An on-line automatic maintenance cleaning system and method for a px energy recovery device

Abstract

The application discloses an online automatic maintenance cleaning system and method for PX energy recovery devices, which comprises a cleaning water tank and a booster pump; the outlet of the cleaning water tank is connected with the water outlet of the booster pump and the inlet of a second manual ball valve; the outlet of the second manual ball valve is divided into two branches, each of which is connected with the inlet of a manual ball valve; one branch of the outlet of the manual ball valve is connected with the low-pressure inlet of the PX energy recovery device, and the other branch is connected with the low-pressure raw seawater outlet of a seawater desalination system; the high-pressure outlet of the PX energy recovery device is connected with the booster pump and the high-pressure seawater outlet of the seawater desalination system; and the water outlet of the booster pump is connected with the inlet of a seventh manual ball valve, the cleaning water tank, the high-pressure outlet of the PX energy recovery device and the high-pressure concentrated seawater outlet of the seawater desalination system. The application is automatic cleaning, has controllability, high maintenance efficiency, small workload and the characteristics of reducing operation cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water treatment, and more particularly to an online automatic maintenance cleaning system and method for a PX energy recovery device. BACKGROUND

[0002] The PX energy recovery device is also called a positive displacement rotary energy recovery device, and is currently the energy recovery device with the highest recovery efficiency and the best working condition adaptability, and the efficiency can reach more than 98%. The PX energy recovery device is mainly applied to a seawater reverse osmosis system. The PX energy recovery device belongs to a structure-precise device, and in a long-term use process, internal components will appear to be scaled and sludge accumulated, which will cause the rotor speed of the PX energy recovery device to be reduced, and even a stop fault to occur. After the fault occurs, the internal rotor and the shell are generally checked and repaired through a manual disassembly of the PX energy recovery device, which has the disadvantages of hysteresis, low repair efficiency, large workload, and high operation cost, and seriously affects the long-term stable operation of the system. SUMMARY

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide an online automatic maintenance cleaning system and method for a PX energy recovery device, which can periodically perform online automatic maintenance cleaning on the PX energy recovery device in a normal operation process, clean the accumulated scaling and sludge in the PX energy recovery device in time, prevent problems from occurring, maintain the high-efficiency and stable operation of the PX energy recovery device for a long time, eliminate the faults of the rotor speed reduction and stop, and realize the continuous, safe and stable operation of the system. The online maintenance cleaning is automatic operation, has the characteristics of controllability, high repair efficiency, small workload and low operation cost, and has great economic benefits.

[0004] In order to achieve the above-mentioned purpose of the application, the technical scheme adopted by the present application is as follows:

[0005] An online automatic maintenance cleaning system for a PX energy recovery device, comprising a cleaning water tank, a booster pump, a first electric ball valve, a second manual ball valve, a seventh manual ball valve and a control system.

[0006] The outlet of the cleaning water tank is divided into two paths, one of which is connected with the inlet of the first electric ball valve, and the first electric ball valve is connected with the water outlet of the booster pump, and the other path is connected with the inlet of the second manual ball valve, and the outlet of the second manual ball valve is divided into two paths, each of which is connected with the inlet of a manual ball valve, and one path of the outlet of the manual ball valve is connected with the low-pressure inlet of each PX energy recovery device, and the other path is connected with the low-pressure seawater outlet of the seawater desalination system, and the high-pressure outlet of the PX energy recovery device is divided into two paths, one of which is connected with the booster pump, and the other path is connected with the high-pressure seawater outlet of the seawater desalination system.

[0007] The outlet of the booster pump is divided into four paths, one of which is connected with the inlet of the seventh manual ball valve, one of which is connected with the inlet of the cleaning water tank, the third of which is connected with the high-pressure inlet of the PX energy recovery device, and the high-pressure concentrated seawater outlet of the seawater desalination system is connected with the high-pressure inlet of the PX energy recovery device; the low-pressure outlet of the PX energy recovery device is divided into two paths, one of which is connected with the inlet of the cleaning water tank, and the other of which is connected with the low-pressure concentrated seawater outlet of the seawater desalination system;

[0008] The booster pump, the first electric ball valve and the control system are connected.

