Sea water desalination finished product water cleaning and recycling device

Abstract

The invention discloses a sea water desalination finished product water cleaning and recycling device, and relates to the technical field of sea water desalination, the sea water desalination finished product water cleaning and recycling device comprises a plurality of desalination mechanisms, the desalination mechanisms are in butt joint with one another, and water inlet pipes are arranged at the tops of the desalination mechanisms and used for conveying saline water into the desalination mechanisms; the desalination mechanism is used for performing low-temperature multi-effect evaporation on saline water to form distilled water, a cleaning and recycling mechanism is arranged at the bottom of the desalination mechanism, and the cleaning and recycling mechanism uses the distilled water in the desalination mechanism to clean the desalination mechanism when the desalination mechanism is shut down; distilled water in the desalination mechanism is used for cleaning the desalination mechanism through the cleaning and recycling mechanism, specifically, finished product water in the desalination mechanism is kept at a high liquid level, does not need to be discharged and serves as cleaning water for standby application, then saline water in the desalination mechanism is emptied, and the finished product water at the high liquid level is used for cleaning the desalination mechanism; therefore, the seawater desalination maintenance and cleaning cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination, and in particular to a device for cleaning and recycling seawater desalination product water. Background Art

[0002] The seawater system and product water system of the low-temperature, multi-effect distillation desalination equipment are isolated. The brine system flows step by step by gravity to the final brine effect side, where it is pumped out by the brine pump. The product water system also flows step by step by gravity to the final distilled water effect side, where it is pumped out by the product water pump. After the equipment is shut down, the seawater system needs to be cleaned, and the product water is directly discharged after the system is shut down. However, the brine system in the low-temperature, multi-effect distillation desalination equipment also requires cleaning and maintenance. This requires additional fresh water to clean the brine system, which increases fresh water usage and the maintenance and cleaning costs of the seawater desalination system. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a seawater desalination product water cleaning and reuse device to solve the problem in the prior art that the brine system in the warm multi-effect distillation seawater desalination equipment still needs to be cleaned and maintained, and additional fresh water is needed to clean the brine system in the low-temperature multi-effect distillation seawater desalination equipment, which increases the use of fresh water and leads to higher costs for seawater desalination maintenance and cleaning.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] Specifically, a device for cleaning and recycling finished water from seawater desalination is provided, which includes a plurality of desalination mechanisms, which are connected to each other. A water inlet pipe is provided at the top of the desalination mechanism, which is used to transport brine to the desalination mechanism. The desalination mechanism is used to evaporate the brine into distilled water through low-temperature multi-effect evaporation. A cleaning and recycling mechanism is provided at the bottom of the desalination mechanism. The cleaning and recycling mechanism uses the distilled water in the desalination mechanism to clean the desalination mechanism when the desalination mechanism is shut down.

[0006] As a further solution of the present invention: the desalination mechanism includes a desalination tank body, one end of the desalination tank body is connected to a first docking end cover, the other end of the desalination tank body is connected to a second docking end cover, the bottom surface of the desalination tank body is fixedly connected to a brine discharge pipe, the bottom surface of the second docking end cover is fixedly connected to a finished water discharge pipe, and a heat exchanger is arranged on the inside of the desalination tank body.

[0007] As a further solution of the present invention: the heat exchanger includes two fixed plates, and a plurality of heat exchange tubes are fixedly connected to the middle position between the two fixed plates.

[0008] As a further solution of the present invention, a guide tube is fixedly connected to the bottom position between the two fixed plates.

[0009] As a further solution of the present invention: a cylindrical hole is provided at the top of the fixing plate close to the second docking end cover.

[0010] As a further solution of the present invention: the cleaning and reuse mechanism includes a brine docking pipe and a finished water docking pipe, the brine docking pipe is connected to the brine discharge pipe, the finished water docking pipe is connected to the finished water discharge pipe, the middle of the brine docking pipe is connected to a brine branch pipe, and the end of the brine branch pipe is provided with a first branch valve.

[0011] As a further solution of the present invention: the bottom end of the brine docking pipe is connected to a brine pump, the bottom surface of the brine pump is connected to a first motor, and the output end of the brine pump is connected to a brine discharge valve.

[0012] As a further solution of the present invention: the bottom end of the finished water docking pipeline is connected to a distilled water pump, the bottom surface of the distilled water pump is connected to a second motor, and the output end of the distilled water pump is connected to a main control valve.

