CN115784379A - Membrane circulation system of uniform water distribution - Google Patents

Abstract

The invention discloses a membrane circulating system for uniformly distributing water, wherein a mixer is respectively communicated with a mixed water outlet pipeline and a plurality of high-pressure water inlet pipelines along two sides in the same radial direction, the water inlet end of the mixed water outlet pipeline is communicated with one end of the mixer, the water outlet end of the mixed water outlet pipeline is connected with a plurality of water outlet branches in parallel, each water outlet branch is respectively provided with a reverse osmosis filter in a matched mode, the water inlet end of the high-pressure water inlet pipeline is communicated with a raw water tank, the water outlet end of the high-pressure water inlet pipeline is communicated with the mixer at equal intervals along the axial direction of the mixer, the mixer is also communicated with a plurality of concentrated water return pipelines, the water inlet end of each concentrated water return pipeline is in bypass mode on a concentrated water outlet pipeline of the reverse osmosis filter, the water outlet ends of the concentrated water outlet pipelines are communicated with the mixer and are in one-to one correspondence with the water outlet ends of the high-pressure water inlet pipelines along the axial direction of the mixer, the approach of treatment load of each membrane circuit is realized, the stability and the treatment capability of a membrane device is ensured, the membrane fouling is delayed, the cleaning frequency is reduced, and the service life of a membrane module is prolonged.

Description

A membrane circulation system with uniform water distribution

technical field

The invention relates to the technical field of reverse osmosis filtration, in particular to a membrane circulation system for uniform water distribution.

Background technique

Reverse osmosis systems have been widely used to effectively remove inorganic and organic impurities, as well as bacteria and viruses in tap water. When the reverse osmosis water purifier is not working, the salt concentration of the concentrated water side is 20-100 times higher than that of the produced water side. Under the action of osmotic pressure, the salt will penetrate into the produced water through the membrane pores side, leading to an increase in the salt concentration of the permeate side. Furthermore, part of the concentrated water needs to be returned to the water inlet side. However, in the prior art, the water quality of the multi-circuit concentrated water and the main water inlet is not uniform, resulting in different operating pressures and different water production rates of each concentrated water circuit, thereby reducing the cost of the overall device. service life and processing capacity. The patent document CN109467207A discloses a reverse osmosis backwashing system. A waste water drainage pipe is arranged on the fourth connecting pipe between the first water outlet of the reverse osmosis main engine and the third valve, and a fifth valve is installed on the waste water drainage pipe to store water. The fourth water outlet of the tank is connected with the water inlet of the water pump through the fifth connecting pipe, and the fourth valve is installed on the fifth connecting pipe, which will inevitably affect the water production efficiency and increase the burden on the water inlet pipe, affecting The service life of the overall reverse osmosis system.

Contents of the invention

The purpose of the present invention is to provide a membrane circulation system with uniform water distribution to solve the above-mentioned problems in the prior art, to achieve uniform water quality in each water outlet branch, consistent operating pressure, and close water production rate to ensure water production efficiency. , and improve the service life and operation stability of the membrane device, reducing operation and maintenance costs.

In order to achieve the above object, the present invention provides the following scheme: the present invention provides a membrane circulation system for uniform water distribution, including a mixer for uniformly mixing concentrated water circulating water and high-pressure feed water. There are mixed water outlet pipes and a number of high-pressure water inlet pipes respectively connected to both sides of the water outlet pipe, the water inlet end of the mixed water outlet pipe is connected to one end of the mixer, and a number of water outlet branches are connected in parallel at the water outlet end, each of the water outlet The branches are all equipped with circulating pumps for pumping the mixed water out of the mixer, and each of the water outlet branches is equipped with a reverse osmosis filter respectively. The axial direction of the mixer is connected with the mixer at equal intervals, and the mixer is also connected with a number of concentrated water return pipes, and the water inlet end of the concentrated water return pipe bypasses the concentrated water in the reverse osmosis filter. On the water outlet pipe, the water outlet ends are all connected to the mixer, and correspond to the water outlet ends of the high-pressure water inlet pipes along the axial direction of the mixer, and the water outlet of the concentrated water return pipe The end communicates at a position between the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer.

