Material separation membrane device and material-liquid separation method

Abstract

The invention provides a material separation membrane device and a material-liquid separation method, and belongs to the technical field of nanofiltration membrane separation. Comprising a liquid feeding and distributing assembly, a membrane element assembly, a permeate liquid discharging assembly and a concentrated liquid discharging assembly, the membrane element assembly comprises a membrane shell, a plurality of membrane elements arranged in the membrane shell and connectors for connecting two adjacent membrane elements; the liquid feeding and distributing assembly is connected with the stock solution storage assembly and the membrane shell, the permeate discharging assembly is connected with the membrane shell and the liquid feeding and distributing assembly, and the concentrated liquid discharging assembly is connected with the membrane shell and the liquid feeding and distributing assembly. After materials enter the membrane shell, feed liquid can quickly and uniformly immerse the end surface of the membrane element, so that the accumulation of the materials in an area with low flow velocity is greatly reduced, and the problem of non-uniform feeding in the material separation and concentration process is solved; by arranging the permeate liquid discharging assembly and the concentrated liquid discharging assembly, the problems that in the material separation and concentration process, permeate liquid and concentrated liquid cannot reach the standard at a time, and materials are lost after operation is finished are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of nanofiltration membrane separation and relates to a material separation membrane device and a material-liquid separation method. Background Art

[0002] The excellent separation performance of nanofiltration membranes has always attracted widespread attention from academia and industry. Nanofiltration membranes can not only separate the gradient interception of different inorganic salts, but also accurately separate substances with a molecular weight of 200-1000. During the membrane separation process, there is no phase change and the energy consumption is low. Especially for temperature-sensitive materials, membrane separation is the best separation method. With the continuous development of membrane separation technology, membrane technology applications have been widely used. Nanofiltration membrane is an important filtration method to solve material concentration and purification.

[0003] In the food fermentation, biopharmaceutical and other industries, it is very important to improve the quality and yield of high-value organic substances, such as amino acids, antibiotics, and different small molecule sugars. In the process of using membrane systems for material separation, there are problems such as low concentration multiples and substandard quality of primary products, and a large amount of material waste is caused in the process of feeding and discharging.

[0004] At present, the conventional separation and purification membrane systems on the market cannot solve the problems of uniform feeding and efficient discharge. With the increasing demand for material separation membranes, a material separation membrane device and method are urgently needed to solve the problems existing in existing equipment. Summary of the invention

[0005] The present invention provides a material separation membrane device, comprising a liquid inlet material distribution assembly, a membrane element assembly, a permeate liquid discharge assembly and a concentrated liquid discharge assembly;

[0006] The membrane element assembly comprises a membrane shell, a membrane element and a connector. The membrane element comprises a plurality of membrane elements which are arranged at intervals along the liquid inlet direction, and two adjacent membrane elements are connected to each other through a connector. A cavity is provided inside the membrane shell, and the membrane element and the connector are arranged in the cavity of the membrane shell.

[0007] One end of the liquid inlet material assembly is connected to the raw liquid storage assembly, and the other end of the liquid inlet material assembly is connected to the membrane shell, so as to transport the raw liquid into the membrane shell;

[0008] One end of the permeate liquid discharge assembly is connected to the membrane shell, and the other end of the permeate liquid discharge assembly is connected to the liquid inlet distribution assembly, so as to output the permeate liquid at the membrane element assembly to the liquid inlet distribution assembly;

[0009] One end of the concentrated liquid discharge assembly is connected to the membrane shell, and the other end of the concentrated liquid discharge assembly is connected to the liquid inlet cloth assembly, so as to transfer the concentrated liquid at the membrane element assembly back to the liquid inlet cloth assembly.

