CN108525522B - Support element for flat membrane element and flat membrane element - Google Patents
Support element for flat membrane element and flat membrane element Download PDFInfo
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- CN108525522B CN108525522B CN201810634624.7A CN201810634624A CN108525522B CN 108525522 B CN108525522 B CN 108525522B CN 201810634624 A CN201810634624 A CN 201810634624A CN 108525522 B CN108525522 B CN 108525522B
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- 239000012528 membrane Substances 0.000 title claims abstract description 155
- 238000003466 welding Methods 0.000 claims abstract description 179
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000007787 solid Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 26
- 229920001577 copolymer Polymers 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 abstract description 8
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000004907 flux Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001471 micro-filtration Methods 0.000 description 4
- 238000000108 ultra-filtration Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 239000003814 drug Substances 0.000 description 1
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- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
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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
- B01D63/08—Flat membrane modules
- B01D63/087—Single 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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- B01D2313/06—External membrane module supporting or fixing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a support element for a flat membrane element and the flat membrane element in the technical field of solid-liquid separation, and aims to solve the technical problems of thick thickness, large weight, small effective filtering area and easy deformation of the existing flat membrane element, and the flat membrane element comprises a support plate, wherein the cross section of the support plate is in a wave shape, each wave surface of the support plate is provided with drainage holes, and welding areas are arranged around the support plate; the welding area is a solid or hollow body, and when the welding area is a solid, the corresponding end part of the supporting plate is fixedly connected with the welding area; when the welding area is a hollow body, the end part corresponding to the supporting plate is positioned in the hollow body or the end part corresponding to the supporting plate is fixedly connected with the inside of the hollow body. The invention has the advantages of good rigidity, high strength, thin thickness, light weight and tilting prevention, and also has the advantages of large effective filtering area, high circulation, low cost and high filling density.
Description
Technical Field
The invention relates to the technical field of solid-liquid separation, in particular to a support element for a flat membrane element and the flat membrane element.
Background
Mixing-reacting-separating is three general unit operation techniques in general industry, particularly liquid-solid separation, and is recognized as the most commonly used technical means for product purification. Typical representatives of the novel high-efficiency liquid-solid separation technology include microfiltration and ultrafiltration membrane separation, the turbidity of a filtrate is generally less than or equal to 1.0NTU no matter what the material composition is, and the technology is far superior to the industrial technologies such as gravity sedimentation, high-speed centrifugation, plate-frame filter pressing, belt filter pressing, spiral shell stacking machine and the like, and has extremely broad market application prospect.
At present, the micro-filtration and ultra-filtration membranes which are mature in the world comprise two main flow types of flat-plate membranes and hollow membranes, wherein the flat-plate membranes have the advantages of large flux, easy cleaning, long service life, simple operation and maintenance and the like, but have some inherent defects. For example, the effective filtering area of the flat membrane is smaller, the filling density is lower, the gas-water ratio is larger, the unit electricity consumption is higher, and the like, so that the large-scale and industrial popularization of the flat membrane technology and equipment are seriously affected. The root cause of the above-mentioned inherent shortages is that no support element of light weight, good permeability and high mechanical strength is available in the industry.
The state of the art of the inner support element is described below with the intention of a sludge separation as an example: as described in chinese patents CN1676202, CN101541406, CN201534787U, CN201493055U, CN201692771U, CN104107640A, CN102512963A, CN106630130A, CN104307375A, CN104399373A, CN206843180U, CN206622002U, CN206308111U, CN206492403U, CN206751497U, CN206308112U, etc., plastic sheets with good corrosion resistance but low rigidity are basically adopted, longitudinal diversion grooves (common longitudinal staggered patterns) are formed on the front and back surfaces of the plastic sheets, and an inner supporting element attached with a flat membrane is inserted into an equal-width U-shaped groove on the inner side of a frame for limiting and fixing, and a plurality of flat membrane elements are assembled in parallel to form a so-called "flat membrane assembly"; hoisting the flat membrane assembly to the bottom of an aerobic sludge tank or a membrane tank, realizing a liquid-solid separation function under the drive of gravity or a pump, and drawing high-quality effluent. Whereas mass production practice data indicate that:
(1) The inner supporting element is a plastic plate with thicker thickness, wherein the thickness of the imported element is 7.0 mm-8.0 mm, the thickness of the domestic element is 5.5 mm-6.0 mm, the material cost of the inner supporting element accounts for 40% -60% of that of the finished flat membrane element, and the rapid popularization and application of the flat membrane microfiltration and ultrafiltration in the sludge separation field are seriously hindered due to the high manufacturing cost; reducing the thickness of the support element results in insufficient rigidity to stabilize its upright support.