[0009] Further, a third manual ball valve, a second filter, a high-pressure plunger pump, a fourth manual ball valve and a second pressure gauge are arranged on the pipeline between the outlet of the cleaning water tank and the inlet of the first electric ball valve, and the high-pressure plunger pump is connected with the control system.

[0010] Further, a first manual ball valve, a first filter and a water supply pump are arranged between the other path of the outlet of the cleaning water tank and the second manual ball valve, and the water supply pump is connected with the control system.

[0011] Further, a flow meter and a first pressure gauge are arranged on the pipeline of the outlet of the second manual ball valve, and the flow meter is connected with the control system.

[0012] Further, one path of the high-pressure outlet of the PX energy recovery device is connected with the fifth manual ball valve and the booster pump through the twelfth manual ball valve, and the other path is connected with the high-pressure seawater outlet of the seawater desalination system through the eleventh manual ball valve, a pressure transmitter is arranged on the pipeline of the low-pressure outlet of the PX energy recovery device, and the pressure transmitter is connected with the control system.

[0013] Further, a third pressure gauge and a second electric ball valve are arranged on the pipeline between the twelfth manual ball valve and the fifth manual ball valve, and the second electric ball valve is connected with the control system.

[0014] Further, an eighth manual ball valve for emptying is arranged on the pipeline of the low-pressure outlet of the PX energy recovery device, and a twenty-fifth manual ball valve for emptying is arranged at the bottom of the cleaning water tank; a liquid level meter is arranged in the cleaning water tank, and the liquid level meter is connected with the control system.

[0015] Further, the water supply pump, the booster pump and the high-pressure plunger pump are variable frequency pumps.

[0016] A PX energy recovery device online automatic maintenance cleaning method of a system as described above, comprising the following steps:

[0017] First, exhaust, then turn on the water supply pump, determine the low-pressure water inflow according to the number of PX energy recovery devices in operation, and the water supply pump is automatically frequency-regulated and locked with the first flow meter, and runs at a constant flow.

[0018] After the first electric ball valve is out of the cleaning liquid, the booster pump and the second flowmeter are started in interlocking, the flow parameter is consistent with the low-pressure inlet flow of the feedwater pump outlet, and the system runs automatically with constant flow by frequency adjustment, and exhaust is performed;

[0019] Meanwhile, after the first electric ball valve is out of the cleaning liquid, the high-pressure plunger pump is started, the first electric ball valve is closed, the second electric ball valve is opened, and exhaust is completed.

[0020] The high-pressure plunger pump is raised to the set value, and after stable operation, the low-pressure inlet flow of the PX energy recovery device, the high-pressure outlet flow of the PX energy recovery device, the high-pressure inlet flow of the PX energy recovery device and the low-pressure outlet flow of the PX energy recovery device are kept consistent within the normal operation range, and the pressure in the low-pressure outlet pipeline of the PX energy recovery device is greater than the set pressure, so that the PX energy recovery device is cleaned.

[0021] Further, the set value is 40 Hz, and the set pressure is 0.12 MPa.

[0022] Compared with the prior art, the present application has the beneficial effects of:

[0023] The present application solves the problem of lagging faults of traditional PX energy recovery devices, and completely realizes autonomous controllability. After the rotor speed is reduced or stopped due to fouling and sludge accumulation of internal components of the PX energy recovery device, the reverse osmosis system also stops sequentially, and such non-stop events have randomness, uncertainty and no regularity, and the system may stop at any time. The use of the online cleaning system can completely prevent such accidents from occurring, and the system is controllable by humans.