[0010] Optionally, the material separation membrane element in the membrane shell includes a collecting tube, a produced water flow channel, a membrane sheet, a feed grid and an outer shell;

[0011] The collecting tube is provided with a plurality of pieces respectively placed in a plurality of membrane elements, and two adjacent collecting tubes are connected in series by a connector;

[0012] The water production channel, the membrane, the feed grid and the outer shell are mutually sleeved in sequence from close to the collecting pipe to far away from the collecting pipe;

[0013] The feed liquid arranged in the raw liquid storage assembly enters the feed grid in the membrane element assembly from the liquid inlet distribution assembly. Under the action of pressure, the feed passes through the membrane to become permeate liquid. The permeate liquid enters the collection pipe along the produced water flow channel. The collection pipe, connected with the connector, transports the permeate liquid back to the liquid inlet distribution assembly through the permeate discharge assembly.

[0014] Optionally, a liquid inlet sealing ring is provided on one end of the outer shell close to the liquid inlet cloth assembly.

[0015] Optionally, a fixer is further provided on one end of the outer shell away from the liquid inlet cloth assembly, for fixing the membrane shell and the membrane element to each other.

[0016] Optionally, the liquid feed distribution assembly includes a feed pipe and a feed distributor, one end of the feed pipe is connected to the liquid pumping structure, the other end of the feed pipe is connected to the feed distributor, and the feed distributor is connected to the membrane element.

[0017] Optionally, a feed valve is provided between the feed pipe and the feed distributor.

[0018] Optionally, the permeate liquid discharge assembly includes a permeate liquid pipe, one end of the permeate liquid pipe is connected to the membrane shell, and the other end of the permeate liquid pipe is connected to the liquid inlet distribution assembly;

[0019] The concentrated liquid discharge assembly comprises a concentrated liquid pipe, one end of which is connected to the membrane shell, and the other end of which is connected to the liquid inlet cloth assembly.

[0020] Optionally, a permeate valve on the permeate line;

[0021] A concentrate valve is also provided on the concentrate pipe.

[0022] Optionally, the permeate liquid discharge assembly further comprises a permeate liquid discharge valve, a permeate liquid discharge pump, a permeate liquid return pipe and a permeate liquid return valve; one end of the permeate liquid return pipe is connected to the permeate liquid pipe, and the other end of the permeate liquid return pipe is connected to the liquid inlet distribution assembly; the permeate liquid return valve is arranged on one end of the permeate liquid return pipe close to the liquid inlet distribution assembly; the permeate liquid discharge valve and the permeate liquid discharge pump are also arranged on the permeate liquid pipe;

[0023] The concentrate discharge component also includes a concentrate discharge valve, a concentrate discharge pump, a concentrate reflux pipe and a concentrate reflux valve; one end of the concentrate reflux pipe is connected to the concentrate pipe, and the other end of the concentrate reflux pipe is connected to the liquid inlet distribution component; the concentrate reflux valve is arranged on one end of the concentrate reflux pipe close to the liquid inlet distribution component; a concentrate discharge valve and a concentrate discharge pump are also provided on the concentrate pipe.

[0024] The present invention also provides a method for separating feed and liquid using the material separation membrane device as described above, which is specifically as follows:

[0025] When the material separation membrane device operates normally, the feed valve, permeate valve and concentrate valve are all in a normally open state, and the permeate discharge valve, permeate return valve and concentrate return valve are all in a normally closed state. At this time, the material separation and concentration are connected and the material separation membrane device continuously concentrates the material. When the feed liquid does not pass through the membrane, the feed liquid continues to flow along the feed grid, and flows into the concentrate pipe after passing through multiple membrane elements in sequence, and is collected as concentrate.

[0026] When it is detected that the permeate concentration exceeds the upper limit requirement and / or the subsequent process of the permeate fails, the material separation membrane device automatically starts the permeate reflux, then the feed valve, permeate discharge valve, permeate reflux valve and concentrated liquid valve are all opened, and the permeate valve, concentrated liquid discharge valve and concentrated liquid reflux valve are all closed; at this time, the permeate flows back to the feed pipe for re-filtration; until the permeate meets the requirements, normal operation is resumed and the next process is entered;

