WO2023245975A1

WO2023245975A1 - Membrane element, method for producing membrane element, and roll-type membrane assembly

Info

Publication number: WO2023245975A1
Application number: PCT/CN2022/132778
Authority: WO
Inventors: 梁松苗; 胡利杰; 张玲玲; 戴启军; 唐伦
Original assignee: 沃顿科技股份有限公司
Priority date: 2022-06-22
Filing date: 2022-11-18
Publication date: 2023-12-28
Also published as: CN115253692B; CN115253692A

Abstract

A membrane element (1), comprising a raw water pipe (2), a waste water pipe (3), a membrane bag (6), and produced water flow channel cloth (7), wherein the produced water flow channel cloth (7) is arranged on one side of the membrane bag (6); two ends of the membrane bag (6) are respectively connected to the raw water pipe (2) and the waste water pipe (3); the membrane bag (6) and the produced water flow channel cloth (7) are at least partially wound around an outer side of the raw water pipe (2); the membrane bag (6) comprises a membrane (62) for filtration; part of raw water permeates through the membrane (62) to form produced water to enter the produced water flow channel cloth (7); and the raw water which fails to permeate through the membrane (62) becomes waste water to enter the waste water pipe (3). Also provided are a method for producing the membrane element (1) and a roll-type membrane assembly.

Description

Membrane element, production method of membrane element and rolled membrane module

References to related applications

This application requires the priority of the prior invention patent application submitted in China with the filing date of June 22, 2022, the application number 202210715626.5, and the invention name is "membrane element, membrane element production method and rolled membrane module", The entire contents of this prior application are incorporated herein by reference.

Technical field

The present application belongs to the field of membrane separation technology in the field of pollution prevention and control equipment, and particularly relates to a membrane element, a production method of the membrane element and a rolled membrane module.

Background technique

Water is the fountain of life and an important resource for human survival. However, with the development of industrialization, the discharge of high-salinity wastewater is increasing. The discharge of high-salt wastewater accounts for more than 5% of the total wastewater discharge, and is still rising at a rate of 2% per year. High-salt wastewater mainly comes from printing and dyeing, chemical industry, pharmaceutical and other fields. At present, high-salt wastewater has always been a difficult and hot topic in the wastewater treatment industry.

In recent years, due to the rapid development of membrane separation technology, membrane water treatment technology has gradually been developed to treat high-salt wastewater. Its treatment effect has surpassed the traditional thermal concentration process. Membrane separation is a green and efficient physical separation technology. , suitable for the treatment and reuse of industrial wastewater, and is widely used in the treatment of high-salt wastewater.

As water shortages become increasingly severe, environmental protection policies become stricter, putting forward further requirements for wastewater treatment and reuse, urban sewage treatment, and seawater desalination. Some special industries, such as printing and dyeing wastewater, landfill leachate, salt lake lithium extraction, zero discharge of concentrated brine, etc., have put forward higher demands on the performance of membrane elements (high pressure resistance, anti-pollution, etc.).

Contents of the invention

This application provides membrane elements, membrane element production methods and rolled membrane modules.

This membrane element is used to filter raw water to produce concentrated water and product water. The membrane element includes:

Raw water pipe, an exchange channel is provided on the peripheral surface of the raw water pipe;

A concentrated water pipe, with an exchange channel provided on the peripheral surface of the concentrated water pipe; and

Membrane bag, water production channel cloth, the water production channel cloth is arranged on one side of the film bag, the two ends of the film bag are connected to the raw water pipe and the concentrated water pipe respectively, the film bag and the The water production channel cloth is at least partially wound around the outside of the raw water pipe,

The membrane bag includes a membrane sheet for filtration,

An axial end of the raw water pipe defines a raw water inlet, so that the raw water entering the raw water pipe from the raw water inlet can enter the membrane bag from the exchange channel of the raw water pipe, and part of the raw water passes through the membrane. It becomes produced water and enters the produced water channel cloth. The raw water that fails to pass through the diaphragm becomes concentrated water and enters the concentrated water pipe from the exchange channel of the concentrated water pipe.

