Methods for extending the service life of reverse osmosis membranes in medical central water supply systems

Abstract

The application relates to a method for prolonging the service life of a reverse osmosis membrane of a medical central centralized water supply system, and relates to the technical field of water treatment systems. The medical central centralized water supply system comprises a pretreatment system, a reverse osmosis system and a pure water tank. The pretreatment system comprises a first raw water tank and a second raw water tank connected in parallel, a first raw water pump and a second raw water pump connected in parallel, a first mechanical filter with a multi-way valve, a first activated carbon filter and a first water softener, and a first precision filter. The reverse osmosis system comprises a first high-pressure pump and a first reverse osmosis membrane group. The application improves the structure of the water supply system and the water supply control logic. Through a PLC control program, the start-stop sequence of each valve in the system is adjusted, the accumulation of concentrated water is prevented to the maximum extent, the membrane surface is protected, the reverse osmosis fouling possibility is reduced, the service life of the reverse osmosis membrane is prolonged, and through real-time pressure monitoring and setting, the problem of membrane water production side back pressure can also be prevented, the reverse osmosis membrane is protected, and the service life of the reverse osmosis membrane is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of medical water treatment system technology, and in particular to a method for extending the service life of reverse osmosis membranes in medical central water supply systems. Background Technology

[0002] Existing centralized medical water supply systems consist of a pretreatment system, a reverse osmosis system, a post-treatment system, a pure water tank, and a pure water delivery system. The water supply system uses tap water, pressurized by a raw water pump, which then passes through the pretreatment system and a precision filter before entering the reverse osmosis water purification system to provide differentiated water supply. However, the working principle of the reverse osmosis membrane dictates that after shutdown, a high concentration of concentrate will inevitably accumulate on the membrane's front side, potentially leading to scaling and affecting the membrane's lifespan. Simultaneously, back pressure on the product water side can also cause membrane damage. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control method for extending the service life of reverse osmosis membranes in medical central water supply systems. This method improves the structure and control logic of the water supply system. By using a PLC control program, the start-stop sequence of various valves in the system is adjusted to prevent concentrate accumulation to the greatest extent, thereby protecting the membrane surface, reducing the possibility of reverse osmosis scaling, and extending its service life. Real-time pressure monitoring and setting can also prevent back pressure problems on the membrane permeate side.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] Methods for extending the service life of reverse osmosis membranes in medical central water supply systems. Medical central water supply systems include a pretreatment system, a reverse osmosis system, and a pure water tank.

[0006] The pretreatment system sequentially includes a first raw water tank and a second raw water tank connected in parallel, a first raw water pump and a second raw water pump connected in parallel, a first mechanical filter, a first activated carbon filter, and a first water softener, each equipped with a multi-way valve, and a first precision filter. A first normally open manual valve is installed on the main inlet pipe of both the first and second raw water tanks. A first electric raw water inlet valve and a second electric raw water inlet valve are respectively installed on the inlet branch pipes. A connecting pipe with a second normally open manual valve is installed between the first and second raw water tanks. A first raw water pump is installed on the outlet branch pipe of each of the first and second raw water tanks. The system includes a normally open manual outlet valve for the first raw water tank and a normally open manual outlet valve for the second raw water tank. The inlet branch pipes of the first and second raw water pumps are equipped with normally open manual inlet valves for the first and second raw water pumps, respectively. The outlet branch pipes are equipped with normally open check valves for the first and second raw water pumps, respectively. The main outlet pipe is equipped with a normally open manual outlet valve for the first raw water pump. The inlet pipe of the first precision filter is equipped with a normally open inlet valve for the first precision filter. The outlet pipe is equipped with a first pre-treated product water conductivity meter. The system is connected to the reverse osmosis system and connected to the first raw water tank via a pipeline with a first electric circulation valve. The connecting pipeline between the first and second raw water tanks ensures that the liquid levels in both tanks are equal, preventing single tanks from drying out or overflowing, and also preventing frequent activation of a single electric inlet valve. The multi-way valve controls the normal operation, forward washing, and backwashing of each pre-treatment filter by switching the water flow direction.

[0007] Municipal tap water enters the first and second raw water tanks via the first normally open manual valve, the first electric raw water inlet valve, and the second electric raw water inlet valve. The effluent flows through the first and second normally open manual outlet valves of the raw water tanks, the first and second normally open manual inlet valves of the raw water pumps, and then into the various pretreatment filters via the first and second raw water pumps. The raw water then flows sequentially through the first mechanical filter, the first activated carbon filter, and the first water softener via a multi-way valve, and finally through the first precision filter's normally open inlet valve. The PLC reads the data from the first pretreatment product water conductivity meter; if the data meets the standards, the water is supplied to the reverse osmosis system; otherwise, the first electric circulation valve is opened, returning the water to the first raw water tank.