[0024] The present application solves the problem of low maintenance efficiency and large workload of PX energy recovery devices. After the rotor speed is reduced or stopped due to fouling and sludge accumulation of internal components of the PX energy recovery device, the PX energy recovery device needs to be manually disassembled by professional after-sales personnel of the manufacturer, and then assembled after cleaning. The PX energy recovery device is heavy and has high precision, and the disassembly process is complex and time-consuming. In addition, the professional personnel may not be available on call. The online cleaning system is fully automatic PLC controlled, and only the regular operation of the maintenance personnel is required without the guidance of the manufacturer's after-sales personnel. The system has the characteristics of high maintenance efficiency and small workload.

[0025] The present application solves the problem of high operating cost of PX energy recovery devices. The use of the online cleaning system can completely prevent such accidents from occurring. First, the seawater desalination reverse osmosis system runs continuously and stably, and does not affect the normal production activities of the enterprise. Second, the system has high maintenance efficiency, small workload and does not require professional after-sales personnel to come to the factory, which saves most of the maintenance costs, reduces the operating cost and has great economic benefits.

[0026] The application can be constructed with water treatment project, and the one-time investment of matched equipment pipes, instruments, valves, control systems and the like is completed, and after subsequent debugging is completed, direct use is achieved, and any temporary measures do not need to be separately arranged, and rapid and convenient use is achieved.

[0027] According to the actual operation of the system, the PX energy recovery device is regularly maintained and cleaned online, the risk of rotor speed reduction or stop caused by fouling and sludge accumulation of internal components of the PX energy recovery device can be basically avoided, and the non-stop of the seawater desalination reverse osmosis system caused by the reasons can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The figure is a structural schematic diagram of the system of the application.

[0029] In the figure, 1 is a cleaning water tank, 2 is a first filter, 3 is a second filter, 4 is a feed pump, 5 is a booster pump, 6 is a high-pressure piston pump, 7 is a first flowmeter, 8 is a second flowmeter, 9 is a third flowmeter, 10 is a fourth flowmeter, 11 is a liquid level meter, 12 is a first pressure gauge, 13 is a second pressure gauge, 14 is a third pressure gauge, 15 is a fourth pressure gauge, 16 is a pressure transmitter, 17 is a first electric ball valve, 18 is a second electric ball valve, 19 is a first manual ball valve, 20 is a second manual ball valve, 21 is a third manual ball valve, 22 is a fourth manual ball valve, 23 is a fifth manual ball valve, 24 is a sixth manual ball valve, 25 is a seventh manual ball valve, 26 is an eighth manual ball valve, 27 is a ninth manual ball valve, 28 is a tenth manual ball valve, 29 is an eleventh manual ball valve, 30 is a twelfth manual ball valve, 31 is a thirteenth manual ball valve, 32 is a fourteenth manual ball valve, 33 is a fifteenth manual ball valve, 34 is a sixteenth manual ball valve, 35 is a seventeenth manual ball valve, 36 is an eighteenth manual ball valve, 37 is a nineteenth manual ball valve, 38 is a twentieth manual ball valve, 39 is a twenty-first manual ball valve, 40 is a twenty-second manual ball valve, 41 is a twenty-third manual ball valve, 42 is a twenty-fourth manual ball valve, 43 is a twenty-fifth manual ball valve, 44 is a manual diaphragm valve, 45 is a first PX energy recovery device, 46 is an Nth PX energy recovery device, and 47 is a control system. DETAILED DESCRIPTION

[0030] The application is described in detail below in combination with the drawings and specific exemplary embodiments. However, it should be understood that various modifications and variations can be made without departing from the scope of the application defined by the appended claims. The detailed description and drawings should be considered merely illustrative, and not restrictive, and if there are any such modifications and variations, they will all fall within the scope of the application described herein. In addition, the background is intended to illustrate the state of the art and significance of the technology, and is not intended to limit the application field of the application.