Preferably, the water outlet end of the concentrated water return pipe is equally spaced from the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer.

Preferably, the mixer is provided with a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe, and the radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe.

Preferably, a pipeline mixer is provided on the mixed water outlet pipeline.

Preferably, the concentrated water return pipeline is also provided with a regulating valve for dynamically adjusting the return flow of concentrated water, and the regulating valve is equipped with a flow meter for measuring the return flow of concentrated water.

Preferably, the raw water tank is equipped with a water outlet main road, and several high-pressure water inlet pipes are connected in parallel between the water outlet main road and the mixer, and the water outlet main road is connected in series with two A centrifugal pump for pressurization, the centrifugal pump on the water outlet side is located within the lift of the centrifugal pump on the water inlet side.

Preferably, the water outlet main road is also provided with a bag filter and a scale inhibitor for sequentially filtering the incoming water, and the bag filter and the scale inhibitor are connected to the inlet of the centrifugal pump on the water inlet side. water end.

Preferably, the scale inhibitor includes a communication tank connected to the high-pressure water inlet pipeline, and the communication tank is provided with an inlet for online dosing of scale inhibitor.

Preferably, the mixer is equipped with a cleaning pipeline for backwashing, and the cleaning pipeline is provided with a cleaning water tank connected with the water outlet of the reverse osmosis filter, and a cleaning water tank connected with the water outlet of the cleaning water tank. A filter, the water outlet end of the cleaning filter is connected with a cleaning water pump, the cleaning water pump is connected with the concentrated water outlet pipeline, and the cleaning water outlet pipeline is bypassed on the water outlet main road.

Preferably, each of the water outlet branches is provided with a pressure gauge.

Compared with the prior art, the present invention has achieved the following technical effects:

First, firstly, in the process of use, the mixed water outlet pipe and several high-pressure water inlet pipes are connected on both sides of the mixer along the same radial direction, so that the high-pressure water inlet pipe and the concentrated water return pipe are preliminarily carried out in the mixer. After spraying and mixing, rely on the kinetic energy of the water in the high-pressure water inlet pipe to quickly flow to the other side of the mixer, that is, to the mixed water outlet pipe on the other side for water outlet, and then flow to the reverse osmosis filter for filtration. Because the flow rate of the water in the high-pressure water inlet pipe is too fast, it will flow into the mixed water outlet pipe quickly after staying in the mixer for a short time, so that the concentrated water return pipe corresponds to each high-pressure water inlet pipe one by one, so that the high-pressure Influent water and concentrated water return water are treated separately to form multiple sets of high-pressure water inflow and concentrated water return water in the working state of spraying, ensuring that the high-pressure influent water and concentrated water effluent are fully mixed before flowing into the mixed water outlet pipe, then after passing When each reverse osmosis filter is producing water, the workload of each reverse osmosis filter is roughly the same, so as to avoid the different proportion of concentrated water in each water outlet branch, which will cause the work of each reverse osmosis filter to be unbalanced, that is, to avoid causing The processing capacity of each reverse osmosis filter is too large or too small, which affects the service life of the reverse osmosis filter. Furthermore, by setting up a mixer, the mixed water is completed at the outlet end of the high-pressure water inlet pipe and the concentrated water return pipe. Avoid the prior art where the return water of concentrated water is led to the high-pressure water inlet pipeline, so that the raw water and concentrated water are pumped into the osmosis filter together through the water inlet pump each time, and the amount of pumping each time is controlled by the water inlet pump. Due to the limitation, the work efficiency is low, and then the mixed water is completed in the mixer, so that the flow rate of the high-pressure water inlet pipe and the concentrated water return pipe is not affected, and the treatment efficiency of the raw water is guaranteed.

Second, the distance between the outlet end of the concentrated water return pipe and the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer is equal, so that the raw water and the concentrated water can be opposed at right angles, which can ensure the full mixing of the raw water and the concentrated water. It can also reduce the loss of kinetic energy of high-pressure raw water, avoiding the outlet end of the concentrated water return pipeline close to the outlet end of the high-pressure water inlet pipeline, which will have a large impact on the kinetic energy of the high-pressure inlet water, and at the same time avoid the outlet end of the concentrated water return pipeline close to the mixing The water inlet end of the water outlet pipe causes concentrated water and raw water to flow into the mixed water outlet pipe before they can be mixed in the mixer, resulting in uneven mixing of raw water and concentrated water, making the concentration of the mixed water too high or too low.