(2) The method is limited by the flow state requirements between adjacent flat membrane elements, when a commercial inner support element is used, the installation interval of the flat membrane elements is usually 6.0 mm-8.0 mm, so that the packing density of the flat membrane assembly is extremely low, the gas-water ratio and the unit electricity consumption are high, the operation cost is high, and the market share expansion of the flat membrane microfiltration and ultrafiltration technology is severely restricted.
(3) Inspired by the structural design of the imported internal supporting element, the front and back sides of the commercially available domestic internal supporting element are provided with bosses (similar to Japanese soup shallow type, longitudinal strip-shaped bosses) or protrusions (similar to Japanese Jiuyan type, diamond protrusions) which are used as working fulcrums in flat membrane filtration or welding contacts in manufacturing. However, the integral areas of the bosses or the protrusions are large, so that the effective area of the flat membrane during filtration is remarkably reduced, and the flux per unit area of the flat membrane is remarkably reduced.
Aiming at the problems, chinese patent CN102512963B discloses a flat-plate membrane inner supporting element, a plurality of bosses which are higher than a supporting plate surface are respectively arranged on the front side and the back side of a supporting plate of the membrane element, adjacent flat-plate membrane element combinations are supported by the supporting plate surface bosses as intervals, the warping deformation is prevented, the thickness of the supporting element is reduced to about 3.5mm from 5.5mm to 6.0mm, the material cost is saved by about 30%, but the technical scheme has the following technical defects:
(1) The flat membrane on the flat membrane element is required to be perforated, and the flat membrane at the boss is effectively sealed, otherwise, water outlet or cleaning liquid medicine is easy to cause short flow due to an opening, and the filtering functionality of the flat membrane is further invalid.
(2) Although the U-shaped slot is not used for inserting the supporting elements, the supporting elements are required to be tightly pressed and sealed by fasteners such as bolts, sealing rubber strips or side sealing plates are required to be used for sealing side face sealing, and watertight problems in engineering practice can not be radically solved.
(3) After a large number of hair fibers are hung or wound on the supporting plate surface bosses between the adjacent flat membrane elements, the effective filtering area of the flat membrane can be greatly reduced, and the difficulty of operation and maintenance is obviously increased due to the fact that the flat membrane has to be manually cleaned during shutdown maintenance.
Chinese patent CN104107640a discloses an improved flat-plate membrane inner support element, i.e. the surface of the inner support element is not provided with a boss, but is provided with vertical strip-shaped bosses all around, and by providing a groove or a flange on the vertical strip-shaped boss, the periphery of the adjacent support plate is sealed and connected, thereby overcoming the problems of positioning and mounting by using a U-shaped slot or compacting and sealing by using a fastener such as a bolt in the prior art, reducing the mounting time and manufacturing cost, and alleviating the problems of hair fiber winding and side sealing to some extent, but still having the following disadvantages:
(1) The vertical strip boss that sets up all around of backup pad has prevented rising between the flat membrane element and has cleaned the air current, must lead to the flat membrane to block up rapidly, can't long-term steady operation.
