CN113244773A - Concentrated water separation net for roll type membrane element - Google Patents
Concentrated water separation net for roll type membrane element Download PDFInfo
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- CN113244773A CN113244773A CN202110668884.8A CN202110668884A CN113244773A CN 113244773 A CN113244773 A CN 113244773A CN 202110668884 A CN202110668884 A CN 202110668884A CN 113244773 A CN113244773 A CN 113244773A
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/06—External membrane module supporting or fixing means
Abstract
The application provides a dense water separation net for a roll-type membrane element, which comprises two groups of net wires, wherein the two groups of net wires are respectively represented by an alpha group and a beta group, and the net wires in the alpha group and the net wires in the beta group are interwoven into a net structure; at least one group of the net wires comprises net wires with different diameters; in the same group of wires containing wires with different diameters, at least one wire with a diameter different from the maximum diameter is arranged between two adjacent wires with the maximum diameter. The concentrated water separation net for the roll-type membrane element can ensure the supporting performance of the concentrated water separation net and reduce the number of nodes for contacting the membrane with the concentrated water separation net, so that the damage of the concentrated water separation net to the membrane in the membrane element rolling process is reduced; meanwhile, the configuration of the net wires with different diameters can reduce the pressure drop values at two ends of the membrane element and reduce the operation energy consumption of the membrane element.
Description
Technical Field
The application relates to the technical field of membrane separation, in particular to a concentrated water separation net for a roll type membrane element.
Background
The membrane technology is widely applied to the fields of pure water preparation, reclaimed water reuse, sewage treatment, seawater desalination and the like. The spiral-wound membrane element is one of the most widely applied structural types in the current membrane products, and is the main membrane form of commercial reverse osmosis and nanofiltration membrane elements. The concentrate spacer net is a core component affecting the performance of the membrane element and plays a key role in the roll-type membrane element, such as isolating the membrane sheet to provide a fluid flow passage and promoting fluid mixing, etc. Two key technical indexes of the membrane element are respectively desalination rate and water yield, and the structure of the concentrated water separation net can greatly influence the performance of the membrane element.
At present, a commercial concentrated water separation net for a roll-type membrane element is mainly formed by interlacing parallel net wires arranged in different directions, and nodes formed by interlacing the parallel net wires in different directions have an isolation effect on a membrane. However, the membrane functional layer is damaged to a certain extent due to the extrusion of the convex node to the membrane, and the desalination rate of the membrane element is reduced. In some related technologies, the number of nodes in a unit area is reduced by reducing the arrangement density of the parallel net wires, so that the damage of the nodes to the membrane sheet can be reduced, but the self-supporting strength of the concentrated water separation net is also reduced, and the rolled membrane element is damaged in the operation process.
Disclosure of Invention
Based on the not enough of current design, this application provides a formula of book membrane element separates net with dense water, can guarantee the support performance that dense water separates the net simultaneously, can reduce the node quantity that diaphragm and dense water separated the net contact again, reduces membrane both sides pressure drop value to reduce dense water and separate the net and roll up the system process at the membrane element and damage the diaphragm.
A dense water separation net for a roll-type membrane element comprises two groups of net wires which are respectively expressed by an alpha group and a beta group, and the net wires in the alpha group and the net wires in the beta group are interwoven into a net-shaped structure; at least one group of the net wires comprises net wires with different diameters; at least one net wire with the diameter not the largest is arranged between two adjacent net wires with the diameter the largest in the same group of net wires with different diameters.
It should be explained that in most embodiments, when different diameter wires are included in the same set of wires, there are at least two wires of the largest diameter. However, in some possible embodiments, the same set of wires includes two wires with different diameters, and only one wire with the largest diameter is included, and the set of wires should be regarded as a set of wires with the same diameter. In other possible embodiments, the same set of wires may include three or more wires with different diameters, and only one wire with the largest diameter may be used, and the wire with the largest diameter and the wire with the second largest diameter should be regarded as wires with the same diameter.
