Reverse osmosis membrane module offline cleaning system

Abstract

The utility model relates to the technical field of permeation membrane offline cleaning equipment, solves the problem that reverse osmosis module is not cleaned completely and cleaning efficiency is reduced in the prior art, especially relates to a kind of reverse osmosis membrane group offline cleaning system, comprising: cleaning agent storage tank, for storing cleaning agent;Filter, one end is communicated with cleaning agent storage tank, and the other end is connected with reverse osmosis membrane group through import pipeline, for filtering the impurity in cleaning agent;Reverse osmosis membrane group includes several parallelly arranged reverse osmosis membrane elements;Air washing component is connected with reverse osmosis membrane group through gas source pipeline, for air washing membrane group;Flushing component is connected with reverse osmosis membrane group through flushing pipeline, for flushing to remove the cleaning agent remaining in membrane group. It is made by pry dress type assembly, realizes chemical cleaning agent, water flushing, air washing in one, greatly improves the reverse osmosis membrane group cleaning effect.

Description

Technical Field

[0001] This utility model relates to the technical field of offline cleaning equipment for reverse osmosis membranes, and in particular to an offline cleaning system for reverse osmosis membrane modules. Background Technology

[0002] The original online reverse osmosis membrane modules for wastewater treatment operated with multiple membrane modules connected in series. After a period of operation, the membrane elements in the modules became fouled, resulting in decreased permeability and an increased pressure difference between the inlet and outlet of the reverse osmosis unit, affecting the reverse osmosis permeate output. Furthermore, normal online cleaning of the reverse osmosis membrane modules was not ideal, as the multiple modules connected in series made it easy for contaminants to accumulate in the last-stage membrane elements, leading to incomplete cleaning and affecting the stable operation of the reverse osmosis unit. Utility Model Content

[0003] The purpose of this invention is to provide an offline cleaning system for reverse osmosis membrane modules, which solves the problems of incomplete cleaning and reduced cleaning efficiency of reverse osmosis modules in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides an offline cleaning system for reverse osmosis membrane modules, comprising:

[0006] Cleaning agent storage tank, used to store cleaning agents;

[0007] A filter is provided, one end of which is connected to the cleaning agent storage tank, and the other end of which is connected to a reverse osmosis membrane module through an inlet pipe. The filter is used to filter impurities in the cleaning agent. The reverse osmosis membrane module includes several reverse osmosis membrane elements arranged in parallel.

[0008] An air scrubbing assembly is connected to the reverse osmosis membrane module via an air source pipeline and is used for air scrubbing the membrane module.

[0009] A flushing assembly, which is connected to the reverse osmosis membrane module via a flushing pipe, is used to flush and remove residual cleaning agent from the membrane module.

[0010] Furthermore, a chemical cleaning pump is provided between the cleaning agent storage tank and the filter, the chemical cleaning pump being used to pump the cleaning agent into the filter.

[0011] Furthermore, the top of the cleaning agent storage tank is provided with a dosing port for adding cleaning agent; the bottom of the cleaning agent storage tank is provided with a drain port for emptying the liquid inside the tank.

[0012] Furthermore, a first local pressure gauge is connected to the upper end of the filter, and a second local pressure gauge is connected to the lower end of the filter. The first local pressure gauge and the second local pressure gauge are connected by a differential pressure gauge, which is used to monitor the pressure difference before and after the filter element in the filter.

[0013] Furthermore, a third local pressure gauge is provided at the top of the filter, and an exhaust port is connected to the third local pressure gauge. The third local pressure gauge is interlocked with the exhaust port.

[0014] Furthermore, the filter is provided with a drain port for discharging trapped impurities or deposits.

[0015] Furthermore, a first ball valve is installed on the inlet pipe to control the flow of fluid in the inlet pipe; an inlet pressure gauge is installed downstream of the first ball valve to monitor the fluid pressure in the inlet pipe.

[0016] Furthermore, the inlet pipe is equipped with a forward wash inlet valve and a backwash inlet valve, which are used to control the flow direction of the fluid to achieve forward and reverse cleaning of the reverse osmosis membrane module.

