 20. After the reverse osmosis membrane 1 has been running for a period of time, a certain amount of pollutants will be adsorbed on the membrane surface, resulting in a decrease in membrane flux and a deterioration in separation performance. At this time, the third backwash valve 21 and the second drain valve 22 are opened to allow pure water to enter from the backwash branch pipe 19 to flush the reverse osmosis membrane 1. After flushing, the water is discharged from the second drain pipe 20, reducing the corrosion of the external cavity of the reverse osmosis membrane 1 by the solution and backwashing the crystals or blockages in the reverse osmosis membrane 1 to extend the membrane's service life.

[0027] In this embodiment, as Figure 1As shown, a first pressure gauge 23 and a second pressure gauge 24 are respectively installed on both ends of the filter 5 on the inlet pipe 2 to monitor the pressure of the initial solution and the filtered solution. By comparing the pressure values ​​of the first pressure gauge 23 and the second pressure gauge 24, it can be determined whether there is any abnormality such as blockage in the filter 5. A third pressure gauge 25 is installed on the inlet side of the reverse osmosis membrane 1 to monitor the pressure of the solution entering the reverse osmosis membrane 1, ensuring that the pressure entering the membrane is within a suitable range and ensuring the normal operation of the reverse osmosis process. A fourth pressure gauge 26 is installed on the regenerated liquid outlet side of the reverse osmosis membrane 1 to monitor the pressure on the regenerated liquid side, helping operators to grasp the operating status of the regenerated liquid side and promptly detect potential problems such as membrane blockage.

[0028] In this embodiment, as Figure 1 As shown, a nitrogen purge pipe 27 is connected to the liquid inlet pipe 2, and a nitrogen cylinder 28 is connected to the nitrogen purge pipe 27. The nitrogen purge pipe 27 is equipped with a nitrogen electric valve 29 and a nitrogen manual valve 30. Nitrogen gas is introduced into the internal piping and related components of the device to purge air, creating a nitrogen protective atmosphere. This prevents oxidation and corrosion of the internal metal components from contact with air, and also avoids reactions between the solution and moisture or oxygen in the air, which could affect the solution quality. In special circumstances, the nitrogen release can be manually controlled using the nitrogen manual valve 30, increasing operational flexibility.

[0029] The specific workflow is as follows: During regeneration and purification: The low-concentration lithium bromide solution to be regenerated enters the device through the inlet pipe 2. At this time, the inlet electric valve 8 is in the open state, and the low-concentration lithium bromide solution first flows into the filter 5. In the filter 5, particulate impurities, suspended solids, etc. in the low-concentration lithium bromide solution are filtered and intercepted, and the solution after preliminary filtration flows out from the outlet of the filter 5.

[0030] Next, the filtered low-concentration lithium bromide solution enters the high-pressure solution pump 6. The high-pressure solution pump 6 starts, pressurizing the solution to a suitable pressure value, allowing the solution to pass through the connecting pipeline at a stable flow rate and pressure, and enter the reverse osmosis membrane 1. At the reverse osmosis membrane 1, according to the principle of reverse osmosis, small molecules such as water molecules pass through the reverse osmosis membrane 1 to form pure water, while lithium bromide and most impurities are retained, forming the regenerated solution that continues to flow.

[0031] Pure water flows into the pure water tank 11 for storage through the pure water outlet pipe 4 of the reverse osmosis membrane 1, when the pure water outlet electric valve 10 is in the open state. The operator can monitor the density of the pure water in the pure water tank 11 in real time through the pure water online density meter 12 on the pure water tank 11 to determine the purity of the pure water.

[0032] The regenerated solution, formed from the retained lithium bromide and impurities, continues to flow along the pipeline to the regenerated solution outlet side of the reverse osmosis membrane 1. Here, the online density meter 7 monitors the density of the regenerated solution in real time. Based on this density data, combined with the preset parameters and operating requirements of the device, the operator judges the regeneration effect of the solution. If the regeneration effect does not meet expectations, the pressure, flow rate, and other operating parameters of the high-pressure solution pump 6 can be adjusted, or other inspection and maintenance operations can be performed on the device to ensure that the regenerated solution meets the usage requirements. The regenerated solution is discharged through the regenerated solution outlet electric valve 9, facilitating subsequent treatment or reuse of the regenerated solution.

[0033] During backwashing: When the reverse osmosis membrane 1 needs backwashing maintenance after operating for a period of time, the operator can start the backwashing procedure. First, close the inlet electric valve 8, the regenerated liquid outlet electric valve 9, and the pure water outlet electric valve 10 to stop the inflow and outflow of solution. Then, open the first backwash valve 15 and start the backwash pump 16.