(2) The vertical strip-shaped boss made of plastic is 3.0 mm-6.0 mm higher than the flat membrane element, so that the mechanical strength is low, and the vertical strip-shaped boss is easy to fracture or deform, so that limit failure is caused.
(3) The flat membrane element has lower filling density and higher cost due to the height limitation of the vertical strip-shaped boss.
(4) The front and back sides of the supporting plate are provided with longitudinal diversion trenches which are arranged in a direction parallel to the strip-shaped bosses. Under the turbulent action of scrubbing air flow, the direction vertical to the flat membrane elements is easy to deform, and the flow state between the elements is deteriorated, so that the blocking process of the flat membrane is accelerated, the flux is rapidly attenuated, the chemical cleaning frequency is rapidly increased, and the overall performance is obviously reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a support element for a flat membrane element and a flat membrane element, so as to solve the technical problems of thicker thickness, heavy weight, small effective filtration area and easy deformation of the existing flat membrane element, and meanwhile, the flat membrane element has the advantages of low cost, long service life, high packing density and small electric consumption.
The technical scheme adopted by the invention is as follows:
the supporting element for the flat membrane element comprises a supporting plate, wherein the cross section of the supporting plate is of a waveform, drainage holes are formed in all wave surfaces of the supporting plate, and welding areas are formed in the periphery of the supporting plate.
The waveform is simple harmonic wave, sawtooth wave, triangular wave or rectangular wave, or the combination of two or more waveforms.
The welding area is a solid or hollow body, and when the welding area is a solid, the corresponding end part of the supporting plate is fixedly connected with the welding area; when the welding area is a hollow body, the end part corresponding to the supporting plate is positioned in the hollow body or the end part corresponding to the supporting plate is fixedly connected with the inside of the hollow body.
Preferably, when the welding area is a hollow body, the height of the inside of the hollow body is adapted to the thickness of the support plate. The thickness of the hollow body is 1mm-5mm.
Further preferred is: the welding areas at the two ends of the supporting plate along the waveform extension direction are first welding areas, and the welding areas at the two ends of the supporting plate along the waveform propagation direction are second welding areas. The first welding area and the second welding area are solid, and are of an integrated structure with the supporting plate; the first welding area and the second welding area are hollow bodies, the first welding area and the second welding area form a square peripheral frame, the height of the inside of the square peripheral frame is equal to the thickness of the supporting plate, and the corresponding end of the supporting plate is positioned in the square peripheral frame; the first welding area is a solid body, the second welding area is a hollow body, the first welding area and the supporting plate are of an integrated structure, and two ends of the supporting plate along the wave propagation direction are respectively positioned in the second welding area; the first welding area is a hollow body, the second welding area is a solid body, two ends of the waveform extending direction of the supporting plate are respectively located in the first welding area, and the second welding area and the supporting plate are of an integrated structure.
The material of the supporting plate and the welding area is ABS or PVC or PE/PP copolymer.
The material of backup pad, welded zone is the stainless steel, and the front and back surface of welded zone all is equipped with the welding rete, and the material of welding rete is ABS or PVC or PE/PP copolymer.
A liquid outlet nozzle and a lifting lug are arranged on the welding area at one end of the supporting plate.
The welding areas at the two ends of the supporting plate along the wave propagation direction are second welding areas, and the liquid outlet nozzle and the lifting lug are arranged on the second welding areas; the lifting lug is provided with an opening with the diameter of 10mm; at least one liquid outlet nozzle is arranged, and the flow area of the liquid outlet nozzle is more than or equal to 10mm 2 The liquid outlet nozzle is communicated with the inner wall of the second welding area and is provided withThe cross section of the outer wall is elliptical or circular, and the cross section of the inner cavity is elliptical, circular or rectangular.
According to the use direction of the flat membrane element, the liquid outlet nozzles can be arranged in the first welding area or the second welding area, and the number of the liquid outlet nozzles can be one or a plurality of liquid outlet nozzles.