[0017] Furthermore, the concentrate outlet of the reverse osmosis membrane module is connected to the cleaning agent circulation inlet on the cleaning agent storage tank through an outlet pipe, forming a closed-loop cleaning circuit.

[0018] Furthermore, the outlet pipe is equipped with a forward wash outlet valve and a backwash outlet valve, the forward wash outlet valve being interlocked with the forward wash inlet valve, and the backwash outlet valve being interlocked with the backwash inlet valve.

[0019] Furthermore, an outlet pressure gauge is installed on the outlet pipe to monitor the fluid pressure on the outlet pipe.

[0020] Furthermore, the permeate outlet of the reverse osmosis membrane module is connected to the water circulation inlet on the cleaning agent storage tank via a permeate pipe, forming a permeate circulation loop.

[0021] Furthermore, the gas washing pipeline is provided with branch gas paths that are independently connected to each of the reverse osmosis membrane elements, and pneumatic control valves are provided on the branch gas paths to independently control the gas washing on / off of the corresponding membrane elements.

[0022] Furthermore, the flushing pipeline is sequentially equipped with a pre-pump ball valve, a water pump, a check valve, and a post-pump ball valve. The pre-pump ball valve is used to control the flow of flushing water and regulate the inlet flow rate; the water pump is used to provide flushing power; the check valve is used to prevent backflow of water; and the post-pump ball valve is interlocked with the water pump.

[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0024] This utility model discloses an offline cleaning system for reverse osmosis membrane modules. By integrating a cleaning agent storage tank, a filter, an air washing component, and a flushing component, it achieves multi-functional integrated cleaning of reverse osmosis membrane modules, including chemical cleaning, air washing, and physical flushing, significantly improving cleaning efficiency.

[0025] Taking advantage of the structural characteristics of multiple parallel membrane elements in a reverse osmosis membrane module, each membrane element can be independently connected to the cleaning circuit, allowing for differentiated cleaning of membrane elements with different degrees of fouling. Furthermore, with the parallel design, the path length of the cleaning liquid or gas flow through each membrane element is short, the resistance is low (pressure drop is dispersed), the system energy consumption is lower, and the cleaning agent flow rate is more uniform, avoiding local high pressure damage to the membrane surface.

[0026] The air washing unit is directly connected to the membrane module through an air source pipeline, enabling efficient air washing before / after chemical cleaning, enhancing the removal of pollutants and overcoming the limitations of traditional pure liquid cleaning for stubborn dirt.

[0027] The flushing unit thoroughly removes residual cleaning agent from the membrane module through the flushing pipe, avoiding the negative impact of chemical residues on subsequent operation. Attached Figure Description

[0028] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0029] Figure 1 This is a plan view of an offline cleaning system for reverse osmosis membrane modules provided by this utility model;

[0030] Figure 2 This is a plan view of the filter provided by this utility model;

[0031] Figure 3 This is a planar diagram of the reverse osmosis membrane module provided by this utility model;

[0032] The reference numerals in the attached figures are explained as follows:

[0033] 1. Cleaning agent storage tank; 101. Dosing port; 102. Discharge port; 103. Cleaning agent circulation inlet; 104. Water circulation inlet;

[0034] 2. Filter; 201. First local pressure gauge; 202. Second local pressure gauge; 203. Differential pressure gauge; 204. Third local pressure gauge; 205. Drain outlet; 206. Exhaust outlet;

[0035] 3. Inlet pipe; 301. First ball valve; 302. Inlet pressure gauge; 303. Forward wash inlet valve; 304. Backwash inlet valve;

[0036] 4. Reverse osmosis membrane module; 401. Reverse osmosis membrane element; 402. Concentrate outlet; 403. Product water outlet;

[0037] 5. Airflow assembly;

[0038] 6. Gas source pipeline; 60. Branch gas line; 601. Pneumatic control valve;

[0039] 7. Rinsing components;

[0040] 8. Flushing pipeline; 801. Ball valve before pump; 802. Water pump; 803. Check valve; 804. Ball valve after pump;

[0041] 9. Chemical cleaning pump;

[0042] 10. Outlet pipe; 1001. Forward wash outlet valve; 1002. Backwash outlet valve; 1003. Outlet pressure gauge;

[0043] 11. Water production pipeline. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] See Figures 1 to 3 This utility model discloses a highly efficient and modular offline cleaning system for reverse osmosis membrane modules. The system includes a cleaning agent storage tank 1, a filter 2, an air washing component 5, and a flushing component 7. All components work together through an optimized piping system to achieve deep cleaning and maintenance of the reverse osmosis membrane modules.

