CN110694482B - Rolling type film element - Google Patents
Rolling type film element Download PDFInfo
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- CN110694482B CN110694482B CN201911102532.5A CN201911102532A CN110694482B CN 110694482 B CN110694482 B CN 110694482B CN 201911102532 A CN201911102532 A CN 201911102532A CN 110694482 B CN110694482 B CN 110694482B
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- membrane
- fibers
- water
- raw water
- warp
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- 238000005096 rolling process Methods 0.000 title description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000012528 membrane Substances 0.000 claims abstract description 78
- 239000000835 fiber Substances 0.000 claims abstract description 74
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 5
- -1 polyethylene Polymers 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000001728 nano-filtration Methods 0.000 claims description 5
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000000108 ultra-filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/10—Spiral-wound membrane modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/08—Prevention of membrane fouling or of concentration polarisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/08—Flow guidance means within the module or the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/21—Specific headers, end caps
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a rolled film element, which comprises: the central water producing pipe is provided with an axial inner hole, and the pipe wall is provided with a water through hole communicated with the inner hole; at least one group of water treatment membrane groups wound on the central water production pipe, wherein each group of water treatment membrane groups comprises a membrane folded from the middle, a raw water diversion net arranged in the folded membrane and a produced water diversion cloth arranged on the outer side of the folded membrane, and the inner side surface of the folded membrane and the raw water diversion net jointly form a raw water flow channel; the two end covers are respectively provided with a central hole matched with the inner hole of the central water producing pipe, and a flow guide reinforcing rib is arranged between the central hole and the periphery of each end cover; the raw water diversion net consists of warp fibers and weft fibers, the cross sections of the warp fibers and the weft fibers are elliptical, the long axes of the warp fibers are perpendicular to the membrane, the long axes of the weft fibers are parallel to the membrane, the central axes of the warp and weft fibers are perpendicularly crossed, and the deflection angle of the warp fibers, namely the helix angle alpha of the warp fibers after film winding, is 15-60 degrees.
Description
Technical Field
The invention relates to water treatment equipment, in particular to a core filter component roll-type membrane element in membrane water treatment equipment.
Background
The coiled membrane is one of application forms of separation membranes in membrane water treatment equipment, is different from other membrane forms such as hollow fiber membranes, tubular membranes and flat membranes, and has the advantages of pressure resistance, high filling area, difficult breakage and the like. At present, almost all commercial reverse osmosis and nanofiltration membranes are in roll membrane form because they can withstand high pressures. With the widespread use of reverse osmosis and nanofiltration technologies in various fields of water treatment, roll-type membranes have become one of the most widely used membrane forms.
The final form of the coiled film product is in the form of elements, and the separating film, the raw water diversion net and the produced water diversion cloth are made into a plurality of film bag interlayers by using sealant, and are wound on a central tube, and two ends of the film coil are fixed by two end covers to form a whole. In the using process, the quality of the membrane element is mainly measured by two performance indexes of the retention rate or the desalination rate and the water yield. The rejection rate or desalination rate determines the quality of the produced water and the amount of water produced determines the economics of the membrane element. The larger the water yield is, the more economical the same driving pressure and recovery rate are; or the same water yield, lower driving pressure is needed, and the lower the energy consumption is, the higher the energy efficiency is. At present, the raw water diversion net 3 adopted in the film rolling element is generally composed of warp fibers and weft fibers, as shown in fig. 1, the cross sections of the warp fibers 301 and the weft fibers 302 are circular, the warp fibers and the weft fibers are arranged at a double-layer 90-degree included angle, and raw water flows in the staggered direction under the influence of the staggered of the raw water diversion net fibers when entering the interlayer of the film, so that the raw water is continuously staggered and disturbed between two film surfaces, larger mass transfer resistance and shearing force are generated, mass transfer power is consumed, and the water production efficiency is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-efficiency rolled film element, which adopts the technical scheme that the rolled film element comprises: the central water producing pipe is provided with an axial inner hole, and the pipe wall is provided with a water through hole communicated with the inner hole; at least one group of water treatment membrane groups wound on the central water production pipe, wherein each group of water treatment membrane groups comprises a membrane folded from the middle, a raw water diversion net arranged in the folded membrane and a produced water diversion cloth arranged on the outer side of the folded membrane, and the inner side surface of the folded membrane and the raw water diversion net jointly form a raw water flow channel; the two end covers are respectively provided with a central hole matched with the inner hole of the central water producing pipe, and a flow guide reinforcing rib is arranged between the central hole and the periphery of each end cover; the raw water diversion net consists of warp fibers and weft fibers, the cross sections of the warp fibers and the weft fibers are elliptical, the long axes of the warp fibers are perpendicular to the membrane, the long axes of the weft fibers are parallel to the membrane, the central axes of the warp and weft fibers are perpendicularly crossed, and the deflection angle of the warp fibers, namely the helix angle alpha of the warp fibers after film winding, is 15-60 degrees.