[0008] The reverse osmosis system includes a first high-pressure pump and a first reverse osmosis membrane module. The inlet pipe of the first high-pressure pump is equipped with a first pretreated permeate normally open inlet valve. The inlet pipe of the first reverse osmosis membrane module is equipped with a first reverse osmosis membrane module electric inlet valve. The RO permeate outlet pipe of the first reverse osmosis membrane module is equipped with a first check valve and connected to a pure water tank. The RO permeate outlet pipe upstream of the first check valve is equipped with a pipeline with a first RO unqualified water electric discharge valve and connected to a second raw water tank. The RO concentrate outlet pipe of the first reverse osmosis membrane module is equipped with a first concentrate electric discharge valve. The RO concentrate outlet pipe upstream of the first concentrate electric discharge valve is equipped with a pipeline with a first reflux valve and connected to the inlet pipe of the first reverse osmosis membrane module.

[0009] The number of pure water tanks can be one or multiple tanks connected in parallel. Each pure water tank has an electric inlet valve on its inlet pipe, which connects to the RO freshwater outlet pipe of the first reverse osmosis membrane unit. Outlet pipe one connects to the inlet pipe of the first high-pressure pump via a pipeline equipped with an electric pure water flushing valve. Outlet pipe two connects to the post-treatment water supply system. When there are multiple pure water tanks, the outlet pipes of each tank are interconnected.

[0010] Pretreated permeate is pressurized by the first high-pressure pump via the first pretreated permeate inlet valve and enters the first reverse osmosis membrane module through the first reverse osmosis membrane module's electric inlet valve. Reverse osmosis permeate enters the pure water tank through the corresponding pure water tank's electric inlet valve. From the pure water tank, it is supplied to the end-user point by the post-treatment water supply system and then returned to the pure water tank via a circulation pipeline. Reverse osmosis concentrate is partially returned to the first high-pressure pump through the first reflux valve with an adjusted opening, and partially discharged through a discharge pipe with an adjusted valve opening. The first concentrate electric discharge valve and the first RO substandard water electric discharge valve are started and stopped according to corresponding control programs.

[0011] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0012] S1. Pretreatment procedure: Start the first raw water pump and the second raw water pump → PLC reads the value of the conductivity meter of the first pretreatment product water. If it meets the RO inlet water requirements, start the start-up procedure. Otherwise, open the first electric circulation valve. If the standard is not met after more than 5 minutes, the alarm mode is activated, the valve is closed and the pump is stopped.

[0013] S2. Pre-start procedure: Open the electric inlet valve of the first reverse osmosis membrane module → Open the electric discharge valve of the first RO unqualified water and the first electric discharge valve of the concentrate → Close the first electric circulation valve.

[0014] S3. Normal water production procedure: After the pre-start procedure runs for 20 seconds, close the first concentrated water electric discharge valve → after 30 seconds, start the first high-pressure pump → open the electric inlet valve on the pure water tank inlet pipe → close the first RO unqualified water electric discharge valve.

[0015] S4. Flushing Procedure: Open the first concentrated water electric discharge valve, open the first RO unqualified water electric discharge valve → open the pure water electric flushing valve → close the first raw water pump and the second raw water pump → close the electric inlet valve on the pure water tank inlet pipe. The pure water in the pure water tank passes through the high-pressure pump and the reverse osmosis membrane module via the opened pure water electric flushing valve, and is then discharged from the concentrated water electric discharge valve and the RO unqualified water electric discharge valve.

[0016] S5. Shutdown procedure: After the flushing procedure runs for 30 seconds, turn off the first high-pressure pump → turn off the first concentrated water electric discharge valve → turn off the first RO unqualified water electric discharge valve → turn off the pure water electric flushing valve.

[0017] Preferably, the medical central water supply system further includes a cleaning and disinfection system. The inlet pipe of the first reverse osmosis membrane module is connected to the cleaning and disinfection system through a pipe with a first normally closed cleaning inlet valve. The RO freshwater outlet pipe upstream of the first check valve is connected to the cleaning and disinfection system through a pipe with a first normally closed cleaning freshwater outlet valve. The RO concentrate outlet pipe upstream of the first concentrate electric discharge valve is connected to the cleaning and disinfection system through a pipe with a first normally closed cleaning concentrate outlet valve.

[0018] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0019] Cleaning and disinfection procedure: When the first reverse osmosis membrane module needs cleaning and disinfection, open the first normally closed cleaning freshwater outlet valve, the first normally closed cleaning concentrate outlet valve, and the first normally closed cleaning inlet valve. The disinfectant flows into the first reverse osmosis membrane module through the first normally closed cleaning inlet valve, and then returns to the cleaning and disinfection system through the first normally closed cleaning freshwater outlet valve and the first normally closed cleaning concentrate outlet valve. After this cycle, the disinfectant is discharged, and the first reverse osmosis membrane module is rinsed with pure water through the flushing procedure to ensure the normal operation of the membrane module.

[0020] Preferably, the multi-way valve of the first water softener is connected to the first salt tank via a pipeline.

