WO2020191557A1 - 导流网、膜元件和过滤组件 - Google Patents

导流网、膜元件和过滤组件 Download PDF

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Publication number
WO2020191557A1
WO2020191557A1 PCT/CN2019/079361 CN2019079361W WO2020191557A1 WO 2020191557 A1 WO2020191557 A1 WO 2020191557A1 CN 2019079361 W CN2019079361 W CN 2019079361W WO 2020191557 A1 WO2020191557 A1 WO 2020191557A1
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WO
WIPO (PCT)
Prior art keywords
water
net
membrane
water inlet
water outlet
Prior art date
Application number
PCT/CN2019/079361
Other languages
English (en)
French (fr)
Inventor
陈振丰
Original Assignee
溢泰（南京）环保科技有限公司
溢泰实业股份有限公司
林庆雄
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 溢泰（南京）环保科技有限公司, 溢泰实业股份有限公司, 林庆雄 filed Critical 溢泰（南京）环保科技有限公司
Priority to CN201980059526.8A priority Critical patent/CN112689531B/zh
Priority to US17/279,863 priority patent/US11938430B2/en
Priority to PCT/CN2019/079361 priority patent/WO2020191557A1/zh
Priority to CA3114253A priority patent/CA3114253C/en
Publication of WO2020191557A1 publication Critical patent/WO2020191557A1/zh

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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
    • B01D63/08—Flat membrane modules
    • B01D63/082—Flat membrane modules comprising a stack of flat membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1692—Other shaped material, e.g. perforated or porous sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/10—Accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/58—Multistep processes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0681—The layers being joined by gluing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/26—Further operations combined with membrane separation processes
    • B01D2311/2649—Filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/14—Specific spacers
    • B01D2313/143—Specific spacers on the feed side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/10—Cross-flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/027—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
    • C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/02—Fluid flow conditions
    • C02F2301/026—Spiral, helicoidal, radial
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • This application relates to the technical field of water treatment, and in particular to a flow guide net, and membrane elements and filter components using the flow guide net.
  • RO reverse osmosis membrane
  • NF nanofiltration membrane
  • FIG 1 shows the principle diagram of cross-flow filtration, where the arrow in Figure 1 represents the direction of liquid flow.
  • the raw liquid on the left in Figure 1 flows parallel to the membrane surface 100 to the right in Figure 1, and flows downward through the membrane during the flow.
  • Surface 100 is filtered. Therefore, when the stock solution flows parallel to the membrane surface 100, a shear force will be generated to take away the particles 200 retained on the membrane surface, so that the contaminant layer deposited on the membrane surface 100 can be kept at a relatively thin level. .
  • FIG. 2A a structural schematic diagram of a traditional RO membrane and/or NF membrane filtration module.
  • the traditional RO membrane and/or NF membrane filtration module is cylindrical, and is composed of a central tube 300 and a membrane element 400 rolled around the central tube 300.
  • the membrane element 400 is usually provided with at least one layer of diversion net.
  • Fig. 2B is an expanded view of a traditional RO membrane and/or NF membrane filtration module, in which only the guide net 410 is shown.
  • the membrane element 400 further includes a filter membrane and a water outlet diversion layer laminated with the diversion net 410. These film layers are arranged under the guide net 410 in FIG. 2B, so they cannot be reflected in FIG. 2B.
  • raw water flows in from the inlet side of the guide net 410, and concentrated water flows from the guide net 410 The outlet side flows out.
  • water flows in the axial direction of the central pipe 300.
  • the purpose of the present application is to provide a flow guide net and a membrane element and filter assembly using the flow guide net.
  • the flow direction of the raw water in the membrane element is changed by the structural design of the guide net, so that the flow direction of the raw water is changed from axial flow to radial flow, thereby lengthening the length of the filter flow channel. Therefore, the filter assembly of the guide screen described in the present application, especially the cross-flow filter assembly, can flush the surface contaminants of the separation membrane and reduce the precipitation and fouling of the contaminants, so as to slow down the problem of fouling speed on the water outlet side of the membrane element. , Improve the fouling problem, thereby greatly increasing the service life of membrane elements and even filter components.
  • a diversion net having a water inlet side and a water outlet side opposite to each other, wherein a first water barrier material is provided on the water inlet side of the diversion net to The water inlet side of the sealing part and an effective water inlet width are defined on the water inlet side; a second water barrier material is arranged on the water outlet side of the diversion net to seal part of the water outlet side and An effective water outlet width is defined on the water outlet side; and the diversion net has a comb-like structure including at least one comb tooth within the effective water outlet width range on the water outlet side.
  • the first water barrier material provided on the water inlet side forms at least one opening to form a plurality of inlets on the part of the water inlet side sealed by the first water barrier material. Water channel.
  • the comb teeth are arranged equidistantly or not equidistantly.
  • the openings are arranged equidistantly or not equidistantly.
  • the effective water inlet width is 110% to 140% of the vertical distance between the water inlet side and the water outlet side.
  • the effective water outlet width is 60% to 90% of the vertical distance between the water inlet side and the water outlet side.
  • the projection of the effective water inlet width of the water inlet side on the water outlet side does not fall within the range of the effective water outlet width.
  • the width of the comb teeth is W1
  • the length of the comb teeth is L1 wherein the range of W1 is 18-22 mm, and the range of L1 is 80-100 mm.