[0027] When it is detected that the concentrate concentration is lower than the upper limit requirement and / or the subsequent process of the concentrate fails, the material separation membrane device automatically starts the concentrate reflux, then the feed valve, permeate valve, concentrate discharge valve and concentrate reflux valve are all opened, and the permeate discharge valve, permeate reflux valve and concentrate valve are all closed; at this time, the concentrate flows back to the feed pipe for re-filtration, and normal operation is resumed until the concentrate meets the requirements, and then enters the next process;

[0028] When it is detected that the permeate concentration is lower than the permeate lower limit requirement and the permeate subsequent process is short of material, the material separation membrane device automatically starts the permeate blending, then the feed valve, permeate valve, permeate reflux valve and concentrate valve are all opened, and the permeate discharge valve, concentrate discharge valve and concentrate reflux valve are all closed; at this time, the permeate is mixed with part of the feed, and the permeate water volume and water quality meet the requirements at the same time before entering the next process;

[0029] When it is detected that the concentration of the concentrate is higher than the upper limit of the concentration requirement and there is a shortage of materials for the subsequent process of the concentrate, the material separation membrane device automatically starts the blending of the concentrate, then the feed valve, permeate valve, concentrate valve and concentrate reflux valve are all opened, and the permeate discharge valve, permeate reflux valve and concentrate discharge valve are all closed; at this time, the concentrate is mixed with part of the feed, and the concentrate enters the next process after the water volume and water quality meet the requirements;

[0030] When the material separation membrane device finishes running, the permeate discharge valve and the concentrated liquid discharge valve are both in the normally open state, and the feed valve, permeate valve, permeate reflux valve, concentrated liquid valve and concentrated liquid reflux valve are all in the normally closed state; at this time, the permeate in the collection tube in the membrane element is discharged by the permeate discharge pump and collected as permeate; the concentrated liquid in the feed grid in the membrane element is discharged by the concentrated liquid discharge pump and collected as concentrated liquid.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The material separation membrane device provided by the present invention comprises a liquid inlet material distribution assembly, a membrane element assembly, a permeate liquid discharge assembly and a concentrated liquid discharge assembly. The liquid feed enters the membrane shell in the membrane element assembly through the liquid inlet material distribution assembly. After the material enters the membrane shell, the liquid feed can quickly and evenly penetrate into the end surface of the membrane element, greatly reducing the accumulation of material in the area with low flow rate, thereby solving the problem of uneven feed in the material separation and concentration process. At the same time, by arranging the permeate liquid discharge assembly and the concentrated liquid discharge assembly, the problem that the permeate liquid and the concentrated liquid cannot reach the standard at one time in the material separation and concentration process is solved, and the problem that the permeate liquid concentration is too low and the concentrated liquid concentration is too high in the material separation and concentration process, requiring feed blending, and the problem that the permeate liquid and the concentrated liquid are not easy to discharge and collect after the operation is completed is solved.

[0033] (2) The material separation membrane device provided by the present invention has the characteristics of simple and easy operation, convenient modification, low cost and good application prospects.

[0034] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 is a schematic diagram of a material separation membrane device in an embodiment of the present invention;

[0037] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle membrane shell.

[0038] in:

[0039] 1. Feed pipe, 2. Feed valve, 3. Feed distributor, 4. Connector, 5. Membrane element, 6. Fixer, 7. Permeate discharge valve, 8. Permeate discharge pump, 9. Permeate pipe, 10. Permeate valve, 11. Permeate reflux pipe, 12. Permeate reflux valve, 13. Concentrate discharge valve, 14. Concentrate discharge pump, 15. Concentrate valve, 16. Concentrate pipe, 17. Concentrate reflux pipe, 18. Concentrate reflux valve, 19. Membrane shell, 19.1. Collecting pipe, 19.2. Liquid inlet sealing ring, 19.3. Produced water flow channel, 19.4. Diaphragm, 19.5. Feed grid, 19.6. Outer shell. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present invention more clear and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all simplified and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the implementation of the present invention; the "number" mentioned in the present invention is not limited to the specific number in the examples in the accompanying drawings; the directions or positional relationships indicated by "front", "middle", "back", "left", "right", "up", "down", "top", "bottom", "middle", etc. mentioned in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor can they be understood as limitations on the present invention.