[0021] Preferably, the inlet mains of the first and second raw water tanks are equipped with a pipeline filter, a raw water conductivity meter and a raw water flow meter to monitor the quality of the incoming water. The pipeline filter not only plays a preliminary filtration role, but also protects the instruments and meters at the downstream end.

[0022] Preferably, both the first and second raw water pumps are variable frequency pumps, allowing for adjustment of their operation based on water volume changes. A dual-frequency constant pressure water supply system is employed. When terminal water usage increases, the frequency is increased, correspondingly increasing the pump speed; conversely, when terminal water usage decreases, the frequency is decreased, correspondingly decreasing the pump speed. This maintains constant water pressure within the circulation pipeline, achieving a dynamic balance between water supply and demand. If the water supply temporarily exceeds the limit, surpassing the capacity of a single pump, pump A switches to fixed frequency operation, while pump B switches to variable frequency operation. When water volume returns to normal, pump B automatically stops, and pump A switches back to variable frequency operation. This dual-pump design also ensures that one pump remains operational even if one fails.

[0023] Preferably, pressure gauges and sampling ports are installed on the pipelines before and after the first mechanical filter, the first activated carbon filter, and the first water softener. By comparing the pressure difference before and after, the degree of clogging can be determined, and the sampling ports can be used to test the water quality.

[0024] As a preferred option, each water tank is equipped with a level transmitter (PT) to read the water tank level in real time and ensure the normal operation of the control program.

[0025] Preferably, an automatic vent valve is provided after the first mechanical filter, the first activated carbon filter, and the first water softener. The automatic vent valve can release air from the pipeline, protecting the components and membrane system.

[0026] Preferably, the main inlet pipes of the first and second raw water tanks are connected to the inlet pipes of the first and second raw water pumps via a pipeline equipped with a normally closed manual inlet valve. In the event of a failure in the automatic raw water inlet, the normally closed manual inlet valve is opened to ensure the supply of raw water.

[0027] Preferably, the pretreatment system and the reverse osmosis system include two sets of devices. The pretreatment system further includes a third and a fourth raw water pump connected in parallel, a second mechanical filter with a multi-way valve, a second activated carbon filter and a second water softener, and a second precision filter. The reverse osmosis system further includes a second high-pressure pump and a second reverse osmosis membrane module.

[0028] Preferably, the RO permeate outlet pipe of the first reverse osmosis membrane unit is equipped with a first reverse osmosis permeate pressure gauge and a sampling port, and the RO permeate outlet pipe of the second reverse osmosis membrane unit is equipped with a second reverse osmosis permeate pressure gauge and a sampling port.

[0029] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0030] Dual water production process: When a single unit in the normal water production process cannot meet the water demand, a second unit is started simultaneously. The initial procedure is the same as the single unit. When both units are running together, the PLC reads the pressure values ​​of the first and second reverse osmosis permeate pressure gauges in real time. When the permeate pressure exceeds the set value, the high-pressure protection is activated, and the valves are closed and the pumps are stopped in reverse order. The check valve protects the corresponding membrane module from reverse pressure.

[0031] The advantages of this invention are: it improves the structure and control logic of the water supply system; through the PLC control program, it adjusts the start-stop sequence of each valve in the system to prevent concentrate accumulation to the greatest extent, thereby protecting the membrane surface, reducing the possibility of reverse osmosis scaling, and extending its service life; through real-time pressure monitoring and setting, it can also prevent back pressure problems on the membrane permeate side, providing protection for the reverse osmosis membrane and effectively extending its service life. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the preprocessing system in this invention (single set);

[0033] Figure 2 This is a schematic diagram of the reverse osmosis system (single set) in this invention;

[0034] Figure 3 This is a schematic diagram (two sets) of the preprocessing system in this invention;

[0035] Figure 4 This is a schematic diagram (double set) of the reverse osmosis system in this invention;

[0036] Figure 5 This is a schematic diagram of the pure water tank in this invention. Figure 1 ;

[0037] Figure 6 This is a schematic diagram of the pure water tank in this invention. Figure 2 ;

[0038] Figure 7 This is a schematic diagram of the pure water tank in this invention. Figure 3 .

[0039] Explanation of key component symbols in the diagram:

[0040] Preprocessing system:

[0041] V101A, First raw water tank; V101B, Second raw water tank; P101A, First raw water pump; P101B, Second raw water pump; P101C, Third raw water pump; P101D, Fourth raw water pump; F101A, First mechanical filter; F101B, Second mechanical filter; F102A, First activated carbon filter; F102B, Second activated carbon filter; F103A, First water softener; F103B, Second water softener; L101A, First precision filter; L101B, Second precision filter; V102A, First brine tank; V102B, Second brine tank; F104, Pipeline filter;

[0042] CE101, Raw water conductivity meter; CE102A, First pretreated product water conductivity meter; CE102B, Second pretreated product water conductivity meter;