  • the distance between the comb teeth ranges from 8 to 12 mm.
  • the width of the openings is 3-8 mm, and the spacing between the openings is 60-80 mm.
  • the water barrier material is polyurethane glue.
  • a membrane element which includes a layer of laminated water production diversion net, at least one separation membrane, and any one of the above-mentioned diversion nets.
  • the diversion net is in contact with the water inlet surface of the separation membrane; the water production diversion net is in contact with the water outlet surface of the separation membrane.
  • the separation membrane is folded in half, and the water production diversion net is sandwiched in the separation membrane folded in half.
  • the separation membrane is a reverse osmosis membrane or a nanofiltration membrane.
  • the water production diversion net, the at least one separation membrane and the diversion net are bonded to each other by an adhesive.
  • the adhesive is a conventional agent applied to membrane elements in the field.
  • the sides of the water production diversion net, the at least one separation membrane and the guide net are aligned, and the water production diversion net The separation membrane and the guide net are bonded to each other.
  • the water inlet side of the diversion net is not bonded to the separation membrane and the water production diversion net at the effective water inlet width; the water outlet side of the diversion net is at the The effective water outlet width does not adhere to the separation membrane and the water production diversion net.
  • the separation membrane is folded in half, and the water production diversion net is sandwiched in the separation membrane folded in half, so that the structure of the membrane element is the separation membrane and the production Water diversion net, separation membrane and the diversion net, and the side edges of the successively stacked separation membrane, the water production diversion net, the separation membrane and the diversion net are aligned, and pass on the side
  • the adhesive is applied to bond the separation membrane, the water-producing diversion net, the separation membrane and the diversion net which are stacked in sequence; wherein the water inlet side of the diversion net is at the effective water inlet width The location is not bonded to the separation membrane and the water-producing diversion net; the water outlet side of the diversion net is not bonded to the separation membrane and the water-producing diversion net at the effective water outlet width.
  • a filter assembly which includes at least one layer of any one of the above-mentioned guide nets or at least one layer of any one of the above-mentioned membrane elements.
  • the filter assembly is a cross-flow filter assembly.
  • a filter assembly which includes a central water collection pipe and a membrane element surrounding the central water collection pipe, and the membrane element includes a layer of laminated water inlet diversion net and at least one separation membrane And a layer of water production diversion network; among them,
  • the water inlet diversion net has an opposite water inlet side and a water outlet side, and a first water barrier material is arranged on the water inlet side of the diversion net to seal part of the water inlet side and An effective water inlet width is defined on the water inlet side; a second water barrier material is arranged on the water outlet side of the diversion net to seal part of the water outlet side and define an effective water inlet side on the water outlet side.
  • Water outlet width; the guide net has a comb-like structure including at least one comb tooth within the effective water outlet width range on the water outlet side; and, the effective water inlet width on the water inlet side is at the The projection on the water outlet side does not fall within the range of the effective water outlet width.
  • the effective water inlet width is 110% to 140% of the vertical distance between the water inlet side and the water outlet side; and, the effective water outlet width is the water inlet side and the water outlet side.
  • the vertical distance between the water outlet sides is 60% to 90%.
  • the water inlet width and the water outlet width of the filter assembly are changed by the arrangement of the first water barrier material and the second water barrier material.
  • the flow direction of the raw water is changed from the traditional axial direction along the central pipe to the radial direction along the central pipe, effectively increasing the length of the raw water filtration process .
  • the inlet water flow rate is constant, the flow rate of the raw water flowing through the membrane element is effectively increased, and the difference in fluid flow velocity between the inlet and outlet ends of the membrane element is effectively reduced, thereby improving the concentration polarization phenomenon.
  • the comb-shaped structure within the effective water outlet width on the water outlet side of the diversion net further increases the filtration flow channel space of the raw water, thereby further reducing the precipitation and scaling of pollutants on the surface of the membrane element.
  • the dead zone of the membrane element can be eliminated and the end flow rate can be increased, and at the same time, the effect of washing and diluting pollutants is produced. So as to further slow down the precipitation and fouling of pollutants on the surface of the membrane element.
  • the flow direction of the raw water in the membrane element is changed through the structural design of the guide net, so that the flow direction of the raw water is changed from axial flow to radial flow, thereby lengthening the length of the filtering flow channel. Therefore, the filter assembly of the guide screen described in the present application, especially the cross-flow filter assembly, can flush the surface contaminants of the separation membrane and reduce the precipitation and fouling of the contaminants, so as to slow down the problem of fouling speed on the water outlet side of the membrane element. , Improve the fouling problem, thereby greatly increasing the service life of membrane elements and even filter components.
  • Figure 1 is a schematic diagram of cross-flow filtration
  • Figure 2A is a schematic view of the structure of a traditional RO membrane and/or NF membrane filtration module
  • FIG. 2B is a schematic structural view of the unfolded state of the membrane elements of the traditional RO membrane and/or NF membrane filtration module shown in FIG. 2A;
  • Fig. 3 is a schematic structural diagram of a diversion net according to an embodiment of the present application.
  • Figure 4 is a partial enlarged view of Figure 3;
  • 5A to 5C are structural schematic diagrams of the comb teeth in different embodiments.
  • FIGS. 6A to 6C are structural schematic diagrams of membrane elements according to different embodiments of the present application.