Third, the mixer is provided with a high-pressure water inlet connected to the outlet end of the high-pressure water inlet pipe. The radial width of the high-pressure water inlet extends along the direction of the arrangement of the concentrated water return pipe, so that the high-pressure raw water flowing out of the high-pressure water inlet The spraying range is as large as possible to ensure the mixing effect with concentrated water in the mixer.

Fourth, there is a pipeline mixer on the outlet pipeline of the mixed water. By setting the pipeline mixer, the effect of secondary mixing of raw water and concentrated water is formed, which further ensures the uniformity of mixing of raw water and concentrated water.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Among them, 1-Water outlet, 2-Cleaning water outlet pipe, 3-Inlet flowmeter, 4-Bag filter, 5-Bag filter outlet, 6-Scale inhibitor, 7-First centrifugal pump, 8- First centrifugal pump outlet, 9-second centrifugal pump, 10-second centrifugal pump outlet, 11-pipeline mixer, 12-circulation pump, 13-water outlet branch, 14-site microcomputer control system, 15-base, 16 -concentrated water discharge pipe, 17-flow meter, 18-regulating valve, 19-concentrated water outlet pipe, 20-cleaning water pump, 21-cleaning pipe, 22-cleaning filter, 23-cleaning water tank, 24-concentrated water return Water pipeline, 25-mixer.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a membrane circulation system with uniform water distribution to solve the problems of the above-mentioned prior art, realize uniform water quality of each circuit, consistent operating pressure, close water production rate, ensure water production efficiency, and Improve the service life and operation stability of the membrane device, and reduce operation and maintenance costs.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 1, the present embodiment provides a membrane circulation system for evenly distributing water, including a mixer 25 for evenly mixing concentrated water circulating water and high-pressure feed water, preferably, the mixer 25 is in a straight tubular structure, and adopts Made of high-pressure resistant materials and structures, its cross-section is slightly larger than the high-pressure water inlet pipe and concentrated water return pipe 24, which can not only meet the high-pressure water inlet and concentrated water return water spraying, but also avoid high-pressure water inlet and concentrated water return. For the loss of water circulation pressure, the mixer 25 is connected with a mixed water outlet pipe and a number of high-pressure water inlet pipes on both sides along the same radial direction. The water inlet end of the mixed water outlet pipe is connected to one end of the mixer 25, and the water outlet end Several water outlet branches 13 are connected in parallel, and each water outlet branch 13 is equipped with a circulating pump 12 that pumps the mixed water out of the mixer 25. By setting the circulating pump 12, the water output of the mixed water per unit time is adjusted, and then it is suitable for reverse osmosis filtration. The amount of mixed water required by the device; and each water outlet branch 13 is equipped with a reverse osmosis filter respectively, and the water inlet end of the high-pressure water inlet pipeline is connected with the raw water tank, and its water outlet is equidistant from the mixer 25 along the axial direction of the mixer 25 The mixer 25 is also connected with some concentrated water return pipes 24, and the water inlet end of the concentrated water return pipe 24 is bypassed on the concentrated water outlet pipe 19 of the reverse osmosis filter, and its water outlet is connected to the mixer 25 They are in communication with each other, and correspond to the water outlets of the high-pressure water inlet pipes along the axial direction of the mixer 25, and the water outlets of the concentrated water return pipe 24 are connected to the high-pressure water inlet pipes and the mixed water outlet along the circumference of the mixer 25. between the pipes. Each water outlet branch 13 is respectively connected with the corresponding reverse osmosis filter. After the high-pressure feed water and concentrated water return water are mixed, they enter the reverse osmosis filter through the mixed water outlet pipe. After membrane filtration, the produced water is metered back Concentrated water is used for metering discharge, specifically by setting the concentrated water outlet pipeline 19 for discharge, and preferably the concentrated water outlet pipeline 19 is also connected with the concentrated water discharge pipe 16, so as to discharge the concentrated water that has not been utilized through the concentrated water return pipeline 24 .