[0043] HV116, First normally open manual valve; HV101, Second normally open manual valve; HV103A, First raw water tank normally open manual outlet valve; HV103B, Second raw water tank normally open manual outlet valve; HV105A, First raw water pump normally open manual inlet valve; HV105B, Second raw water pump normally open manual inlet valve; HV105C, Third raw water pump normally open manual inlet valve; HV105D, Fourth raw water pump normally open manual inlet valve; HV106 A. First raw water pump check valve; HV106 B. Second raw water pump check valve; HV106 C. Third raw water pump check valve; HV106 D. Fourth raw water pump check valve; HV115 A. First raw water pump normally open manual outlet valve; HV115 B. Second raw water pump normally open manual outlet valve; HV120 A. First precision filter normally open inlet valve; HV120 B. Second precision filter normally open inlet valve; HV104. Normally closed manual inlet valve;

[0044] FV101A, First raw water electric inlet valve; FV101B, Second raw water electric inlet valve; FV102A, First electric circulation valve; FV102B, Second electric circulation valve;

[0045] Reverse osmosis system:

[0046] P201A, First high-pressure pump; P201B, Second high-pressure pump; M201A, First reverse osmosis membrane module; M201B, Second reverse osmosis membrane module;

[0047] HV203A, First pretreatment permeate normally open inlet valve; HV203B, Second pretreatment permeate normally open inlet valve; HV217A, First normally closed cleaning inlet valve; HV217B, Second normally closed cleaning inlet valve; HV206A, First check valve; HV206B, Second check valve; HV208A, First normally closed cleaning permeate outlet valve; HV208B, Second normally closed cleaning permeate outlet valve; HV209A, First reflux valve; HV209B, Second reflux valve; HV215A, First normally closed cleaning concentrate outlet valve; HV215B, Second normally closed cleaning concentrate outlet valve;

[0048] FV202A, Electric inlet valve for the first reverse osmosis membrane module; FV202B, Electric inlet valve for the second reverse osmosis membrane module; FV203A, Electric drain valve for the first RO substandard water; FV203B, Electric drain valve for the second RO substandard water; FV204A, Electric drain valve for the first concentrate; FV204B, Electric drain valve for the second concentrate; FV209, Electric flushing valve for pure water;

[0049] PI203A, First reverse osmosis permeate pressure gauge; PI203B, Second reverse osmosis permeate pressure gauge;

[0050] Pure water tank:

[0051] V501, First pure water tank; FV501, Electric inlet valve for first pure water tank; HV512A, Normally open manual outlet valve for first pure water tank;

[0052] V601, Second Pure Water Tank; FV601, Electric Inlet Valve for Second Pure Water Tank; HV612A, Normally Open Manual Outlet Valve for Second Pure Water Tank;

[0053] V701, Third Pure Water Tank; FV701, Electric Inlet Valve for Third Pure Water Tank; HV712A, Normally Open Manual Outlet Valve for Third Pure Water Tank. Detailed Implementation

[0054] To more clearly illustrate the present invention, the invention will be further described below with reference to the accompanying drawings.

[0055] Example 1: As Figure 1-2As shown, a method for extending the service life of reverse osmosis membranes in a medical central water supply system is described. The medical central water supply system includes a pretreatment system, a reverse osmosis system, and a pure water tank.

[0056] Combination Figure 1 As shown, the pretreatment system sequentially includes a first raw water tank V101A and a second raw water tank V101B connected in parallel, a first raw water pump P101A and a second raw water pump P101B connected in parallel, a first mechanical filter F101A, a first activated carbon filter F102A, and a first water softener F103A, each equipped with a multi-way valve, and a first precision filter L101A. A first normally open manual valve HV116 is installed on the main inlet pipe of the first raw water tank V101A and the second raw water tank V101B. A first electric raw water inlet valve FV101A and a second electric raw water inlet valve FV101B are respectively installed on the inlet branch pipes. A connecting pipe with a second normally open manual valve HV101 is provided between the first raw water tank V101A and the second raw water tank V101B. The outlet branch pipes of the first raw water tank V101A and the second raw water tank V101B are respectively equipped with... The system is equipped with a first raw water tank normally open manual outlet valve HV103A and a second raw water tank normally open manual outlet valve HV103B. The inlet branch pipes of the first raw water pump P101A and the second raw water pump P101B are respectively equipped with a first raw water pump normally open manual inlet valve HV105A and a second raw water pump normally open manual inlet valve HV105B. The outlet branch pipes are respectively equipped with a first raw water pump check valve HV106A and a second raw water pump check valve HV106B. The main outlet pipe is equipped with a first raw water pump normally open manual outlet valve HV115A. The inlet pipe of the first precision filter L101A is equipped with a first precision filter normally open inlet valve HV120A. The outlet pipe is equipped with a first pretreated product water conductivity meter CE102A. The system is connected to the reverse osmosis system and is connected to the first raw water tank V101A through a pipeline with a first electric circulation valve FV102A.