  • Fig. 7 is a schematic structural diagram of a filter assembly according to an embodiment of the present application, wherein the membrane element of the filter assembly is in an unfolded state;
  • 8A to 8C are experimental verification data of the filter assembly according to an embodiment of the present application.
  • This embodiment provides a diversion net. The detailed description will be given below in conjunction with FIG. 3 and FIG. 4.
  • Fig. 3 is a schematic structural diagram of a diversion net 1 according to an embodiment of the present application. As shown in FIG. 3, the diversion net 1 has an inlet side 11 and an outlet side 12 opposite to each other.
  • a first water barrier material 111 is provided on the water inlet side 11 of the guide net 1 to seal a part of the water inlet side 11 and define an effective material on the water inlet side.
  • Water inlet width EW1 is provided on the water outlet side 12 of the diversion net 1 to seal part of the water outlet side 12 and define an effective water outlet width EW2 on the water outlet side 12.
  • the guide net 1 has a comb-shaped structure including at least one comb tooth 122 within the effective water outlet width EW2 of the water outlet side 12. At least one opening 112 is formed on the first water-insulating material 111 arranged on the water inlet side 11 to form a plurality of openings 112 on the part of the water-inlet side 11 sealed by the first water-insulating material 111 Water inlet channel.
  • the projection of the effective water inlet width EW1 of the water inlet side 11 on the water outlet side 12 does not fall within the range of the effective water outlet width EW2.
  • the positional relationship between the effective water inlet width EW1 and the effective water outlet width EW2 may not be limited to the example shown in FIG. 3, and may also have other positional relationships, and only needs to satisfy the The projection of the effective water inlet width EW1 on the water outlet side 12 does not need to fall within the effective water outlet width EW2.
  • the effective water inlet width EW1 is 110%-140% of the vertical distance D between the water inlet side 11 and the water outlet side 12.
  • the effective water outlet width EW2 is 60% to 90% of the vertical distance D between the water inlet side 11 and the water outlet side 12.
  • the water barrier material is polyurethane glue, which is a commercially available commodity.
  • the definition: the width of the comb teeth 122 is W1, the length of the comb teeth is L1, and the distance between the comb teeth 122 and adjacent comb teeth is S1.
  • the width W1 of the comb teeth 122 is in the range of 18-22 mm
  • the length L1 of the comb teeth 122 is in the range of 80-100 mm
  • the distance S1 between the comb teeth 122 is in the range of 8-12 mm.
  • the definition: the width of the opening 112 is W2, and the distance between the opening 112 and the adjacent opening is S2.
  • the width W2 of the opening 112 ranges from 3 to 8 mm
  • the distance S2 between the openings 112 ranges from 60 to 80 mm.
  • the comb teeth 122 may be arranged equidistantly as shown in FIGS. 3 and 4, or may be arranged unequal distance; the opening 112 may be as shown in FIGS. 3 and 4.
  • the equidistant setting shown can also be an unequal distance setting.
  • the rack 121 may also have other shapes, and is not limited to the structure shown in FIG. 3 or FIG. 4.
  • the rack 121 may have a structure as shown in FIGS. 5A to 5C.
  • the membrane element 2 includes a layer of laminated water production diversion net 21, at least one separation membrane 22 and a layer of the diversion net 1.
  • the diversion net 1 is in contact with the water inlet surface 221 of the separation membrane 22, and the water production diversion net 21 is in contact with the water outlet surface 222 of the separation membrane 22.
  • the separation membrane 22 may be a reverse osmosis membrane or a nanofiltration membrane.
  • the specific structure of the adhesive is not shown in FIG. 6A.
  • the water-producing diversion net 21, the separation membrane 22, and the diversion net 1 pass through an adhesive. Glue to each other.
  • This kind of adhesive is a product known in the art.
  • the water production diversion net 21, the separation membrane 22, and the diversion net 1 are aligned around the sides, and the water production diversion net 21, the separation membrane 22 And at least three sides of the diversion net 1 are coated with adhesive, so that the water production diversion net 21, the separation membrane 22 and the diversion net 1 are as shown in, for example, but not limited to, as shown in FIG.
  • the membrane element 2 in FIG. 6A may also have a structure as shown in FIG. 6B.
  • the difference from the structure of FIG. 6A is that the separation membrane 22 is folded. Therefore, in this embodiment, as shown in FIG. 6B, the water production diversion net 21 is sandwiched on the folded surface of the separation membrane 22. That is to say, in the membrane element 2 shown in FIG. 6B, since the separation membrane 22 is folded, so that both sides of the water production diversion net 21 are in line with the output of the separation membrane 22.
  • the water surface 222 touches.
  • the membrane element 2 in FIG. 6A can also be arranged in layers to serve as a part of a filter assembly.
  • FIG. 6C for the laminated structure of the membrane element 2.
  • the membrane element 2' has the same structure as the membrane element 2, and the membrane element 2'and the membrane element 2 are laminated.
  • the separation membrane 22 of the membrane element 2 of the first layer is folded, and the water production guide net 21 is sandwiched between the separation membranes 22, the The water inlet surface 221 of the separation membrane 22 of the membrane element 2 is in contact with the guide net 1'of the membrane element 2'of the second layer.
  • the water inlet surface of the separation membrane of the upper membrane element is in contact with the guide net of the next membrane element, so that the water inlet surface of each layer of separation membrane can pass through.
  • the corresponding diversion net is filled with water.