First, in the process of use, the mixed water outlet pipe and several high-pressure water inlet pipes are connected to both sides of the mixer 25 along the same radial direction, so that the high-pressure water inlet pipe and the concentrated water return pipe 24 are preliminarily processed in the mixer 25. After spraying and mixing, rely on the kinetic energy of the water in the high-pressure water inlet pipe to quickly flow to the other side of the mixer 25, that is, to the mixed water outlet pipe on the other side for water outlet, and then flow to the reverse osmosis filter for filtration , because the flow rate of the water in the high-pressure water inlet pipeline is too fast, after a short stay and mixing in the mixer 25, it quickly flows into the mixed water outlet pipeline, so that the concentrated water return pipeline 24 is in one-to-one correspondence with each high-pressure water inlet pipeline, The high-pressure inlet water and the concentrated water return water are separated and treated to form multiple sets of high-pressure water inlet and concentrated water return water spraying working conditions to ensure that the high-pressure inlet water and concentrated water outlet water are fully mixed and then flow into the mixed water outlet pipe. Then, when the water is produced through each reverse osmosis filter, the workload of each reverse osmosis filter is roughly the same, so as to avoid the unevenness of the work of each reverse osmosis filter due to the different proportion of concentrated water in each water outlet branch 13 , that is to avoid causing the processing capacity of each reverse osmosis filter to be too large or too small, which will affect the service life of the reverse osmosis filter. Moreover, by setting the mixer 25, the mixed water will be mixed in the high-pressure water inlet pipe and the concentrated water return pipe. 24, the water outlet end is completed, avoiding the prior art, the concentrated water return water is conducted to the high-pressure water inlet pipeline, so that the raw water and the concentrated water are pumped into the hair permeation filter through the water inlet pump each time, and each time the pump The amount of input is limited by the water inlet pump, resulting in low work efficiency, and then the mixed water is completed in the mixer 25, so that the flow rate of the high-pressure water inlet pipe and the concentrated water return pipe 24 is not affected, ensuring the treatment efficiency of raw water .

Among them, the water outlet end of the concentrated water return pipe 24 is equally spaced from the high-pressure water inlet pipe and the mixed water outlet pipe along the circumference of the mixer 25, so that the raw water and the concentrated water can be opposed at right angles, which can ensure the full mixing of the raw water and the concentrated water , and can reduce the loss of kinetic energy of the high-pressure raw water, avoiding the water outlet end of the concentrated water return pipe 24 close to the water outlet end of the high-pressure water inlet pipe, which has an excessive impact on the kinetic energy of the high-pressure water inlet, and at the same time avoiding the water outlet of the concentrated water return pipe 24 end is close to the water inlet end of the mixed water outlet pipe, causing the concentrated water and raw water to flow into the mixed water outlet pipe before they can be mixed in the mixer 25, resulting in uneven mixing of the raw water and concentrated water, making the concentration of the mixed water too high or too low.

Further, the mixer 25 is provided with a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipe, and the radial width of the high-pressure water inlet extends along the arrangement direction of the concentrated water return pipe 24, so that the high-pressure water inlet flows out The injection range of the high-pressure raw water is as large as possible to ensure the mixing effect with the concentrated water in the mixer 25 .

Moreover, a pipeline mixer 11 is provided on the outlet pipeline of the mixed water, and the secondary mixing effect of raw water and concentrated water is formed by arranging the pipeline mixer 11, which further ensures the uniformity of mixing of raw water and concentrated water. Preferably, the pipeline mixer 11 is made of glass fiber reinforced plastic, which has the advantages of convenient processing, durability and corrosion resistance. It is generally composed of pipes and nozzles, vortex chambers, perforated plates or special-shaped plates, etc. to promote mixing. Generally, three pipes are used together as a unit (the number of sections can also be increased according to the performance of the mixed medium). There are three mixing methods, namely nozzle type, vortex type, perforated plate, special-shaped plate type. When the raw water and the concentrated water pass through the pipe mixer 11, the raw water and the concentrated water are mixed uniformly through the action of the inner parts without any mechanical movement, which saves energy consumption.