[0057] Combination Figure 2As shown, the reverse osmosis system sequentially includes a first high-pressure pump P201A and a first reverse osmosis membrane module M201A. A first pre-treated permeate normally open inlet valve HV203A is installed on the inlet pipe of the first high-pressure pump P201A. A first reverse osmosis membrane module electric inlet valve FV202A is installed on the inlet pipe of the first reverse osmosis membrane module M201A. A first check valve HV206A is installed on the RO permeate outlet pipe of the first reverse osmosis membrane module M201A and connected to a pure water tank. The RO freshwater outlet pipe upstream of the return valve HV206A is equipped with a pipeline with a first RO substandard water electric discharge valve FV203A and is connected to the second raw water tank V101B. The RO concentrate outlet pipe of the first reverse osmosis membrane unit M201A is equipped with a first concentrate electric discharge valve FV204A. The RO concentrate outlet pipe upstream of the first concentrate electric discharge valve FV204A is equipped with a pipeline with a first reflux valve HV209A and is connected to the inlet pipe of the first reverse osmosis membrane unit M201A.

[0058] Combination Figure 5-7 As shown, the number of pure water tanks is one or multiple tanks connected in parallel. The inlet pipe of the pure water tank is equipped with an electric inlet valve and is connected to the RO fresh water outlet pipe of the first reverse osmosis membrane module M201A. The first outlet pipe is connected to the inlet pipe of the first high-pressure pump P201A through a pipeline with a pure water electric flushing valve FV209. The second outlet pipe is connected to the post-treatment water supply system through a pipeline.

[0059] The main inlet pipes of the first raw water tank V101A and the second raw water tank V101B are connected to the inlet pipes of the first raw water pump P101A and the second raw water pump P101B through a pipeline with a normally closed manual inlet valve HV104.

[0060] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0061] S1. Pretreatment procedure: Start the first raw water pump P101A and the second raw water pump P101B → PLC reads the value of the first pretreatment product water conductivity meter CE102A. If it meets the RO inlet water requirements, start the start-up procedure; otherwise, open the first electric circulation valve FV102A. If the standard is not met after more than 5 minutes, the alarm mode is activated, the valve is closed and the pump is stopped.

[0062] S2, Pre-start procedure: Open the electric inlet valve FV202A of the first reverse osmosis membrane module → Open the electric discharge valve FV203A of the first RO unqualified water → Open the electric discharge valve FV204A of the first concentrate → Close the electric circulation valve FV102A.

[0063] S3. Normal water production procedure: After the pre-start procedure runs for 20 seconds, close the first concentrated water electric discharge valve FV204A → after 30 seconds, start the first high-pressure pump P201A → open the electric inlet valve on the pure water tank inlet pipe → close the first RO unqualified water electric discharge valve FV203A.

[0064] S4. Flushing procedure: Open the first concentrated water electric discharge valve FV204A, open the first RO unqualified water electric discharge valve FV203A → open the pure water electric flushing valve FV209 → close the first raw water pump P101A and the second raw water pump P101B → close the electric inlet valve on the pure water tank inlet pipe.

[0065] S5. Shutdown procedure: After the flushing procedure runs for 30 seconds, shut down the first high-pressure pump P201A → shut down the first concentrated water electric discharge valve FV204A → shut down the first RO unqualified water electric discharge valve FV203A → shut down the pure water electric flushing valve FV209.

[0066] Example 2: Based on Example 1, combined with Figure 1-2 As shown, the medical central centralized water supply system also includes a cleaning and disinfection system. The inlet pipe of the first reverse osmosis membrane module M201A is connected to the cleaning and disinfection system through a pipeline with a first normally closed cleaning inlet valve HV217A. The RO freshwater outlet pipe upstream of the first check valve HV206A is connected to the cleaning and disinfection system through a pipeline with a first normally closed cleaning freshwater outlet valve HV208A. The RO concentrate outlet pipe upstream of the first concentrate electric discharge valve FV204A is connected to the cleaning and disinfection system through a pipeline with a first normally closed cleaning concentrate outlet valve HV215A.

[0067] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0068] Cleaning and disinfection procedure: When the first reverse osmosis membrane module M201A needs to be cleaned and disinfected, open the first normally closed cleaning freshwater outlet valve HV208A, the first normally closed cleaning concentrate outlet valve HV215A, and the first normally closed cleaning inlet valve HV217A. The disinfectant flows into the first reverse osmosis membrane module M201A through the first normally closed cleaning inlet valve HV217A, and then returns to the cleaning and disinfection system through the first normally closed cleaning freshwater outlet valve HV208A and the first normally closed cleaning concentrate outlet valve HV215A. After this cycle, the disinfectant is discharged, and the first reverse osmosis membrane module M201A is rinsed with pure water through the flushing procedure.

[0069] Example 3: Based on Example 1 or Example 2, combined with Figure 1As shown, the multi-way valve of the first water softener F103A is connected to the first salt tank V102A through a pipeline. A pipeline filter F104 and a raw water conductivity meter CE101 are installed on the main inlet pipes of the first raw water tank V101A and the second raw water tank V101B. Pressure gauges and sampling ports are installed on the pipelines before and after the first mechanical filter F101A, the first activated carbon filter F102A and the first water softener F103A. An automatic air release valve is installed after the first mechanical filter F101A, the first activated carbon filter F102A and the first water softener F103A.