The raised nodes are different in size when the meshes with different diameters are crossed, and the concentrated water separation net is clamped between the two membranes, so that the largest node plays a role in supporting the two membranes. The node of the intersection bulge of the mesh wire with the smaller diameter and other mesh wires is necessarily smaller than the node of the intersection bulge of the two largest mesh wires, so that the rest nodes except the largest node are not directly extruded with the two sheets of films. The mode changes phases to reduce nodes of the membrane which are in direct contact with the dense water separation net, but the arrangement density of the net wires is not reduced, when the net wires are under pressure, other nodes except the maximum nodes can still support the membrane, and the pressure drop values of the two sides of the membrane are reduced.
In some possible embodiments, in the same group of wires containing wires of different diameters, the wires of different diameters constitute an arrangement unit, and the arrangement unit is repeated.
It should be explained that the arrangement is also within the scope of protection of the arrangement described above when the arrangement is incomplete close to the edges of the concentrate spacer.
The node distribution of the dense water separation net is more uniform by the alternative arrangement mode, and the pressure drop values at two sides of the membrane are more favorably reduced.
In some possible embodiments, the mesh diameter is
The unit of the length of the film is mm,
(ii) a In the same group of wires containing wires of different diameters, the largest diameter
And minimum diameter
Satisfy the relationship of
。
Maximum diameter
And minimum diameter
If the ratio of (a) is too large, the nodes on the dense water separation net are too uneven, and local stress on two sides of the membrane is uneven, so that the membrane is damaged.
In some possible embodiments, the wires in group a are parallel to each other; the meshes in the beta group are parallel to each other.
In some possible embodiments, the distances between parallel and adjacent wires are all equal, said distance being
(ii) a Said distance
And said maximum diameter
Is full ofFoot
。
In some possible embodiments, the angle between the wires in the a group and the wires in the β group is 30 ° to 90 °.
In some possible embodiments, the concentrate spacer screen is located inside the rolled membrane element, sandwiched between two sheets of front-facing membrane sheets, for conducting the fluid flowing through the rolled membrane element; the included angle between the mesh in the alpha group or the mesh in the beta group and the water inlet direction of the flow channel of the spiral membrane element is 30-60 degrees.
The larger the angle formed by the fluid inflow direction and the mesh is, the larger the fluid flow resistance is, so that the included angle between the fluid inflow direction and the mesh is an acute angle; in addition, because the grid consists of two groups of crossed mesh wires, the included angle between the fluid water inlet direction and the mesh wires cannot be too low.
In some possible embodiments, the diameter of the mesh in the α group is the same as the diameter of the mesh in the β group.
In some possible embodiments, the thickness of the concentrated water barrier web is 0.2-2.5 mm.
In some possible embodiments, the mesh material is polypropylene or polyethylene.
To sum up, the dense water that is used for book formula membrane element that this application provided separates the net can guarantee the support performance that dense water separates the net simultaneously, can reduce the diaphragm again and dense water and separate the node quantity that the net contacted to reduce dense water and separate the net and roll up the system process at the membrane element and damage the diaphragm. In addition, the small nodes in the concentrated water separation net provided by the application can also play a role in disturbing the fluid flowing through the membrane element, so that the concentration polarization phenomenon in the fluid in the membrane is eliminated, and the desalination rate of the membrane element is greatly improved; while reducing the pressure drop value of the membrane element.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a concentrated water separation net for a roll-type membrane element according to an embodiment of the present application;
FIG. 2 is a longitudinal cross-sectional view of the concentrate spacer screen of FIG. 1;
wherein, 1, alpha group, 2, beta group; A. the net wires with larger diameter, B, the net wires with smaller diameter.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, 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, and it should be understood that the drawings in the embodiments of the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The devices or materials used in the present application are commercially available from conventional sources and, unless otherwise indicated, are used in the conventional manner in the art or in the product specification. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present application. The preferred methods and materials described in this application are exemplary only.
Example 1
Referring to fig. 1 and 2, a dense water-barrier net for roll-type membrane element provided in example 1 of the present application includes two sets of net wires, which are respectively represented by α set (1) and β set (2), the net wires in α set (1) and the net wires in β set (2) are interlaced to form a net structure, and particularly, the α set (1) and the β set (2) include net wires with two different diameters; in the same group of the net wires, a net wire which is not the largest diameter is arranged between two adjacent net wires with the largest diameter.
