Automatic cleaning device and method for reverse osmosis system for valve cooling

Abstract

The invention relates to an automatic cleaning device and method for a reverse osmosis system for valve cooling, the automatic cleaning device for the reverse osmosis system for valve cooling comprises a water inlet branch, a reverse osmosis assembly and a cleaning branch, the reverse osmosis branch comprises a reverse osmosis membrane, and a water inlet pipe section is provided with a first water pressure sensor and a first water inlet electric valve; a concentrated water outlet of the reverse osmosis branch is connected to a waste discharge pipe section, and a second water pressure sensor is arranged on the waste discharge pipe section; a water production port of the reverse osmosis branch is connected to a water production pipe section; a water production electric valve and a water production loop electric valve are arranged on the water production pipe section; the cleaning branch comprises a cleaning box, an alkali adding pipeline assembly, an acid adding pipeline assembly and a circulating pipeline assembly; the cleaning box is further connected with a cleaning backflow pipe section, and the other end of the cleaning backflow pipe section is connected to the waste discharge pipe section. The cleaning box is further connected with an electric heater, a temperature sensor and a PH sensor. The automatic cleaning device realizes automatic detection, automatic cleaning liquid preparation, automatic cleaning and mode switching, is more intelligent, and reduces the manual maintenance difficulty and cost.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis systems for cooling converter valves, and specifically to an automatic cleaning device and method for a reverse osmosis system used for valve cooling. Background Technology

[0002] Converter valves are core equipment in DC transmission projects, and the cooling system of the converter valve, as a key component, is crucial for its normal operation. Given domestic environmental conditions, over 80% of the external cooling equipment in converter valve cooling systems utilizes cooling towers. Cooling towers primarily cool the internal cooling water by spraying water onto the surface of the cooling tower coils. If poor-quality industrial water is used directly for spraying, scale easily forms on the surface of the cooling tower coils, reducing the cooling tower's heat dissipation capacity and posing a significant threat to the stable operation of the converter valve cooling system. Therefore, industrial water must be treated by a reverse osmosis system before being used as spray water for the cooling tower. During normal operation, the reverse osmosis membrane requires periodic cleaning and maintenance to ensure that the quality and flow rate of the reverse osmosis permeate meet the cooling tower's requirements. Failure to clean the reverse osmosis system promptly and effectively will affect its normal water production and greatly increase the risk of scale formation on the cooling tower coil surface.

[0003] Utility model patent CN222468643U discloses a reverse osmosis membrane cleaning device for DC power transmission projects. This device can be transported to the reverse osmosis equipment site. Membrane elements removed from the reverse osmosis equipment can be installed in the membrane housing of this patent. A water pump then circulates cleaning solution from a tank to the membrane housing to clean the membrane elements. In practice, determining when reverse osmosis equipment should be cleaned and the effectiveness of the cleaning is problematic. Delayed cleaning can lead to reduced performance of the reverse osmosis equipment, affecting normal water production and increasing the risk of scaling on cooling tower coils. While existing cleaning methods can meet certain requirements, they rely on manual management, making timely and effective cleaning difficult. Furthermore, disassembling and cleaning reverse osmosis equipment is complex and labor-intensive, posing significant challenges and difficulties for maintenance personnel. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic cleaning device and method for a reverse osmosis system for valve cooling, which solves the technical problem that it is difficult to achieve timely and effective cleaning by relying on manual management and cleaning in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An automatic cleaning device for a reverse osmosis system for valve cooling includes an inlet branch, a reverse osmosis component, and a cleaning branch. The inlet branch includes a first filter and a first water pump connected in series on the inlet pipe section. The reverse osmosis branch includes at least one set of reverse osmosis membranes. The inlet of the reverse osmosis branch is connected to the inlet pipe section, which is equipped with a first water pressure sensor and a first inlet electric valve. The concentrate outlet of the reverse osmosis branch is connected to the waste discharge pipe section, which is equipped with a first concentrate outlet electric valve and a second water pressure sensor. The product water outlet of the reverse osmosis branch is connected to the product water pipe section, which is equipped with a product water electric valve and a product water loop electric valve. The cleaning branch includes a cleaning tank, which is connected to an alkali addition pipeline assembly, an acid addition pipeline assembly, and a circulation pipeline assembly. The circulation pipeline assembly is connected to a cleaning liquid delivery pipeline section, and the other end of the cleaning liquid delivery pipeline section is connected to the water inlet pipeline section. The cleaning liquid delivery pipeline section is equipped with a cleaning electric valve. The cleaning tank is also connected to a cleaning return pipe section, which is equipped with a cleaning wastewater electric valve; the waste discharge pipe section is equipped with a waste discharge electric valve; one end of the cleaning return pipe section is connected to the waste discharge pipe section, and the connection position is located between the second water pressure sensor and the waste discharge electric valve; the cleaning tank is also connected to a product water branch pipe section, the other end of which is connected to the product water pipe section, and the product water branch pipe section is equipped with a cleaning product water electric valve; the cleaning tank is also connected to an electric heater, a temperature sensor, and a pH sensor; The bottom of the cleaning tank is equipped with a drain pipe, and the drain pipe is equipped with an electric drain valve.

[0006] Furthermore, the first filter consists of two connected in parallel, and the first water pump consists of two connected in parallel; an oxidation-reduction potential sensor and a conductivity sensor are installed on the inlet pipe section between the first filter and the first water pump.

[0007] Furthermore, the reverse osmosis branch includes two sets of reverse osmosis membranes connected in series, defined as a first-stage reverse osmosis membrane and a second-stage reverse osmosis membrane. A secondary water pipe section is provided between the concentrate outlet of the first-stage reverse osmosis membrane and the inlet of the second-stage reverse osmosis membrane. The secondary water pipe section is equipped with a second concentrate outlet electric valve, a third water pressure sensor, and a second inlet electric valve.