[0041] Example:

[0042] See also Figure 1 and Figure 2 As shown, the material separation membrane device provided by the present invention is used to separate the raw liquid by the separation membrane product. Specifically, the material separation membrane device includes a liquid feed cloth assembly, a membrane element assembly, a permeate liquid discharge assembly and a concentrated liquid discharge assembly;

[0043] The membrane element assembly comprises a membrane shell 19, a membrane element 5 and a connector 4. The membrane element 5 comprises a plurality of membrane elements spaced apart from each other along the liquid inlet direction, and two adjacent membrane elements 5 are connected to each other through the connector 4. A cavity is provided inside the membrane shell 19, and the membrane element 5 and the connector 4 are arranged in the cavity of the membrane shell 19.

[0044] One end of the liquid inlet material assembly is connected to the raw liquid storage assembly, and the other end of the liquid inlet material assembly is connected to the membrane shell 19, for conveying the raw liquid into the membrane shell;

[0045] One end of the permeate discharge assembly is connected to the membrane housing 19, and the other end of the permeate discharge assembly is connected to the inlet distribution assembly, so as to output the permeate at the membrane element assembly to the inlet distribution assembly;

[0046] One end of the concentrated liquid discharge assembly is connected to the membrane shell 19, and the other end of the concentrated liquid discharge assembly is connected to the liquid inlet distribution assembly, so as to transfer the concentrated liquid at the membrane element assembly back to the liquid inlet distribution assembly.

[0047] Furthermore, the membrane shell 19 includes a collecting pipe 19.1, a water production channel 19.3, a membrane 19.4, a feed grid 19.5 and an outer shell 19.6;

[0048] The collecting tube 19.1 is provided with a plurality of membrane elements 5, respectively, and two adjacent collecting tubes 19.1 are connected in series by a connector 4;

[0049] The water production channel 19.3, the membrane 19.4, the feed grid 19.5 and the outer shell 19.6 are mutually arranged in sequence from the direction close to the collecting pipe 19.1 to the direction away from the collecting pipe 19.1; specifically, the water production channel 19.3, the membrane 19.4, the feed grid 19.5 are wound around the collecting pipe 19.1, and the outer shell 19.6 is used to cover the above materials;

[0050] The feed liquid enters the feed grid 19.5 in the membrane element assembly from the feed distributor 3. Under the action of pressure, the feed passes through the membrane 19.4 and becomes permeate. The permeate enters the collection pipe 19.1 along the produced water flow channel 19.3. The collection pipe 19.1 is connected to the connector 4 and transports the permeate back to the feed distribution assembly through the permeate discharge assembly.

[0051] Preferably, a liquid inlet sealing ring 19.2 is further provided on one end of the outer shell 19.6 close to the feed distributor 3, and the liquid inlet sealing ring 19.2 is used to seal the liquid inlet end of the membrane shell 19. Further preferably, the liquid inlet sealing ring 19.2 is preferably arranged with an opening expanded outward to effectively ensure the sealing of the liquid inlet end of the membrane shell 19.

[0052] Preferably, a fixer 6 is further provided on one end of the outer shell 19.6 away from the feed distributor 3, for fixing the membrane shell 19 and the membrane element 5 to each other. Further preferably, the fixer 6 is configured as a rubber gasket.

[0053] Furthermore, the liquid feed distribution assembly includes a feed pipe 1 and a feed distributor 3, one end of the feed pipe 1 is connected to the liquid pumping structure, the other end of the feed pipe 1 is connected to the feed distributor 3, and the feed distributor 3 is connected to the membrane element 5.

[0054] Preferably, a feed valve 2 is further provided between the feed pipe 1 and the feed distributor 3 , and the connection or disconnection of the feed pipe 1 is controlled by the feed valve 2 .

[0055] Preferably, a filtering structure is further provided in the feed pipe 1 , and the filtering structure is used to filter the permeate and the concentrated liquid that flow back into the feed pipe 1 through the permeate return pipe and the concentrated liquid return pipe.