[0070] Among them, the first raw water pump P101A and the second raw water pump P101B are variable frequency water pumps.

[0071] Combination Figure 1-2 As shown, each water tank, filter, and reverse osmosis membrane module is equipped with a discharge pipe with at least one valve, and multiple pipelines before and after the reverse osmosis membrane module are equipped with check valves.

[0072] Example 4: The difference from Example 1, Example 2, or Example 3 is that it combines... Figure 3-4 As shown, the pretreatment system and the reverse osmosis system include two sets of devices. The pretreatment system also includes a third raw water pump P101C and a fourth raw water pump P101D connected in parallel, a second mechanical filter F101B with a multi-way valve, a second activated carbon filter F102B and a second water softener F103B, and a second precision filter L101B. The reverse osmosis system also includes a second high-pressure pump P201B and a second reverse osmosis membrane module M201B.

[0073] Correspondingly, the inlet branch pipes of the third raw water pump P101C and the fourth raw water pump P101D are respectively equipped with the normally open manual inlet valves HV105C and HV105D of the third raw water pump and the fourth raw water pump, respectively. The outlet branch pipes are respectively equipped with the one-way valves HV106C and HV106D of the third raw water pump and the fourth raw water pump. The main outlet pipe is equipped with the normally open manual outlet valve HV115B of the second raw water pump. The multi-way valve of the second water softener F103B is connected to the second brine tank V102B through a pipeline. The inlet pipe of the second precision filter L101B is equipped with the normally open inlet valve HV120B of the second precision filter. The outlet pipe is equipped with the second pre-treated product water conductivity meter CE102B, which is connected to the reverse osmosis system and connected to the first raw water tank V101A through a pipeline with the second electric circulation valve FV102B.

[0074] Correspondingly, the inlet pipe of the second high-pressure pump P201B is equipped with a second pre-treatment permeate normally open inlet valve HV203B; the inlet pipe of the second reverse osmosis membrane module M201B is equipped with a second reverse osmosis membrane module electric inlet valve FV202B; the RO permeate outlet pipe of the second reverse osmosis membrane module M201B is equipped with a second check valve HV206B and connected to a pure water tank; the RO permeate outlet pipe upstream of the second check valve HV206B is equipped with a pipeline with a second RO unqualified water electric discharge valve FV203B and connected to the second raw water tank V101B; the RO concentrate outlet pipe of the second reverse osmosis membrane module M201B is equipped with a second concentrate electric discharge valve FV204B; the RO concentrate outlet pipe upstream of the second concentrate electric discharge valve FV204B is equipped with a pipeline with a second reflux valve HV209B and connected to the inlet pipe of the second reverse osmosis membrane module M201B.

[0075] The inlet pipe of the second reverse osmosis membrane module M201B is connected to the cleaning and disinfection system through a pipe with a second normally closed cleaning inlet valve HV217B. The RO freshwater outlet pipe upstream of the second check valve HV206B is connected to the cleaning and disinfection system through a pipe with a second normally closed cleaning freshwater outlet valve HV208B. The RO concentrate outlet pipe upstream of the second concentrate electric discharge valve FV204B is connected to the cleaning and disinfection system through a pipe with a second normally closed cleaning concentrate outlet valve HV215B.

[0076] The first reverse osmosis membrane module M201A is equipped with a first reverse osmosis permeate pressure gauge PI203A and a sampling port on its RO permeate outlet pipe, and the second reverse osmosis membrane module M201B is equipped with a second reverse osmosis permeate pressure gauge PI203B and a sampling port on its RO permeate outlet pipe.

[0077] The control logic of the method for extending the service life of reverse osmosis membranes includes:

[0078] Dual water production program: When a single unit of the normal water production program cannot meet the water demand, the second unit is started simultaneously. The initial program is the same as the single unit. When both units are running together, the PLC reads the pressure values ​​of the first reverse osmosis permeate pressure gauge PI203A and the second reverse osmosis permeate pressure gauge PI203B in real time. When the pressure on the permeate side is higher than the set value, the high pressure protection is activated, and the valves are closed and the pumps are stopped in reverse order.

[0079] Example 5: Based on the above examples, combined with... Figure 5-7As shown, there are three pure water tanks: a first pure water tank V501, a second pure water tank V601, and a third pure water tank V701. Electric inlet valves FV501, FV601, and FV701 are respectively installed on the inlet pipes, and are connected to the RO freshwater outlet pipes of the first reverse osmosis membrane unit M201A and the second reverse osmosis membrane unit M201B. A valve for the first pure water tank V501 is installed on the outlet pipe. The normally open manual water outlet valves HV512A (first pure water tank), HV612A (second pure water tank), and HV712A (third pure water tank) are interconnected and connected to the inlet pipes of the first high-pressure pump P201A and the second high-pressure pump P201B via a pipeline with a pure water electric flushing valve FV209. The outlet pipe is connected to the post-treatment water supply system, which supplies water to the terminal water point and then returns it to the pure water tank via a circulation pipeline.