[0008] Furthermore, the water production pipeline section includes a first water production drain pipe, a second water production drain pipe, and a main water production drain pipe arranged in parallel. The water production electric valve includes a first water production electric valve and a second water production electric valve, which are respectively installed on the first water production drain pipe and the second water production drain pipe. The water production circuit electric valve is installed on the main water production drain pipe, which is used to send the purified water to the demineralized water tank. The water production branch pipe section is connected to the water production pipeline section upstream of the water production circuit electric valve.

[0009] Furthermore, the automatic cleaning device for the reverse osmosis system for valve cooling also includes a first bypass pipeline and a second bypass pipeline, with a first bypass electric valve and a second bypass electric valve respectively installed on the first bypass pipeline and the second bypass pipeline; one end of the first bypass pipeline is connected to the inlet water section, with the connection position located between the first water pressure sensor and the first inlet water electric valve; the other end of the first bypass pipeline is connected to the secondary water section, with the connection position located between the second concentrate outlet electric valve and the third water pressure sensor; One end of the second bypass pipe is connected to the secondary water pipe section, with the connection point located between the third water pressure sensor and the second inlet electric valve; the other end of the second bypass pipe is connected to the waste discharge pipe section, with the connection point located between the first concentrated water outlet electric valve and the second water pressure sensor.

[0010] Furthermore, the circulation pipeline assembly includes a circulation pipeline, a second water pump, and a cleaning fluid circulation electric valve. One end of the cleaning fluid delivery pipeline is connected to the circulation pipeline, and the cleaning fluid delivery pipeline is also equipped with a flow sensor and a second filter.

[0011] An automatic cleaning method for a reverse osmosis system used for valve cooling includes the following steps. The automatic cleaning method for the reverse osmosis system for valve cooling includes the following steps: S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The permeate after the reverse osmosis membrane treatment enters the desalination water tank and is used as the spray water for the cooling tower. The concentrate after the reverse osmosis membrane treatment enters the wastewater tank through the waste discharge pipe section. S2: When the pressure difference between the inlet side and the concentrate outlet side of the reverse osmosis membrane is greater than the set value, the automatic cleaning state is entered. The acid solution can be prepared in either (1) or (2): (1) Add acid to the cleaning tank using the acid addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the acid solution mix evenly to the set pH value; (2) Add acid solution that meets the set requirements directly to the cleaning tank; after the acid addition is completed, heat the acid solution in the cleaning tank to the set temperature. S3: Stop the water supply to the inlet branch, close the electric valve of the product water circuit and the electric valve of the waste discharge circuit, and open the electric valve of the cleaning circuit, the electric valve of the cleaning product water circuit and the electric valve of the cleaning waste water circuit. The acid in the cleaning tank enters the reverse osmosis membrane through the cleaning liquid delivery pipe section, the product water of the reverse osmosis membrane enters the cleaning tank through the product water pipe section and the product water branch pipe section, and the concentrate of the reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. S4: After pickling, close the cleaning electric valve and drain the acid in the cleaning tank. The preparation of alkaline solution can be done in either (1) or (2): (1) Add alkali to the cleaning tank using the alkali addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and use the circulation pipeline assembly to mix the alkaline solution evenly to the set pH value under the detection of the pH sensor; (2) Add the alkaline solution that meets the set requirements directly to the cleaning tank; After adding alkali, heat the alkaline solution in the cleaning tank to the set temperature; Close the cleaning liquid circulation electric valve in the circulation pipeline assembly, open the cleaning electric valve, and the alkaline solution in the cleaning tank enters the reverse osmosis membrane through the cleaning liquid delivery pipeline section. The product water of the reverse osmosis membrane enters the cleaning tank through the product water pipeline section and the product water branch pipe section. The concentrate of the reverse osmosis membrane enters the cleaning tank through the cleaning return pipeline section. S5: After cleaning is completed, close the cleaning electric valve, the cleaning product water electric valve, and the cleaning waste water electric valve; open the product water circuit electric valve, the waste discharge electric valve, and restore the water supply to the inlet branch.