In at least one embodiment, the membrane bag includes an inlet water channel network and the membrane sheets disposed on both sides of the inlet water channel network, and the membrane sheets seal the water inlet channel network to the membrane. in the film.

In at least one embodiment, two ends of the inlet water channel network are respectively wrapped around the raw water pipe and the concentrated water pipe.

In at least one embodiment, one circumferential end of the inlet water channel network is wrapped around the raw water pipe, and at least part of the circumferential area of the raw water pipe is between the inlet water channel network and the raw water pipe. There is no said diaphragm between them.

In at least one embodiment, the other circumferential end of the inlet water channel network is wrapped around the concentrated water pipe, and in at least part of the circumferential area of the concentrated water pipe, between the inlet water channel network and the concentrated water pipe There is no said diaphragm in between.

In at least one embodiment, the concentrated water flows out of the membrane element from the concentrated water pipe, and the produced water flows out of the produced water channel cloth along the axial direction of the membrane element.

In at least one embodiment, the exchange channels of the raw water pipe are evenly arranged in the raw water pipe, and the exchange channels of the concentrated water pipe are evenly arranged in the concentrated water pipe.

In at least one embodiment, the exchange channels on the raw water pipe and/or the concentrated water pipe include:

One or more slots; and/or

One or more rows of through holes.

In at least one embodiment, the raw water pipe is located on the axis of the membrane element.

In at least one embodiment, the membrane element further includes a membrane element shell and an end cover. The membrane element shell is located at the outermost side of the membrane element. The end caps are provided at one or both ends of the membrane element shell. .

The production method of membrane elements proposed in this application includes:

Provide a raw water pipe with an exchange channel on its circumference, a concentrated water pipe with an exchange channel on its circumference, a diaphragm and an inlet water channel network;

Seal the inlet water channel network between two layers of the membrane sheets to form a membrane bag;

The film bag is at least partially wound around the outside of the raw water pipe, so that one circumferential end of the inlet water channel network is wrapped around the raw water pipe, and at least part of the circumferential area of the raw water pipe is There is no diaphragm between the inlet water channel network and the raw water pipe; and

The film bag is partially wound around the outside of the concentrated water pipe, so that the other circumferential end of the inlet water channel network is wrapped around the concentrated water pipe, and at least part of the circumferential area of the concentrated water pipe is There is no diaphragm between the inlet water channel network and the concentrated water pipe.

In at least one embodiment, at the circumferential end of the membrane bag that is wound around the outside of the raw water pipe, the inlet water channel network is longer than the membrane sheet inside the inlet water channel network. one circumference or more of the original water pipe, and/or

At the circumferential end of the membrane bag that is wound around the outside of the raw water pipe, the membrane outside the inlet water channel network is longer than the inlet water channel network or is different from the inlet water channel network. Flush.

In at least one embodiment, at the other circumferential end of the membrane bag wrapped around the outside of the concentrated water pipe, the inlet water channel network is longer than the membrane sheet inside the inlet water channel network. one circumference or more of the concentrated water pipe, and/or

At the other circumferential end of the membrane bag that is wound around the outside of the concentrated water pipe, the membrane outside the inlet water channel network is longer than the inlet water channel network or is different from the inlet water channel network. The net is flush.

In at least one embodiment, the production method includes:

Two of the diaphragms are provided, and the two sides of the inlet water channel network located at both axial ends of the original water pipe are fixedly connected to the two sides of the two diaphragms located at both axial ends of the original water pipe. side; and

The four sides of the two diaphragms are connected correspondingly, so that the inlet water channel network is sealed in the two diaphragms.

In at least one embodiment, the production method includes:

Before winding the film bag around the raw water pipe or the concentrated water pipe, both sides of the inlet water channel network located at both axial ends of the raw water pipe are sealingly connected to the raw water pipe by gluing or ultrasonic welding. The two diaphragms are located at both sides of the axial ends of the raw water pipe.