Further, the concentrated water return pipeline 24 is also provided with a regulating valve 18 for dynamically adjusting the return flow of concentrated water, and the regulating valve 18 is equipped with a flow meter 17 for measuring the return flow of concentrated water. Through the adjustment of the regulating valve 18 and the flow meter 17, the concentrated water in each concentrated water return pipe 24 is evenly distributed, and then the amount of concentrated water entering the mixer 25 through each concentrated water return pipe 24 is more uniform, and the flow rate is further ensured. The mixed water concentration in the mixed water outlet pipe is uniform, which ensures that the workload of each reverse osmosis filter is relatively consistent, and avoids the reduction of the service life of the reverse osmosis filter caused by excessive or low concentration.

As a preferred embodiment of the present invention, the raw water tank is equipped with a water outlet main road 1, and the preferred water outlet main road 1 is provided with a water inlet flow meter 3, which facilitates the control of the water inlet. A number of high-pressure water inlet pipes are connected in parallel between the water outlet 1 and the mixer 25. Two centrifugal pumps for pressurizing the filtered water are connected in series on the water outlet 1. The centrifugal pump on the outlet side is located at the water inlet side. Within the head of the centrifugal pump. Pressurization by double pumps in series satisfies the operating pressure required by the membrane module. The preferred two centrifugal pumps are sequentially divided into a first centrifugal pump 7 and a second centrifugal pump 9 along the raw water flow direction, the outlet 8 of the first centrifugal pump is connected to the outlet 10 of the second centrifugal pump, and the motor of the second centrifugal pump 9 is reversed , wherein, the water outlet main road 1 is also provided with a bag filter 4 and a scale inhibitor 6 for sequentially filtering the incoming water, and the bag filter 4 and the scale inhibitor 6 are connected to the water inlet end of the centrifugal pump on the water inlet side . The descaling of the high-pressure feed water is completed through the anti-scale device 6, and the coarse filtration of the high-pressure feed water is completed through the bag filter 4, so as to ensure that the water entering the reverse osmosis filter is relatively free of large particles of impurities and prevent impurities from affecting the reverse osmosis filter. Membrane damage. The preferred bag filter 4 is provided with a bag filter outlet 5 to facilitate the discharge of impurities through the bag filter outlet 5 .

Moreover, the antiscalant 6 includes a communication tank connected with the high-pressure water inlet pipeline, and the communication tank is provided with an inlet for online dosing of the antiscalant. During the operation of the whole device, the antiscalant is added online to delay the fouling of the reverse osmosis filter membrane, prolong its service life, delay the fouling and cleaning frequency of the membrane module, and ensure the filtering effect.

Further, the mixer 25 is equipped with a cleaning pipeline 21 for backwashing. The cleaning pipeline 21 is provided with a cleaning water tank 23 connected to the outlet of the reverse osmosis filter, and a cleaning filter 22 connected to the outlet of the cleaning water tank 23. The outlet end of the cleaning filter 22 is connected with the cleaning water pump 20, the cleaning water pump 20 is connected with the concentrated water outlet pipeline 19, and the cleaning water outlet pipeline 2 is bypassed on the water outlet main road 1. Clean the concentrated water return pipe 24, the high-pressure water inlet pipe, the bag filter 4, etc. through the effluent of the reverse osmosis filter to ensure the reverse osmosis effect on the raw water and the coarse filtration effect on the raw water before reverse osmosis filtration.

Preferably, each water outlet branch 13 is provided with a pressure dial. The pressure in each water outlet branch 13 is determined through the pressure dial, and the centrifugal pump and the circulation pump 12 are adjusted in real time through the feedback of the pressure dial to ensure the balance and effectiveness of the water inlet pressure of the reverse osmosis filter. And preferably, the cleaning water pump 20 and the pressure dial are both electrically connected to the control system, and the reverse osmosis filter is also equipped with a water outlet monitoring mechanism electrically connected to the control system, and online automatic cleaning is performed through dual-parameter control of pressure and production rate.