[0012] The automatic cleaning method for the reverse osmosis system for valve cooling includes the following steps: S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The permeate after the reverse osmosis membrane treatment enters the desalination water tank and is used as the spray water for the cooling tower. The concentrate after the reverse osmosis membrane treatment enters the wastewater tank through the waste discharge pipe section. S2: When the pressure difference between the inlet side and the concentrate outlet side of the reverse osmosis membrane is greater than the set value, the automatic cleaning state is entered. The acid solution can be prepared in either (1) or (2): (1) Add acid to the cleaning tank using the acid addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the acid solution mix evenly to the set pH value; (2) Add acid solution that meets the set requirements directly to the cleaning tank; after the acid addition is completed, heat the acid solution in the cleaning tank to the set temperature. S3: Acid washing of the first stage reverse osmosis membrane: Stop the water supply to the inlet branch, close the electric valve of the permeate circuit, the second permeate electric valve, and the waste discharge electric valve, and open the cleaning electric valve, the cleaning permeate electric valve, and the cleaning wastewater electric valve; close the first bypass electric valve and the first concentrate outlet electric valve, and open the cleaning electric valve, the first permeate electric valve, and the second bypass electric valve. The acid solution in the cleaning tank enters the first stage reverse osmosis membrane through the cleaning solution delivery pipe section. The permeate from the first stage reverse osmosis membrane enters the cleaning tank through the first permeate drain pipe and the permeate branch pipe section. The concentrate from the first stage reverse osmosis membrane enters the cleaning tank through the second bypass pipe and the cleaning return pipe section. S4: Acid washing of the two-stage reverse osmosis membrane: After the set acid washing time of the first-stage reverse osmosis membrane, open the second permeate electric valve, the first bypass electric valve, and the first concentrate outlet electric valve, and close the second bypass electric valve, the first inlet electric valve, the first permeate electric valve, and the second concentrate outlet electric valve. The acid solution in the cleaning tank enters the second-stage reverse osmosis membrane through the cleaning solution delivery pipe section and the first bypass pipe. The permeate from the second-stage reverse osmosis membrane enters the cleaning tank through the second permeate drain pipe and the permeate branch pipe section. The concentrate from the second-stage reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. After acid washing is completed, close the cleaning electric valve, the first bypass electric valve, the first concentrate outlet electric valve, and the second permeate electric valve to discharge the acid solution in the cleaning tank. S5: Alkaline washing of a first-stage reverse osmosis membrane: Alkaline solution can be prepared in either (1) or (2) way: (1) Alkaline solution is added to the cleaning tank by the alkali addition pipeline assembly, and water is added to the cleaning tank by the permeate branch pipe section. Under the detection of the pH sensor, the alkali solution is mixed evenly to the set pH value by the circulation pipeline assembly; (2) Alkaline solution that meets the set requirements is added directly to the cleaning tank; after the alkali addition is completed, the alkali solution in the cleaning tank is heated to the set temperature; the cleaning liquid circulation electric valve is closed, and the cleaning electric valve, the first inlet electric valve, the second concentrate outlet electric valve, the second bypass electric valve and the first permeate electric valve are opened; the alkali solution in the cleaning tank enters the first-stage reverse osmosis membrane through the cleaning liquid delivery pipeline section, the first permeate drain pipe and the permeate branch pipe section of the first-stage reverse osmosis membrane enter the cleaning tank, and the concentrate of the reverse osmosis membrane enters the cleaning tank through the second bypass pipeline and the cleaning return pipeline section; S6: Alkaline washing of the second-stage reverse osmosis membrane: After the set time for alkaline washing of the first stage reverse osmosis membrane, the first bypass electric valve, the second inlet electric valve, the first concentrate outlet electric valve, and the second product water electric valve are opened, and the second bypass electric valve, the first inlet electric valve, the first product water electric valve, and the second concentrate outlet electric valve are closed. The alkaline solution in the cleaning tank enters the second stage reverse osmosis membrane through the cleaning solution delivery pipe section and the first bypass pipe. The product water of the second stage reverse osmosis membrane enters the cleaning tank through the second product water drain pipe and the product water branch pipe section. The concentrate of the reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. S7: After cleaning, close the cleaning electric valve, cleaning product water electric valve, cleaning waste water electric valve and the first bypass electric valve; drain the alkaline solution from the cleaning tank; open the product water circuit electric valve, waste discharge electric valve, first inlet electric valve and second concentrated water outlet electric valve, and restore the water supply to the inlet branch.

[0013] Furthermore, during the preparation of acid and alkali solutions in the cleaning tank, when water needs to be added, the water supply of the inlet branch is activated, and the water flows into the product water branch section after passing through the corresponding reverse osmosis membrane; after the water is added, the water supply of the inlet branch is shut off; the water level is detected by the level sensor in the cleaning tank.

[0014] The beneficial effects of this invention are: This invention utilizes pressure sensors on both the inlet and outlet sides of the reverse osmosis membrane to monitor the pressure difference in real time. Upon reaching a set value, it automatically enters the cleaning mode, avoiding the problems of manual inspection and untimely cleaning. In cleaning mode, acid washing is performed first, automatically preparing an acid solution with the required pH and temperature. Through automatic loop switching, the acid solution enters the reverse osmosis membrane to react and treat any attached impurities. After acid washing, an alkaline solution is automatically prepared for a second alkaline wash of the reverse osmosis membrane. Ultimately, the reverse osmosis membrane meets the requirements, and then the loop is automatically switched, cutting off the cleaning branch, and the reverse osmosis membrane enters normal water treatment mode, enabling normal water production. This invention's automatic cleaning device can automatically detect the cleaning timing, automatically prepare the cleaning solution, complete online cleaning, and switch between cleaning and normal operating modes. It eliminates the need to disassemble the reverse osmosis membrane and requires no manual intervention, greatly reducing maintenance difficulty, ensuring the reverse osmosis membrane is in good working condition, guaranteeing water quality, extending the membrane's lifespan, and reducing maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the automatic cleaning device for the reverse osmosis system used in valve cooling according to the present invention; 10. First-stage reverse osmosis membrane; 11. Second-stage reverse osmosis membrane; 12. Waste discharge electric valve; 13. Cleaning wastewater electric valve; 14. Product water loop electric valve; 15. Cleaning product water electric valve; 16. Acid pump; 17. Alkali pump; 18. Cleaning tank; 19. pH sensor; 20. Temperature sensor; 21. Electric heater; 22. Second water pump; 23. Second filter; 24. Flow sensor; 25. Cleaning electric valve; 26. Cleaning solution circulation electric valve; 27. Drain electric valve; 31. First filter 32. Oxidation-reduction potential sensor; 33. Conductivity sensor; 34. First water pump; 41. Demineralized water tank; 42. Wastewater tank; 51. First water pressure sensor; 52. Second water pressure sensor; 53. Third water pressure sensor; 61. First inlet electric valve; 62. Second inlet electric valve; 71. First concentrate outlet electric valve; 72. Second concentrate outlet electric valve; 81. First product water electric valve; 82. Second product water electric valve; 91. First bypass electric valve; 92. Second bypass electric valve; a. Cleaning fluid delivery pipe section; b. First product water drain pipe; c. Second product water drain pipe; d. Product water branch pipe section; e. Cleaning return pipe section; f. Circulation pipeline; g. Inlet branch pipe. Detailed Implementation The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0016] Embodiments of the present invention: like Figure 1 As shown, an automatic cleaning device for a reverse osmosis system for valve cooling includes an inlet branch g, a reverse osmosis assembly, and a cleaning branch. The inlet branch g includes a first filter 31 and a first water pump 34 connected in series on the inlet pipe section for inputting industrial water, which is treated by the reverse osmosis assembly. After the reverse osmosis membrane becomes clogged after working for a period of time, the cleaning branch is automatically started to clean the reverse osmosis membrane online.