In at least one embodiment, the production method includes:

Provide a single piece of the diaphragm, fold the diaphragm in half, sandwich the water inlet channel network between two layers of the diaphragm, and place the water inlet channel network in the axial direction of the original water pipe. The two sides at both ends are fixedly connected to the two sides of the diaphragm located at both axial ends of the raw water pipe; and

The remaining sides of the single diaphragm are connected correspondingly, so that the inlet water channel network is sealed in the single diaphragm.

The rolled membrane modules proposed in this application include:

Membrane elements as described above; and

A system housing is provided with a plurality of axially connected membrane elements inside the system housing.

In at least one embodiment, a sealing ring is provided between the membrane element and the system housing.

In at least one embodiment, the rolled membrane module further includes:

One or more raw water drainage channels, in the direction of water flow along the axial direction of the rolled membrane module, one of the raw water drainage channels is connected to the upstream end of the raw water pipe of the most upstream membrane element , and/or, use one or more raw water diversion channels to connect adjacent ends of adjacent raw water pipes;

One or more concentrated water drainage channels are used to connect adjacent ends of adjacent concentrated water pipes in the direction in which water flows along the axial direction of the rolled membrane module. are connected together, and/or one of the concentrated water drainage channels is connected to the downstream end of the concentrated water pipe of the most downstream membrane element.

In at least one embodiment, the rolled membrane module further includes:

A product water drainage channel is connected to the downstream end of the system housing.

In at least one embodiment, the system housing includes an intermediate cylindrical housing and a downstream axial end cover, leaving a gap between the downstream end of the most downstream membrane element and the downstream axial end cover. Water storage space, the produced water diversion channel is connected to the downstream axial end cover and communicates with the water storage space.

For traditional rolled membrane elements, the water inflow is from the end face, and the pressure-bearing parts are the end face of the membrane element, the diaphragm, and the inlet water channel network. The water inlet is unevenly distributed, and the telescope phenomenon is prone to occur under high pressure, which can damage the membrane element. , and the membrane element water inlet method of this application is through the central pipe (raw water pipe). After the central pipe is under pressure, the raw water flows into the membrane pocket. That is to say, this application changes the filtration logic of the membrane element, so that the raw water enters from the raw water pipe, and can evenly enter the membrane pocket from the circumference of the raw water pipe, which improves the uneven distribution of raw water in the membrane element and the problem that the membrane element is not resistant to high pressure, and improves With improved pressure resistance, the membrane element is less likely to leak.

Description of the drawings

Figure 1 shows a schematic structural diagram of a membrane element of a rolled membrane module according to an embodiment of the present application.

Figure 2 shows a cross-sectional view of a membrane element of a rolled membrane module according to an embodiment of the present application.

Figure 3 shows a schematic structural diagram of the raw water pipe or concentrated water pipe of the membrane element of the rolled membrane module according to one embodiment of the present application.

Figure 4 shows a schematic structural diagram of the raw water pipe or concentrated water pipe of the membrane element of the rolled membrane module according to another embodiment of the present application.

Figure 5 shows a schematic structural diagram of the membrane bag and water-produced channel cloth of the membrane element of the rolled membrane module according to the embodiment of the present application.

Figure 6 shows a schematic structural diagram of the membrane bag of the membrane element of the rolled membrane module according to the embodiment of the present application in an unfolded state.

Figure 7 shows a cross-sectional view of the raw water pipe and concentrated water pipe in Figure 6 .

Figure 8 shows a schematic structural diagram of a rolled membrane module according to an embodiment of the present application.

Detailed ways

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible ways of the present application, nor are they intended to limit the scope of the present application.

The embodiments of the present application provide a membrane element, a production method of the membrane element, and a rolled membrane module. The rolled membrane module includes a membrane element 1. The raw water can be filtered through the membrane element 1 to form concentrated water and product water.