  • the present application also provides a filter assembly 3, as shown in FIG. 7, the filter assembly 3 includes a central water collection pipe 31 and at least one layer surrounding the central water collection pipe 31 as shown in FIG. 6A or FIG. 6B The membrane element 2.
  • the filter assembly 3 includes a multilayer membrane element, the laminated structure of the membrane element is as shown in FIG. 6C.
  • the membrane element 2 is a laminated structure, only the guide net 1 can be shown in FIG. 7.
  • the detailed structure of the central water collection pipe 31 is not shown in FIG. 7.
  • the central water collection pipe 31 is a conventional component in the field and has any structure known in the art.
  • the arrow direction represents the direction of water flow.
  • the water flow is provided on the water inlet side 11
  • the first water-proof material 111 enables raw water to enter only from the effective water inlet width EW1.
  • the second water barrier material 121 corresponding to the effective water inlet width EW1 on the water outlet side 12, the water flow can only be along the width direction of the diversion net 1 (that is, with the The direction perpendicular to the vertical distance D between the inlet side 11 and the outlet side 12) flows. Then it flows out through the effective water outlet width EW2 of the water outlet side 12.
  • EW2 effective water outlet width
  • the flow direction of the raw water of the diversion net 1 described in this application is changed from the traditional axial direction along the central pipe to along
  • the radial direction of the center tube effectively increases the length of the raw water filtration process.
  • the comb-shaped structure within the effective water outlet width EW2 on the outlet side 12 of the diversion net 1 further increases the filtration flow channel space of the raw water (makes the raw water more contact with the area below the diversion net 1 Separation membrane), thereby further slowing down the precipitation and fouling of pollutants on the surface of the membrane element.
  • the dead zone of the membrane element can be eliminated and the The end flow rate, and at the same time produce the effect of flushing and diluting the pollutants, thereby further reducing the precipitation and fouling of pollutants on the surface of the membrane element.
  • the applicant further verified the filtration effects of the traditional RO membrane filtration module shown in FIG. 2A and the filtration module 3 described in this application.
  • the traditional RO membrane filter module shown in Fig. 2A and the filter module 3 described in this application were installed in the reverse osmosis water purifier, according to GB 34914-2017 "Reverse Osmosis Water Purifier Water Efficiency Limit and Water Efficiency