[0017] The first filter 31 is a security filter for preliminary filtration of industrial water; this security filter is existing technology. The first water pump 34 is a high-pressure water pump. Both the first filter 31 and the first water pump 34 are connected in parallel, with one in operation and one on standby. If one fails, the equipment can continue to operate to ensure normal water production from the reverse osmosis system. However, in practical applications where equipment reliability requirements are not high, only one high-pressure water pump and one security filter can be used. An oxidation-reduction potential sensor 32 and a conductivity sensor 33 are installed on the inlet pipe section between the first filter 31 and the first water pump 34.

[0018] The reverse osmosis branch includes at least one set of reverse osmosis membranes. The inlet of the reverse osmosis branch is connected to the inlet pipe section, and the inlet pipe section is equipped with a first water pressure sensor 51 and a first inlet electric valve 61. The concentrate outlet of the reverse osmosis branch is connected to the waste discharge pipe section, and the waste discharge pipe section is equipped with a first concentrate outlet electric valve 71, a second water pressure sensor 52, and a waste discharge electric valve 12.

[0019] The product water outlet of the reverse osmosis branch is connected to the product water pipe section. The product water pipe section is equipped with a product water electric valve and a product water circuit electric valve 14. The produced product water (treated water suitable for cooling) flows into the demineralized water tank 41 and is used as spray water for the cooling tower.

[0020] In this embodiment, the reverse osmosis branch includes two sets of reverse osmosis membranes connected in series, defined as a first-stage reverse osmosis membrane 10 and a second-stage reverse osmosis membrane 11. A secondary water pipe section is provided between the concentrate outlet of the first-stage reverse osmosis membrane 10 and the inlet of the second-stage reverse osmosis membrane 11. The secondary water pipe section is equipped with a second concentrate outlet electric valve 72, a third water pressure sensor 53, and a second inlet electric valve 62.

[0021] The automatic cleaning device for the reverse osmosis system for valve cooling also includes a first bypass pipe and a second bypass pipe. The first bypass pipe and the second bypass pipe are respectively equipped with a first bypass electric valve 91 and a second bypass electric valve 92. One end of the first bypass pipe is connected to the inlet pipe section, and the connection position is located between the first water pressure sensor 51 and the first inlet electric valve 61. The other end of the first bypass pipe is connected to the secondary water pipe section, and the connection position is located between the second concentrate outlet electric valve 72 and the third water pressure sensor 53.

[0022] One end of the second bypass pipe is connected to the secondary water pipe section, with the connection point located between the third water pressure sensor 53 and the second inlet electric valve 62; the other end of the second bypass pipe is connected to the waste discharge pipe section, with the connection point located between the first concentrate outlet electric valve 71 and the second water pressure sensor 52. The bypass pipe is not used during normal water treatment but is used when cleaning the reverse osmosis membrane.

[0023] The water production pipeline section includes a first water production drain pipe b, a second water production drain pipe c, and a main water production drain pipe, all connected in parallel. The water production electric valves include a first water production electric valve 81 and a second water production electric valve 82, which are respectively installed on the first water production drain pipe b and the second water production drain pipe c. The first water production drain pipe b and the second water production drain pipe c converge into the main water production drain pipe. The water production circuit electric valve 14 is installed on the main water production drain pipe, which is used to send the purified water to the demineralized water tank 41.

[0024] The cleaning branch includes a cleaning tank 18, which is connected to an alkali addition pipeline assembly, an acid addition pipeline assembly, and a circulation pipeline assembly. The alkali addition pipeline assembly includes an alkali tank and is equipped with an alkali addition pump 17; the acid addition pipeline assembly includes an acid tank and is equipped with an acid addition pump 16. Acidic and alkaline cleaning solutions are used to remove contaminants such as calcium carbonate scale, calcium sulfate scale, metal oxide scale, and silicon deposits from the reverse osmosis membrane. Commonly used acids and alkalis in existing technologies, such as hydrochloric acid, citric acid, and sodium hydroxide solution, are employed.

[0025] The cleaning tank 18 is also connected to an electric heater 21, a temperature sensor 20, a pH sensor 19, and a liquid level sensor.

[0026] The bottom of the cleaning tank 18 is equipped with a drain pipe, and the drain pipe is equipped with a drain electric valve 27.

[0027] The circulation pipeline assembly is connected to a cleaning fluid delivery pipe section a, the other end of which is connected to the inlet water pipe section. A cleaning electric valve 25 is installed on the cleaning fluid delivery pipe section a. A flow sensor 24 and a second filter 23 are also installed on the cleaning fluid delivery pipe section a.

[0028] The cleaning tank 18 is also connected to a cleaning return pipe section e, the other end of which is connected to a waste discharge pipe section. A cleaning wastewater electric valve 13 is installed on the cleaning return pipe section e. One end of the cleaning return pipe section e is connected to the waste discharge pipe section, and the connection position is located between the second water pressure sensor 52 and the waste discharge electric valve 12.

[0029] The cleaning tank 18 is also connected to a product water branch pipe section d, the other end of which is connected to the product water pipe section, specifically to the product water drain main pipe. A cleaning product water electric valve 15 is installed on the product water branch pipe section d, and the connection point between the product water branch pipe section d and the product water drain main pipe is upstream of the product water circuit electric valve 14. The flow direction of the product water can be controlled by switching between the product water circuit electric valve 14 and the cleaning product water electric valve 15.