Referring to Figures 1 and 2, the membrane element 1 includes a raw water pipe 2 and a concentrated water pipe 3. The raw water pipe 2 and the concentrated water pipe 3 can be made of polysulfone, ABS (acrylonitrile-butadiene-styrene ternary block copolymer), polyformaldehyde, nylon, polycarbonate or stainless steel. Referring to Figures 3 and 4, exchange channels, such as through slots 4 or through holes 5, can be provided on the peripheral walls of the raw water pipe 2 and the concentrated water pipe 3, so that water can flow into or out of the concentrated water pipe 3 and the raw water pipe 2 from the exchange channels. For example, water flows out of the original water pipe 2 from the exchange channel, and water flows into the concentrated water pipe 3 from the exchange channel, etc. In one embodiment of the present application, the diameter of the raw water pipe 2 may be equal to or larger than the diameter of the concentrated water pipe 3 , and the ratio of their inner diameters may be, for example, 1:1 to 1.5:1. The exchange channels can be evenly arranged on the peripheral walls of the pipes (raw water pipe 2, concentrated water pipe 3). The exchange channel may include a plurality of through slots 4 , or a plurality of columns of through holes 5 , or simultaneously include one or more through slots 4 and a plurality of through holes 5 .

Referring to Figures 5, 6, and 7, the membrane element 1 also includes a membrane bag 6 and a produced water channel cloth 7. The produced water channel cloth 7 can be disposed on one side of the membrane bag 6. Moreover, the two ends of the membrane bag 6 and the produced water channel cloth 7 are respectively connected to the raw water pipe 2 and the concentrated water pipe 3. The raw water pipe 2 can be used as the central pipe, like a scroll, to connect most of the membrane bag 6 and the produced water channel cloth 7 Wound around the raw water pipe 2 so that the raw water pipe 2 is located (including substantially located) on the axis of the membrane element 1. Of course, the concentrated water pipe 3 can also be wrapped around part of the film bag 6 and the produced water channel cloth 7 .

The membrane bag 6 includes an inlet water channel network 61 and membrane sheets 62 arranged on both sides of the inlet water channel network 61 . The inlet water channel network 61 can be wound around the raw water pipe 2 and the concentrated water pipe 3 for one or more weeks (the inside of the inlet water channel network 61, that is, there is no diaphragm 62 on the side facing the raw water pipe 2 or the concentrated water pipe 3), and then used The diaphragm 62 seals the inlet water channel network 61 so that the raw water in the raw water pipe 2 can directly pass into the membrane bag 6 (that is, enter between the two layers of diaphragms 62). This application does not limit the specific type of the membrane 62. For example, the membrane 62 can be a nanofiltration membrane, a reverse osmosis membrane, etc.

Of course, the inlet water channel network 61 can be wrapped around the raw water pipe 2 and the concentrated water pipe 3 for less than one week. Although it is not an optimal embodiment, it can still play a role. It can be understood that at least part of the area between the inlet water channel network 61 and the raw water pipe 2 and the concentrated water pipe 3 does not have the diaphragm 62 . For example, two membrane sheets 62 can be provided, and the inlet water channel network 61 is sealed therein to form the membrane bag 6 . For example, at the circumferential end of the membrane bag 6 wound around the outside of the raw water pipe 2, the inlet water channel network 61 is longer than the diaphragm 62 inside the inlet water channel network 61 by one circumference of the raw water pipe 2 or more, and/ Or at the circumferential end of the membrane bag that is wound around the outside of the raw water pipe 2, the diaphragm 62 outside the inlet water channel network 61 is longer than the inlet water channel network 61 or flush with the inlet water channel network 61. Of course, the diaphragms 62 on the inner and outer sides of the inlet water channel network 61 can be made shorter than the inlet water channel network 61 so that the water inlet channel network 61 can be sealed by the diaphragm 62 . The same applies to the 3 concentrated water pipes.

Alternatively, a diaphragm 62 can be provided, and the diaphragm 62 is folded in half and placed outside the inlet water channel network 61 (that is, the water inlet channel network 61 is sandwiched between the two layers of diaphragms 62 formed after being folded in half), and The three sides of the film on both sides of the fold of the film 62 are correspondingly sealed together to form the film bag 6 . The sealing method can be adhesive, ultrasonic welding, etc. It can be understood that the functional surface of the membrane 62 in the membrane bag 6 faces the inlet water channel network 61 located inside.

