Spiral wound membrane element structure and filtering device comprising same
By installing the grille end cap at the inlet of the feed liquid of the spiral rolling membrane element and the honeycomb end cap at the outlet of the feed liquid of the spiral rolling membrane element, the problem of uneven pressure loss and concentration distribution caused by the series setting of the spiral rolling membrane element is solved, and the reverse osmosis performance and service life of the membrane element are improved.
Patent Information
- Application Number
- CN202510490361.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-06-13
AI Technical Summary
In the prior art, the series arrangement of the spiral roll film element leads to accumulation of pressure loss of feed fluid, loss of water production and desalination rate, and uneven distribution of the feed fluid concentration, resulting in a shortening of the service life of the membrane element.
A structural design is adopted to install a grating end cap on the feed liquid inlet of the membrane element body and a honeycomb end cap on the feed liquid outlet. The grille end cap improves the flow diversion capacity during feeding, and the honeycomb end cap improves the solute mixing capacity during discharge, and evenly distributes the discharge liquid concentration.
It effectively reduces the pressure loss and water production loss of spiral rolled membrane elements, improves reverse osmosis performance, extends the service life of membrane elements, and solves the problem of uneven distribution of feed liquid concentration.
Smart Images
Figure CN120132609A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of spiral wound membrane elements, and particularly to a structure of a spiral wound membrane element and a filtering device containing the structure. Background Art
[0002] In a filtering device, multiple spiral wound membrane elements are usually connected in series. These spiral wound membrane elements all utilize the separation function of the membrane itself to remove certain or multiple substances in the fluid, achieving purposes such as purification, refinement, and concentration. When assembling the spiral wound membrane element, end caps need 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 deforming due to the impact of the feed liquid. However, since multiple spiral wound membrane elements are connected in series, the pressure loss of the feed liquid is greater for the spiral wound membrane element at the back of the series connection. The loss of water production and desalination rate of the spiral wound membrane element is also greater, greatly reducing the reverse osmosis performance. At the same time, the degree of non-uniformity of the feed liquid concentration distribution is also greater, which will cause uneven loading of the spiral wound membrane element, shortening the service life of the spiral wound membrane element.
[0003] In summary, it is necessary to develop a structure of a spiral wound membrane element and a filtering device containing the structure. On the one hand, it solves the problem that the pressure loss of the feed liquid accumulates more and more for the spiral wound membrane element at the back of the series connection in the prior art. On the other hand, it solves the problem that the uneven distribution of the feed liquid concentration (such as too high local concentration) in the prior art leads to the shortening of the service life of the spiral wound membrane element. Summary of the Invention
[0004] The purpose of the present invention is to provide a structure of a spiral wound membrane element and a filtering device containing the structure. The specific technical solutions are as follows:
[0005] In the first aspect, the present invention provides a structure of a spiral wound membrane element, including multiple spiral wound membrane element monomer structures connected in series along the inflow direction of the feed liquid. The spiral wound membrane element monomer structure includes a membrane element body, a grid end cap, and a honeycomb end cap. One end of the membrane element body is the feed liquid inlet, and the other end is the feed liquid outlet. The grid end cap is arranged on the feed liquid inlet, and the honeycomb end cap is arranged on the feed liquid outlet. Or, the honeycomb end cap is arranged on the feed liquid inlet, and the grid end cap is arranged on the feed liquid outlet. Multiple honeycomb holes are spacedly arranged on the honeycomb end cap.
[0006] Optionally, the grid end cap includes a first ring body, a second ring body, and multiple grid bars. The first ring body is coaxially arranged inside the second ring body, and a first circumferential gap is reserved between the two. Each grid bar is spacedly arranged in the first circumferential gap, and one end of each grid bar is connected to the first ring body, and the other end is connected to the second ring body.
[0007] Optionally, the number of the grid bars ranges from 8 to 16 and is evenly distributed in the first circumferential gap.