Wherein, the diameter combination and arrangement mode of the mesh in the alpha group (1) and the mesh in the beta group (2) are the same, and the maximum diameter of the mesh is the same
=0.60mm, minimum diameter of mesh
=0.35 mm. In the embodiment, the meshes in the alpha group (1) are parallel to each other, the meshes in the beta group (2) are parallel to each other, and the distance between the parallel and adjacent meshes
=2.4mm, and the mesh angle between the two sets of meshes is 90 degrees. In this embodiment, the thickness of the separation net is 0.86mm, and the material of the net wire is polypropylene.
Example 2
The difference between example 2 and example 1 is that the wires in the a group (1) and the wires in the β group (2) each comprise three different diameters, 0.60mm, 0.50mm and 0.35mm from large to small.
Example 3
Compared with the embodiment 1, the difference of the embodiment 3 is that the diameters of the mesh wires are 0.60mm and 0.40mm from large to small; the distance between the meshes is 3.6 mm; the mesh included angle between the two groups of meshes is 80 degrees.
Example 4
Compared with the embodiment 1, the difference of the embodiment 4 is that the diameters of the mesh wires are 0.50mm and 0.60mm from large to small; the distance between the meshes is 4.8 mm; the mesh wire included angle between the two groups of mesh wires is 70 degrees; the thickness of the separation net is 0.92mm
In embodiments 1-4, the wires in group a (1) and the wires in group β (2) each comprise wires of different diameters, and in other embodiments, only the wires in group a (1) or only the wires in group β (2) comprise wires of different diameters, and the wires of the other group may all be wires of the same diameter.
In examples 1-4, different diameter wires of the same set of wires were arranged alternately. Referring specifically to fig. 2, in example 1, there are two kinds of mesh wires with different diameters, where the mesh wire with the larger diameter is a, and the mesh wire with the smaller diameter is B, then the arrangement of the same group of mesh wires in example 1 is as shown in fig. 2: a.... ababab.. said.a.an alternating arrangement, wherein AB is one arrangement unit, and the arrangement units are repeatedly arranged. In example 2, three kinds of mesh wires having different diameters are used, and the mesh wires have diameters a, b, and c, respectively, and are arranged in such a manner that abc is.
In other specific embodiments, the two kinds of mesh wires with different diameters in the same group of mesh wires may be sorted by: abbabbabbabbabba. In still another specific embodiment, the three different diameters of the same group of meshes may be arranged in a manner that is not exhaustive, and other arrangements may be formed according to the design idea of the present application, and all arrangements embodying the design idea of the present application are within the protection scope of the present application.
In examples 1 to 4, the maximum diameter of the mesh
=0.60mm, minimum diameter
=0.35 mm. In other specific embodiments, the mesh diameter is in mm
Can be in the interval
Any value of (1). Preferably, the maximum diameter
And minimum diameter
Satisfy the relationship of
. In the same group of net wires, the ratio of the maximum diameter of the net wires to the minimum diameter of the net wires is too large, the height difference between the maximum node and the minimum node of the dense water separation net is too large, when the fluid pressure is too large, the small node cannot effectively share the membrane pressure to the maximum extent, so that the deformation and the damage of the net wires are caused, and the effect of reducing the membrane damage is slightly poor.
In examples 1-4, the wires in group α (1) were parallel to each other, and the wires in group β (2) were also parallel to each other. In other specific embodiments, there may be arrangements in which the same set of wires are not absolutely parallel.
In examples 1-4, the distances between parallel and adjacent wires were all equal; in examples 1-2 the distance is
=2.4 mm; in the case of the embodiment 3, the following,
=3.6mm；in the case of the embodiment 4, the following,
=4.8 mm. In other specific embodiments, the distance L may also be other values, but preferably the distance L is other than the same value
And said maximum diameter
The relationship satisfies
。
And
if the ratio is too small, the dense water separation net wires are too dense, and the flow guide effect is not good;
and
if the ratio of (a) to (b) is too large, the meshes of the concentrated water separation net are too sparse, and the supporting effect on the membrane is not good enough.