The invention is further characterized in that:
the ratio of the minor axis to the major axis of the cross sections of the warp fibers and the weft fibers of the raw water diversion net is 1/5-1/2, and the length of the major axis is 0.5-5.0 mm.
The raw water diversion net is formed by one-step molding of thermoplastic resin materials.
The thermoplastic resin material is polyethylene or polypropylene or polyethylene terephthalate.
The number of the water treatment membrane groups is 2-50.
The end cover reinforcing ribs are obliquely arranged, an included angle beta formed by the end cover reinforcing ribs and the axis is 15-60 degrees, and the included angle beta is the same as the deflection angle of warp fibers, namely the helix angle alpha, so that water is enabled to keep consistent with the direction of the raw water flow channel when entering the element.
The membranes in the water treatment membrane group are reverse osmosis membranes or nanofiltration membranes or ultrafiltration membranes.
The beneficial effects of the invention are as follows:
because the raw water guide net consists of the warp fibers and the weft fibers, the cross sections of the warp fibers and the weft fibers are elliptical, the long axes of the warp fibers are perpendicular to the membrane, the long axes of the weft fibers are parallel to the membrane, and the central axes of the warp and weft fibers are perpendicularly crossed, when water flows enter the raw water flow passage, the water flows between the two membrane surfaces move forwards in the same-direction wave paths, so that the energy loss caused by the mutual interference of the water flows is greatly reduced, more raw water power is converted into useful osmotic driving force, and the energy utilization rate is high; the spiral angle alpha of the warp fibers after the film is rolled is 15-60 degrees, so that when the film is rolled, the raw water guide net is rolled into a spiral extending structure, the raw water flow passage is also rolled into the spiral extending structure along with the rolling, the water flow of the water flow casting spiral extending flow passage generates a spin force, the mass transfer power is increased, the water flow speed is increased, the water production efficiency can be increased, the trapped substances can be brought out of the film element, and the pollution resistance of the film element is improved; the trapped concentrated water is easy to discharge, so that the concentration polarization phenomenon of the rolled membrane element is greatly reduced, and the stable running water yield of the element is improved.
In addition, the end cover reinforcing ribs are obliquely arranged, and an included angle beta formed by the end cover reinforcing ribs and the axis is 15-60 degrees, which is the same as the deflection angle of the warp fibers, namely the helix angle alpha, so that water is enabled to keep consistent with the direction of the raw water flow channel when entering the element, and the energy loss of water flow can be avoided.
Drawings
FIG. 1 is a schematic view of a prior art raw water diversion screen and membrane;
FIG. 2 is an exploded view of the structure of one embodiment of the present invention;
FIG. 3 is a structural development of the diaphragm set of the embodiment of FIG. 2;
FIG. 4 is a schematic view of the structure of the raw water guide net and membrane of FIG. 3;
Fig. 5 is a schematic structural view and a partial enlarged view of the raw water diversion net in fig. 3.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
Referring to fig. 2-5, a roll-type membrane element comprising: a central water producing pipe 1, wherein the central water producing pipe is provided with an axial inner hole 101, and the pipe wall is provided with a water through hole (not shown) communicated with the inner hole; at least one group of water treatment membrane groups 7 wound on the central water production pipe, wherein each group of water treatment membrane groups 7 comprises a membrane 2 folded from the middle, a raw water guide net 3 arranged in the folded membrane and a produced water guide cloth 4 arranged on the outer side of the folded membrane, and the inner side surface of the folded membrane and the raw water guide net form a raw water flow channel 5 together; two end covers 6, each end cover is provided with a central hole 601 matched with the inner hole 101 of the central water production pipe, and a flow guide reinforcing rib 602 is arranged between the central hole 601 and the periphery of the end cover; the raw water diversion net 3 consists of warp fibers 301 and weft fibers 302, the cross sections of the warp fibers 301 and the weft fibers 302 are elliptical, the long axes of the warp fibers 301 are perpendicular to the membrane 2, the long axes of the weft fibers 302 are parallel to the membrane 2, the central axes of the warp and weft fibers perpendicularly intersect, and the helix angle alpha of the warp fibers after film winding is 30 degrees.
