Spiral wound membrane element structure and filtering device comprising same

Abstract

The utility model relates to the technical field of spiral-wound membrane elements, in particular to a spiral-wound membrane element structure and a filtering device comprising the spiral-wound membrane element structure. The spiral-wound membrane element structure comprises a plurality of spiral-wound membrane element monomer structures which are connected in series along the inflow direction of feed liquid; each spiral wound membrane element monomer structure comprises a membrane element body, a grating end cover and a honeycomb end cover; one end of the membrane element body is a feed liquid inlet, and the other end of the membrane element body is a feed liquid outlet; the grating end cover is arranged on the feed liquid inlet, and the honeycomb end cover is arranged on the feed liquid outlet; or, the honeycomb end cover is arranged on the feed liquid inlet, and the grating end cover is arranged on the feed liquid outlet; and a plurality of honeycomb holes are formed in the honeycomb end cover at intervals. The filtering device comprises the spiral wound membrane element structure. According to the utility model, the flow guide capacity to feed liquid during feeding can be improved, and the solute mixing capacity to the feed liquid during discharging can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to spiral-wound membrane element technical field, concretely relates to a spiral-wound membrane element structure and filter device containing this structure. BACKGROUND

[0002] In the filter device, a plurality of spiral-wound membrane elements are usually arranged in series. These spiral-wound membrane elements remove one or more substances in the fluid by using the separation function of the membrane itself, thereby achieving the purposes of purification, purification and concentration. When assembling the spiral-wound membrane element, an end cover needs to be installed at both ends of the spiral-wound membrane element to fix the spiral-wound membrane element and prevent the end face of the membrane from being deformed due to the impact of the feed liquid. However, the plurality of spiral-wound membrane elements are arranged in series, and the pressure loss of the spiral-wound membrane element at the rear end of the series is greater. The water production loss and desalination rate loss of the spiral-wound membrane element are also greater, which greatly reduces the reverse osmosis performance. At the same time, the unevenness of the concentration distribution of the feed liquid is also greater, which will cause the load of the spiral-wound membrane element to be uneven, thereby shortening the service life of the spiral-wound membrane element.

[0003] In summary, it is necessary to develop a spiral-wound membrane element structure and a filter device containing the structure. On the one hand, it solves the problem that the pressure loss of the spiral-wound membrane element at the rear end of the series accumulates more in the prior art. On the other hand, it solves the problem that the uneven concentration distribution of the feed liquid (such as local high concentration) causes the service life of the spiral-wound membrane element to be shortened in the prior art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a spiral-wound membrane element structure and a filter device containing the structure, and the specific technical solutions are as follows:

[0005] In the first aspect, the utility model provides a spiral-wound membrane element structure, which comprises a plurality of spiral-wound membrane element monomer structures arranged in series along the feed liquid inflow direction; the spiral-wound membrane element monomer structure comprises a membrane element body, a grid end cover and a honeycomb end cover; one end of the membrane element body is a feed liquid inlet, and the other end is a feed liquid outlet; the grid end cover is arranged on the feed liquid inlet, and the honeycomb end cover is arranged on the feed liquid outlet; alternatively, the honeycomb end cover is arranged on the feed liquid inlet, and the grid end cover is arranged on the feed liquid outlet; a plurality of honeycomb holes are arranged at intervals on the honeycomb end cover.

[0006] Optionally, the grid end cover comprises a first ring body, a second ring body and a plurality of grid bars; the first ring body is coaxially arranged in the second ring body, and a first annular gap is reserved between the first ring body and the second ring body; each grid bar is arranged at intervals in the first annular gap, and one end of each grid bar is connected with the first ring body, and the other end is connected with the second ring body.

[0007] Optionally, the number of the grid bars ranges from 8 to 16, and the grid bars are evenly distributed in the first annular gap.

[0008] Optionally, the honeycomb end cover comprises a third ring body, a fourth ring body and a ring-shaped honeycomb plate; the third ring body is coaxially arranged in the fourth ring body, and a second annular gap is reserved between the third ring body and the fourth ring body; the ring-shaped honeycomb plate is adaptively arranged in the second annular gap, and one end of the ring-shaped honeycomb plate is connected with the third ring body, and the other end of the ring-shaped honeycomb plate is connected with the fourth ring body; the honeycomb holes are arranged on the ring-shaped honeycomb plate in an interval mode.

[0009] Optionally, the honeycomb holes are evenly distributed on the ring-shaped honeycomb plate; the number of the honeycomb holes ranges from 100 to 210; and the shape of the honeycomb holes comprises a circle.