  • the test methods specified in "Class” respectively detect the flow-life, flow loss and salt rejection rate of the traditional RO membrane filter module shown in Figure 2A and the filter module 3 described in this application, and obtain the results shown in Figures 8A to 8C. Test Results.
  • the filter assembly 3 of the present application can significantly reduce the flow loss during the filtration process (about 30% reduction), and significantly increase the salt rejection rate.
  • the flow direction of the raw water in the membrane element is changed through the structural design of the guide net, so that the flow direction of the raw water is changed from axial flow to radial flow, thereby lengthening the length of the filter flow channel. Therefore, the filter assembly of the guide screen described in the present application, especially the cross-flow filter assembly, can flush the surface contaminants of the separation membrane and reduce the precipitation and fouling of the contaminants, so as to slow down the problem of fouling speed on the water outlet side of the membrane element. , Improve the fouling problem, thereby greatly increasing the service life of membrane elements and even filter components.
  • the main body of this application can be manufactured and used in industry and has industrial applicability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

一种导流网（1），具有相对的一进水侧（11）和一出水侧（12），其中，在导流网（1）的进水侧（11）上设置一第一隔水材料（111），以密封部分进水侧（11），并在进水侧（11）上定义一有效进水宽度（EW1）；在导流网（1）的出水侧（12）上设置一第二隔水材料（121），以密封部分出水侧（12），并在出水侧（12）上定义一有效出水宽度（EW2）；并且，导流网（1）在出水侧（12）的有效出水宽度（EW2）范围内具有一包含至少一梳齿（122）的梳状结构。还公开了一种膜元件和一种过滤组件。

Description

导流网、膜元件和过滤组件 技术领域
本申请涉及水处理技术领域，尤其涉及一种导流网以及应用该导流网的膜元件和过滤组件。
背景技术
随着人们健康饮水意识的提高，人们对饮用水质要求不断提升，各种净水设备进入市场，走入千家万户。现在有越来越多的家庭开始使用应用反渗透膜(RO)或纳滤膜(NF)的家用纯水机。
RO膜纯水机与NF膜纯水机均采用错流过滤技术(cross flow filtration)。请参见图1，图1所示的是错流过滤的原理图，其中图1中箭头代表液体的流动方向。如图1所示，在错流过滤技术中，在泵的推动下，图1中左侧的原液平行于膜面100向图1中右侧流动，并在流动过程中向下流经所述膜面100进行过滤。因此，在原液平行于膜面100流动时，会产生剪切力而将膜面上滞留的颗粒200带走，从而使沉积于所述膜面100表面上的污染层保持在一个较薄的水平。
因此，在图1所示的错流过滤技术中会产生大量需排放的浓水(即图1中右侧)。随着环保意识抬头及友善环境的需求，减少浓水排放量是RO膜纯水机与NF膜纯水机进行推广普及使用需突破的瓶颈。
请参见图2A为传统的RO膜和/或NF膜过滤组件的结构示意图。如图2A所示，传统的RO膜和/或NF膜过滤组件呈圆柱状，由中心管300及绕着所述中心管300卷制的膜元件400组合而成。为了使得原水流动并完成过滤，所述膜元件400通常设置至少一层导流网。请参见图2B，图2B为传统RO膜和/或NF膜过滤组件的展开图，其中仅显示了导流网410。本领域技术人员根据本领域公知常识可知，所述膜元件400还包括与所述导流网410层叠的过滤膜及出水导流层。这些膜层在图2B中为设置于所述导流网410的下方，因而在如图2B中无法体现。
在传统的RO膜和/或NF膜过滤组件的膜元件中，如图2B中箭头所示，原水从所述导流网410的进水侧流入，而浓缩水则从所述导流网410的出水侧流出。在过滤过程中，水流以所述中心管300的轴向方向流动。
技术问题
在传统的RO膜和/或NF膜过滤组件中，存在进水流道宽、过滤流程短的结构特性， 使得整体过滤流速慢。同时，该种过滤组件中，膜片表面容易产生浓差极化现象造成结垢堵塞，从而使得膜元件脱盐率及纯水产量降低，进而严重影响膜元件的使用寿命。