[0008] Optionally, the honeycomb end cover includes a third ring body, a fourth ring body and an annular honeycomb plate; the third ring body is coaxially arranged in the fourth ring body, and a second circumferential gap is reserved therebetween; the annular honeycomb plate is adaptively arranged in the second circumferential gap, and one end of the annular honeycomb plate is connected to the third ring body and the other end is connected to the fourth ring body; each of the honeycomb holes is arranged at intervals on the annular honeycomb plate.
[0009] Optionally, each of the honeycomb holes is evenly distributed on the annular honeycomb plate; the number of the honeycomb holes ranges from 100 to 210; the shape of the honeycomb holes includes a circle.
[0010] Optionally, the shape of each of the honeycomb holes is specifically a circle, and its diameter size is 4 to 7.5 mm.
[0011] Optionally, the honeycomb end cover further includes a plurality of reinforcing rib plates; each of the reinforcing rib plates is arranged at intervals on the annular honeycomb plate, and one end of each of the reinforcing rib plates is connected to the third ring body and the other end is connected to the fourth ring body, and the main body of each of the reinforcing rib plates.
[0012] Optionally, the number of the reinforcing rib plates ranges from 6 to 10; each of the reinforcing rib plates is evenly distributed on the annular honeycomb plate.
[0013] Optionally, each of the reinforcing rib plates is detachably or fixedly arranged on the annular honeycomb plate.
[0014] In a second aspect, the present invention provides a filtering device containing the spiral wound membrane element structure, and the spiral wound membrane element structure includes a plurality of spiral wound membrane element monomer structures connected in series along the inflow direction of the feed liquid.
[0015] Applying the technical solution of the present invention has at least the following beneficial effects:
[0016] (1) The spiral wound membrane element structure provided by the present invention and the filtration device containing this structure both include multiple spiral wound membrane element monomer structures arranged in series along the inflow direction of the feed liquid. By installing grid end caps on the feed liquid inlets of each membrane element body, the ability to guide the feed liquid during feeding can be improved, thereby minimizing the pressure loss when the feed liquid flows into the spiral wound membrane element structure. The water production loss and desalination rate loss of the membrane element body are also extremely small, improving the reverse osmosis performance of the spiral wound membrane element structure and solving the problem in the prior art that the pressure loss of the feed liquid accumulates more and more in the spiral wound membrane elements at the back of the series connection. By installing honeycomb end caps on the feed liquid outlets of each membrane element body, the ability to mix the solutes of the discharged liquid during discharging can be improved, and the unevenly distributed discharged liquid concentration can be fully mixed evenly. When this discharged liquid flows into the next membrane element body as the feed liquid, the load of the membrane element body is made uniform, extending the service life of the membrane element body. That is, installing honeycomb end caps on the feed liquid outlets of each membrane element body can improve the uniformity of the discharged liquid concentration distribution and alleviate the problem of shortening the service life of the membrane element caused by excessive local concentration. In addition, the grid end caps and honeycomb end caps adopted in the present invention can both fix the membrane element body to prevent the end face of the membrane sheet from deforming due to the impact of the feed liquid.
[0017] (2) By installing honeycomb end caps on the feed liquid inlets of each membrane element body in the present invention, the ability to mix the solutes of the feed liquid during feeding can be improved, and the unevenly distributed feed liquid concentration can be fully mixed evenly, making the load of the membrane element body uniform and extending the service life of the membrane element body. That is, installing honeycomb end caps on the feed liquid inlets of each membrane element body can improve the uniformity of the feed liquid concentration distribution and alleviate the problem of shortening the service life of the membrane element caused by excessive local concentration. By installing grid end caps on the feed liquid outlets of each membrane element body in the present invention, the ability to guide the discharged liquid during discharging can be improved, thereby minimizing the pressure loss when the discharged liquid flows into the next spiral wound membrane element structure. The water production loss and desalination rate loss of the membrane element body are also extremely small, improving the reverse osmosis performance of the next spiral wound membrane element structure and solving the problem in the prior art that the pressure loss of the feed liquid accumulates more and more in the spiral wound membrane elements at the back of the series connection.