[0010] Optionally, the shape of the honeycomb holes is a circle, and the diameter of the honeycomb holes ranges from 4 to 7.5 mm.

[0011] Optionally, the honeycomb end cover further comprises a plurality of reinforcing rib plates; the reinforcing rib plates are arranged on the ring-shaped honeycomb plate in an interval mode, and one end of each reinforcing rib plate is connected with the third ring body, and the other end of each reinforcing rib plate is connected with the fourth ring body.

[0012] Optionally, the number of the reinforcing rib plates ranges from 6 to 10; and the reinforcing rib plates are evenly distributed on the ring-shaped honeycomb plate.

[0013] Optionally, each reinforcing rib plate is detachably or fixedly arranged on the ring-shaped honeycomb plate.

[0014] In a second aspect, the utility model provides a filter device containing the spiral-wound membrane element structure, the spiral-wound membrane element structure includes a plurality of spiral-wound membrane element monomer structures that are arranged in series along the feed liquid inflow direction.

[0015] The technical scheme of the utility model has at least the following beneficial effects:

[0016] (1) The spiral-wound membrane element structure and the filtering device with the structure, both of which comprise a plurality of spiral-wound membrane element monomer structures arranged in series along the inflow direction of the feed liquid, and a grating end cover is installed on the feed liquid inlet of each membrane element body, so that the flow guiding capacity for the feed liquid during feeding is improved, and then the pressure loss of the feed liquid flowing into the spiral-wound membrane element structure is extremely small, the water production loss and the desalination rate loss of the membrane element body are also extremely small, the reverse osmosis performance of the spiral-wound membrane element structure is improved, and the problem that the pressure loss of the spiral-wound membrane element is accumulated more and more as the feed liquid flows to the spiral-wound membrane element arranged in series in the prior art is solved; a honeycomb end cover is installed on the feed liquid outlet of each membrane element body, so that the solute mixing capacity for the discharge liquid during discharging is improved, and the unevenly distributed discharge liquid concentration can be fully mixed and evenly distributed, the membrane element body is evenly loaded after the discharge liquid as the feed liquid flows into the next membrane element body, and the service life of the membrane element body is prolonged, that is, the honeycomb end cover is installed on the discharge liquid outlet of each membrane element body, so that the uniformity of the discharge liquid concentration distribution is improved, and the problem that the service life of the membrane element is shortened due to the excessively high local concentration is alleviated. In addition, the grating end cover and the honeycomb end cover can both fix the membrane element body to prevent the deformation of the membrane end face caused by the impact of the feed liquid.

[0017] (2) The spiral-wound membrane element structure and the filtering device with the structure, both of which comprise a plurality of spiral-wound membrane element monomer structures arranged in series along the inflow direction of the feed liquid, and a grating end cover is installed on the feed liquid inlet of each membrane element body, so that the flow guiding capacity for the feed liquid during feeding is improved, and then the pressure loss of the feed liquid flowing into the spiral-wound membrane element structure is extremely small, the water production loss and the desalination rate loss of the membrane element body are also extremely small, the reverse osmosis performance of the spiral-wound membrane element structure is improved, and the problem that the pressure loss of the spiral-wound membrane element is accumulated more and more as the feed liquid flows to the spiral-wound membrane element arranged in series in the prior art is solved; a honeycomb end cover is installed on the feed liquid outlet of each membrane element body, so that the flow guiding capacity for the discharge liquid during discharging is improved, and then the pressure loss of the discharge liquid flowing into the next spiral-wound membrane element structure is extremely small, the water production loss and the desalination rate loss of the membrane element body are also extremely small, the reverse osmosis performance of the next spiral-wound membrane element structure is improved, and the problem that the pressure loss of the spiral-wound membrane element is accumulated more and more as the feed liquid flows to the spiral-wound membrane element arranged in series in the prior art is solved.

[0018] In addition to the above-described objects, features and advantages, the present application has other objects, features and advantages. Hereinafter, the present application will be described in further detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings are provided to explain the present application and, do not limit the present application. In the drawings:

[0020] Figure 1 is a structural schematic diagram of the spiral-wound membrane element structure in Example 1;

[0021] Figure 2 is a structural schematic diagram of the grid end cover in Example 1;

[0022] Figure 3 is a structural schematic diagram of the honeycomb end cover in Example 1;

[0023] Figure 4 is a structural schematic diagram of the spiral-wound membrane element structure in Example 2;

[0024] Figure 5 is a structural schematic diagram of the spiral-wound membrane element structure in Comparative Example 1;