In the embodiment, the ratio of the minor axis to the major axis of the cross sections of the warp fibers 301 and the weft fibers 302 of the raw water diversion net 3 is 1/3, and the length of the major axis is 3.0mm; the raw water guide net is formed by one-step molding of polyethylene; the number of the water treatment membrane groups is 5; the end cover reinforcing ribs 602 are obliquely arranged, and an included angle beta formed by the end cover reinforcing ribs and the axis is 30 degrees, which is the same as the deflection angle of warp fibers, namely a spiral angle alpha, so that water is enabled to keep consistent with the direction of the raw water flow channel 5 when entering the element; the membranes in the water treatment membrane group are reverse osmosis membranes.
In practical application, the deflection angle of the warp fibers, namely the helix angle alpha of the warp fibers of the raw water guide net 3 after film winding, can be selected to be 15 degrees, 45 degrees or 60 degrees; the ratio of the minor axis to the major axis of the cross sections of the raw water diversion net warp fibers 301 and weft fibers 302 can be 1/5 or 1/2, and the length of the major axis can be 0.5 mm or 1.5 mm or 5.0mm; the raw water diversion net 3 can also be formed by polypropylene or polyethylene terephthalate and other thermoplastic resin materials through one-step molding; the number of the water treatment membrane groups can be 2 groups or 10 groups or 20 groups or 30 groups or 50 groups; the end cover reinforcing ribs 602 are obliquely arranged, and the included angle beta formed by the end cover reinforcing ribs and the axis can be 15 degrees, 45 degrees or 60 degrees, which is the same as the deflection angle of warp fibers, namely the helix angle alpha, so that the water is kept consistent with the direction of a raw water flow passage when entering the element; the membranes 2 in the water treatment membrane group can also be selected as nanofiltration membranes or ultrafiltration membranes.
Because the raw water diversion net 3 is composed of the warp fibers 301 and the weft fibers 302, the cross sections of the warp fibers 301 and the weft fibers 302 are elliptical, the long axes of the warp fibers 301 are perpendicular to the membrane 2, the long axes of the weft fibers 302 are parallel to the membrane 2, and the central axes of the warp and weft fibers are perpendicularly crossed, when water flows enter the raw water flow channel 5, the water flows between the two membrane surfaces move forwards in the same direction wave paths, so that energy loss caused by water flow interference is greatly reduced, more raw water power is converted into useful osmotic driving force, and the energy utilization rate is high; the spiral angle alpha of the warp fibers 301 after film rolling is 15-60 degrees, so that when the film is rolled, the raw water guide net 3 is rolled into a spiral extending structure, the raw water flow passage 5 is also rolled into the spiral extending structure, and the water flow flows along the spiral extending flow passage to generate a spin force, so that the mass transfer power is increased, the water flow speed is increased, the water production efficiency is increased, the trapped substances are brought out of the film element, and the pollution resistance of the film element is improved; the trapped concentrated water is easy to discharge, so that the concentration polarization phenomenon of the rolled membrane element is greatly reduced, and the stable running water yield of the element is improved. In addition, the end cover reinforcing ribs 602 are obliquely arranged, and an included angle beta formed by the end cover reinforcing ribs and the axis is 15-60 degrees, which is the same as the deflection angle of the warp fibers 301 of the raw water diversion net, namely the helix angle alpha, so that water is enabled to keep the same with the direction of the raw water flow channel when entering the element, and the energy loss of water flow can be avoided.