In examples 1-4, the concentrate spacer screen is located inside the rolled membrane element, sandwiched between two sheets of frontally opposite membrane sheets, for conducting the fluid through the rolled membrane element. The net wires in the alpha group (1) are transverse net wires, the net wires in the beta group (2) are longitudinal net wires, and the included angle between the net wires in the alpha group (1) and the water inlet direction of the spiral membrane element flow channel is 45o. Of course, in other specific embodiments, the included angle between the mesh wires in the beta group (2) and the water inlet direction of the flow channel of the roll-type membrane element can be 45oOr other angles are possible, but preferably the mesh in the alpha group (1) or the mesh and the wound membrane element in the beta group (2)The included angle between the water inlet directions of the element flow channels is 30-60 degrees.
In example 1-2, the thickness of the concentrated water barrier web was 0.86 mm. Of course, in other specific embodiments, the thick water barrier net can have other thicknesses, and preferably, the thickness of the thick water barrier net is in the range of 0.2-2.5 mm.
In example 1-2, the mesh material was polypropylene. Of course, in other embodiments, the mesh may be made of polyethylene.
The raised nodes are different in size when the meshes with different diameters are crossed, and the concentrated water separation net is clamped between the two membranes, so that the largest node plays a role in supporting the two membranes. The node of the intersection bulge of the mesh wire with the smaller diameter and other mesh wires is necessarily smaller than the node of the intersection bulge of the two largest mesh wires, so that the rest nodes except the largest node are not directly extruded with the two sheets of films. The mode phase change reduces nodes of the membrane which are directly contacted with the dense water separation net, but does not reduce the arrangement density of the net wires, and when the net wires are stressed, other nodes except the maximum nodes can still support the membrane. Therefore, the concentrated water separation net for the roll-type membrane element provided by the embodiment can ensure the supporting performance of the concentrated water separation net, and can reduce the number of nodes of the membrane in contact with the concentrated water separation net, so that the damage of the concentrated water separation net to the membrane in the membrane element rolling process is reduced.
Compared with the related technologies, for example, the nodes are processed by hot melting, extrusion or fine grinding processes, the technical scheme provided by the embodiment omits the fussy working procedures, and the production cost of the separation net is greatly reduced. Particularly, nodes processed by a hot melting, extruding or fine grinding process in the related art are all flat and cannot disturb fluid flowing through the membrane element, and the smaller nodes in the concentrated water separation net provided by the embodiment can also disturb the fluid flowing through the membrane element, so that the concentration polarization phenomenon in the fluid in the membrane is eliminated, and the desalination rate of the membrane element is greatly improved.
In order to further prove the technical effect of the technical scheme of the application, the application provides comparative examples 1-2 on the basis of examples 1-4. Of these, comparative example 1 differs from example 1 only in that: all the mesh wires in comparative example 1 had a diameter of 0.60 mm; comparative example 2 differs from example 1 in that: all the wires in comparative example 2 had a diameter of 0.6mm and the spacing between the wires was 6.0 mm.
The technical effects of examples 1 to 4 and comparative examples 1 to 2 were evaluated by two indexes of salt rejection of the membrane element and pressure drop (pressure drop value) of the feed water and the concentrate. Wherein, the salt rejection rate = (original salt concentration-salt concentration after membrane filtration) ÷ original salt concentration × 100%; the pressure drop of the inlet water and the concentrated water is a main factor of membrane damage, and the larger the pressure drop value is, the more easily the membrane is damaged. The septum effectiveness test method in examples 1-4 and comparative examples 1-2 is as follows:
step one, rolling 8040 type membrane elements with the separation net in examples 1-4 and comparative examples 1-2, respectively. Wherein the membrane is selected to have an ideal salt rejection of 99.6% and an ideal water production of 26GFD (GFD is the flux unit per surface, gallons per square foot per day).
And step two, carrying out a desalination effect test on the membrane element prepared in the step one by adopting the same test conditions. The test conditions are specifically as follows: the concentration of raw water sodium chloride is 2000ppm (namely the concentration of raw salt), the water temperature is 25 ℃, the water inlet pressure is 225psi, and the recovery rate is 15%.
Step three, recording the salt rejection rate of the membrane elements in each example and comparative example, and the pressure drop (pressure drop value) of the feed water and the concentrate.
The experimental data obtained after the above technical effect test method was performed are shown in table 1.