技术解决方案
本申请的目的在于提供一种导流网以及应用该导流网的膜元件和过滤组件。通过所述导流网的结构设计以改变膜元件内原水的水流方向，使得原水流动方向由轴向流动变成径向流动，从而加长过滤流道的长度。因此，利用本申请所述导流网的过滤组件，尤其是错流过滤组件，可以实现冲刷分离膜表面污染物并降低污染物沉淀结垢，以减缓膜元件中末端出水侧的结垢速度问题，改善结垢问题，从而大幅提高膜元件乃至过滤组件的使用寿命。
根据本申请的一方面，提供一种导流网，具有相对的一进水侧和一出水侧，其中，在所述导流网的所述进水侧上设置一第一隔水材料，以密封部分所述进水侧并在所述进水侧上定义一有效进水宽度；在所述导流网的所述出水侧上设置一第二隔水材料，以密封部分所述出水侧并在所述出水侧上定义一有效出水宽度；并且，所述导流网在所述出水侧的所述有效出水宽度范围内具有一包含至少一梳齿的梳状结构。
在一实施例中，设置于所述进水侧上的所述第一隔水材料形成至少一开口，以在被所述第一隔水材料密封的部分所述进水侧上形成多个进水通道。
在一实施例中，所述梳齿等距设置或不等距设置。
在一实施例中，所述开口等距设置或不等距设置。
在一实施例中，所述有效进水宽度为所述进水侧与所述出水侧之间垂直距离的110％～140％。
在一实施例中，所述有效出水宽度为所述进水侧与所述出水侧之间垂直距离的60％～90％。
在一实施例中，所述进水侧的所述有效进水宽度在所述出水侧的投影不落入所述有效出水宽度的范围内。
在一实施例中，所述梳齿的宽度为W1，所述梳齿的长度为L1，其中，W1的范围为18～22mm，L1的范围为80～100mm。
在一实施例中，所述梳齿之间的间距范围为8～12mm。
在一实施例中，所述开口的宽度为3～8mm，开口之间的间距为60～80mm。
在一实施例中，所述隔水材料为聚氨酯胶水。
根据本申请的另一方面，提供一种膜元件，包括层叠的一层产水导流网、至少一层分 离膜和一层上述任意一种导流网。
在实施例中，所述导流网与所述分离膜的进水面接触；所述产水导流网与所述分离膜的出水面接触。
在一实施例中，所述分离膜对折设置，所述产水导流网夹设在对折设置的所述分离膜内。
在一实施例中，所述分离膜为反渗透膜或纳滤膜。
在一实施例中，所述产水导流网、所述至少一层分离膜及所述导流网之间通过胶粘剂相互粘合。所述胶粘剂为本领域中应用于膜元件的常规试剂。
在一优选实施例中，所述产水导流网、所述至少一层分离膜及所述导流网侧边对齐，并通过在侧边涂布胶粘剂将所述产水导流网、所述分离膜及所述导流网相互粘合。
在一实施例中，所述导流网的进水侧在所述有效进水宽度处与所述分离膜及所述产水导流网不粘合；所述导流网的出水侧在所述有效出水宽度处与所述分离膜及所述产水导流网不粘合。
在一优选实施例中，所述分离膜对折设置，所述产水导流网夹设在对折设置的所述分离膜内，使得所述膜元件的结构为依次层叠的分离膜、所述产水导流网、分离膜及所述导流网，并且，所述依次层叠的分离膜、所述产水导流网、分离膜及所述导流网的侧边对齐，并通过在侧边涂布胶粘剂将所述依次层叠的分离膜、所述产水导流网、分离膜及所述导流网相互粘合；其中，所述导流网的进水侧在所述有效进水宽度处与所述分离膜及所述产水导流网不粘合；所述导流网的出水侧在所述有效出水宽度处与所述分离膜及所述产水导流网不粘合。
根据本申请的另一方面还提供一种过滤组件，包括至少一层上述任意一种导流网或至少一层上述任意一种膜元件。
在一实施例中，所述过滤组件为错流过滤组件。
在一较佳实施例中，提供一种过滤组件，包括一中心集水管和围绕所述中心集水管的膜元件，所述膜元件包括层叠的一层进水导流网、至少一层分离膜和一层产水导流网；其中，
所述进水导流网具有相对的一进水侧和一出水侧，在所述导流网的所述进水侧上设置一第一隔水材料，以密封部分所述进水侧并在所述进水侧上定义一有效进水宽度；在所述导流网的所述出水侧上设置一第二隔水材料，以密封部分所述出水侧并在所述出水侧上定 义一有效出水宽度；所述导流网在所述出水侧的所述有效出水宽度范围内具有一包含至少一梳齿的梳状结构；并且，所述进水侧的所述有效进水宽度在所述出水侧的投影不落入所述有效出水宽度的范围内。
在上述较佳实施例中，所述有效进水宽度为所述进水侧与所述出水侧之间垂直距离的110％～140％；并且，所述有效出水宽度为所述进水侧与所述出水侧之间垂直距离的60％～90％。
有益效果
在本申请中，首先通过所述第一隔水材料及第二隔水材料的设置，改变了过滤组件的进水宽度和出水宽度。同时，通过将有效进水宽度与有效出水宽度错位设置将原水的流动方向由传统的沿着中心管的轴向方向改为了沿着中心管的径向方向，有效地增加了原水的过滤流程长度。这样，在进水流量恒定时，有效地增加了流经膜元件的原水流速，有效降低了膜元件的进水端与出水端之间的流体流速差异，从而改善浓差极化现象。
其次，由于原水的过滤流程长度的增加，且流体流速的增加，能够更有效地冲刷膜元件表面污染物，从而降低污染物在膜元件表面上的沉淀和结垢，进而延长了膜元件的使用寿命。
再者，通过在导流网的出水侧的所述有效出水宽度范围内的梳状结构，进一步增加了原水的过滤流道空间，从而进一步减缓污染物在膜元件表面上的沉淀和结垢。此外，通过在进水侧的所述第一隔水材料形成多个开口，以增加原水的有效进水量，可以消除膜元件的死区并增加末端流速，并同时产生冲洗稀释污染物的作用，从而进一步减缓污染物在膜元件表面上的沉淀和结垢。
由此，在本申请中，通过所述导流网的结构设计以改变膜元件内原水的水流方向，使得原水流动方向由轴向流动变成径向流动，从而加长过滤流道的长度。因此，利用本申请所述导流网的过滤组件，尤其是错流过滤组件，可以实现冲刷分离膜表面污染物并降低污染物沉淀结垢，以减缓膜元件中末端出水侧的结垢速度问题，改善结垢问题，从而大幅提高膜元件乃至过滤组件的使用寿命。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为错流过滤的原理图；
图2A为传统的RO膜和/或NF膜过滤组件的结构示意图；
图2B为图2A所示传统RO膜和/或NF膜过滤组件的膜元件展开状态的结构示意图；
图3为根据本申请一实施例的一导流网的结构示意图；
图4为图3的局部放大图；
图5A至图5C为不同实施例中所述梳齿的结构示意图；
图6A至图6C为根据本申请不同实施例的膜元件的结构示意图；