[0080] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. The present invention can be used in similar products. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A method for extending the service life of a reverse osmosis membrane used in a central medical water supply system, characterized by: The medical central centralized water supply system comprises a pretreatment system, a reverse osmosis system and a pure water tank; The pretreatment system comprises a first raw water tank (V101A) and a second raw water tank (V101B) connected in parallel, a first raw water pump (P101A) and a second raw water pump (P101B) connected in parallel, a first mechanical filter (F101A) with a multi-way valve, a first activated carbon filter (F102A) and a first water softener (F103A) with a multi-way valve, and a first precision filter (L101A) in sequence; a first normally open manual valve (HV116) is arranged on the water inlet main pipe of the first raw water tank (V101A) and the second raw water tank (V101B), a first raw water electric water inlet valve (FV101A) and a second raw water electric water inlet valve (FV101B) are arranged on the water inlet branch pipe respectively, a communication pipe with a second normally open manual valve (HV101) is arranged between the first raw water tank (V101A) and the second raw water tank (V101B), a first raw water tank normally open manual water outlet valve (HV103A) and a second raw water tank normally open manual water outlet valve (HV103B) are arranged on the water outlet branch pipe of the first raw water tank (V101A) and the second raw water tank (V101B) respectively, a first raw water pump normally open manual water inlet valve (HV105A) and a second raw water pump normally open manual water inlet valve (HV105B) are arranged on the water inlet branch pipe of the first raw water pump (P101A) and the second raw water pump (P101B) respectively, a first raw water pump check valve (HV106A) and a second raw water pump check valve (HV106B) are arranged on the water outlet branch pipe respectively, a first raw water pump normally open manual water outlet valve (HV115A) is arranged on the water outlet main pipe, a first precision filter normally open water inlet valve (HV120A) is arranged on the water inlet pipe of the first precision filter (L101A), a first pretreatment water production electric conductivity measuring instrument (CE102A) is arranged on the water outlet pipe, and the first precision filter (L101A) is connected with the reverse osmosis system through a pipe with a first electric circulating valve (FV102A) and the first raw water tank (V101A). The reverse osmosis system sequentially comprises a first high-pressure pump (P201A) and a first reverse osmosis membrane group (M201A), a first pretreatment water outlet valve (HV203A) is arranged on the water inlet pipe of the first high-pressure pump (P201A), a first reverse osmosis membrane group electric water inlet valve (FV202A) is arranged on the water inlet pipe of the first reverse osmosis membrane group (M201A), a first check valve (HV206A) is arranged on the RO fresh water outlet pipe of the first reverse osmosis membrane group (M201A) and connected to a pure water tank, a pipe with a first RO unqualified water electric discharge valve (FV203A) is arranged on the RO fresh water outlet pipe in front of the first check valve (HV206A) and connected to a second raw water tank (V101B), a first concentrated water electric discharge valve (FV204A) is arranged on the RO concentrated water outlet pipe of the first reverse osmosis membrane group (M201A), and a pipe with a first backflow valve (HV209A) is arranged on the RO concentrated water outlet pipe in front of the first concentrated water electric discharge valve (FV204A) and connected to the water inlet pipe of the first reverse osmosis membrane group (M201A); The number of pure water tanks is one or multiple in parallel, an electric water inlet valve is arranged on the water inlet pipe of the pure water tank and in communication with the RO fresh water outlet pipe of the first reverse osmosis membrane group (M201A), a first high-pressure pump (P201A) is connected to the first pure water tank through a pipe with a pure water electric flushing valve (FV209), and a second pure water tank is connected to a post-treatment water supply system through a pipe; The control logic of the reverse osmosis membrane service life extension control method comprises: S1, a pretreatment program: starting the first raw water pump (P101A) and the second raw water pump (P101B) → PLC reading the value of the first pretreatment water electric conductivity measuring instrument (CE102A), if the value meets the RO water inlet requirement, starting the start-up program, otherwise, starting the first electric circulating valve (FV102A), if the value does not meet the requirement for more than 5 minutes, starting the alarm mode and stopping the valve and pump; S2, a pre-start-up program: starting the first reverse osmosis membrane group electric water inlet valve (FV202A) → starting the first RO unqualified water electric discharge valve (FV203A) and the first concentrated water electric discharge valve (FV204A) → closing the first electric circulating valve (FV102A); S3, a normal water production program: closing the first concentrated water electric discharge valve (FV204A) after the pre-start-up program runs for 20s → starting the first high-pressure pump (P201A) after 30s → starting the electric water inlet valve on the pure water tank water inlet pipe → closing the first RO unqualified water electric discharge valve (FV203A); S4, a flushing program: starting the first concentrated water electric discharge valve (FV204A) and the first RO unqualified water electric discharge valve (FV203A) → starting the pure water electric flushing valve (FV209) → closing the first raw water pump (P101A) and the second raw water pump (P101B) → closing the electric water inlet valve on the pure water tank water inlet pipe; S5, shutdown program: after the flushing program runs for 30s, the first high-pressure pump (P201A) is closed → the first concentrated water electric discharge valve (FV204A) is closed → the first RO unqualified water electric discharge valve (FV203A) is closed → the pure water electric flushing valve (FV209) is closed.