In this application, the inlet water channel network 61 is sealed and arranged in the diaphragm 62, and the two ends (circumferential ends or lengthwise ends) of the inlet water channel network 61 are directly and fixedly connected to the raw water pipe 2 and the concentrated water pipe 3 , so that the fixing effect of the inlet water channel network 61 is better. It avoids that the inlet water channel network in the prior art cannot be fixed on both sides (the prior art lacks concentrated water pipes), and avoids that the inlet water channel network 61 may slip when the water pressure is too high, causing it to be easily flushed out of the membrane element. or damage. Moreover, only one film bag can be used in this application, which avoids the problems in the prior art that multiple stacked film bags are easy to slide relative to each other, the rolling process is complicated, and the yield is low.

The working principle of the membrane element in this application is: raw water enters the membrane element 1 from one end of the raw water pipe 2 (for example, the left end in Figure 2, which serves as the raw water inlet), and blocks the other end of the raw water pipe 2 (for example, the left end in Figure 2 on the right side); the raw water evenly enters the filtration area formed by the membrane bag 6 through the exchange channels on the 2 peripheral walls of the raw water pipe; a part of the water is retained in the membrane bag 6, forming concentrated water, along the inlet water channel network in the membrane bag 6 61 enters the concentrated water pipe 3; the water that can pass through the membrane bag 6 (passing through the diaphragm 62 along the thickness direction of the diaphragm 62) is the produced water, and is discharged from the produced water channel cloth 7 along the axial direction of the membrane element 1.

It can be understood that in the prior art, raw water enters the inlet water channel network from the axial end side of the membrane element. Under the action of pressure, part of the raw water in the inlet water channel network enters the membrane bag along the radial direction of the membrane element to form produced water. , flows into the central tube with a through hole along with the membrane bag, and flows out from the axial direction of the central tube; the water that fails to enter the membrane bag is concentrated water, and flows out from the other end of the membrane element along the axial direction of the membrane element. The flow path from one end face to the other end face is long. When the raw water is highly salty, the concentration polarization phenomenon of the membrane bag is serious, which may cause the membrane channel to be blocked, the membrane flux to reduce, and the membrane element to be damaged. The water pressure in the tank becomes high. Under high pressure, the inlet water channel network in the membrane bag is easily flushed out, with one end surface collapsing and the other protruding, and even a "telescope" phenomenon occurs (the middle of the membrane tube spirally wound into a columnar shape protrudes, like an extended telescope). Damage membrane elements. It will cause the membrane element to leak and shorten the service life of the membrane element.

The raw water in this application flows evenly from the exchange channel of the raw water pipe 2 to the membrane bag 6 provided outside the raw water pipe 2. Compared with the existing technology, the incoming water pressure can be balanced and the pressure resistance of the membrane element 1 is improved. Furthermore, The design of the exchange channel (through slot 4, through hole 5, etc.) allows the raw water to form turbulent flow after entering the membrane bag 6 from the raw water pipe 2, increasing the water flow speed, reducing the degree of contamination of the membrane 62, and thereby increasing the pressure resistance of the membrane element 1 Ability to increase the service life of membrane element 1.

In the prior art, the solution that the produced water needs to be collected into the central tube requires multiple membrane bags in the prior art to be equipped with bottom glue to prevent the produced water from flowing out. However, this application only uses a single film bag 6, and the area in the film bag 6 that needs to be glued is relatively small (the amount of glue applied in the bending embodiment of a single film piece is less), so that the effective area of the film piece 62 in the film bag 6 is larger. More, the filtration efficiency is higher.

For example, membrane sheets of the same length are selected and made into a 25-page membrane bag according to the traditional method, and rolled according to the traditional rolling method. The effective membrane area of the membrane element is 380 square feet (ft ² ); while using this application The structure of the membrane element 1 is made by making the membrane into a single-page membrane pocket, which reduces the primer for each page when rolling traditional membrane elements. The effective membrane area of the membrane element 1 reaches 415 square feet (ft ² ). The membrane The effective area has increased by 9.2%, which means more raw water can be processed and the efficiency is higher.