[0046] Specifically, the cleaning agent storage tank 1 is used to store the cleaning agent. The tank is equipped with a dosing port 101 for easy addition and replacement of the cleaning agent, and also has a drain port 102 at the bottom to facilitate the complete emptying of residual liquid in the tank and ensure that cross-contamination of the cleaning agent does not occur between different batches of cleaning operations.

[0047] Filter 2, as a key device for purifying the cleaning agent, is connected at its inlet to the cleaning agent storage tank 1 and at its outlet to the inlet of the reverse osmosis membrane module 4 via inlet pipe 3. This filter can effectively intercept particulate matter, suspended solids, and other impurities that may be present in the cleaning agent, thereby preventing impurities from entering the membrane module and causing secondary pollution.

[0048] To further ensure filtration effectiveness, filter 2 is also equipped with a multi-stage pressure monitoring system consisting of a first local pressure gauge 201, a second local pressure gauge 202, and a differential pressure gauge 203. This system can monitor the pressure difference before and after the filter element in real time, providing accurate information for filter element replacement. Additionally, a drain port 205 is located at the bottom of filter 2 to facilitate the periodic removal of deposited impurities, ensuring the long-term stable operation of the filtration system.

[0049] In addition, a third local pressure gauge 204 is installed at the top of filter 2, forming a comprehensive pressure monitoring network together with the first local pressure gauge 201 and the second local pressure gauge 202. The third local pressure gauge 204 is connected to an exhaust port 206. This local pressure gauge and the exhaust port 206 operate interlocked. The pressure gauge is used to monitor the internal pressure of the filter in real time. When the pressure gauge detects that the pressure value inside the filter exceeds a preset safety threshold, the exhaust port 206 can be opened to release pressure appropriately to avoid affecting the normal operation of the filter, thereby adjusting the pressure inside the entire filter to a balanced state and preventing equipment damage or decreased filtration efficiency due to excessive pressure. Furthermore, this interlock design also prevents air resistance from affecting the normal flow of fluid, ensuring the continuity and stability of the filtration process.

[0050] A chemical cleaning pump 9 is installed between the cleaning agent storage tank 1 and the filter 2, which can reliably pump the cleaning agent from the storage tank into the subsequent filtration system. The flow rate and pressure parameters of the chemical cleaning pump 9 can be adjusted according to actual cleaning needs to ensure that the cleaning agent enters the filtration stage under optimal operating conditions.

[0051] A first ball valve 301 is installed on the aforementioned inlet pipe 3 to control the flow of fluid on the inlet pipe 3; an inlet pressure gauge 302 is installed downstream of the first ball valve 301 to monitor the fluid pressure on the inlet pipe 3 in real time and provide important pressure parameter references for the cleaning process.

[0052] The inlet pipe 3 is also equipped with a forward wash inlet valve 303 and a backwash inlet valve 304. The forward wash inlet valve 303 opens during forward cleaning, allowing the cleaning agent to flow in the normal operating direction of the membrane element. The backwash inlet valve 304 opens during reverse cleaning, enabling the cleaning agent to flow in the reverse direction. The two valves are interlocked to ensure that only one valve is open at any given time, preventing flow confusion. This bidirectional valve configuration allows the system to flexibly select between forward and reverse cleaning modes based on the membrane fouling level, significantly improving the cleaning effect.

[0053] For the reverse osmosis membrane module 4, in this example, the reverse osmosis membrane module 4 includes several reverse osmosis membrane elements 401 arranged in parallel. This allows the failure of a single membrane element to be isolated by a valve, and enables differentiated cleaning of groups. Membrane elements with severe fouling can be cleaned more thoroughly individually to avoid "over-cleaning" or "under-cleaning" and to ensure the normal operation of other membrane elements.