[0031] The system in the application is applied in a seawater desalination reverse osmosis system, is matched with the seawater reverse osmosis system, guarantees the stable operation of the seawater desalination reverse osmosis system, and can also be applied in other systems.

[0032] Referring to Figure 1 The application provides an online automatic maintenance cleaning system of a PX energy recovery device, which comprises a cleaning water tank 1, a first filter 2, a second filter 3, a water supply pump 4, a booster pump 5, a high-pressure plunger pump 6, a first flowmeter 7, a second flowmeter 8, a third flowmeter 9, a fourth flowmeter 10, a liquid level meter 11, a first pressure gauge 12, a second pressure gauge 13, a third pressure gauge 14, a fourth pressure gauge 15, a pressure transmitter 16, a first electric ball valve 17, a second electric ball valve 18, a first manual ball valve 19, a second manual ball valve 20, a third manual ball valve 21, a fourth manual ball valve 22, a fifth manual ball valve 23, a sixth manual ball valve 24, a seventh manual ball valve 25, an eighth manual ball valve 26, a ninth manual ball valve 27, a tenth manual ball valve 28, an eleventh manual ball valve 29, a twelfth manual ball valve 30, a thirteenth manual ball valve 31, a fourteenth manual ball valve 32, a fifteenth manual ball valve 33, a sixteenth manual ball valve 34, a seventeenth manual ball valve 35, an eighteenth manual ball valve 36, a nineteenth manual ball valve 37, a twentieth manual ball valve 38, a twenty-first manual ball valve 39, a twenty-second manual ball valve 40, a twenty-third manual ball valve 41, a twenty-fourth manual ball valve 42, a twenty-fifth manual ball valve 43, a manual diaphragm valve 44, a first PX energy recovery device 45, an Nth PX energy recovery device 46 and a control system 47.

[0033] The water tank 1 is provided with a liquid level gauge 11. The outlet of the water tank 1 is divided into two paths. One path is connected to the inlet of the first electric ball valve 17 through the third manual ball valve 21, the second filter 3, the high-pressure plunger pump 6, the fourth manual ball valve 22 and the second pressure gauge 13. The first electric ball valve 17 is connected to the outlet of the booster pump 5. The other path is connected to the inlet of the second manual ball valve 20 through the first manual ball valve 19, the first filter 2 and the water supply pump 4. The two paths constitute the PX energy recovery device water inlet main pipe. The PX energy recovery device is N in number, including the first PX energy recovery device 45 and the Nth PX energy recovery device 46. The outlet of the PX energy recovery device water inlet main pipe, i.e. the outlet of the second manual ball valve 20, is divided into two paths. One path is connected to the inlet of the tenth manual ball valve 28. The outlet of the tenth manual ball valve 28 is divided into two paths. One path is connected to the low-pressure inlet of the first PX energy recovery device 45. The other path is connected to the low-pressure seawater outlet of the original seawater desalination system through the ninth manual ball valve 27. The other path of the outlet of the PX energy recovery device water inlet main pipe is connected to the inlet of the eighteenth manual ball valve 36. The first flow meter 7 and the first pressure gauge 12 are arranged on the PX energy recovery device water inlet main pipe between the second manual ball valve 20 and the tenth manual ball valve 28. The high-pressure outlet of the first PX energy recovery device 45 is divided into two paths. One path is connected to the booster pump 5 through the twelfth manual ball valve 30, the fifth manual ball valve 23 and the fifth manual ball valve 23. The third pressure gauge 14 and the second flow meter 8 are arranged on the pipeline between the twelfth manual ball valve 30 and the fifth manual ball valve 23. The other path is connected to the high-pressure seawater outlet of the original seawater desalination system through the eleventh manual ball valve 29.