图7为根据本申请一实施例的过滤组件的结构示意图，其中，过滤组件的膜元件呈展开状态；
图8A至图8C为根据本申请一实施例的过滤组件的实验验证数据。
本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书以及上述附图中的术语“第一”、“第二”、“第三”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应当理解，这样描述的对象在适当情况下可以互换。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含。
在本专利文档中，下文论述的附图以及用来描述本申请公开的原理的各实施例仅用于说明，而不应解释为限制本申请公开的范围。所属领域的技术人员将理解，本申请的原理可在任何适当布置的系统中实施。将详细说明示例性实施方式，在附图中示出了这些实施方式的实例。此外，将参考附图详细描述根据示例性实施例的终端。附图中的相同附图标号指代相同的元件。
本申请说明书中使用的术语仅用来描述特定实施方式，而并不意图显示本申请的概念。除非上下文中有明确不同的意义，否则，以单数形式使用的表达涵盖复数形式的表达。在本申请说明书中，应理解，诸如“包括”、“具有”以及“含有”等术语意图说明存在本申请说明书中揭示的特征、数字、步骤、动作或其组合的可能性，而并不意图排除可存在或可添加一个或多个其他特征、数字、步骤、动作或其组合的可能性。附图中的相同参考标号指代 相同部分。
本实施例提供一导流网。以下结合图3和图4进行详细说明。
参见图3，图3是根据本申请一实施例的一导流网1的结构示意图。如图3所示，所述导流网1具有相对的一进水侧11和一出水侧12。
如图3所示，在所述导流网1的所述进水侧11上设置一第一隔水材料111，以密封部分所述进水侧11并在所述进水侧上定义一有效进水宽度EW1。而在所述导流网1的所述出水侧12上设置一第二隔水材料121，以密封部分所述出水侧12并在所述出水侧12上定义一有效出水宽度EW2。
请继续参见图3，所述导流网1在所述出水侧12的所述有效出水宽度EW2范围内具有一包含至少一梳齿122的梳状结构。在设置于所述进水侧11上的所述第一隔水材料111上形成至少一开口112，以在被所述第一隔水材料111密封的部分所述进水侧11上形成多个进水通道。
如图3所示，所述进水侧11的所述有效进水宽度EW1在所述出水侧12的投影不落入所述有效出水宽度EW2的范围内。本领域技术人员可以理解的是，所述有效进水宽度EW1与所述有效出水宽度EW2之间的位置关系可以不限于图3所示的示例，也可以具有其他位置关系，只需要满足所述有效进水宽度EW1在所述出水侧12的投影不落入所述有效出水宽度EW2的范围内即可。
请继续参见图3，所述有效进水宽度EW1为所述进水侧11与所述出水侧12之间垂直距离D的110％～140％。所述有效出水宽度EW2为所述进水侧11与所述出水侧12之间垂直距离D的60％～90％。
在本实施例中，所述隔水材料为聚氨酯胶水，是一种市售商品。
以下，结合图4，详细描述所述包含至少一梳齿122的梳状结构以及所述第一隔水材料111上的开口112。
如图4所示，定义：所述梳齿122的宽度为W1，所述梳齿的长度为L1，所述梳齿122与相邻梳齿之间的间距为S1。所述梳齿122的宽度W1的范围为18～22mm，所述梳齿122的长度L1的范围为80～100mm，所述梳齿122之间的间距S1的范围为8～12mm。如图3所示，定义：所述开口112的宽度为W2，所述开口112与相邻开口之间的间距为S2。所述开口112的宽度W2的范围为3～8mm，所述开口112之间的间距S2的范围为60～80mm。
本领域技术人员可以知晓的是，所述梳齿122可以是如图3和图4所示的等距设置， 也可以是不等距设置；所述开口112可以是如图3和图4所示的等距设置，也可以是不等距设置。此外，本领域技术人员可以知晓的是，所述齿条121也可以具有其他形状，而不限于图3或图4所示的结构。例如，所述齿条121也可以具有如图5A～图5C所示的结构。
进一步地，本申请还提供一种膜元件2。如图6A所示，所述膜元件2包括层叠的一层产水导流网21、至少一层分离膜22和一层所述导流网1。所述导流网1与所述分离膜22的进水面221接触，所述产水导流网21则与所述分离膜22的出水面222接触。
在本申请中，所述分离膜22可以是反渗透膜或纳滤膜。
为清晰的目的而没有在图6A中显示胶粘剂的具体结构，本领域技术人员可以理解的是，所述产水导流网21、所述分离膜22及所述导流网1之间通过胶粘剂相互粘合。该种胶粘剂为本领域已知的产品。例如，如图6A所示的，所述产水导流网21、所述分离膜22及所述导流网1四周侧边对齐，在所述产水导流网21、所述分离膜22及所述导流网1的至少三条侧边上涂布胶粘剂，使得所述产水导流网21、所述分离膜22及所述导流网1在例如但不限于图6A中所示的上边缘、右边缘和下边缘处粘合，并且，所述导流网1的进水侧在所述有效进水宽度EW1处与所述分离膜22及所述产水导流网21不粘合；所述导流网1的出水侧在所述有效出水宽度EW2处与所述分离膜22及所述产水导流网21不粘合。也就是说，在一实施例中，除了所述有效进水宽度EW1及所述有效出水宽度EW2外，所述导流网1与所述分离膜22及所述产水导流网21的其余各边均粘合。
进一步地，在本申请的另一实施例中，图6A中的所述膜元件2还可以具有如图6B所示的结构。与图6A的的结构差异在于：所述分离膜22为折叠设置。因此，在该实施例中，如图6B所示的，所述产水导流网21被夹设于所述分离膜22的折叠面。也就是说，在图6B所示的所述膜元件2中，由于所述分离膜22是折叠设置的，使得所述产水导流网21的两侧表面均与所述分离膜22的出水面222接触。
进一步地，在本申请的另一实施例中，图6A的所述膜元件2还可以层叠设置，以作为一过滤组件的一部分。所述膜元件2的层叠结构请参见图6C。如图6C所示的，所述膜元件2’具有与所述膜元件2完全相同的结构，所述膜元件2’与所述膜元件2层叠设置。这样，由于第一层的所述膜元件2的所述分离膜22是折叠设置的，且所述产水导流网21夹设于所述分离膜22之间，使得第一层的所述膜元件2的所述分离膜22的进水面221与第二层的所述膜元件2’的所述导流网1’接触。当然，在三层或多层层叠的情况依次类推，即，上一层膜元件的分离膜的进水面与下一层膜元件的导流网接触，使得每一层分离膜的 进水面可以通过对应的导流网进行进水。