[0056] Furthermore, the permeate liquid discharge assembly includes a permeate liquid pipe 9, one end of the permeate liquid pipe 9 is connected to the membrane shell 19, and the other end of the permeate liquid pipe 9 is connected to the liquid inlet distribution assembly.

[0057] Preferably, a permeate valve 10 is provided on the permeate pipe 9 , and the permeate valve 10 is used to control the connection or disconnection of the permeate pipe 9 .

[0058] Preferably, the permeate liquid discharge assembly further comprises a permeate liquid discharge valve 7, a permeate liquid discharge pump 8, a permeate liquid return pipe 11 and a permeate liquid return valve 12; one end of the permeate liquid return pipe 11 is connected to the permeate liquid pipe 9, and the other end of the permeate liquid return pipe 11 is connected to the liquid inlet distribution assembly; the permeate liquid return valve 12 is arranged on one end of the permeate liquid return pipe 11 close to the liquid inlet distribution assembly; the permeate liquid discharge valve 7 and the permeate liquid discharge pump 8 are also provided on the permeate liquid pipe 9.

[0059] As a further embodiment of the present invention, a permeate discharge pipe may be provided in parallel between the permeate pipe 9 and the permeate return pipe 11, and the permeate discharge valve 7 and the permeate discharge pump 8 may be provided in the permeate discharge pipe.

[0060] Furthermore, the concentrate discharge assembly includes a concentrate pipe 16, one end of which is connected to the membrane shell 19, and the other end of which is connected to the liquid inlet material assembly.

[0061] Preferably, a concentrate valve 15 is further provided on the concentrate pipe 16 , and the concentrate valve 15 is used to control the connection or disconnection of the concentrate pipe 16 .

[0062] Preferably, the concentrate discharge assembly also includes a concentrate discharge valve 13, a concentrate discharge pump 14, a concentrate reflux pipe 17 and a concentrate reflux valve 18; one end of the concentrate reflux pipe 17 is connected to the concentrate pipe 16, and the other end of the concentrate reflux pipe 17 is connected to the liquid inlet distribution assembly; the concentrate reflux valve 18 is arranged on one end of the concentrate reflux pipe 17 close to the liquid inlet distribution assembly; the concentrate discharge valve 13 and the concentrate discharge pump 14 are also provided on the concentrate pipe 16.

[0063] As a further embodiment of the present invention, a concentrate discharge pipe may be provided in parallel between the concentrate pipe 16 and the concentrate reflux pipe 17, and the concentrate discharge valve 13 and the concentrate discharge pump 14 are provided on the concentrate discharge pipe.

[0064] As a further embodiment of the present invention, the present invention also provides a method for using the above-mentioned material separation device to separate high-concentration liquid (high-concentration liquid includes permeate and concentrate) by the membrane element 5, which specifically includes:

[0065] When the material separation membrane device operates normally, the feed valve 2, the permeate valve 10 and the concentrate valve 15 are all in a normally open state, and the permeate discharge valve 7, the permeate return valve 12 and the concentrate return valve 18 are all in a normally closed state. At this time, the material separation and concentration are connected and operated, and the material separation membrane device continuously concentrates the material; when the feed liquid does not pass through the membrane 19.4, the feed liquid continues to flow along the feed grid 19.5, and flows into the concentrate pipe 16 after passing through multiple membrane elements in sequence, and is collected as a concentrate;

[0066] When it is detected that the permeate concentration exceeds the upper limit requirement and / or the subsequent process of the permeate fails, the material separation membrane device automatically starts the permeate reflux, then the feed valve 2, the permeate discharge valve 7, the permeate reflux valve 12 and the concentrated liquid valve 15 are all opened, and the permeate valve 10, the concentrated liquid discharge valve 13 and the concentrated liquid reflux valve 18 are all closed; at this time, the permeate will flow back to the feed pipe 1 for re-filtration; until the permeate meets the requirements, normal operation will be restored and the next process will be entered;