[0025] Figure 6 is a structural schematic diagram of the spiral-wound membrane element structure in Comparative Example 2;

[0026] wherein, 1, membrane element body, 2, grid end cover, 2.1, first ring body, 2.2, second ring body, 2.3, grid strip, 3, honeycomb end cover, 3.1, honeycomb hole, 3.2, third ring body, 3.3, fourth ring body, 3.4, annular honeycomb plate, 3.5, reinforcing rib plate;

[0027] in Figure 1 and Figures 4-6 , the hollow arrow direction represents the feed liquid inflow direction;

[0028] The position of the dashed arrow itself represents the position of the solute in the solution, and the density of the dashed arrow represents that the concentration at this position is large (compared with the overall solution concentration), and the sparse dashed arrow represents that the concentration at this position is uniform (but not small) ;

[0029] The density of the dashed line in the dashed arrow represents the size of the pressure, and the dense dashed line represents the large pressure, and the sparse dashed line represents the small pressure. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0031] Example 1:

[0032] Referring to Figures 1-3A spiral-wound membrane element structure, comprising a plurality of (for example two) spiral-wound membrane element monomer structures arranged in series along the feed liquid inflow direction; the spiral-wound membrane element monomer structure comprises a membrane element body 1, a grid end cover 2 (diameter 8 inches) and a honeycomb end cover 3 (diameter 8 inches); one end of the membrane element body 1 is a feed liquid inlet, and the other end is a feed liquid outlet; the grid end cover 2 is arranged on the feed liquid inlet; the honeycomb end cover 3 is arranged on the feed liquid outlet; a plurality of honeycomb holes 3.1 are arranged at intervals on the honeycomb end cover 3.

[0033] The embodiment 1 can improve the flow guiding capacity of the feed liquid during feeding by installing the grid end cover 2 on the feed liquid inlet of each membrane element body 1, thereby minimizing the pressure loss of the feed liquid flowing into the spiral-wound membrane element structure, and minimizing the water production loss and desalination rate loss of the membrane element body 1, thereby improving the reverse osmosis performance of the spiral-wound membrane element structure; the solute mixing capacity of the discharged liquid during discharging can be improved by installing the honeycomb end cover 3 on the feed liquid outlet of each membrane element body 1, so that the unevenly distributed discharged liquid concentration can be fully mixed and evenly distributed, and the discharged liquid as the feed liquid flowing into the next membrane element body 1 can evenly load the membrane element body 1, thereby prolonging the service life of the membrane element body 1. In addition, the grid end cover 2 and the honeycomb end cover 3 can both fix the membrane element body 1 to prevent the deformation of the membrane sheet end face due to the impact of the feed liquid.

[0034] Referring to Figure 2 The grid end cover 2 comprises a first ring body 2.1, a second ring body 2.2 and a plurality of grid bars 2.3; the first ring body 2.1 is coaxially arranged in the second ring body 2.2, and a first annular gap is reserved therebetween; each of the grid bars 2.3 is arranged at intervals in the first annular gap, and one end of each of the grid bars 2.3 is fixedly connected with the first ring body 2.1, and the other end is fixedly connected with the second ring body 2.2.

[0035] The number of the grid bars 2.3 ranges from 12, and they are evenly distributed in the first annular gap, thereby effectively improving the flow guiding capacity of the feed liquid during feeding.

[0036] Referring to Figure 3 The honeycomb end cover 3 comprises a third ring body 3.2, a fourth ring body 3.3 and a ring-shaped honeycomb plate 3.4; the third ring body 3.2 is coaxially arranged in the fourth ring body 3.3, and a second annular gap is reserved therebetween; the ring-shaped honeycomb plate 3.4 is adaptively arranged in the second annular gap, and one end of the ring-shaped honeycomb plate 3.4 is connected with the third ring body 3.2, and the other end is connected with the fourth ring body 3.3; each of the honeycomb holes 3.1 is arranged at intervals on the ring-shaped honeycomb plate 3.4.

[0037] The first ring body 2.1, the second ring body 2.2, the third ring body 3.2 and the fourth ring body 3.3 in the embodiment 1 are communicated with the water production channel in the membrane element body 1, which is convenient for guiding the water to flow out.

[0038] The honeycomb holes 3.1 are uniformly distributed on the annular honeycomb plate 3.4; the number of the honeycomb holes 3.1 ranges from 198; the shape of the honeycomb holes 3.1 is circular, and the diameter of each honeycomb hole 3.1 is 6.5 mm, which is convenient for effectively improving the solute mixing capacity of the feed liquid during discharging.