[0034] Similarly, the outlet of the eighteenth manual ball valve 36 is divided into two paths. One path is connected to the low-pressure inlet of the Nth PX energy recovery device 46. The other path is connected to the low-pressure seawater outlet of the original seawater desalination system through the seventeenth manual ball valve 35. The high-pressure outlet of the Nth PX energy recovery device 46 is divided into two paths. One path is connected to the inlet of the booster pump 5 through the twentieth manual ball valve 38, the fifth manual ball valve 23 and the fifth manual ball valve 23. The other path is connected to the high-pressure seawater outlet of the original seawater desalination system through the nineteenth manual ball valve 37.

[0035] The first PX energy recovery device 45 further comprises a high-pressure inlet and a low-pressure outlet. Specifically, the outlet of the booster pump 5 is divided into four paths, one of which is connected with the inlet of the seventh manual ball valve 25, one of which is connected with the inlet of the sixth manual ball valve 24, the third path is connected with the high-pressure inlet of the first PX energy recovery device 45 through the fourteenth manual ball valve 32, and the high-pressure concentrated seawater outlet of the original seawater desalination system is connected with the high-pressure inlet of the first PX energy recovery device 45 through the thirteenth manual ball valve 31. The low-pressure outlet of the first PX energy recovery device 45 is divided into two paths, one of which is connected with the inlet of the cleaning water tank 1 through the sixteenth manual ball valve 34 and the manual diaphragm valve 44, and the other of which is connected with the low-pressure concentrated seawater outlet of the original seawater desalination system through the fifteenth manual ball valve 33. The pressure transmitter 16 and the fourth flowmeter 10 are arranged on the pipeline between the sixteenth manual ball valve 34 and the manual diaphragm valve 44.

[0036] Similarly, the Nth PX energy recovery device 46 also comprises a high-pressure inlet and a low-pressure outlet. The fourth path of the outlet of the booster pump 5 is connected with the high-pressure inlet of the Nth PX energy recovery device 46 through the twenty-second manual ball valve 40, and the high-pressure concentrated seawater outlet of the original seawater desalination system is connected with the high-pressure inlet of the Nth PX energy recovery device 46 through the twenty-first manual ball valve 39. The low-pressure outlet of the Nth PX energy recovery device 46 is divided into two paths, one of which is connected with the inlet of the cleaning water tank 1 through the twenty-fourth manual ball valve 42 and the manual diaphragm valve 44, and the outlet of the manual diaphragm valve 44 is also connected with the eighth manual ball valve 26, and the other of which is connected with the low-pressure concentrated seawater outlet of the original seawater desalination system through the twenty-third manual ball valve 41.

[0037] The outlet of the sixth manual ball valve 24 is connected with the inlet of the cleaning water tank 1 through the second electric ball valve 18.

[0038] The seventh manual ball valve 25, the eighth manual ball valve 26, the twenty-fifth manual ball valve 43 at the bottom of the cleaning water tank 1 are connected with the drainage ditch in the workshop for emptying the system.

[0039] The water supply pump 4, the booster pump 5 and the high-pressure plunger pump 6 are controlled by frequency conversion, and the equipment parameters can meet the simultaneous cleaning of multiple or different types of PX energy recovery devices.

[0040] The water supply pump 4, the booster pump 5, the high-pressure plunger pump 6, the first flowmeter 7, the second flowmeter 8, the third flowmeter 9, the fourth flowmeter 10, the liquid level meter 11, the pressure transmitter 16, the first electric ball valve 17 and the second electric ball valve 18 are connected with the control system 47, and participate in system program control and monitoring.

[0041] The PX energy recovery device cleaning is divided into acid cleaning and alkali cleaning, and is sequentially performed in order. The cleaning process is the same. In the cleaning system, the initial setting of the control system 47 program control data and the preparation of the reagent need manual participation, and the cleaning process is fully automatic. The following is an example of manual control for the first use of the system.

[0042] According to the online automatic maintenance cleaning design parameters, the number N of the put-into-operation cleaning PX energy recovery device can be selected, which shall not exceed the cleaning system design capacity, and the first PX energy recovery device 45 is taken as an example in the embodiment.