[0018] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic 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:
[0020] Figure 1It is a schematic structural diagram of the spiral wound membrane element structure in Example 1;
[0021] Figure 2 It is a schematic structural diagram of the grid end cap in Example 1;
[0022] Figure 3 It is a schematic structural diagram of the honeycomb end cap in Example 1;
[0023] Figure 4 It is a schematic structural diagram of the spiral wound membrane element structure in Example 2;
[0024] Figure 5 It is a schematic structural diagram of the spiral wound membrane element structure in Comparative Example 1;
[0025] Figure 6 It is a schematic structural diagram of the spiral wound membrane element structure in Comparative Example 2;
[0026] Among them, 1. Membrane element body, 2. Grid end cap, 2.1. First ring body, 2.2. Second ring body, 2.3. Grid bars, 3. Honeycomb end cap, 3.1. Honeycomb holes, 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 to 6 the hollow arrow direction indicates the inflow direction of the feed liquid;
[0028] The position of the dotted arrow itself represents the solute distribution position in the solution. The density of the dotted arrow represents a high concentration at that position (compared to the overall solution concentration), and the sparse dotted arrow represents a uniform concentration at that position (but does not represent a low concentration);
[0029] The density of the dotted line in the dotted arrow represents the magnitude of the pressure. The dense dotted line represents a high pressure, and the sparse dotted line represents a low pressure. Detailed implementation manners
[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.
[0031] Example 1:
[0032] See Figures 1 to 3, A spiral wound membrane element structure, comprising a plurality of (such as two 8040 membrane elements (8 inches in diameter and 40 inches in length)) spiral wound membrane element monomer structures arranged in series along the inflow direction of the feed liquid; the spiral wound membrane element monomer structure includes a membrane element body 1, a grid end cap 2 (8 inches in diameter), and a honeycomb end cap 3 (8 inches in diameter); 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 cap 2 is arranged on the feed liquid inlet; the honeycomb end cap 3 is arranged on the feed liquid outlet; a plurality of honeycomb holes 3.1 are arranged at intervals on the honeycomb end cap 3.
[0033] In this Embodiment 1, by installing a grid end cap 2 on the feed liquid inlet of each membrane element body 1, the ability to guide the feed liquid during feeding can be improved, thereby minimizing the pressure loss after the feed liquid flows into the spiral wound membrane element structure. The water production loss and desalination rate loss of the membrane element body 1 are also extremely small, improving the reverse osmosis performance of the spiral wound membrane element structure; by installing a honeycomb end cap 3 on the feed liquid outlet of each membrane element body 1, the ability to mix the solutes of the discharged liquid during discharging can be improved, and the unevenly distributed discharged liquid concentration can be fully mixed evenly. When this discharged liquid flows into the next membrane element body 1 as the feed liquid, the load of the membrane element body 1 is made uniform, extending the service life of the membrane element body 1. In addition, in this Embodiment 1, both the grid end cap 2 and the honeycomb end cap 3 can fix the membrane element body 1 to prevent the end face of the membrane sheet from deforming due to the impact of the feed liquid.
[0034] See Figure 2 , The grid end cap 2 includes 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 inside the second ring body 2.2, and a first circumferential gap is reserved between the two; each of the grid bars 2.3 is arranged at intervals in the first circumferential gap, and one end of each of the grid bars 2.3 is fixedly connected to the first ring body 2.1, and the other end is fixedly connected to 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 circumferential gap, which is convenient for effectively improving the ability to guide the feed liquid during feeding.
[0036] See Figure 3 , The honeycomb end cap 3 includes a third ring body 3.2, a fourth ring body 3.3, and an annular honeycomb plate 3.4; the third ring body 3.2 is coaxially arranged inside the fourth ring body 3.3, and a second circumferential gap is reserved between the two; the annular honeycomb plate 3.4 is adaptively arranged in the second circumferential gap, and one end of the annular honeycomb plate 3.4 is connected to the third ring body 3.2, and the other end is connected to the fourth ring body 3.3; each of the honeycomb holes 3.1 is arranged at intervals on the annular honeycomb plate 3.4.