TABLE 1
As can be seen from the data in Table 1:
compared with the membrane element prepared in the mode of the comparative example 1, the membrane element has the advantages that the salt rejection rate is greatly reduced, the pressure drop value is large, and the damage degree to the membrane is large;
② comparative example 2 the element pressure drop value was reduced by simply increasing the mesh pitch on the basis of comparative example 1, but the salt rejection of the membrane element was further reduced.
Thirdly, the concentrated water separation net provided by the embodiment 1 to 4 can improve the desalination rate of the membrane element, reduce the pressure drop value of the membrane element and reduce the damage to the membrane.
The terminology used in the above-described embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the various embodiments of the present application below, "at least one" means one, two, or more than two.
Reference throughout this specification to "some particular embodiments," "some possible embodiments," or "the application" etc., means that a particular feature, structure, or characteristic described in connection with the embodiments is included in one or more embodiments of the application. Thus, appearances of the phrases "in particular embodiments," "in some possible embodiments," or "the application" or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise. The terms "first" and "second" described in the present specification are used only for expressing different components of different regions, have no special meanings in technical features, and may be expressed by using other terms.
The embodiments described above are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application, but is merely representative of selected embodiments of the application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. Moreover, all other embodiments that can be made available by a person skilled in the art without making any inventive step based on the embodiments of the present application shall fall within the scope of protection of the present application.
Claims (10)
1. A dense water separates net for rolling up formula membrane element which characterized in that: comprises two groups of mesh wires which are respectively expressed by an alpha group and a beta group, and the mesh wires in the alpha group and the mesh wires in the beta group are interwoven into a mesh structure; at least one group of the net wires comprises net wires with different diameters; at least one net wire with the diameter not the largest is arranged between two adjacent net wires with the diameter the largest in the same group of net wires with different diameters.
2. The concentrate spacer screen of claim 1, wherein: in the same group of net wires containing net wires with different diameters, the net wires with different diameters form a certain arrangement unit, and the net wires are repeatedly arranged according to the arrangement unit.
3. The concentrate spacer screen of claim 1, wherein: the diameter of the mesh is
The unit of the length of the film is mm,
(ii) a In the same group of wires containing wires of different diameters, the largest diameter
And minimum diameter
Satisfy the relationship of
。
4. The concentrate spacer screen of claim 3, wherein: the mesh wires in the alpha group are mutually parallel; the meshes in the beta group are parallel to each other.
5. The concentrate spacer screen of claim 4, wherein: the distances between the parallel and adjacent net wires are equal, and the distances are
(ii) a Said distance
And said maximum diameter
Satisfy the relationship of
。
6. The concentrate spacer screen of claim 4, wherein: the included angle between the mesh in the alpha group and the mesh in the beta group is 30-90 degrees.
7. The concentrate spacer screen of claim 4, wherein: the concentrated water separation net is positioned in the roll-type membrane element, is clamped between two opposite membrane sheets on the front sides and is used for guiding the fluid flowing through the roll-type membrane element; the included angle between the mesh in the alpha group or the mesh in the beta group and the water inlet direction of the flow channel of the spiral membrane element is 30-60 degrees.
8. The concentrate spacer screen of claim 3, wherein: the diameter combination and arrangement mode of the mesh in the alpha group and the mesh in the beta group are the same.
9. The concentrate spacer screen of claim 8, wherein: the thickness of the concentrated water separation net is 0.2-2.5 mm.
10. The concentrate spacer screen of any of claims 1-9, wherein: the mesh is made of polypropylene or polyethylene.
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| CN111921379A (en) * | 2020-07-15 | 2020-11-13 | 时代沃顿科技有限公司 | Roll type membrane element pressure-resistant concentrated water separation net |
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2021
- 2021-06-17 CN CN202110668884.8A patent/CN113244773A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098745A (en) * | 2005-10-31 | 2008-01-02 | 日东电工株式会社 | Spiral separation membrane element |
| CN104411385A (en) * | 2012-06-26 | 2015-03-11 | 康韦德塑料制品有限公司 | Membrane filtration using low energy feed spacer |
| CN105233693A (en) * | 2015-11-13 | 2016-01-13 | 珠海格力电器股份有限公司 | Water purifier and reverse osmosis membrane element thereof |
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