[0013] As a further solution of the present invention: the end of the main control valve away from the distilled water pump is connected to a forked pipe, the end of the forked pipe is provided with a finished water discharge valve and a finished water recovery valve, and a distilled water branch is provided between the forked pipe and the finished water discharge valve.

[0014] As a further solution of the present invention: a second branch valve is provided in the middle of the distilled water branch, and a recycling pipeline is provided between the distilled water branch and the brine branch.

[0015] Beneficial effects of the present invention:

[0016] When the seawater desalination operation is performed through the seawater desalination product water cleaning and reuse device, pretreated seawater is provided to the desalination mechanism through the water inlet pipe. After the seawater enters the desalination mechanism, it will evaporate in the desalination mechanism to form steam. Usually, multiple desalination mechanisms are connected in series, so that the steam formed in the first desalination mechanism will enter the second desalination mechanism and exchange heat with the seawater in the second desalination mechanism to form distilled mist from the seawater in the second desalination mechanism. This process is repeated in multiple desalination mechanisms. The desalination mechanisms are usually set to three to five. The specific number of desalination mechanisms connected in series is adaptively selected by technical personnel in this field according to the specifications of the desalination mechanism. When the desalination mechanism stops working, the distilled water in the desalination mechanism is used to clean the desalination mechanism through the cleaning and reuse mechanism. Specifically, the high liquid level of the finished water in the desalination mechanism is maintained and not discharged, and is used as cleaning water for standby. Then, after the brine in the desalination mechanism is drained, the desalination mechanism is cleaned with the high liquid level finished water, thereby reducing the maintenance and cleaning costs of seawater desalination. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 This is a schematic structural diagram of a device for cleaning and recycling seawater desalination product water according to the present invention;

[0019] Figure 2 This is a front view of the device for cleaning and recycling seawater desalination product water of the present invention;

[0020] Figure 3 This is a schematic diagram of the back structure of the device for washing and recycling seawater desalination product water of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the desalination mechanism in the present invention;

[0022] Figure 5 It is a schematic diagram of the internal structure of the guide end cover in the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the desalination mechanism in the present invention;

[0024] Figure 7 It is a structural schematic diagram of the desalination tank in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the heat exchanger in the present invention;

[0026] Figure 9 It is a structural diagram of the cleaning and recycling mechanism of the present invention;

[0027] Figure 10 It is a schematic diagram of the back structure of the cleaning and recycling mechanism in the present invention.

[0028] Explanation of the accompanying symbols: 1. Desalination mechanism; 11. Desalination tank; 12. First docking end cover; 13. Second docking end cover; 14. Brine discharge pipe; 15. Finished water discharge pipe; 16. Heat exchanger; 161. Fixing plate; 162. Heat exchange tube; 163. Cylindrical hole; 164. Guide pipe; 17. Guide end cover; 2. Water inlet pipe; 21. Brine nozzle; 3. Cleaning and reuse mechanism; 31. Brine docking pipe; 32. Finished water docking pipe; 33. Brine pump; 331. First motor; 34. Distilled water pump; 341. Second motor; 35. Brine discharge valve; 36. Main control valve; 37. Branch pipe; 38. Finished water discharge valve; 39. Finished water recovery valve; 310. Brine branch pipe; 311. Distilled water branch pipe; 312. Recycling pipe; 313. First branch pipe valve; 314. Second branch pipe valve. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figures 1-10 As shown, the present invention discloses a device for cleaning and recycling finished water from seawater desalination, including a desalination mechanism 1, which is in multiple numbers and is connected to each other. A water inlet pipe 2 is provided at the top of the desalination mechanism 1, and the water inlet pipe 2 is used to transport brine to the desalination mechanism 1. The desalination mechanism 1 is used to evaporate the brine at low temperature and multi-effect to form distilled water. A cleaning and recycling mechanism 3 is provided at the bottom of the desalination mechanism 1. The cleaning and recycling mechanism 3 uses the distilled water in the desalination mechanism 1 to clean the desalination mechanism 1 when the desalination mechanism 1 is shut down. It should be noted that when the seawater desalination operation is performed through the device for cleaning and recycling finished water from seawater desalination, pretreated seawater is provided to the desalination mechanism 1 through the water inlet pipe 2. After the seawater enters the desalination mechanism 1, it will evaporate in the desalination mechanism 1 to form steam. Usually, multiple desalination mechanisms 1 are connected in series. In this way, the steam formed in the first desalination mechanism 1 will enter the second desalination mechanism 1, exchange heat with the seawater in the second desalination mechanism 1, and form distilled mist from the seawater in the second desalination mechanism 1. This process is repeated in multiple desalination mechanisms 1. The desalination mechanism 1 is usually set to three to five. The specific number of desalination mechanisms 1 connected in series is adaptively selected by technical personnel in this field according to the specifications of the desalination mechanism 1. When the desalination mechanism 1 stops working, the distilled water in the desalination mechanism 1 is used to clean the desalination mechanism 1 through the cleaning and reuse mechanism 3. Specifically, the high liquid level of the finished water in the desalination mechanism 1 is maintained and not discharged. It is used as a standby for cleaning water. Then, after the brine in the desalination mechanism 1 is drained, the desalination mechanism 1 is cleaned with the high liquid level finished water, thereby reducing the maintenance and cleaning costs of seawater desalination.