[0039] The honeycomb end cover 3 further comprises a plurality of (specifically six) reinforcing rib plates 3.5; each reinforcing rib plate 3.5 is uniformly spaced on the annular honeycomb plate 3.4, and one end of each reinforcing rib plate 3.5 is connected with the third ring body 3.2, and the other end is connected with the fourth ring body 3.3, and the main body of each reinforcing rib plate 3.5.

[0040] Each reinforcing rib plate 3.5 can be detachably or fixedly arranged on the annular honeycomb plate 3.4, and can be fixedly arranged on the annular honeycomb plate 3.4.

[0041] The working principle of the spiral-wound membrane element structure is as follows:

[0042] The feed liquid is pressurized to flow into the two spiral-wound membrane element monomer structures arranged in series, and the grid end cover 2 is installed on the feed liquid inlet of each membrane element body 1 to improve the flow guiding capacity of the feed liquid during feeding, so that the pressure loss of the feed liquid flowing into the spiral-wound membrane element structure is very small, and the water production loss and desalination rate loss of the membrane element body 1 are also very small, thereby improving the reverse osmosis performance of the spiral-wound membrane element structure; the honeycomb end cover 3 is installed on the feed liquid outlet of each membrane element body 1 to improve the solute mixing capacity of the discharged liquid during discharging, and the unevenly distributed discharged liquid concentration can be fully mixed and evenly distributed, and the discharged liquid as the feed liquid flows into the next membrane element body 1 to make the load of the membrane element body 1 uniform, thereby prolonging the service life of the membrane element body 1.

[0043] Embodiment 2:

[0044] Different from embodiment 1, referring to Figure 4 , the honeycomb end cover 3 is arranged on the feed liquid inlet, and the grid end cover 2 is arranged on the feed liquid outlet.

[0045] The working principle of the spiral-wound membrane element structure provided in embodiment 2 is as follows:

[0046] The feed liquid is pressurized into two spiral-wound membrane element single structures arranged in series. The solute mixing capacity of the feed liquid during feeding is improved by installing the honeycomb end cap 3 on the feed liquid inlet of each membrane element body 1. The unevenly distributed feed liquid concentration can be fully mixed and evenly distributed, so that the membrane element body 1 is evenly loaded, and the service life of the membrane element body 1 is prolonged. The flow guiding capacity of the discharged liquid during discharging is improved by installing the grid end cap 2 on the feed liquid outlet of each membrane element body 1. The pressure loss of the discharged liquid flowing into the next spiral-wound membrane element structure is extremely small, and the water production loss and desalination rate loss of the membrane element body 1 are also extremely small. The reverse osmosis performance of the next spiral-wound membrane element structure is improved.

[0047] It is known through actual test comparison that the operation effect of Example 2 is equivalent to that of Example 1.

[0048] Comparative Example 1:

[0049] Different from Example 1, referring to Figure 5 the grid end cap 2 is installed on the feed liquid outlet of each membrane element body 1.

[0050] Comparative Example 2:

[0051] Different from Example 1, referring to Figure 6 the honeycomb end cap 3 is installed on the feed liquid inlet of each membrane element body 1.

[0052] It is known from Figure 1 and Figures 5-6 that it is difficult to have both high flow guiding capacity of the feed liquid during feeding and high solute mixing capacity of the feed liquid during discharging by installing the grid end cap 2 on the feed liquid inlet and the feed liquid outlet of each membrane element body 1 or by installing the honeycomb end cap 3 on the feed liquid inlet and the feed liquid outlet of each membrane element body 1. However, in the present Example 1, the grid end cap 2 is installed on the feed liquid inlet of each membrane element body 1, and the honeycomb end cap 3 is installed on the feed liquid outlet of each membrane element body 1. Therefore, both high flow guiding capacity of the feed liquid during feeding and high solute mixing capacity of the feed liquid during discharging can be achieved. In this way, on the one hand, the problem of pressure loss accumulation of the feed liquid in the spiral-wound membrane element arranged in series can be solved, and the reverse osmosis performance of the spiral-wound membrane element structure is improved. On the other hand, the uniformity of the feed liquid concentration distribution can be improved, and the problem of shortened service life of the spiral-wound membrane element caused by unevenly distributed feed liquid concentration (such as local high concentration) can be solved.

[0053] The spiral-wound membrane element structures (the membrane element body 1 is a conventional brackish water membrane element) in Example 1 and Comparative Examples 1-2 are respectively tested as follows: 2000 ppm sodium chloride solution is used as the feed liquid, the feed flow rate is controlled to be 10 m3 The feed pressure was 10.3 bar and the system recovery (i.e. the percentage of the volume of the feed liquid that is produced as water) was 30%.