[0034] When the readings of the third pressure gauge 25 and the fourth pressure gauge 26 are abnormal, it indicates that the reverse osmosis membrane 1 is blocked. Open the third backwash valve 21 and the second drain valve 22 to allow pure water to enter from the backwash branch pipe 19 to flush the reverse osmosis membrane 1. After flushing, the water is discharged from the second drain pipe 20 to reduce the corrosion of the external cavity of the reverse osmosis membrane 1 by the solution. Backwashing the crystals or blockages in the reverse osmosis membrane 1 extends the service life of the membrane.

[0035] When the device needs to be inspected or shut down, open the second backwash valve 17 and the first drain valve 18 to allow pure water to enter from the backwash main pipe 13 to flush the reverse osmosis membrane 1. After flushing, the water is discharged from the first drain pipe 14 to flush out the residual solution. Then, nitrogen gas is used for protection.

[0036] When the equipment needs to be shut down for maintenance or is not in operation for an extended period of time: Open the nitrogen manual valve 30 and nitrogen electric valve 29 on the nitrogen cylinder 28 to fill the internal pipelines and related components of the device with nitrogen from the nitrogen cylinder 28, and expel the air to form a nitrogen protective atmosphere. This prevents the internal metal components of the device from oxidizing and corroding when in contact with air, and at the same time avoids the solution from reacting with moisture, oxygen and other substances in the air, which would affect the quality of the solution.

[0037] In summary, in this embodiment, the lithium bromide solution is driven by the high-pressure solution pump 6 through the reverse osmosis membrane 1, and impurities are effectively removed by the filter 5. This process both regenerates and purifies the lithium bromide solution and protects the membrane components, extending their service life. The online density meter 12 for pure water and the online density meter 7 for regenerated solution provide real-time feedback on the solution status. Operators can adjust the device operating parameters promptly based on the monitoring data, achieving precise control over the regeneration process of the low-concentration lithium bromide solution and ensuring that the regeneration effect meets requirements.

[0038] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A reverse osmosis lithium bromide solution regeneration and purification device, characterized in that: The device includes a reverse osmosis membrane (1), one end of which is provided with an inlet pipe (2), the other end of which is provided with a regenerated liquid outlet pipe (3), the bottom of which is provided with a pure water outlet pipe (4), a filter (5) is provided on the inlet pipe (2), a high-pressure solution pump (6) is provided between the filter (5) and the reverse osmosis membrane (1) on the inlet pipe (2), and an online regenerated liquid density meter (7) is provided on the regenerated liquid outlet pipe (3).

2. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 1, characterized in that: An electric valve (8) is installed on the inlet pipe (2) between the high-pressure solution pump (6) and the reverse osmosis membrane (1), an electric valve (9) is installed on the regenerated liquid outlet pipe (3), and an electric valve (10) is installed on the pure water outlet pipe (4).

3. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 1, characterized in that: The outlet section of the pure water outlet pipe (4) is connected to the pure water tank (11), and the pure water tank (11) is equipped with an online pure water density meter (12).

4. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 3, characterized in that: The bottom of the pure water tank (11) is provided with a backwash main pipe (13), the end of which is connected to the regenerated liquid outlet of the reverse osmosis membrane (1), and the inlet of the reverse osmosis membrane (1) is provided with a first drain pipe (14).

5. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 4, characterized in that: A first backwash valve (15) is provided at one end of the backwash main pipe (13) near the pure water tank (11). A backwash pump (16) is provided on the backwash main pipe (13) outside the first backwash valve (15). A second backwash valve (17) is provided at the end of the backwash main pipe (13). A first drain valve (18) is provided on the first drain pipe (14).

6. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 4, characterized in that: The backwash main pipe (13) is provided with a backwash branch pipe (19), which is located above the backwash pump (16). The end of the backwash branch pipe (19) is connected to the end of the pure water outlet side of the reverse osmosis membrane (1), and the first end of the pure water outlet side of the reverse osmosis membrane (1) is provided with a second drain pipe (20).

7. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 6, characterized in that: A third backwash valve (21) is provided on the backwash branch pipe (19), and a second drain valve (22) is provided on the second drain pipe (20).

8. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 1, characterized in that: The inlet pipe (2) is equipped with a first pressure gauge (23) and a second pressure gauge (24) at both ends of the filter (5), the inlet side of the reverse osmosis membrane (1) is equipped with a third pressure gauge (25), and the outlet side of the regenerated liquid of the reverse osmosis membrane (1) is equipped with a fourth pressure gauge (26).

9. The reverse osmosis lithium bromide solution regeneration and purification device according to claim 1, characterized in that: The inlet pipe (2) is connected to a nitrogen purge pipe (27), the nitrogen purge pipe (27) is connected to a nitrogen cylinder (28), and the nitrogen purge pipe (27) is equipped with a nitrogen electric valve (29) and a nitrogen manual valve (30).

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