[0037] In the first annular body 2.1, the second annular body 2.2, the third annular body 3.2 and the fourth annular body 3.3 in the first embodiment 1, they are all communicated with the water production channel in the membrane element body 1, facilitating the guiding of water production to flow out.
[0038] Each of the honeycomb holes 3.1 is uniformly distributed on the annular honeycomb plate 3.4; the number range of the honeycomb holes 3.1 is 198; the shape of the honeycomb holes 3.1 is circular, and the diameter size of each of the honeycomb holes 3.1 is 6.5 mm, facilitating the effective improvement of the solute mixing ability of the feed liquid during discharging.
[0039] The honeycomb end cover 3 further includes a plurality of (specifically six) reinforcing rib plates 3.5; each of the reinforcing rib plates 3.5 is arranged at equal intervals on the annular honeycomb plate 3.4, and one end of each of the reinforcing rib plates 3.5 is connected to the third annular body 3.2, while the other end is connected to the fourth annular body 3.3, and the main body of each of the reinforcing rib plates 3.5.
[0040] Each of the reinforcing rib plates 3.5 is detachably or fixedly arranged on the annular honeycomb plate 3.4, and specifically, it can be selectively fixedly arranged on the annular honeycomb plate 3.4.
[0041] The working principle of the spiral wound membrane element structure is as follows:
[0042] Pressurize the feed liquid and flow it into two spiral wound membrane element monomer structures arranged in series. By installing grid end covers 2 on the feed liquid inlets of each membrane element body 1, the guiding ability of the feed liquid during feeding is improved, and thus the pressure loss of the feed liquid flowing into the 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, improving the reverse osmosis performance of the spiral wound membrane element structure; by installing honeycomb end covers 3 on the feed liquid outlets of each membrane element body 1, the solute mixing ability of the discharged liquid during discharging is improved, and the unevenly distributed discharged liquid concentration can be fully mixed evenly. The discharged liquid flows into the next membrane element body 1 as the feed liquid, making the load of the membrane element body 1 uniform and extending the service life of the membrane element body 1.
[0043] Embodiment 2:
[0044] Different from Embodiment 1, refer 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 by Embodiment 2 is as follows:
[0046] Pressurize the feed liquid and flow it into two spiral wound membrane element monomer structures arranged in series. By installing honeycomb end caps 3 on the feed liquid inlets of each membrane element body 1, the solute mixing ability of the feed liquid during feeding is improved, and the unevenly distributed feed liquid concentration can be fully mixed evenly, so that the load of the membrane element body 1 is uniform and the service life of the membrane element body 1 is extended; by installing grid end caps 2 on the feed liquid outlets of each membrane element body 1, the guiding ability of the discharged liquid during discharging is improved. Furthermore, when the discharged liquid flows into the next spiral wound membrane element structure, the pressure loss is extremely small, and the water production loss and desalination rate loss of the membrane element body 1 are also extremely small, improving the reverse osmosis performance of the next spiral wound membrane element structure.
[0047] Through actual test comparison, it is known that the operation effect of Example 2 is equivalent to that of Example 1.
[0048] Comparative Example 1:
[0049] Different from Example 1, see Figure 5 , grid end caps 2 are installed on the feed liquid outlets of each membrane element body 1.
[0050] Comparative Example 2:
[0051] Different from Example 1, see Figure 6 , honeycomb end caps 3 are installed on the feed liquid inlets of each membrane element body 1.