[0067] When it is detected that the concentration of the concentrated liquid is lower than the upper limit requirement of the concentration and / or the subsequent process of the concentrated liquid fails, the material separation membrane device automatically starts the concentrated liquid reflux, and the feed valve 2, the permeate valve 10, the concentrated liquid discharge valve 13 and the concentrated liquid reflux valve 18 are all opened, and the permeate discharge valve 7, the permeate reflux valve 12 and the concentrated liquid valve 15 are all closed; at this time, the concentrated liquid will flow back to the feed pipe 1 for re-filtration until the concentrated liquid meets the requirements and then resumes normal operation and enters the next process;

[0068] When it is detected that the permeate concentration is lower than the permeate lower limit requirement and the permeate subsequent process is short of material, the material separation membrane device automatically starts the permeate blending, then the feed valve 2, the permeate valve 10, the permeate reflux valve 12 and the concentrated liquid valve 15 are all opened, and the permeate discharge valve 7, the concentrated liquid discharge valve 13 and the concentrated liquid reflux valve 18 are all closed; at this time, the permeate will be mixed with part of the feed, and the permeate water volume and water quality meet the requirements at the same time before entering the next process;

[0069] When it is detected that the concentrate concentration is higher than the upper limit requirement and there is a shortage of materials for the subsequent process of the concentrate, the material separation membrane device automatically starts the blending of the concentrate, then the feed valve 2, the permeate valve 10, the concentrate valve 15 and the concentrate reflux valve 18 are all opened, and the permeate discharge valve 7, the permeate reflux valve 12 and the concentrate discharge valve 13 are all closed; at this time, the concentrate will be mixed with part of the feed, and the concentrate will enter the next process after the water volume and water quality meet the requirements.

[0070] Furthermore, after the separation and concentration of the materials are completed, the present application utilizes the unique design of the discharge pipe (specifically, by arranging the permeate liquid pipe and the permeate liquid discharge pipe in parallel with each other, and connecting the permeate liquid pipe and the permeate liquid discharge pipe with the permeate liquid return pipe at the same time, and then connecting the permeate liquid return pipe with the liquid inlet pipe to form a plurality of closed-loop connected permeate liquid discharge pipe structures; arranging the concentrated liquid pipe and the concentrated liquid discharge pipe in parallel with each other, and connecting the concentrated liquid pipe and the concentrated liquid discharge pipe with the concentrated liquid return pipe at the same time, and then connecting the permeate liquid return pipe with the liquid inlet pipe to form a plurality of closed-loop connected concentrated liquid discharge pipe structures) to reduce material loss. The specific operation is as follows: close the feed valve 2, the permeate valve 10, the permeate return valve 12, the concentrate valve 15 and the concentrate return valve 18, open the permeate discharge valve 7 and the concentrate discharge valve 13, open the permeate discharge pump 8 and the concentrate discharge pump 14 in the pipeline system, and then the materials that are difficult to be discharged from the feed grid 19.5 and the collection pipe 19.1 will be pumped out by the discharge system, and the pumped materials will pass through the permeate pipe 9 and the concentrate pipe 16 respectively, and become the concentrate and the permeate respectively. This method greatly reduces the loss of materials. At this time, it is necessary to control the vacuum degree according to the viscosity of the material, and the recommended negative pressure value is controlled at -20kpa to -100kpa.

[0071] In summary, the material separation membrane device and operation design designed in the present invention are conducive to the efficient treatment of material concentration and separation, improve the treatment yield of material concentration and separation, and are conducive to optimizing the market application of membrane method for material concentration and separation.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A material separation membrane device, characterized in that: It includes a liquid inlet cloth assembly, a membrane element assembly, a permeate discharge assembly and a concentrate discharge assembly; The membrane element assembly comprises a membrane shell (19), a membrane element (5) and a connector (4); the membrane element (5) comprises a plurality of membrane elements arranged at intervals along a liquid inlet direction, and two adjacent membrane elements (5) are connected to each other via a connector (4); a cavity is provided inside the membrane shell (19), and the membrane element (5) and the connector (4) are arranged in the cavity of the membrane shell (19); One end of the liquid inlet material distribution component is connected to the raw liquid storage component, and the other end of the liquid inlet material distribution component is connected to the membrane shell (19) for conveying the raw liquid into the membrane shell; One end of the permeate liquid discharge assembly is connected to the membrane shell (19), and the other end of the permeate liquid discharge assembly is connected to the liquid inlet distribution assembly, so as to output the permeate liquid at the membrane element assembly to the liquid inlet distribution assembly; One end of the concentrated liquid discharge assembly is connected to the membrane shell (19), and the other end of the concentrated liquid discharge assembly is connected to the liquid inlet distribution assembly, so as to transfer the concentrated liquid at the membrane element assembly back to the liquid inlet distribution assembly.