[0030] The circulation pipeline assembly includes a circulation pipeline f, a second water pump 22, and a cleaning fluid circulation electric valve 26. One end of the cleaning fluid delivery pipe section a is connected to the circulation pipeline f. Both ends of the circulation pipeline f are connected to the cleaning tank 18. The second water pump 22 is connected to the circulation pipeline f to provide circulation power. When preparing the cleaning solution, circulation for a certain period of time can make it more uniform.

[0031] like Figure 1 As shown, the automatic cleaning method for the valve cooling reverse osmosis system includes the following steps: In this embodiment, the first and second stages of reverse osmosis membranes are cleaned in stages, that is, the first stage is acid-washed first, then the second stage is acid-washed, then the first stage is alkali-washed, and finally the second stage is alkali-washed.

[0032] S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The treated water enters the desalination tank 41 and is used as the spray water for the cooling tower. The concentrated water treated by the reverse osmosis membrane enters the wastewater tank 42 through the waste discharge pipe section. S2: When the pressure difference between the feed water side and the concentrate outlet side of the reverse osmosis membrane exceeds the set value, the automatic cleaning state is activated. The pressure difference is obtained by processing and calculating the data detected by the pressure sensors on both sides (the pressure difference calculation method itself is existing technology), and compared with the set value. The difference between the first and third pressure sensors reflects the clogging status of the first stage of reverse osmosis membrane 10, and the difference between the second and third pressure sensors reflects the clogging status of the second stage of reverse osmosis membrane 11. If the first stage of reverse osmosis membrane 10 is in the first stage, the pressure difference across the first stage of reverse osmosis membrane 10 will reach the set value first.

[0033] First, prepare the cleaning solution. The preparation of the acid solution can be done in either (1) or (2). In this embodiment, (1) is preferred: (1) Add acid to the cleaning tank 18 using the acid addition pipeline assembly, and add water to the cleaning tank 18 using the water production branch pipe section d (open the cleaning water production electric valve 15 to use the production water). Detect the water level using the level sensor, and stop adding water when the set value is reached. Under the detection of the pH sensor 19, use the circulation pipeline assembly to mix the acid solution evenly to the set pH value. If the pH value meets the requirements, stop adding acid. (2) Add the acid solution that meets the set requirements directly to the cleaning tank 18 without mixing with water. The acid tank volume required in the above scheme that requires mixing with water will be relatively smaller. After adding acid, heat the acid solution in the cleaning tank 18 to the set temperature. During the heating process, circulation can continue. After heating to the set temperature, close the cleaning solution circulation electric valve 26.

[0034] S3: Acid washing of the first stage of reverse osmosis membrane 10: Stop the water supply of the inlet branch g, close the electric valve 14 of the product water circuit, the second electric valve 82 of the product water circuit, and the electric valve 12 of the waste discharge circuit, and open the electric valve 25 of the cleaning circuit, the electric valve 15 of the cleaning product water circuit, and the electric valve 13 of the cleaning waste water circuit; close the first bypass electric valve 91 and the first concentrated water outlet electric valve 71, and open the electric valve 25 of the cleaning circuit, the first electric valve 81 of the product water circuit, and the second bypass electric valve 92. Under the action of the second water pump 22, the acid solution in the cleaning tank 18 enters the first stage of reverse osmosis membrane 10 through the cleaning solution delivery pipe section a, the product water of the first stage of reverse osmosis membrane 10 enters the cleaning tank 18 through the first product water drain pipe b and the product water branch pipe section d, and the concentrated water of the first stage of reverse osmosis membrane 10 enters the cleaning tank 18 through the second bypass pipe and the cleaning return pipe section e.

[0035] The working status of the acid pump 16 can be determined by the flow sensor 24 on the cleaning fluid delivery pipe section a. If the flow rate is less than the set value, the output power of the acid pump 16 can be increased.

[0036] S4: Acid washing of the second-stage reverse osmosis membrane 11: After the set acid washing time of the first-stage reverse osmosis membrane 10, open the second permeate electric valve 82, the first bypass electric valve 91, and the first concentrate outlet electric valve 71, and close the second bypass electric valve 92, the first inlet electric valve 61, the first permeate electric valve 81, and the second concentrate outlet electric valve 72. The acid solution in the cleaning tank 18 enters the second-stage reverse osmosis membrane 11 through the cleaning solution delivery pipe section a and the first bypass pipe. The permeate from the second-stage reverse osmosis membrane 11 flows through the first... The product water drain pipe c and the product water branch pipe section d enter the cleaning tank 18. The concentrate from the second-stage reverse osmosis membrane 11 enters the cleaning tank 18 through the cleaning return pipe section e. After acid washing is completed, the cleaning electric valve 25, the first bypass electric valve 91, the first concentrate outlet electric valve 71, and the second product water electric valve 82 are closed. The drain electric valve 27 is opened to drain the acid from the cleaning tank 18. The draining time can be calculated based on the capacity, and the completion of draining can be determined by setting the time. After draining, the drain electric valve 27 is closed. After draining, before adding alkali, the cleaning tank 18 does not need to be rinsed with water, which will not affect the cleaning effect.