The lifting lugs can be arranged in the first welding area or the second welding area according to the using direction of the flat die element, and the number of the lifting lugs can be one or two, and the lifting lugs are symmetrically arranged when the number of the lifting lugs is two.
The liquid outlet nozzle, the lifting lug and the welding area are integrally formed.
The upper surface of the wave crest of the supporting plate and the lower surface of the wave trough of the supporting plate are provided with ridge supporting areas.
Further preferred is: the width of the ridge supporting area is L, and the width L is 0.1-2mm; the wavelength lambda of the supporting plate is 5.0mm-50mm, the wave amplitude A is 0.5mm-2.5mm, and the L/lambda is 0.01< 0.2.
Further preferred is: the single-hole flow area of the drainage hole is more than or equal to 0.785mm 2 The drainage holes are arranged in a linear array on the wave surface of the supporting plate, and the shape of the drainage holes is one or a combination of square, round, elliptic, diamond, triangle, regular pentagon or regular hexagon and any other shape. The center line of the drainage hole can be perpendicular to the wave surface of the supporting plate, can be perpendicular to the surface of the supporting plate, and can be in other various directions.
Further preferred is: the front wave surface and the rear wave surface of the support plate are centrally symmetrical, the wave form of the support plate is simple harmonic wave, sawtooth wave and triangular wave, and the wall thickness of the support plate is 0.1-3mm.
The flat membrane element comprises the supporting element, a front flat membrane and a rear flat membrane, wherein the edges of the front flat membrane and the rear flat membrane are fixedly connected with the front surface and the back surface of a welding area around the supporting plate respectively, so that a plurality of through flow channels are formed between the front flat membrane and the wave surface of the supporting plate, and the through flow channels and the drainage holes form a hole-channel composite liquid collecting area communicated with the liquid outlet nozzle.
When the welding area is made of ABS or PVC or PE/PP copolymer, the front flat film and the rear flat film are directly welded with the welding area into a whole; when the welding area is made of stainless steel, the front flat film and the rear flat film are welded with the welding film layer on the welding area into a whole.
The front flat membrane and the rear flat membrane are made of C-PVC, and the thickness is 0.15mm.
The front flat film and the rear flat film are matched with the peripheral dimension of the welding area in size, the tolerance is 2.0mm, and the deviation between the upper and lower parts is +/-1.0 mm.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the support plate is made of stainless steel or ABS material, has the advantages of good rigidity and high strength, has a waveform cross section, and provides support for the flat membrane through the welding area, so that the flat membrane element has the advantages of thin thickness, light weight and tilting prevention.
2. The drainage holes and the through flow channels on the support plate form a hole-channel composite liquid collecting area, so that the through flow of the flat membrane element can be improved by 50%.
3. The invention provides support for the flat membrane through the ridge supporting area on the wave surface, and compared with the boss or the bulge in the prior art, the contact area between the ridge supporting area and the flat membrane is small, can be almost regarded as line contact, and can increase the effective filtering area by 50%.
4. The flat membrane element has a thin thickness of only 1mm-5mm, and can improve the filling density of the flat membrane assembly by 30%.
5. The flat membrane in the flat membrane element is firmly welded on the supporting element, and cannot be tilted, so that the air-water ratio of the flat membrane component can be reduced by 30%.
6. The invention has low cost and long service life of 20 years.
Drawings
FIG. 1 is one of the cross-sectional wave diagrams of a support plate;
FIG. 2 is a second cross-sectional view of the support plate;
FIG. 3 is a third cross-sectional view of the support plate;
FIG. 4 is one of the front views of the support member;
FIG. 5 is a second front view of the support member;
FIG. 6 is a third elevational view of the support member;
FIG. 7 is one of the cross-sectional views of the support element along the direction of wave propagation;
FIG. 8 is one of the cross-sectional views of the support member along the direction of wave extension;
FIG. 9 is a second cross-sectional view of the support member along the direction of wave propagation;
FIG. 10 is a second cross-sectional view of the support member along the direction of the wave extension;
FIG. 11 is a schematic perspective view of a support member;
FIG. 12 is a schematic view of a flat membrane element structure;
10 is a supporting plate, 11 is a drainage hole, 12 is a ridge supporting area, 20 is a welding area, 21 is a first welding area, 22 is a second welding area, 23 is a liquid outlet nozzle, 24 is a lifting lug, 25 is a welding film layer, 30 is a flat film element, 31 is a front flat film, and 32 is a rear flat film.