[0043] After the pre-operation inspection is correct, all the equipment and valves are in the shutdown and closed state.

[0044] The pickling cleaning solution or the alkaline cleaning solution is prepared in the cleaning water tank 1.

[0045] The first manual ball valve 19, the second manual ball valve 20, the third manual ball valve 21, the fourth manual ball valve 22, the fifth manual ball valve 23, the tenth manual ball valve 28, the twelfth manual ball valve 30, the fourteenth manual ball valve 32 and the sixteenth manual ball valve 34 are opened.

[0046] The sixth manual ball valve 24 and the manual diaphragm valve 44 are opened to a reasonable opening degree, which is determined in the opening degree debugging process.

[0047] The first electric ball valve 17 is opened for automatic exhaust of the system.

[0048] The feed water pump 4 is started, the low-pressure water inlet flow is determined according to the number N of the put-into-operation PX energy recovery device, the feed water pump 3 is automatically frequency-regulated and is interlocked with the first flowmeter 7, and the automatic frequency-regulated constant flow operation is performed.

[0049] After the first electric ball valve 17 is opened for 60 seconds, the booster pump 5 is started and is interlocked with the second flowmeter 8, the flow parameter is consistent with the low-pressure water inlet flow of the feed water pump 4 outlet, the automatic frequency-regulated constant flow operation is performed, and the system continues to exhaust.

[0050] After the first electric ball valve 17 is opened for 60 seconds, the high-pressure plunger pump 6 is started, the high-pressure plunger pump 6 is mainly used to provide water production flow and PX lubrication flow, the high-pressure plunger pump 6 is opened for 60 seconds at 20 Hz, the first electric ball valve 17 is closed, the second electric ball valve 18 is opened, and the exhaust is completed.

[0051] The high-pressure plunger pump 6 continues to increase the frequency, slowly and intermittently increases the frequency to 40 Hz, and after the stable operation is observed, the sixth manual ball valve 24 and the manual diaphragm valve 44 are adjusted according to the fourth pressure gauge 15, the third flowmeter 9, the fourth flowmeter 10 and the pressure transmitter 16, the flow of the first flowmeter 7, the second flowmeter 8, the third flowmeter 9 and the fourth flowmeter 10 is ensured to be in the normal operation range and consistent according to the number N of the put-into-operation PX energy recovery device, and the value of the pressure transmitter 16 is greater than 0.12 MPa.

[0052] The rotor of the first PX energy recovery device 45 has rotated and operated, the performance slowly recovers, the cleaning solution returns to the cleaning water tank 1, and the circulation cleaning is performed for 1 hour, which can be set.

[0053] After the cycle cleaning time is completed, stop the high-pressure plunger pump 6, the booster pump 5, and the water supply pump 4 in sequence, close the second electric ball valve 18, and restore the system to its initial state.

[0054] Open the seventh manual ball valve 25, the eighth manual ball valve 26, and the twenty-fifth manual ball valve 43 at the bottom of the cleaning water tank 1 to drain the cleaning fluid from the system. Close the valves after the drainage is complete.

[0055] Prepare a fresh cleaning solution for the next cleaning cycle.

[0056] After all cleaning is completed, open the ninth manual ball valve 27, the eleventh manual ball valve 29, the thirteenth manual ball valve 31 and the fifteenth manual ball valve 33 according to the number N of PX energy recovery devices to be put into operation, and close the tenth manual ball valve 28, the twelfth manual ball valve 30, the fourteenth manual ball valve 32 and the sixteenth manual ball valve 34 to put the seawater desalination reverse osmosis system into operation.

[0057] If the pressure transmitter 16 reading is continuously less than 0.12 MPa for 200 seconds during the cleaning process, the system protection will stop.

[0058] During the cleaning process, if the level gauge 11 of the cleaning water tank 1 is lower than the protection stop level of the water supply pump 4 and the high-pressure plunger pump 6, the system will be shut down.