Referring to Figures 1 and 2, the membrane element 1 may also include a membrane element housing 8 and an end cover 9. The membrane element housing 8 is located at the outermost side of the membrane element 1 . End caps 9 are provided at both ends of the membrane element housing 8 to fix the membrane element 1 as a whole. The membrane element shell 8 can play a protective role and improve the overall pressure resistance of the membrane element. The membrane element shell 8 can be made of fiberglass, heat shrink tube, bellows or thermoplastic elastomer, etc. Of course, the end cover 9 can be provided with channels aligned with the raw water pipe 2 and the concentrated water pipe 3, and the membrane element housing 8 can be closed at one end, so that the membrane element 1 is only provided with the end cover 9 at the other end.

Referring to FIG. 8 , the rolled membrane module may also include a system housing 10 , and multiple membrane elements 1 may be axially connected and installed inside the system housing 10 . The outer peripheral surface of the end cover 9 of the membrane element 1 can be provided with a sealing ring 11, which can be an O-ring, a Y-ring, etc., to seal the membrane element 1 and the system shell 9. The system housing 10 can also be provided with a raw water drainage channel 12, a concentrated water drainage channel 13 and a produced water drainage channel 14. Raw water can be added to the raw water pipe 2 through the raw water drainage channel 12, the concentrated water in the concentrated water pipe 3 can be led out through the concentrated water drainage channel 13, and the produced water accumulated at one end of the system housing 10 can be led out through the produced water drainage channel 14.

The raw water diversion channel 12, the concentrated water diversion channel 13 and the produced water diversion channel 14 may all include or be composed of pipe members.

In the direction of water flowing along the axial direction of the rolled membrane module, the upstream end of the raw water pipe 2 of the most upstream membrane element 1 can be connected to the raw water drainage channel 12 for introducing raw water; use one or more raw water drainage channels The channel 12 connects the adjacent ends of adjacent raw water pipes 2 and seals the downstream end of the raw water pipe 2 of the most downstream membrane element 1.

In the direction in which water flows along the axial direction of the rolled membrane module, the upstream end of the concentrated water pipe 3 of the most upstream membrane element 1 can be closed; one or more concentrated water drainage channels 13 can be used to connect the adjacent concentrated water pipes. The adjacent ends of the concentrated water pipe 3 of the most downstream membrane element 1 are connected to a concentrated water drainage channel 13 for drawing out the concentrated water.

A produced water drainage channel 14 can be connected at the downstream end of the system housing 10 .

The system housing 10 may include a middle cylindrical housing and two axial end covers, and a water storage space may be left between the downstream end of the most downstream membrane element 1 and the downstream axial end cover of the system housing 10 to Make the water flow led from the produced water diversion channel 14 uniform and stable. It will be appreciated that the system housing 10 may have only one axial end cap, or no axial end cap.

Compared with not setting up a concentrated water pipe and allowing the concentrated water to flow out directly from the peripheral surface of the membrane element, the design of the concentrated water pipe 3 in this application clearly distinguishes the flow paths of the concentrated water and the produced water, which is beneficial to the pipelines after the membrane element is formed into the membrane module. Correspondence and collection of concentrated water facilitate assembly and drainage.

The above is the preferred embodiment of the present application. It should be noted that those skilled in the art can also make several improvements and modifications without departing from the principles of the present application. These improvements and modifications should also be regarded as the present application. The scope of protection applied for.

List of reference signs

1 membrane element

2 original water pipes

3 concentrated water pipes

4 slots

5 through holes

6 film bags

61 water inlet channel network

62 diaphragms

7 water flow channel cloth

8 membrane element housing

9 end caps

10 system shell

11 sealing ring

12 Raw water diversion channel

13Concentrated water diversion channel

14 produced water drainage channel

Claims

A membrane element used to filter raw water to produce concentrated water and product water, characterized in that the membrane element (1) includes:

Raw water pipe (2), an exchange channel is provided on the peripheral surface of the raw water pipe (2);

A concentrated water pipe (3), an exchange channel is provided on the peripheral surface of the concentrated water pipe (3); and