[0037] S5: Alkali washing of a section of reverse osmosis membrane 10: The preparation of alkaline solution can also be done in the manner of (1) or (2). In this embodiment, (1) is preferred: (1) Alkali is added to the cleaning tank 18 by the alkaline addition pipeline assembly, and water is added to the cleaning tank 18 by the product water branch pipe section d. Under the detection of pH sensor 19, the alkaline solution is mixed evenly to the set pH value by the circulation pipeline assembly; (2) Alkaline solution that meets the set requirements is directly added to the cleaning tank 18. After alkali addition is completed, the alkali solution in the cleaning tank 18 is heated to the set temperature; the cleaning solution circulation electric valve 26 is closed, and the cleaning electric valve 25, the first water inlet electric valve 61, the second concentrate outlet electric valve 72, the second bypass electric valve 92, and the first product water electric valve 81 are opened; the alkali solution in the cleaning tank 18 enters the first reverse osmosis membrane 10 through the cleaning solution delivery pipe section a, the first product water drain pipe b and the product water branch pipe section d of the first reverse osmosis membrane 10 enter the cleaning tank 18, and the concentrate of the reverse osmosis membrane enters the cleaning tank 18 through the second bypass pipe and the cleaning return pipe section e.

[0038] S6: Alkali washing of the second-stage reverse osmosis membrane 11: After the alkaline washing time of the first reverse osmosis membrane 10 is set, the first bypass electric valve 91, the second inlet electric valve 62, the first concentrate outlet electric valve 71, and the second product water electric valve 82 are opened, and the second bypass electric valve 92, the first inlet electric valve 61, the first product water electric valve 81, and the second concentrate outlet electric valve 72 are closed. The alkaline solution in the cleaning tank 18 enters the second reverse osmosis membrane 11 through the cleaning solution delivery pipe section a and the first bypass pipe. The product water of the second reverse osmosis membrane 11 enters the cleaning tank 18 through the second product water drain pipe c and the product water branch pipe section d. The concentrate of the reverse osmosis membrane enters the cleaning tank 18 through the cleaning return pipe section e.

[0039] S7: After cleaning is completed, close the cleaning electric valve 25, the cleaning product water electric valve 15, the cleaning waste water electric valve 13 and the first bypass electric valve 91; drain the alkaline solution from the cleaning tank 18; open the product water circuit electric valve 14, the waste discharge electric valve 12, the first inlet water electric valve 61 and the second concentrated water outlet electric valve 72, and restore the water supply to the inlet branch g. The two reverse osmosis membranes enter the normal water treatment working mode.

[0040] Furthermore, during the preparation of acid and alkali solutions in the cleaning tank 18, when water needs to be added, the water supply of the inlet branch g is started, and the water flows into the product water branch section d after passing through the corresponding reverse osmosis membrane; after the water is added, the water supply of the inlet branch g is turned off; the water level is detected by the level sensor in the cleaning tank 18.

[0041] The above cleaning method is for the case of two reverse osmosis membranes and requires the use of bypass pipelines. In other embodiments, if only one reverse osmosis membrane 10 is used, the cleaning method is similar, but the steps are simpler, as follows.

[0042] An automatic cleaning method for a reverse osmosis system used for valve cooling includes the following steps: S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The treated water enters the desalination tank 41 and is used as spray water for the cooling tower. The concentrated water treated by the reverse osmosis membrane enters the wastewater tank 42 through the waste discharge pipe section.

[0043] S2: When the pressure difference between the inlet and outlet sides of the reverse osmosis membrane exceeds the set value, the automatic cleaning state is entered. The acid addition pipeline assembly adds acid to the cleaning tank 18, and water is added to the cleaning tank 18 through the product water branch pipe section d. Under the detection of the pH sensor 19, the acid solution is mixed evenly to the set pH value through the circulation pipeline assembly. After the acid addition is completed, the acid solution in the cleaning tank 18 is heated to the set temperature. The circulation can continue during the heating process. After the set temperature is reached, the cleaning solution circulation electric valve 26 is closed.

[0044] S3: Pickling Stop the water supply to the inlet branch g, close the electric valve 14 of the product water circuit and the electric valve 12 of the waste water discharge circuit, and open the electric valve 25 of the cleaning circuit, the electric valve 15 of the cleaning product water circuit and the electric valve 13 of the cleaning waste water circuit. Under the action of the second water pump 22, the acid solution in the cleaning tank 18 enters the reverse osmosis membrane through the cleaning liquid delivery pipe section a, the product water of the reverse osmosis membrane enters the cleaning tank 18 through the product water pipe section and the product water branch pipe section d, and the concentrate from the concentrate outlet of the reverse osmosis membrane enters the cleaning tank 18 through the cleaning return pipe section e.

[0045] S4: Alkali washing: After pickling is complete, close the cleaning electric valve 25 and open the drain electric valve 27 to drain the acid from the cleaning tank 18. Then, start the alkali addition pipeline assembly to add alkali to the cleaning tank 18. Add water to the cleaning tank 18 using the product water branch pipe section d (the level sensor detects whether the level has reached the set value). Under the detection of the pH sensor 19, use the circulation pipeline assembly to mix the alkali solution evenly to the set pH value. After adding alkali, heat the alkali solution in the cleaning tank 18 to the set temperature. Circulation can continue during the heating process. After heating to the set temperature, close the cleaning solution circulation electric valve 26.

[0046] Open the cleaning electric valve 25. The alkaline solution in the cleaning tank 18 enters the reverse osmosis membrane through the cleaning solution delivery pipe section a. The permeate from the reverse osmosis membrane enters the cleaning tank 18 through the permeate pipe section and the permeate branch pipe section d. The concentrate from the reverse osmosis membrane enters the cleaning tank 18 through the cleaning return pipe section e.