[0059] The working principle of the present invention has been described in detail above with reference to the accompanying drawings. However, those skilled in the art should understand that the description is only for interpreting the claims. The scope of protection of the present invention is not limited to the description. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An online automatic maintenance cleaning system for a PX energy recovery device, characterized in that, Includes a cleaning water tank (1), a booster pump (5), a first electric ball valve (17), a second manual ball valve (20), a seventh manual ball valve (25), and a control system (47); there are N PX energy recovery devices; Among them, the outlet of the cleaning water tank (1) is divided into two paths, one path is connected to the inlet of the first electric ball valve (17), the first electric ball valve (17) is connected to the outlet of the booster pump (5), and the other path is connected to the inlet of the second manual ball valve (20); the outlet of the second manual ball valve (20) is connected to the inlet of the tenth manual ball valve (28) and the other path is connected to the inlet of the eighteenth manual ball valve (36); the outlet of the tenth manual ball valve (28) is divided into two paths, one path is connected to the low-pressure inlet of the first PX energy recovery device (45), and the other path of the outlet of the tenth manual ball valve (28) is connected to the low-pressure seawater outlet of the original seawater desalination system; the outlet of the eighteenth manual ball valve (36) is divided into two paths, one path is connected to the low-pressure inlet of the Nth PX energy recovery device (46), and the other path is connected to the low-pressure seawater outlet of the original seawater desalination system; the high-pressure outlet of each PX energy recovery device is divided into two paths, one path is connected to the booster pump (5), and the other path is connected to the high-pressure seawater inlet of the original seawater desalination system; One outlet of the booster pump (5) is connected to the inlet of the seventh manual ball valve (25), another outlet is connected to the inlet of the cleaning water tank (1), and the third outlet is connected to the high-pressure inlet of each PX energy recovery device. The high-pressure seawater outlet of the original seawater desalination system is connected to the high-pressure inlet of each PX energy recovery device. The low-pressure outlet of each PX energy recovery device is divided into two outlets: one outlet is connected to the inlet of the cleaning water tank (1), and the other outlet is connected to the low-pressure seawater inlet of the original seawater desalination system. The booster pump (5), the first electric ball valve (17) are connected to the control system (47).

2. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 1, characterized in that, A third manual ball valve (21), a second filter (3), a high-pressure plunger pump (6), a fourth manual ball valve (22), and a second pressure gauge (13) are installed on the pipeline between the outlet of the cleaning water tank (1) and the inlet of the first electric ball valve (17). The high-pressure plunger pump (6) is connected to the control system (47).

3. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 2, characterized in that, A first manual ball valve (19), a first filter (2) and a water pump (4) are installed between the outlet of the cleaning water tank (1) and the second manual ball valve (20). The water pump (4) is connected to the control system (47).

4. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 3, characterized in that, The first flow meter (7) and the first pressure gauge (12) are installed on the pipeline at the outlet of the second manual ball valve (20). The first flow meter (7) is connected to the control system (47).

5. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 4, characterized in that, The high-pressure outlet of the first PX energy recovery device (45) is connected to the fifth manual ball valve (23) and the booster pump (5) via the twelfth manual ball valve (30), and the other is connected to the high-pressure seawater inlet of the original seawater desalination system via the eleventh manual ball valve (29).

6. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 5, characterized in that, A third pressure gauge (14) and a second flow meter (8) are installed on the pipeline between the twelfth manual ball valve (30) and the fifth manual ball valve (23). The second flow meter (8) is connected to the control system (47).

7. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 6, characterized in that, The bottom of the cleaning water tank (1) is equipped with a 25th manual ball valve (43) for emptying; a level gauge (11) is installed inside the cleaning water tank (1), and the level gauge (11) is connected to the control system (47).

8. The online automatic maintenance cleaning system for PX energy recovery devices according to claim 7, characterized in that, The water supply pump (4), the booster pump (5) and the high-pressure plunger pump (6) are variable frequency pumps.

Images