[0054] The test results were as follows:

[0055] Compared with Comparative Example 1, the cumulative pressure loss of the spiral-wound membrane element structure in Example 1 increased by 20%, thus causing a 20% decrease in the reverse osmosis performance; and the unevenness of the feed liquid concentration was aggravated, resulting in a 20%-30% reduction in the service life of the spiral-wound membrane element.

[0056] Compared with Comparative Example 2, the cumulative pressure loss of the spiral-wound membrane element structure in Example 1 decreased by 60%, thus causing a 60% increase in the reverse osmosis performance; but the unevenness of the feed liquid concentration was improved, resulting in a 10%-15% increase in the service life of the spiral-wound membrane element.

[0057] The preferred embodiments of the present application have been described above by way of example only, not for limitation, and various changes and modifications can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spiral wound membrane element structure, characterized by, The application relates to a spiral-wound membrane element structure, which comprises a plurality of spiral-wound membrane element monomer structures arranged in series along the feeding liquid inflow direction; the spiral-wound membrane element monomer structure comprises a membrane element body (1), a grid end cover (2) and a honeycomb end cover (3); one end of the membrane element body (1) is a feeding liquid inlet, and the other end is a feeding liquid outlet; the grid end cover (2) is arranged on the feeding liquid inlet, and the honeycomb end cover (3) is arranged on the feeding liquid outlet; or the honeycomb end cover (3) is arranged on the feeding liquid inlet, and the grid end cover (2) is arranged on the feeding liquid outlet. A plurality of honeycomb holes (3.1) are arranged on the honeycomb end cover (3) in a spaced manner.

2. The spiral wound membrane element structure of claim 1, wherein, The grid end cover (2) comprises a first ring body (2.1), a second ring body (2.2) and a plurality of grid bars (2.3); the first ring body (2.1) is coaxially arranged in the second ring body (2.2), and a first annular gap is reserved between the two; each grid bar (2.3) is arranged in the first annular gap in a spaced manner, and one end of each grid bar (2.3) is connected with the first ring body (2.1), and the other end is connected with the second ring body (2.2).

3. The spiral wound membrane element structure of claim 2, wherein, The number of the grid bars (2.3) ranges from 8 to 16, and the grid bars are uniformly distributed in the first annular gap.

4. The spiral wound membrane element structure of claim 1, wherein, The honeycomb end cover (3) comprises a third ring body (3.2), a fourth ring body (3.3) and a ring-shaped honeycomb plate (3.4); the third ring body (3.2) is coaxially arranged in the fourth ring body (3.3), and a second annular gap is reserved between the two; the ring-shaped honeycomb plate (3.4) is adaptively arranged in the second annular gap, and one end of the ring-shaped honeycomb plate (3.4) is connected with the third ring body (3.2), and the other end is connected with the fourth ring body (3.3); each honeycomb hole (3.1) is arranged on the ring-shaped honeycomb plate (3.4) in a spaced manner.

5. The spiral wound membrane element structure of claim 4, wherein, Each honeycomb hole (3.1) is uniformly distributed on the ring-shaped honeycomb plate (3.4); the number of the honeycomb holes (3.1) ranges from 100 to 210; the shape of the honeycomb holes (3.1) comprises a circular shape.

6. The spiral wound membrane element structure of claim 5, wherein, The diameter size of each honeycomb hole (3.1) is 4-7.5 mm.

7. The spiral wound membrane element structure of claim 4, wherein, The honeycomb end cover (3) further comprises a plurality of reinforcing rib plates (3.5); each reinforcing rib plate (3.5) is arranged on the ring-shaped honeycomb plate (3.4) in a spaced manner, one end of each reinforcing rib plate (3.5) is connected with the third ring body (3.2), the other end is connected with the fourth ring body (3.3), and the main body of each reinforcing rib plate (3.5).

8. The spiral wound membrane element structure of claim 7, wherein, The number of the reinforcing rib plates (3.5) ranges from 6 to 10; each reinforcing rib plate (3.5) is uniformly distributed on the ring-shaped honeycomb plate (3.4).

9. The spiral wound membrane element structure of claim 7, wherein, Each reinforcing rib plate (3.5) can be detachably or fixedly arranged on the ring-shaped honeycomb plate (3.4).

10. A filtration device comprising the spiral-wound membrane element structure according to any one of claims 1 to 9, characterized in that The spiral-wound membrane element structure comprises a plurality of spiral-wound membrane element monomer structures arranged in series along the feeding liquid inflow direction.

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