[0032] Example 2

[0033] like Figures 1-8As shown, the desalination mechanism 1 includes a desalination tank body 11, one end of the desalination tank body 11 is connected to a first docking end cover 12, the other end of the desalination tank body 11 is connected to a second docking end cover 13, the bottom surface of the desalination tank body 11 is fixedly connected to a brine discharge pipe 14, the bottom surface of the second docking end cover 13 is fixedly connected to a finished water discharge pipe 15, and a heat exchanger 16 is provided on the inner side of the desalination tank body 11. It should be noted that the first docking end cover 12 is used to provide high-temperature steam to the heat exchanger 16 inside the desalination tank body 11, so that the interior of the heat exchanger 16 will be filled with high-temperature steam, and the bottom end of the water inlet pipe 2 is fixedly connected to a brine nozzle 21, which is arranged on the top of the heat exchanger 16. When the water inlet When the pipe 2 inputs brine into the interior of the desalination tank 11, the brine nozzle 21 will evenly spray the brine on the heat exchanger 16. In this way, after the brine contacts the heat exchanger 16, it will exchange heat with the high-temperature steam inside the heat exchanger 16, causing the brine to evaporate and form steam. The steam will enter the first docking end cover 12 corresponding to another desalination tank 11 through the second docking end cover 13, so that the steam can be recycled between multiple desalination tanks 11, thereby improving energy utilization. The evaporated and concentrated brine will flow down the heat exchanger 16 and be discharged through the brine discharge pipe 14, and the finished water formed after condensation of the steam in the heat exchanger 16 will be discharged through the finished water discharge pipe 15, thereby realizing the desalination of the brine.

[0034] The heat exchanger 16 includes two fixed plates 161, and a plurality of heat exchange tubes 162 are fixedly connected to the middle position between the two fixed plates 161. It should be noted that the fixed plates 161 are respectively fixed to the ends of the desalination tank body 11, separating the inner cavity of the desalination tank body 11 from the inner cavities of the first docking end cover 12 and the second docking end cover 13. One end of the heat exchange tube 162 is connected to the inner cavity of the first docking end cover 12, and the other end of the heat exchange tube 162 is connected to the inner cavity of the second docking end cover 13. In this way, the steam in the inner cavity of the first docking end cover 12 can enter the second docking end cover 13 after passing through the heat exchange tube 162. On this side of the end cover 13, a guide end cover 17 is provided inside the second docking end cover 13 near the outlet of the heat exchange tube 162 for conducting steam and finished water. In the process of steam passing through the heat exchange tube 162, it can perform heat exchange operation with the brine outside the heat exchange tube 162, so that the brine outside the heat exchange tube 162 evaporates to form steam, and the concentrated brine falls from the heat exchange tube 162 under the action of gravity, and finally gathers at the bottom of the desalination tank 11. The heat exchange tube 162 is evenly distributed between the two fixed plates 161 and is made of metal, which improves the heat exchange effect of the heat exchange tube 162.

[0035] A guide tube 164 is fixedly connected to the bottom position between the two fixed plates 161 shown. It should be noted that one end of the guide tube 164 is connected to the inner cavity of the first docking end cover 12, and the other end of the guide tube 164 is connected to the inner cavity of the second docking end cover 13. In this way, after the steam in the first docking end cover 12 forms finished water, it can flow through the guide tube 164 to the guide end cover 17 inside the second docking end cover 13, and be collected by the guide end cover 17. It should be noted that the guide tube 164 is at the lowest position of the inner cavity of the first docking end cover 12, and the guide tube 164 as a whole can be tilted toward one end of the guide end cover 17, which helps the flow of finished water in the guide tube 164. Due to the principle of thermal expansion and contraction, the height of the heat exchange tube 162 is higher than the height of the guide tube 164. Therefore, high-temperature steam will enter the heat exchange tube 162, and low-temperature steam and finished water will enter the guide tube 164, so it will not affect the effect of the steam in the first docking end cover 12.