[0047] S5: After cleaning is completed, close the cleaning electric valve 25, the cleaning product water electric valve 15, and the cleaning waste water electric valve 13; open the product water circuit electric valve 14, the waste discharge electric valve 12, and restore the water supply of the inlet branch g. The reverse osmosis membrane enters the normal water treatment working mode.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic cleaning device for a reverse osmosis system used in valve cooling, characterized in that: It includes an inlet branch, a reverse osmosis component, and a cleaning branch. The inlet branch includes a first filter and a first water pump connected in series on the inlet pipe section. The reverse osmosis branch includes at least one set of reverse osmosis membranes. The inlet of the reverse osmosis branch is connected to the inlet pipe section, which is equipped with a first water pressure sensor and a first inlet electric valve. The concentrate outlet of the reverse osmosis branch is connected to the waste discharge pipe section, which is equipped with a first concentrate outlet electric valve and a second water pressure sensor. The product water outlet of the reverse osmosis branch is connected to the product water pipe section, which is equipped with a product water electric valve and a product water loop electric valve. The cleaning branch includes a cleaning tank, which is connected to an alkali addition pipeline assembly, an acid addition pipeline assembly, and a circulation pipeline assembly. The circulation pipeline assembly is connected to a cleaning liquid delivery pipeline section, and the other end of the cleaning liquid delivery pipeline section is connected to the water inlet pipeline section. The cleaning liquid delivery pipeline section is equipped with a cleaning electric valve. The cleaning tank is also connected to a cleaning return pipe section, which is equipped with a cleaning wastewater electric valve; the waste discharge pipe section is equipped with a waste discharge electric valve; one end of the cleaning return pipe section is connected to the waste discharge pipe section, and the connection position is located between the second water pressure sensor and the waste discharge electric valve; the cleaning tank is also connected to a product water branch pipe section, the other end of which is connected to the product water pipe section, and the product water branch pipe section is equipped with a cleaning product water electric valve; the cleaning tank is also connected to an electric heater, a temperature sensor, and a pH sensor; The bottom of the cleaning tank is equipped with a drain pipe, and the drain pipe is equipped with an electric drain valve.

2. The automatic cleaning device for a reverse osmosis system for valve cooling according to claim 1, characterized in that: The first filter consists of two connected in parallel, and the first water pump consists of two connected in parallel; an oxidation-reduction potential sensor and a conductivity sensor are installed on the inlet pipe section between the first filter and the first water pump.

3. The automatic cleaning device for a reverse osmosis system for valve cooling according to claim 1, characterized in that: The reverse osmosis branch includes two sets of reverse osmosis membranes connected in series, defined as a first-stage reverse osmosis membrane and a second-stage reverse osmosis membrane. A secondary water pipe section is provided between the concentrate outlet of the first-stage reverse osmosis membrane and the inlet of the second-stage reverse osmosis membrane. The secondary water pipe section is equipped with a second concentrate outlet electric valve, a third water pressure sensor, and a second inlet electric valve.

4. The automatic cleaning device for a reverse osmosis system for valve cooling according to claim 3, characterized in that: The water production pipeline section includes a first water production drain pipe, a second water production drain pipe, and a main water production drain pipe arranged in parallel. The water production electric valve includes a first water production electric valve and a second water production electric valve, which are respectively installed on the first water production drain pipe and the second water production drain pipe. The water production circuit electric valve is installed on the main water production drain pipe, which is used to send the purified water to the demineralized water tank. The water production branch pipe section is connected to the water production pipeline section upstream of the water production circuit electric valve.

5. The automatic cleaning device for a reverse osmosis system for valve cooling according to claim 4, characterized in that: The automatic cleaning device for the reverse osmosis system for valve cooling also includes a first bypass pipeline and a second bypass pipeline. The first bypass pipeline and the second bypass pipeline are respectively equipped with a first bypass electric valve and a second bypass electric valve. One end of the first bypass pipeline is connected to the inlet water section, and the connection position is located between the first water pressure sensor and the first inlet water electric valve. The other end of the first bypass pipeline is connected to the secondary water section, and the connection position is located between the second concentrate outlet electric valve and the third water pressure sensor. One end of the second bypass pipe is connected to the secondary water pipe section, with the connection point located between the third water pressure sensor and the second inlet electric valve; the other end of the second bypass pipe is connected to the waste discharge pipe section, with the connection point located between the first concentrated water outlet electric valve and the second water pressure sensor.

6. The automatic cleaning device for a reverse osmosis system for valve cooling according to claim 1, characterized in that: The circulation pipeline assembly includes a circulation pipeline, a second water pump, and a cleaning fluid circulation electric valve. One end of the cleaning fluid delivery pipeline is connected to the circulation pipeline, and a flow sensor and a second filter are also installed on the cleaning fluid delivery pipeline.

7. The automatic cleaning method of the automatic cleaning device for the reverse osmosis system for valve cooling according to any one of claims 1 to 6, characterized in that: The system includes the following steps: S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The treated water enters the desalination tank and is used as spray water for the cooling tower. The concentrated water treated by the reverse osmosis membrane enters the wastewater tank through the waste discharge pipe section. S2: When the pressure difference between the inlet side and the concentrate outlet side of the reverse osmosis membrane is greater than the set value, the automatic cleaning state is entered. The acid solution can be prepared in either (1) or (2): (1) Add acid to the cleaning tank using the acid addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the acid solution mix evenly to the set pH value; (2) Add acid solution that meets the set requirements directly to the cleaning tank. After adding acid, heat the acid solution in the cleaning tank to the set temperature; S3: Stop the water supply to the inlet branch, close the electric valve of the product water circuit and the electric valve of the waste discharge circuit, and open the electric valve of the cleaning circuit, the electric valve of the cleaning product water circuit and the electric valve of the cleaning waste water circuit. The acid in the cleaning tank enters the reverse osmosis membrane through the cleaning liquid delivery pipe section, the product water of the reverse osmosis membrane enters the cleaning tank through the product water pipe section and the product water branch pipe section, and the concentrate of the reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. S4: After pickling is completed, close the cleaning electric valve and drain the acid in the cleaning tank. The alkaline solution can be prepared in either (1) or (2): (1) Add alkali to the cleaning tank using the alkali addition pipeline assembly, add water to the cleaning tank using the water production branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the alkaline solution mix evenly to the set pH value; (2) Add the alkaline solution that meets the set requirements directly to the cleaning tank. After the alkali is added, the alkali solution in the cleaning tank is heated to the set temperature; the cleaning liquid circulation electric valve in the circulation pipeline assembly is closed, and the cleaning electric valve is opened. The alkali solution in the cleaning tank enters the reverse osmosis membrane through the cleaning liquid delivery pipeline section. The permeate from the reverse osmosis membrane enters the cleaning tank through the permeate pipeline section and the permeate branch pipeline section. The concentrate from the reverse osmosis membrane enters the cleaning tank through the cleaning return pipeline section. S5: After cleaning is completed, close the cleaning electric valve, the cleaning product water electric valve, and the cleaning waste water electric valve; open the product water circuit electric valve, the waste discharge electric valve, and restore the water supply to the inlet branch.