[0054] In this example, the reverse osmosis membrane module 4 connects to two fluid circulation systems, employing a dual-loop design to achieve efficient closed-loop operation of the cleaning process. Specifically, in terms of concentrate circulation, the concentrate outlet 402 of the reverse osmosis membrane module 4 is connected to the cleaning agent circulation inlet 103 on the cleaning agent storage tank 1 via the outlet pipe 10, forming a closed-loop cleaning circuit. In terms of permeate circulation, the permeate outlet 403 of the reverse osmosis membrane module 4 is connected to the permeate circulation inlet 104 on the cleaning agent storage tank 1 via the permeate pipe 11, forming a permeate circulation circuit.

[0055] The outlet pipe 10 is equipped with a forward wash outlet valve 1001 and a backwash outlet valve 1002. The forward wash outlet valve 1001 is interlocked with the aforementioned forward wash inlet valve 303, and the backwash outlet valve 1002 is interlocked with the aforementioned backwash inlet valve 304, which improves the safety and reliability of the cleaning process and achieves precise control of the cleaning process. An outlet pressure gauge 1003 is also installed on the outlet pipe 10 to monitor the fluid pressure on the outlet pipe in real time, working in conjunction with the aforementioned inlet pressure gauge 302.

[0056] The air-washing module 5 is connected to the reverse osmosis membrane module 4 via the air source pipe 6 for air-washing the membrane module. The air-washing module 5 is designed to increase membrane flux, remove impurities and fouling from the membrane surface and pores, and restore membrane permeability to ensure stable system operation. Furthermore, regular air washing reduces fouling accumulation on the membrane surface, prevents pore blockage, extends membrane lifespan, and reduces replacement frequency and maintenance costs. After removing contaminants from the membrane surface, air washing reduces negative impacts on water quality, ensuring pure and stable product water quality.

[0057] More specifically, the gas source pipeline 6 is equipped with branch gas lines 60 that are independently connected to each reverse osmosis membrane element 401 in the reverse osmosis membrane module 4. Each branch gas line 60 is equipped with a pneumatic control valve 601 for independently controlling the gas washing on / off of the corresponding membrane element. By controlling the opening and closing of each pneumatic control valve 601, precise gas washing control of the corresponding membrane element can be achieved. This allows for enhanced cleaning of heavily fouled membrane elements, as well as gentle cleaning of slightly fouled membrane elements, avoiding resource waste or insufficient cleaning caused by a "one-size-fits-all" approach to cleaning.

[0058] For the flushing component 7, it is connected to the reverse osmosis membrane module 4 via the flushing pipe 8, and is used to flush and remove residual cleaning agent from the membrane module. The flushing pipe 8 is sequentially equipped with a pre-pump ball valve 801, a water pump 802, a check valve 803, and a post-pump ball valve 804. These components work together to ensure the reliability of the flushing process. The pre-pump ball valve 801 controls the flow of flushing water and regulates the inlet flow rate; the water pump 802 provides flushing power; the check valve 803 prevents backflow; and the post-pump ball valve 804 is interlocked with the water pump 802 to ensure correct start-up and shutdown sequence and prevent water hammer.

[0059] In actual cleaning operations, the reverse osmosis membrane is first flushed with water for 15-30 minutes; then, a high-flow-rate flush is performed, at 1.5-2 times the normal operating flow rate, for 30-60 minutes. The membrane is then circulated through the reverse osmosis membrane module 4 via chemical cleaning pump 9, maintaining a certain flow rate and pressure. The circulation time is determined based on the degree of fouling of the membrane elements and the cleaning requirements, typically requiring several hours to overnight.

[0060] Next, stop the cleaning pump 9 and allow the membrane elements to be completely immersed in the cleaning solution. The immersion time depends on the stubbornness of the contaminants and may range from several hours to overnight. Immersion allows the cleaning agent to fully penetrate every corner of the reverse osmosis membrane, ensuring uniform distribution and effective action. Furthermore, immersion helps improve the solubility and reaction rate of the cleaning agent, making contaminants easier to remove.