[0036] A cylindrical hole 163 is provided at the top of the fixing plate 161 near the second docking end cover 13. It should be noted that the steam evaporated in the condenser 162 will enter the inner cavity of the second docking end cover 13 through the cylindrical hole 163, and then be transported by the second docking end cover 13 to the first docking end cover 12 corresponding to the other desalination tank body 11.

[0037] Example 3

[0038] like Figures 1-10 As shown, the cleaning and reuse mechanism 3 includes a brine docking pipe 31 and a finished water docking pipe 32. The brine docking pipe 31 is connected to the brine discharge pipe 14, and the finished water docking pipe 32 is connected to the finished water discharge pipe 15. The middle part of the brine docking pipe 31 is connected to a brine branch pipe 310, and the end of the brine branch pipe 310 is provided with a first branch valve 313. It should be noted that since the brine docking pipe 31 is connected to the brine discharge pipe 14, the concentrated brine in the brine discharge pipe 14 can directly enter the brine docking pipe 31 and be discharged by the brine docking pipe 31, ensuring that the concentrated brine will not accumulate in the desalination tank 11. Since the finished water docking pipe 32 is connected to the finished water discharge pipe 15, the finished water in the finished water discharge pipe 15 can directly enter the finished water docking pipe 32, and the finished water is collected by the finished water docking pipe 32 for subsequent treatment.

[0039] The bottom end of the brine docking pipe 31 is connected to the brine pump 33, the bottom surface of the brine pump 33 is connected to the first motor 331, and the output end of the brine pump 33 is connected to the brine discharge valve 35. It should be noted that the brine docking pipe 31 can transport concentrated brine to the interior of the brine pump 33. An impeller is provided inside the brine pump 33, and the output shaft of the first motor 331 is directly fixedly connected to the impeller inside the brine pump 33. When in use, turn on the first motor 331, and the output shaft of the first motor 331 can directly drive the impeller to rotate at high speed. The high-speed rotating impeller can make the concentrated brine entering the brine pump 33 generate centrifugal force, and then be transported to the brine discharge valve 35 through the pipe, and finally discharged by the brine discharge valve 35.

[0040] The bottom end of the finished water docking pipe 32 is connected to a distilled water pump 34, the bottom surface of the distilled water pump 34 is connected to a second motor 341, and the output end of the distilled water pump 34 is connected to a main control valve 36. It should be noted that the finished water docking pipe 32 can directly transport the finished water to the interior of the distilled water pump 34. An impeller is provided inside the distilled water pump 34, and the output shaft of the second motor 341 is directly fixedly connected to the impeller inside the distilled water pump 34. When in use, turn on the second motor 341, and the output shaft of the second motor 341 can directly drive the impeller inside the distilled water pump 34 to rotate at high speed. The high-speed rotating impeller can make the finished water entering the distilled water pump 34 generate centrifugal force, and then be transported to the main control valve 36 through the pipeline, and then transported to the subsequent processing process by the main control valve 36.

[0041] The end of the main control valve 36 away from the distilled water pump 34 is connected to a forked pipe 37, and the end of the forked pipe 37 is provided with a finished water discharge valve 38 and a finished water recovery valve 39. A distilled water branch 311 is provided between the forked pipe 37 and the finished water discharge valve 38. It should be noted that in the process of collecting finished water, the finished water discharge valve 38 can be closed and the finished water recovery valve 39 can be opened. In this way, the main control valve 36 can transport the finished water to the finished water recovery valve 39 through the forked pipe 37, and the finished water recovery valve 39 collects the finished water. It should be noted that both the finished water discharge valve 38 and the finished water recovery valve 39 can use solenoid valves, which can be remotely controlled by technical personnel.