进一步地，本申请还提供一种过滤组件3，如图7所示，所述过滤组件3包括一中心集水管31和围绕所述中心集水管31的至少一层如图6A或图6B所示的膜元件2。当然，当所述过滤组件3包括多层膜元件时，所述膜元件的层叠结构如图6C所示。在图7的展开图中，由于所述膜元件2为层叠结构，因而图7中仅能显示所述导流网1。并且为了清晰的目的，图7中未显示所述中心集水管31的细节结构。本领域技术人员可以知晓的是，所述中心集水管31为本领域的常规部件，具有任何本领域已知的结构。在图7所示的过滤组件3中，箭头方向代表了水流方向。
如图7所示，当水流通过所述导流网1的所述进水侧11流入所述导流网1并进入所述过滤组件3时，由于在所述进水侧11上设置有所述第一隔水材料111，使得原水只能从所述有效进水宽度EW1进入。并且，由于所述出水侧12上与所述有效进水宽度EW1对应的为所述第二隔水材料121，因而使得水流只能沿着所述导流网1的宽度方向(即与所述进水侧11与所述出水侧12之间的垂直距离D相垂直的方向)流动。随后通过所述出水侧12的有效出水宽度EW2流出。与图2B中传统RO膜和/或NF膜过滤组件内的水流方向不同的，本申请所述的导流网1的原水的流动方向由传统的沿着中心管的轴向方向改为了沿着中心管的径向方向，有效地增加了原水的过滤流程长度。同时，通过在所述导流网1的出水侧12的所述有效出水宽度EW2范围内的梳状结构，进一步增加了原水的过滤流道空间(使原水更多地接触导流网1下方的分离膜)，从而进一步减缓污染物在膜元件表面上的沉淀和结垢。此外，通过在所述导流网1的所述进水侧11的所述第一隔水材料111上形成多个开口112，以增加原水的有效进水量，可以消除膜元件的死区并增加末端流速，并同时产生冲洗稀释污染物的作用，从而进一步减缓污染物在膜元件表面上的沉淀和结垢。
申请人进一步对图2A所示的传统RO膜过滤组件与本申请所述过滤组件3的过滤效果进行实验验证。实验验证中分别将图2A所示的传统RO膜过滤组件与本申请所述过滤组件3安装在反渗透净水机中，以GB 34914-2017《反渗透净水机水效限定值及水效等级》中规定的测试方法，分别对图2A所示的传统RO膜过滤组件与本申请所述过滤组件3的流量-寿命，流量损失及脱盐率进行检测，获得图8A至图8C所示的测试结果。
由图8A至图8C所示，本申请所述过滤组件3能够明显降低过滤过程中的流量损失(约降低30％)，且明显提高脱盐率。
在本申请中，通过所述导流网的结构设计以改变膜元件内原水的水流方向，使得原水 流动方向由轴向流动变成径向流动，从而加长过滤流道的长度。因此，利用本申请所述导流网的过滤组件，尤其是错流过滤组件，可以实现冲刷分离膜表面污染物并降低污染物沉淀结垢，以减缓膜元件中末端出水侧的结垢速度问题，改善结垢问题，从而大幅提高膜元件乃至过滤组件的使用寿命。
以上所述仅是本申请的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。
工业实用性
本申请的主体可以在工业中制造和使用，具备工业实用性。

Claims (17)

  1. 一种导流网，具有相对的一进水侧和一出水侧，其中，
    在所述导流网的所述进水侧上设置一第一隔水材料，以密封部分所述进水侧并在所述进水侧上定义一有效进水宽度；
    在所述导流网的所述出水侧上设置一第二隔水材料，以密封部分所述出水侧并在所述出水侧上定义一有效出水宽度；并且，
    所述导流网在所述出水侧的所述有效出水宽度范围内具有一包含至少一梳齿的梳状结构；
    其中，所述有效出水宽度为所述进水侧与所述出水侧之间垂直距离的60％～90％，所述有效进水宽度为所述进水侧与所述出水侧之间垂直距离的110％～140％，并且，所述进水侧的所述有效进水宽度在所述出水侧的投影不落入所述有效出水宽度的范围内。
  2. 如权利要求1所述的导流网，其中，设置于所述进水侧上的所述第一隔水材料形成至少一开口，以在被所述第一隔水材料密封的部分所述进水侧上形成多个进水通道。
  3. 如权利要求1所述的导流网，其中，所述梳齿等距设置或不等距设置。
  4. 如权利要求2所述的导流网，其中，所述开口等距设置或不等距设置。
  5. 如权利要求1所述的导流网，其中，所述梳齿的宽度为W1，所述梳齿的长度为L1，其中，W1的范围为18～22mm，L1的范围为80～100mm。
  6. 如权利要求5所述的导流网，其中，所述梳齿之间的间距范围为8～12mm。
  7. 如权利要求2所述的导流网，其中，所述开口的宽度为3～8mm，开口之间的间距为60～80mm。
  8. 如权利要求1～4中任意一项所述的导流网，其中，所述隔水材料为聚氨酯胶水。
  9. 一种膜元件，包括层叠的一层产水导流网、至少一层分离膜和一层权利要求1所述的导流网。
  10. 如权利要求9所述的膜元件，其中，所述导流网与所述分离膜的进水面接触；所述产水导流网与所述分离膜的出水面接触。
  11. 如权利要求10所述的膜元件，其中，所述分离膜对折设置，所述产水导流网夹设在对折设置的所述分离膜内。
  12. 如权利要求11所述的膜元件，其中，所述分离膜为反渗透膜或纳滤膜。
  13. 如权利要求11所述的膜元件，其中，所述产水导流网、所述分离膜及所述导流网侧边对齐，并通过在侧边涂布胶粘剂将所述产水导流网、所述分离膜及所述导流网相互粘合； 其中，所述导流网的进水侧在所述有效进水宽度处与所述分离膜及所述产水导流网不粘合；所述导流网的出水侧在所述有效出水宽度处与所述分离膜及所述产水导流网不粘合。
  14. 如权利要求13所述的膜元件，其中，所述胶粘剂为聚氨酯胶水。
  15. 一种过滤组件，包括一中心集水管，以及至少一层权利要求1所述的导流网或至少一层权利要求10所述的膜元件。
  16. 如权利要求15所述的过滤组件，其中，所述过滤组件包括多层所述膜元件时，所述多层膜元件依次层叠后围绕所述中心集水管。
  17. 如权利要求15所述的过滤组件，其中，所述过滤组件为错流过滤组件。
PCT/CN2019/079361 2019-03-22 2019-03-22 导流网、膜元件和过滤组件 WO2020191557A1 (zh)

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