[0061] After cleaning, thoroughly rinse the membrane elements with pure water or reverse osmosis permeate to remove residual cleaning agent and dirt. During rinsing, observe the pressure gauge readings at the inlet and outlet of the membrane module to see if the pressure difference between the membrane modules decreases significantly. Once the pressure difference drops to a reasonable range, rinsing can be stopped, and the membrane elements can be air-dried for later use.

[0062] In summary, the offline cleaning device for reverse osmosis membrane modules disclosed in this utility model solves the problems of incomplete and poor-performing online cleaning of reverse osmosis membrane modules. By adopting a parallel installation method for the membrane modules, cleaning can be more thorough, and it solves the problem of contaminant deposition in the final membrane element due to multiple membrane modules connected in series, leading to incomplete cleaning and affecting the stable operation of the reverse osmosis unit. After cleaning, the water permeability and desalination rate are improved, and the membrane pressure differential can be controlled within a reasonable range, greatly extending the service life of the membrane modules. The skid-mounted assembly integrates chemical cleaning agents, water flushing, and air washing, significantly improving the cleaning effect of the reverse osmosis membrane modules.

[0063] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. An offline cleaning system for reverse osmosis membrane modules, characterized in that, include: Cleaning agent storage tank (1), used to store cleaning agent; A filter (2) is connected at one end to the cleaning agent storage tank (1) and at the other end to the reverse osmosis membrane module (4) via an inlet pipe (3). The filter (2) is used to filter impurities in the cleaning agent. The reverse osmosis membrane module (4) includes several reverse osmosis membrane elements (401) arranged in parallel. A forward wash inlet valve (303) and a backwash inlet valve (304) are provided on the inlet pipe (3). The forward wash inlet valve (303) and the backwash inlet valve (304) are used to control the flow direction of the fluid to achieve forward and reverse cleaning of the reverse osmosis membrane module (4). The product water outlet (403) of the reverse osmosis membrane module (4) is connected to the water circulation inlet (104) opened on the cleaning agent storage tank (1) via a product water pipe (11) to form a product water circulation loop. Air washing assembly (5), which is connected to the reverse osmosis membrane group (4) through an air source pipe (6) and is used for air washing the membrane group; The flushing assembly (7) is connected to the reverse osmosis membrane module (4) via a flushing pipe (8) and is used to flush and remove residual cleaning agent in the membrane module.

2. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, A chemical cleaning pump (9) is provided between the cleaning agent storage tank (1) and the filter (2), and the chemical cleaning pump (9) is used to pump the cleaning agent into the filter (2).

3. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, The cleaning agent storage tank (1) has a dosing port (101) at the top for adding cleaning agent; the cleaning agent storage tank (1) has a discharge port (102) at the bottom for emptying the liquid in the storage tank.

4. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, The filter (2) is connected to a first local pressure gauge (201) at its upper end and to a second local pressure gauge (202) at its lower end. The first local pressure gauge (201) and the second local pressure gauge (202) are connected by a differential pressure gauge (203). The differential pressure gauge (203) is used to monitor the pressure difference before and after the filter element in the filter (2).

5. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, A first ball valve (301) is provided on the inlet pipe (3) to control the flow of fluid on the inlet pipe (3); an inlet pressure gauge (302) is provided downstream of the first ball valve (301) to monitor the fluid pressure on the inlet pipe (3).

6. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, The concentrate outlet (402) of the reverse osmosis membrane module (4) is connected to the cleaning agent circulation inlet (103) on the cleaning agent storage tank (1) through the outlet pipe (10) to form a closed-loop cleaning circuit.

7. The offline cleaning system for a reverse osmosis membrane module according to claim 6, characterized in that, The outlet pipe (10) is equipped with a forward wash outlet valve (1001) and a backwash outlet valve (1002). The forward wash outlet valve (1001) is interlocked with the forward wash inlet valve (303), and the backwash outlet valve (1002) is interlocked with the backwash inlet valve (304).

8. The offline cleaning system for a reverse osmosis membrane module according to claim 1, characterized in that, The gas source pipeline (6) is provided with a branch gas path (60) that is independently connected to each of the reverse osmosis membrane elements (401). The branch gas path (60) is provided with a pneumatic control valve (601) for independently controlling the gas washing on / off of the corresponding membrane element.

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