2. The material separation membrane device according to claim 1, characterized in that: The material separation membrane element (5) in the membrane shell (19) comprises a collecting pipe (19.1), a water production channel (19.3), a membrane sheet (19.4), a feed grid (19.5) and an outer shell (19.6); The collecting tube (19.1) is provided with a plurality of membrane elements (5) respectively placed therein, and two adjacent collecting tubes (19.1) are connected in series by a connector (4); The water production channel (19.3), the membrane (19.4), the feed grid (19.5) and the outer shell (19.6) are mutually nested in sequence from the direction close to the collecting pipe (19.1) to the direction far away from the collecting pipe (19.1); The feed liquid arranged in the raw liquid storage component enters the feed grid (19.5) in the membrane element component from the feed distribution component. Under the action of pressure, the feed liquid passes through the membrane (19.4) to become permeate liquid. The permeate liquid enters the collection pipe (19.1) along the produced water flow channel (19.3). The collection pipe (19.1) is connected to the connector (4) and transports the permeate liquid back to the feed distribution component through the permeate discharge component.

3. The material separation membrane device according to claim 2, characterized in that: A liquid inlet sealing ring (19.2) is also provided on one end of the outer casing (19.6) close to the liquid inlet material distribution assembly.

4. The material separation membrane device according to claim 2, characterized in that: A fixer (6) is also provided on one end of the outer shell (19.6) away from the liquid inlet cloth assembly, for fixing the membrane shell (19) and the membrane element (5) to each other.

5. The material separation membrane device according to any one of claims 1 to 4, characterized in that: The liquid feed distribution assembly comprises a feed pipe (1) and a feed distributor (3), one end of the feed pipe (1) is connected to the liquid pumping structure, the other end of the feed pipe (1) is connected to the feed distributor (3), and the feed distributor (3) is connected to the membrane element (5).

6. The material separation membrane device according to claim 5, characterized in that: A feed valve (2) is also provided between the feed pipe (1) and the feed distributor (3).

7. The material separation membrane device according to claim 6, characterized in that: The permeate liquid discharge assembly comprises a permeate liquid pipe (9), one end of the permeate liquid pipe (9) is connected to the membrane shell, and the other end of the permeate liquid pipe (9) is connected to the liquid inlet distribution assembly; The concentrated liquid discharge assembly comprises a concentrated liquid pipe (16), one end of which is connected to the membrane shell (19), and the other end of which is connected to the liquid inlet material distribution assembly.

8. The material separation membrane device according to claim 7, characterized in that: a permeate valve (10) on the permeate pipe (9); A concentrate valve (15) is also provided on the concentrate pipe (16).

9. The material separation membrane device according to claim 8, characterized in that: The permeate liquid discharge assembly further comprises a permeate liquid discharge valve (7), a permeate liquid discharge pump (8), a permeate liquid return pipe (11) and a permeate liquid return valve (12); one end of the permeate liquid return pipe (11) is connected to the permeate liquid pipe (9), and the other end of the permeate liquid return pipe (11) is connected to the liquid inlet distribution assembly; the permeate liquid return valve (12) is arranged on one end of the permeate liquid return pipe (11) close to the liquid inlet distribution assembly; the permeate liquid discharge valve (7) and the permeate liquid discharge pump (8) are also arranged on the permeate liquid pipe (9); The concentrate discharge assembly further comprises a concentrate discharge valve (13), a concentrate discharge pump (14), a concentrate return pipe (17) and a concentrate return valve (18); one end of the concentrate return pipe (17) is connected to the concentrate pipe (16), and the other end of the concentrate return pipe (17) is connected to the liquid inlet distribution assembly; the concentrate return valve (18) is arranged on one end of the concentrate return pipe (17) close to the liquid inlet distribution assembly; the concentrate discharge valve (13) and the concentrate discharge pump (14) are also arranged on the concentrate pipe (16).