Membrane bag (6) and water-produced channel cloth (7). The water-produced channel cloth (7) is arranged on one side of the membrane bag (6). Both ends of the membrane bag (6) are respectively connected to the membrane bag (6). The raw water pipe (2) and the concentrated water pipe (3), the membrane bag (6) and the water production channel cloth (7) are at least partially wound around the outside of the raw water pipe (2),

The membrane bag (6) includes a membrane sheet (62) for filtration,

One axial end of the raw water pipe (2) defines a raw water inlet, so that the raw water entering the raw water pipe (2) from the raw water inlet can enter the membrane bag (2) from the exchange channel of the raw water pipe (2). 6), part of the raw water passes through the diaphragm (62) to become produced water and enters the produced water channel cloth (7), and the raw water that fails to pass through the diaphragm (62) becomes concentrated water and flows from the The exchange channel of the concentrated water pipe (3) enters the concentrated water pipe (3).
The membrane element according to claim 1, characterized in that the membrane bag (6) includes an inlet water channel network (61) and the diaphragms (61) disposed on both sides of the inlet water channel network (61). 62), the diaphragm (62) seals the inlet water channel network (61) in the diaphragm (62).
The membrane element according to claim 2, characterized in that both ends of the inlet water channel network (61) are respectively wound around the raw water pipe (2) and the concentrated water pipe (3).
The membrane element according to claim 2, characterized in that one circumferential end of the inlet water channel network (61) is wound around the original water pipe (2), and at least one end of the circumferential direction of the original water pipe (2) is In some areas, the diaphragm (62) is not provided between the inlet water channel network (61) and the raw water pipe (2).
The membrane element according to claim 2, characterized in that the other circumferential end of the inlet water channel network (61) is wound around the concentrated water pipe (3), and the other end in the circumferential direction of the concentrated water pipe (3) is At least part of the area does not have the diaphragm (62) between the inlet water channel network (61) and the concentrated water pipe (3).
The membrane element according to claim 1, characterized in that the concentrated water flows out of the membrane element (1) from the concentrated water pipe (3), and the produced water flows from the produced water channel cloth (7). The membrane element (1) flows out along the axial direction of the membrane element (1).
The membrane element according to claim 1, characterized in that the exchange channels of the raw water pipe (2) are evenly arranged in the raw water pipe (2), and the exchange channels of the concentrated water pipe (3) are evenly arranged in the Concentrated water pipe (3).
The membrane element according to claim 1, characterized in that the exchange channels on the raw water pipe (2) and/or the concentrated water pipe (3) include:

One or more slots (4); and/or

One or more rows of through holes (5).
The membrane element according to claim 1, characterized in that the raw water pipe (2) is located on the axis of the membrane element (1).
The membrane element according to claim 1, characterized in that the membrane element (1) also includes a membrane element shell (8) and an end cover (9), the membrane element shell (8) is located in the membrane element ( 1), the end cap (9) is provided at one or both ends of the membrane element housing (8).
A production method of membrane elements, characterized by including:

Provide a raw water pipe (2) with an exchange channel on its peripheral surface, a concentrated water pipe (3) with an exchange channel on its peripheral surface, a diaphragm (62) and an inlet water channel network (61);

Seal the inlet water channel network (61) between the two layers of membranes (62) to form a membrane bag (6);

The film bag (6) is at least partially wound around the outside of the raw water pipe (2), so that one circumferential end of the inlet water channel network (61) is wound around the raw water pipe (2). At least part of the circumferential area of the raw water pipe (2) does not have the diaphragm (62) between the inlet water channel network (61) and the raw water pipe (2); and

The film bag (6) is partially wound around the outside of the concentrated water pipe (3), so that the other circumferential end of the inlet water channel network (61) is wrapped around the concentrated water pipe (3). At least part of the circumferential area of the concentrated water pipe (3) does not have the diaphragm (62) between the inlet water channel network (61) and the concentrated water pipe (3).
The production method of membrane element according to claim 11, characterized in that:

At the circumferential end of the film bag (6) that is wound around the outside of the raw water pipe (2), the water inlet channel network (61) is larger than all the areas inside the inlet water channel network (61). The diaphragm (62) is one circumference or more long of the raw water pipe (2), and/or

At the circumferential end of the membrane bag (6) that is wound around the outside of the raw water pipe (2), the diaphragm (62) outside the inlet water channel network (61) is larger than the inlet water channel network (61). The water channel network (61) is long or flush with the inlet water channel network (61).
The production method of membrane element according to claim 11, characterized in that:

At the other circumferential end of the membrane bag (6) wound around the outside of the concentrated water pipe (3), the inlet water channel net (61) is smaller than the inlet water channel net (61) inside. The diaphragm (62) is one circumference or more long of the concentrated water pipe (3), and/or

At the other circumferential end of the membrane bag (6) wound around the outside of the concentrated water pipe (3), the diaphragm (62) outside the inlet water channel network (61) is smaller than the The inlet water channel network (61) is long or flush with the inlet water channel network (61).
The production method of membrane elements according to claim 11, characterized in that the production method includes:

Two diaphragms (62) are provided, and both sides of the inlet water channel network (61) located at both axial ends of the original water pipe (2) are fixedly connected to the two diaphragms (62). The two sides located at both axial ends of the original water pipe (2); and

The four sides of the two diaphragms (62) are connected correspondingly, so that the water inlet channel network (61) is sealed in the two diaphragms (62).
The production method of membrane elements according to claim 14, characterized in that the production method includes:

Before winding the film bag (6) around the raw water pipe (2) or the concentrated water pipe (3), the parts of the inlet water channel network (61) located on the raw water pipe (3) are glued or ultrasonic welded. The two sides of the two axial ends of the water pipe (2) are sealingly connected to the two sides of the two diaphragms (62) located at the two axial ends of the original water pipe (2).
The production method of membrane elements according to claim 11, characterized in that the production method includes:

Provide a single piece of the diaphragm (62), fold the diaphragm (62) in half, and sandwich the inlet water channel network (61) between two layers of the diaphragm (62). The two sides of the water channel network (61) located at both axial ends of the original water pipe (2) are fixedly connected to the two sides of the diaphragm (62) located at both axial ends of the original water pipe (2). ;as well as

The remaining sides of the single diaphragm (62) are connected correspondingly, so that the inlet water channel network (61) is sealed in the single diaphragm (62).
The method for producing a membrane element according to any one of claims 11 to 16, wherein the membrane element is the membrane element according to any one of claims 1 to 10.
A rolled membrane module, characterized by including:

A plurality of membrane elements according to any one of claims 1 to 10; and

System housing (10). A plurality of axially connected membrane elements (1) are arranged inside the system housing (10).
The rolled membrane module according to claim 18, characterized in that a sealing ring (11) is provided between the membrane element (1) and the system shell (10).
The rolled membrane module according to claim 18 or 19, further comprising:

One or more raw water drainage channels (12), in the direction of water flow along the axial direction of the rolled membrane module, in the raw water pipe (2) of the most upstream membrane element (1) The upstream end is connected to one of the raw water drainage channels (12), and/or, one or more of the raw water drainage channels (12) are used to connect the adjacent ends of the adjacent raw water pipes (2);

One or more concentrated water drainage channels (13) are used to connect adjacent ones of the concentrated water drainage channels (13) in the direction in which water flows along the axial direction of the rolled membrane module. The adjacent ends of the concentrated water pipes (3) are connected, and/or the downstream end of the concentrated water pipe (3) of the most downstream membrane element (1) is connected to one of the concentrated water drainage channels (13). .
The rolled membrane module according to claim 18 or 19, further comprising:

The produced water drainage channel (14) is connected to the downstream end of the system housing (10).
The rolled membrane module according to claim 21, characterized in that:

The system casing (10) includes an intermediate cylindrical casing and a downstream axial end cover. There is an accumulator between the downstream end of the most downstream membrane element (1) and the downstream axial end cover. Water space, the produced water drainage channel (14) is connected to the downstream axial end cover and communicates with the water storage space.