As a preferred embodiment of the present invention, the whole device also includes a frame and a base 15 installed on the frame, a mixer 25, a high-pressure water inlet pipeline, a concentrated water return pipeline 24, a circulating pump 12, a centrifugal pump, and a reverse osmosis filter. Both the filter and scale inhibitor 6 are installed on the base 15, which integrates the functions of mechanical water filtration, pressurization, circulation, membrane filtration and online scale inhibition, making the whole device more compact in structure and easy to arrange and install. Preferably, the base 15 is also provided with an on-site microcomputer control system 14, which is electrically connected to each flow meter, regulating valve, circulation pump 12, centrifugal pump, cleaning water pump 20 and scale inhibitor 6, etc. to realize online start-stop function.

Adaptive changes made according to actual needs are within the protection scope of the present invention.

It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A membrane circulation system for uniform water distribution, characterized in that it includes a mixer for evenly mixing concentrated water circulating water and high-pressure water inlet, and the mixer is connected with mixed water outlets on both sides along the same radial direction. pipeline and a number of high-pressure water inlet pipes, the water inlet end of the mixed water outlet pipe is connected to one end of the mixer, and the water outlet end is connected in parallel with several water outlet branches, each of which is equipped with a mixed water pump outlet The circulating pump of the mixer, and each of the water outlet branches is equipped with a reverse osmosis filter, the water inlet end of the high-pressure water inlet pipe is connected to the raw water tank, and the water outlet end is equidistant from the mixer axis direction. The mixer is connected with the mixer, and the mixer is also connected with a number of concentrated water return pipes. The water inlet end of the concentrated water return pipe is bypassed on the concentrated water outlet pipe of the reverse osmosis filter. The mixers are connected and correspond to the water outlet ends of each of the high-pressure water inlet pipes along the axial direction of the mixer, and the water outlet ends of the concentrated water return pipes communicate along the circumference of the mixer At a position between the high-pressure water inlet pipe and the mixed water outlet pipe. 2. The membrane circulation system of uniform water distribution according to claim 1, characterized in that, the water outlet end of the concentrated water return pipe is connected with the high-pressure water inlet pipe and the mixed water along the circumference of the mixer. The outlet pipes are equally spaced. 3. The membrane circulation system of uniform water distribution according to claim 2, characterized in that, the mixer is provided with a high-pressure water inlet connected to the water outlet end of the high-pressure water inlet pipeline, and the high-pressure water inlet The radial width extends along the arrangement direction of the concentrated water return pipes. 4. The uniform water distribution membrane circulation system according to claim 2 or 3, characterized in that a pipe mixer is provided on the mixed water outlet pipe. 5. The membrane circulation system for uniform water distribution according to claim 4, characterized in that, the concentrated water return pipeline is also provided with a regulating valve for dynamically adjusting the return flow of concentrated water, and the regulating valve is equipped with a A flow meter for measuring the return flow of concentrated water. 6. The membrane circulation system for evenly distributing water according to claim 5, characterized in that, the raw water tank is equipped with a water outlet main road, and several high-pressure inlets are connected in parallel between the water outlet main road and the mixer. A water pipeline, two centrifugal pumps for pressurizing the filtered water are connected in series on the water outlet main road, and the centrifugal pump on the water outlet side is located within the head of the centrifugal pump on the water inlet side. 7. The membrane circulation system of uniform water distribution according to claim 6, characterized in that, the water outlet main road is also provided with a bag filter and a scale inhibitor for sequentially filtering the incoming water, and the bag filter The device and the scale inhibitor are connected to the water inlet end of the centrifugal pump on the water inlet side. 8. The membrane circulation system for evenly distributing water according to claim 7, characterized in that, the scale inhibitor includes a communication tank connected to the high-pressure water inlet pipeline, and the communication tank is provided with a supply line The inlet for adding antiscalant. 9. The membrane circulation system of uniform water distribution according to claim 8, characterized in that, the mixer is equipped with a cleaning pipeline connected with backwashing, and the cleaning pipeline is provided with the reverse osmosis filter A cleaning water tank connected to the water outlet, and a cleaning filter connected to the water outlet of the cleaning water tank. The water outlet end of the cleaning filter is connected to a cleaning water pump, and the cleaning water pump is connected to the concentrated water outlet pipeline. A cleaning water outlet pipe is bypassed on the water outlet main road. 10. The membrane circulation system for uniform water distribution according to claim 9, characterized in that each of the water outlet branches is provided with a pressure gauge.

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