10. A method for separating liquid from feed using the material separation membrane device according to claim 9, characterized in that: The details are as follows: When the material separation membrane device operates normally, the feed valve (2), the permeate valve (10) and the concentrate valve (15) are all in a normally open state, and the permeate discharge valve (7), the permeate reflux valve (12), the concentrate discharge valve (13) and the concentrate reflux valve (18) are all in a normally closed state. At this time, the material separation and concentration are connected and the material separation membrane device continuously concentrates the material. When the feed liquid does not pass through the membrane (19.4), the feed liquid continues to flow along the feed grid (19.5), and flows into the concentrate pipe (16) after passing through multiple membrane elements in sequence, and is collected as a concentrate. When it is detected that the permeate concentration exceeds the upper limit requirement and / or a failure occurs in the subsequent process of the permeate, the material separation membrane device automatically starts the permeate reflux, and then the feed valve (2), the permeate discharge valve (7), the permeate reflux valve (12) and the concentrated liquid valve (15) are all opened, and the permeate valve (10), the concentrated liquid discharge valve (13) and the concentrated liquid reflux valve (18) are all closed; at this time, the permeate flows back to the feed pipe (1) and is re-filtered; until the permeate meets the requirements, normal operation is resumed and the next process is entered; When it is detected that the concentration of the concentrated liquid is lower than the upper limit requirement of the concentration and / or a malfunction occurs in the subsequent process of the concentrated liquid, the material separation membrane device automatically starts the concentrated liquid reflux, and then the feed valve (2), the permeate valve (10), the concentrated liquid discharge valve (13) and the concentrated liquid reflux valve (18) are all opened, and the permeate discharge valve (7), the permeate reflux valve (12) and the concentrated liquid valve (15) are all closed; at this time, the concentrated liquid is refluxed to the feed pipe (1) for re-filtration, and normal operation is resumed until the concentrated liquid meets the requirements, and then the next process is entered; When it is detected that the permeate concentration is lower than the permeate lower limit requirement and the permeate subsequent process is short of material, the material separation membrane device automatically starts the permeate blending, and then the feed valve (2), the permeate valve (10), the permeate reflux valve (12) and the concentrated liquid valve (15) are all opened, and the permeate discharge valve (7), the concentrated liquid discharge valve (13) and the concentrated liquid reflux valve (18) are all closed; at this time, the permeate is mixed with part of the feed, and the permeate water volume and water quality meet the requirements at the same time before entering the next process; When it is detected that the concentration of the concentrated liquid is higher than the upper limit requirement of the concentration and the subsequent process of the concentrated liquid is short of material, the material separation membrane device automatically starts the blending of the concentrated liquid, and then the feed valve (2), the permeate valve (10), the concentrated liquid valve (15) and the concentrated liquid return valve (18) are all opened, and the permeate discharge valve (7), the permeate return valve (12) and the concentrated liquid discharge valve (13) are all closed; at this time, the concentrated liquid is mixed with part of the feed, and the water volume and water quality of the concentrated liquid meet the requirements at the same time before entering the next process; When the material separation membrane device ends operation, the permeate discharge valve (7) and the concentrated liquid discharge valve (13) are both in a normally open state, and the feed valve (2), the permeate valve (10), the permeate reflux valve (12), the concentrated liquid valve (15) and the concentrated liquid reflux valve (18) are all in a normally closed state; at this time, the permeate in the collection tube (19.1) in the membrane element (5) is discharged by the permeate discharge pump (8) and collected as the permeate; the concentrated liquid in the feed grid (19.5) in the membrane element (5) is discharged by the concentrated liquid discharge pump (8) and collected as the concentrated liquid.

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