[0042] A second branch valve 314 is provided in the middle of the distilled water branch 311, and a recycling pipe 312 is provided between the distilled water branch 311 and the brine branch 310. It should be noted that when the desalination mechanism 1 stops running, the finished water discharge valve 38 and the finished water recovery valve 39 are first closed at the same time, so that the finished water accumulates on the inner side of the guide end cover 17 to form a high liquid level, and at the same time the concentrated brine in the desalination tank 11 is emptied through the brine discharge valve 35, and then the brine discharge valve 35 is closed, and the valve in the recycling pipe 312 and the second motor 341 are opened at the same time, so that the finished water can enter the recycling pipe 312. The brine docking pipe 31 is entered once to clean the concentrated brine pipeline on one side of the brine docking pipe 31, that is, the high-liquid-level finished water is used to clean the desalination mechanism 1, thereby reducing the maintenance and cleaning costs of seawater desalination. After the cleaning of the pipe points on one side of the brine docking pipe 31 is completed, the return pipe 312 is closed, and then the first motor 331 and the brine discharge valve 35 are opened to drain the cleaning water on one side of the brine docking pipe 31. This completes the cleaning of one side of the brine docking pipe 31 and drains the finished water on the side of the distilled water docking pipe 32, thereby ensuring the maintenance and cleaning of the desalination mechanism 1.

[0043] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A device for cleaning and recycling seawater desalination finished water, characterized in that: include: There are a plurality of desalination mechanisms (1), and the plurality of desalination mechanisms (1) are connected to each other; A water inlet pipe (2) is provided at the top of the desalination mechanism (1), and the water inlet pipe (2) is used to transport salt water into the desalination mechanism (1). The desalination mechanism (1) is used to evaporate the salt water at low temperature and multi-effect to form distilled water; The cleaning and recycling mechanism (3) is arranged at the bottom of the desalination mechanism (1). When the desalination mechanism (1) is shut down, the cleaning and recycling mechanism (3) uses the distilled water in the desalination mechanism (1) to clean the desalination mechanism (1).

2. The device for cleaning and recycling desalination product water according to claim 1, characterized in that: The desalination mechanism (1) comprises a desalination tank body (11), one end of the desalination tank body (11) is connected to a first docking end cover (12), the other end of the desalination tank body (11) is connected to a second docking end cover (13), the bottom surface of the desalination tank body (11) is fixedly connected to a brine discharge pipe (14), the bottom surface of the second docking end cover (13) is fixedly connected to a finished water discharge pipe (15), and a heat exchanger (16) is provided inside the desalination tank body (11).

3. The device for cleaning and recycling desalination product water according to claim 2, characterized in that: The heat exchanger (16) comprises two fixed plates (161), and a plurality of heat exchange tubes (162) are fixedly connected to the middle position between the two fixed plates (161).

4. The device for cleaning and recycling desalination product water according to claim 3, characterized in that: A guide tube (164) is fixedly connected to the bottom position between the two fixing plates (161).

5. The device for cleaning and recycling desalination product water according to claim 2, characterized in that: A cylindrical hole (163) is provided at the top of the fixing plate (161) close to the second docking end cover (13).

6. The device for cleaning and recycling desalination product water according to claim 1, characterized in that: The cleaning and recycling mechanism (3) comprises a brine docking pipe (31) and a finished water docking pipe (32); the brine docking pipe (31) is connected to a brine discharge pipe (14); the finished water docking pipe (32) is connected to a finished water discharge pipe (15); a brine branch pipe (310) is connected to the middle of the brine docking pipe (31), and a first branch valve (313) is provided at the end of the brine branch pipe (310).

7. The device for cleaning and recycling desalination product water according to claim 6, characterized in that: The bottom end of the brine docking pipe (31) is connected to a brine pump (33), the bottom surface of the brine pump (33) is connected to a first motor (331), and the output end of the brine pump (33) is connected to a brine discharge valve (35).

8. The device for cleaning and recycling desalination product water according to claim 6, characterized in that: The bottom end of the finished water connection pipe (32) is connected to a distilled water pump (34), the bottom surface of the distilled water pump (34) is connected to a second motor (341), and the output end of the distilled water pump (34) is connected to a main control valve (36).

9. The device for cleaning and recycling desalination product water according to claim 8, characterized in that: One end of the main control valve (36) away from the distilled water pump (34) is connected to a bifurcated pipe (37), the end of the bifurcated pipe (37) is provided with a finished water discharge valve (38) and a finished water recovery valve (39), and a distilled water branch (311) is provided between the bifurcated pipe (37) and the finished water discharge valve (38).

10. The device for cleaning and recycling desalination product water according to claim 9, characterized in that: A second branch valve (314) is provided in the middle of the distilled water branch (311), and a recycling pipeline (312) is provided between the distilled water branch (311) and the brine branch (310).

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