Although the invention has been described herein in terms of specific embodiments, the scope of coverage of this invention is not limited thereto, but it is intended to cover all technical modifications, literally or under the doctrine of equivalents, that fall within the scope of the claims.
Claims (7)
1. A rolled film element comprising:
The central water producing pipe is provided with an axial inner hole, and the pipe wall is provided with a water through hole communicated with the inner hole;
At least one group of water treatment membrane groups wound on the central water production pipe, wherein each group of water treatment membrane groups comprises a membrane folded from the middle, a raw water diversion net arranged in the folded membrane and a produced water diversion cloth arranged on the outer side of the folded membrane, and the inner side surface of the folded membrane and the raw water diversion net jointly form a raw water flow channel;
the two end covers are respectively provided with a central hole matched with the inner hole of the central water producing pipe, and a flow guide reinforcing rib is arranged between the central hole and the periphery of each end cover;
The method is characterized in that: the raw water diversion net consists of warp fibers and weft fibers, the cross sections of the warp fibers and the weft fibers are elliptical, the long axes of the warp fibers are perpendicular to the membrane, the long axes of the weft fibers are parallel to the membrane, the central axes of the warp and weft fibers are perpendicularly crossed, and the deflection angle of the warp fibers, namely the helix angle alpha of the warp fibers after film winding, is 15-60 degrees.
2. The roll film element according to claim 1, wherein the ratio of the minor axis to the major axis of the cross sections of the warp fibers and the weft fibers of the raw water diversion net is 1/5 to 1/2, and the length of the major axis is 0.5 to 5.0mm.
3. The roll film element according to claim 1, wherein the raw water guide net is formed by one-step molding of a thermoplastic resin material.
4. A rolled film element according to claim 3, characterised in that the thermoplastic resin material is polyethylene or polypropylene or polyethylene terephthalate.
5. The roll film element of claim 1 wherein the number of sets of water treatment membranes is from 2 to 50.
6. A rolled film element according to claim 1 or claim 2 or claim 3 or claim 4 or claim 5, wherein the deflector ribs are inclined at an angle β of 15-60 ° to the axis, which is the same as the warp fiber deflection angle, i.e. helix angle α, to encourage water to stay in line with the raw water flow path as it enters the element.
7. The roll-to-roll membrane element of claim 6 wherein the membranes in the water treatment membrane group are reverse osmosis or nanofiltration or ultrafiltration membranes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102532.5A CN110694482B (en) | 2019-11-12 | 2019-11-12 | Rolling type film element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102532.5A CN110694482B (en) | 2019-11-12 | 2019-11-12 | Rolling type film element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110694482A CN110694482A (en) | 2020-01-17 |
| CN110694482B true CN110694482B (en) | 2024-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911102532.5A Active CN110694482B (en) | 2019-11-12 | 2019-11-12 | Rolling type film element |
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| Country | Link |
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| CN (1) | CN110694482B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211098438U (en) * | 2019-11-12 | 2020-07-28 | 山东招金膜天股份有限公司 | Roll type membrane element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989097B2 (en) * | 2003-05-16 | 2006-01-24 | National Research Council Of Canada | Feed spacers for filtration membrane modules |
| JP2015205269A (en) * | 2014-04-08 | 2015-11-19 | 東レ株式会社 | Separation membrane structure and separation membrane element |
| CN106039999B (en) * | 2016-07-07 | 2018-10-19 | 北京碧水源膜科技有限公司 | A kind of unidirectional mesh device of reverse-osmosis membrane element and preparation method |
| CN208038066U (en) * | 2017-06-29 | 2018-11-02 | 唐山骏驰水务工程有限公司 | One kind dividing the network of rivers, distributive pipe and water distributor |
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- 2019-11-12 CN CN201911102532.5A patent/CN110694482B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211098438U (en) * | 2019-11-12 | 2020-07-28 | 山东招金膜天股份有限公司 | Roll type membrane element |
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| Publication number | Publication date |
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| CN110694482A (en) | 2020-01-17 |
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