8. The automatic cleaning method of the automatic cleaning device for the reverse osmosis system for valve cooling according to claim 5, characterized in that: The system includes the following steps: S1: When the reverse osmosis system is working normally, the industrial water is desalinated using the reverse osmosis membrane. The treated water enters the desalination tank and is used as spray water for the cooling tower. The concentrated water treated by the reverse osmosis membrane enters the wastewater tank through the waste discharge pipe section. S2: When the pressure difference between the inlet side and the concentrate outlet side of the reverse osmosis membrane is greater than the set value, the automatic cleaning state is entered. The acid solution can be prepared in either (1) or (2): (1) Add acid to the cleaning tank using the acid addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the acid solution mix evenly to the set pH value; (2) Add acid solution that meets the set requirements directly to the cleaning tank; after the acid addition is completed, heat the acid solution in the cleaning tank to the set temperature. S3: Acid washing of the first stage reverse osmosis membrane: Stop the water supply to the inlet branch, close the electric valve of the permeate circuit, the second permeate electric valve, and the waste discharge electric valve, and open the cleaning electric valve, the cleaning permeate electric valve, and the cleaning wastewater electric valve; close the first bypass electric valve and the first concentrate outlet electric valve, and open the cleaning electric valve, the first permeate electric valve, and the second bypass electric valve. The acid solution in the cleaning tank enters the first stage reverse osmosis membrane through the cleaning solution delivery pipe section. The permeate from the first stage reverse osmosis membrane enters the cleaning tank through the first permeate drain pipe and the permeate branch pipe section. The concentrate from the first stage reverse osmosis membrane enters the cleaning tank through the second bypass pipe and the cleaning return pipe section. S4: Acid washing of the second-stage reverse osmosis membrane: After the set time for acid washing of the first-stage reverse osmosis membrane, open the second permeate electric valve, the first bypass electric valve, and the first concentrate outlet electric valve, and close the second bypass electric valve, the first inlet electric valve, the first permeate electric valve, and the second concentrate outlet electric valve. The acid solution in the cleaning tank enters the second-stage reverse osmosis membrane through the cleaning solution delivery pipe section and the first bypass pipe. The permeate from the second-stage reverse osmosis membrane enters the cleaning tank through the second permeate drain pipe and the permeate branch pipe section. The concentrate from the second-stage reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. After pickling is completed, close the cleaning electric valve, the first bypass electric valve, the first concentrated water outlet electric valve and the second product water electric valve to drain the acid from the cleaning tank. S5: Alkaline washing of a reverse osmosis membrane: Alkaline solution can be prepared in either (1) or (2) way: (1) Add alkali to the cleaning tank using the alkali addition pipeline assembly, add water to the cleaning tank using the product water branch pipe section, and under the detection of the pH sensor, use the circulation pipeline assembly to make the alkali solution mix evenly to the set pH value; (2) Add the alkali solution that meets the set requirements directly to the cleaning tank. After alkali addition is completed, the alkali solution in the cleaning tank is heated to the set temperature; the cleaning solution circulation electric valve is closed, and the cleaning electric valve, the first inlet electric valve, the second concentrate outlet electric valve, the second bypass electric valve, and the first product water electric valve are opened; the alkali solution in the cleaning tank enters the first reverse osmosis membrane through the cleaning solution delivery pipe section, the first product water drain pipe and the product water branch pipe section of the first reverse osmosis membrane enter the cleaning tank, and the concentrate of the reverse osmosis membrane enters the cleaning tank through the second bypass pipe and the cleaning return pipe section; S6: Alkaline washing of the second-stage reverse osmosis membrane: After the set time for alkaline washing of the first stage reverse osmosis membrane, the first bypass electric valve, the second inlet electric valve, the first concentrate outlet electric valve, and the second product water electric valve are opened, and the second bypass electric valve, the first inlet electric valve, the first product water electric valve, and the second concentrate outlet electric valve are closed. The alkaline solution in the cleaning tank enters the second stage reverse osmosis membrane through the cleaning solution delivery pipe section and the first bypass pipe. The product water of the second stage reverse osmosis membrane enters the cleaning tank through the second product water drain pipe and the product water branch pipe section. The concentrate of the reverse osmosis membrane enters the cleaning tank through the cleaning return pipe section. S7: After cleaning, close the cleaning electric valve, cleaning product water electric valve, cleaning waste water electric valve and the first bypass electric valve; drain the alkaline solution from the cleaning tank; open the product water circuit electric valve, waste discharge electric valve, first inlet electric valve and second concentrated water outlet electric valve, and restore the water supply to the inlet branch.

9. The automatic cleaning method according to claim 8, characterized in that: During the preparation of acid and alkali solutions in the cleaning tank, when water needs to be added, the water supply of the inlet branch is started, and the water flows into the product water branch section after passing through the corresponding reverse osmosis membrane; after the water is added, the water supply of the inlet branch is turned off; the water level is detected by the water level sensor in the cleaning tank.

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