2. The medical central concentrated water supply system reverse osmosis membrane service life extension control method according to claim 1, characterized in that: The medical central centralized water supply system further comprises a cleaning and disinfecting system, the water inlet pipe of the first reverse osmosis membrane group (M201A) is connected to the cleaning and disinfecting system through a pipeline provided with a first normally closed cleaning water inlet valve (HV217A), the RO fresh water outlet pipe on the front side of the first check valve (HV206A) is connected to the cleaning and disinfecting system through a pipeline provided with a first normally closed cleaning fresh water outlet valve (HV208A), and the RO concentrated water outlet pipe on the front side of the first concentrated water electric discharge valve (FV204A) is connected to the cleaning and disinfecting system through a pipeline provided with a first normally closed cleaning concentrated water outlet valve (HV215A); The control logic of the reverse osmosis membrane service life extension control method comprises: The cleaning and disinfecting program: when the first reverse osmosis membrane group (M201A) needs to be cleaned and disinfected, the first normally closed cleaning fresh water outlet valve (HV208A), the first normally closed cleaning concentrated water outlet valve (HV215A) and the first normally closed cleaning water inlet valve (HV217A) are opened, the disinfectant flows into the first reverse osmosis membrane group (M201A) through the first normally closed cleaning water inlet valve (HV217A), and then returns to the cleaning and disinfecting system through the first normally closed cleaning fresh water outlet valve (HV208A) and the first normally closed cleaning concentrated water outlet valve (HV215A), and after the cycle, the disinfectant is discharged, and the first reverse osmosis membrane group (M201A) is flushed with pure water through the flushing program.

3. The medical central concentrated water supply system reverse osmosis membrane service life extension control method according to claim 2, characterized in that: The multi-way valve of the first water softener (F103A) is connected to the first salt tank (V102A) through a pipeline.

4. The medical central water supply system reverse osmosis membrane life extension control method of claim 1, wherein: A pipeline filter (F104) and a raw water electric conductivity measuring instrument (CE101) are arranged on the water inlet main pipe of the first raw water tank (V101A) and the second raw water tank (V101B).

5. The medical central water supply system reverse osmosis membrane life extension control method according to claim 1, characterized in that: The first raw water pump (P101A) and the second raw water pump (P101B) are variable frequency water pumps.

6. The medical central water supply system reverse osmosis membrane life extension control method according to claim 1, characterized in that: Pressure gauges and sampling ports are arranged on the front and rear pipelines of the first mechanical filter (F101A), the first activated carbon filter (F102A) and the first water softener (F103A).

7. The medical central concentrated water supply system reverse osmosis membrane service life extension control method according to claim 6, characterized in that: Automatic air release valves are arranged behind the first mechanical filter (F101A), the first activated carbon filter (F102A) and the first water softener (F103A).

8. The medical central water supply system reverse osmosis membrane life extension control method of claim 1, wherein: The water inlet main pipes of the first raw water tank (V101A) and the second raw water tank (V101B) are connected to the water inlet pipes of the first raw water pump (P101A) and the second raw water pump (P101B) through a pipeline provided with a normally closed manual water inlet valve (HV104).

9. The method of claim 1-8, wherein the method is characterized by: The pretreatment system and the reverse osmosis system comprise two sets of devices, the pretreatment system further comprises a third raw water pump (P101C) and a fourth raw water pump (P101D) connected in parallel, a second mechanical filter (F101B) provided with a multi-way valve, a second activated carbon filter (F102B) and a second water softener (F103B) respectively, and a second precision filter (L101B), and the reverse osmosis system further comprises a second high-pressure pump (P201B) and a second reverse osmosis membrane group (M201B).

10. The medical central concentrated water supply system reverse osmosis membrane service life extension control method according to claim 9, characterized in that: A first reverse osmosis water production pressure gauge (PI203A) and a sampling port are arranged on the RO fresh water outlet pipe of the first reverse osmosis membrane group (M201A), and a second reverse osmosis water production pressure gauge (PI203B) and a sampling port are arranged on the RO fresh water outlet pipe of the second reverse osmosis membrane group (M201B); The control logic of the reverse osmosis membrane service life extension control method comprises: Double-set water production program: when the single set of devices in the normal water production program cannot meet the water requirement, the second set of devices is started synchronously, the early program is the same as the single set, and the PLC reads the pressure values of the first reverse osmosis water production pressure gauge (PI203A) and the second reverse osmosis water production pressure gauge (PI203B) in real time when the two sets of devices are operated together; when the water production side pressure is higher than the set value, the high-pressure protection is started, and the valves and pumps are stopped in reverse order.

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