[0052] From Figure 1 and Figures 5 to 6 it is known that it is difficult to simultaneously have a high guiding ability for the feed liquid during feeding and a high solute mixing ability for the feed liquid during discharging by installing grid end caps 2 on both the feed liquid inlets and feed liquid outlets of each membrane element body 1, or by installing honeycomb end caps 3 on both the feed liquid inlets and feed liquid outlets of each membrane element body 1. In Example 1, grid end caps 2 are installed on the feed liquid inlets of each membrane element body 1, and honeycomb end caps 3 are installed on the feed liquid outlets of each membrane element body 1, which can simultaneously have a high guiding ability for the feed liquid during feeding and a high solute mixing ability for the feed liquid during discharging. Furthermore, on the one hand, it can solve the problem that the pressure loss of the feed liquid accumulates more and more in the spiral wound membrane elements at the back of the series connection in the prior art, improving the reverse osmosis performance of the spiral wound membrane element structure; on the other hand, it can improve the uniformity of the feed liquid concentration distribution and solve the problem that the uneven distribution of the feed liquid concentration (such as too high local concentration) in the prior art leads to the shortening of the service life of the spiral wound membrane element.
[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 were respectively tested as follows: using a 2000 ppm sodium chloride solution as the feed liquid, controlling the feed flow rate to be 10m3 / h, a feed pressure of 10.3 bar, and a system recovery rate (i.e., the percentage of the volume ratio of the water production to the feed liquid) of 30%.
[0054] The test results are 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%, resulting in a 20% reduction in the reverse osmosis performance; and the non-uniformity of the feed liquid concentration was aggravated, leading to 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%, resulting in a 60% increase in the reverse osmosis performance; however, the non-uniformity 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 above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A spiral wound membrane element structure, characterized in that: The invention comprises a plurality of spiral-wound membrane element monomer structures arranged in series along the inflow direction of the feed liquid; 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 feed liquid inlet, and the other end is a feed liquid outlet; the grid end cover (2) is arranged on the feed liquid inlet, and the honeycomb end cover (3) is arranged on the feed liquid outlet; or 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; A plurality of honeycomb holes (3.1) are arranged at intervals on the honeycomb end cover (3).
2. The spiral wound membrane element structure according to claim 1, characterized in that: The grille end cover (2) comprises a first ring body (2.1), a second ring body (2.2) and a plurality of grille 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 of the grille bars (2.3) is arranged in the first annular gap at intervals, and one end of each of the grille bars (2.3) is connected to the first ring body (2.1), and the other end is connected to the second ring body (2.2).
3. The spiral wound membrane element structure according to claim 2, characterized in that: The number of the grid bars (2.3) ranges from 8 to 16, and they are evenly distributed in the first annular gap.
4. The spiral wound membrane element structure according to claim 1, characterized in that: The honeycomb end cover (3) comprises a third ring body (3.2), a fourth ring body (3.3) and an annular 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 third ring body (3.3); the annular honeycomb plate (3.4) is adaptively arranged in the second annular gap, and one end of the annular honeycomb plate (3.4) is connected to the third ring body (3.2), and the other end is connected to the fourth ring body (3.3); and the honeycomb holes (3.1) are arranged at intervals on the annular honeycomb plate (3.4).
5. The spiral wound membrane element structure according to claim 4, characterized in that: The honeycomb holes (3.1) are evenly distributed on the annular honeycomb plate (3.4); the number of the honeycomb holes (3.1) ranges from 100 to 210; and the shape of the honeycomb holes (3.1) includes a circle.
6. The spiral wound membrane element structure according to claim 5, characterized in that: The diameter of each honeycomb hole (3.1) is 4 to 7.5 mm.
7. The spiral wound membrane element structure according to claim 4, characterized in that: The honeycomb end cover (3) also includes a plurality of reinforcing rib plates (3.5); each of the reinforcing rib plates (3.5) is arranged at intervals on the annular honeycomb plate (3.4), and one end of each of the reinforcing rib plates (3.5) is connected to the third ring body (3.2), and the other end is connected to the fourth ring body (3.3), and the main body of each of the reinforcing rib plates (3.5).
8. The spiral wound membrane element structure according to claim 7, characterized in that: The number of the reinforcing rib plates (3.5) ranges from 6 to 10; and the reinforcing rib plates (3.5) are evenly distributed on the annular honeycomb plate (3.4).
9. The spiral wound membrane element structure according to claim 7, characterized in that: Each of the reinforcing rib plates (3.5) can be detachably or fixedly arranged on the annular 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 which are arranged in series along the inflow direction of the feed liquid.