Detailed Description
The following examples are given to illustrate the invention in detail, but are not intended to limit the scope of the invention in any way. The components, structures, mechanisms, etc. of the unit modules in the following examples are all conventional commercial products unless otherwise specified.
Example 1: 1-3, a support element for a flat membrane element comprises a support plate 10 with a wall thickness of 0.1-3mm, wherein the cross section of the support plate 10 is a waveform, the waveform is a waveform of any one waveform or a combination of a plurality of waveforms of simple harmonic wave, sawtooth wave, triangular wave or rectangular wave, the wavelength of the waveform is more than or equal to 5.0mm and less than or equal to 50mm, and the amplitude of the waveform is more than or equal to 0.5mm and less than or equal to 2.5mm.
As shown in fig. 4-6, the upper and lower wave surfaces of the supporting plate 10 are respectively provided with a drainage hole 11, the shape of the drainage hole 11 is any one of square, round, oval, diamond, triangle, regular pentagon and regular hexagon or other shapes, and the single-hole flow area (hole cross section) is more than or equal to 0.785mm 2 I.e. the projected area of the drainage aperture 11 in the vertical plane; the drainage holes 11 can be randomly arranged on the supporting plate 10 or can be arranged on the supporting plateAre regularly arranged on the support plate 10 for communicating the upper and lower wave surfaces of the support plate 10.
The periphery of the supporting plate 10 is provided with a welding area 20, the welding area 20 is a solid body or a hollow body, and when the welding area 20 is a solid body, the corresponding end of the supporting plate 10 is fixedly connected with the welding area 20; when the welding area is a hollow body, the height of the inside of the hollow body is matched with the thickness of the supporting plate 10, the thickness of the hollow body is 1mm-5mm, and the corresponding end part of the supporting plate 10 is positioned in the hollow body or the corresponding end part of the supporting plate 10 is fixedly connected with the inside of the hollow body.
As shown in fig. 7 to 10, the welding areas at both ends of the support plate 10 in the wave-shaped extending direction are first welding areas 21, and the welding areas at both ends of the support plate 10 in the wave-shaped propagating direction are second welding areas 22; when the first welding area 21 and the second welding area 22 are solid, the first welding area 21 and the second welding area 22 are integrated with the supporting plate; when the first welding area 21 and the second welding area 22 are hollow, the first welding area 21 and the second welding area 22 form a square peripheral frame, the height of the inside of the square peripheral frame is equal to the thickness of the supporting plate 10, and the corresponding end of the supporting plate 10 is positioned in the square peripheral frame; when the first welding area 21 is a solid body and the second welding area 22 is a hollow body, the first welding area 21 and the supporting plate 10 are in an integrated structure, and two ends of the supporting plate 10 along the wave propagation direction are respectively positioned in the second welding area 22; when the first welding area 21 is a hollow body, the second welding area 22 is a solid body, the second welding area 22 and the support plate 10 are in an integral structure, and two ends of the support plate 10 in the waveform extending direction are respectively located in the first welding area 22.
The material of the supporting plate 10 and the welding area 20 can be single material or stainless steel, and the single material comprises ABS or PVC or PE/PP copolymer; when the material of the support plate 10 and the welding area 20 is stainless steel, the front and rear surfaces of the welding area 20 are provided with welding film layers 25, and the material of the welding film layers 25 is ABS or PVC or PE/PP copolymer.
As shown in fig. 4-6, at least one liquid outlet nozzle 23 and a lifting lug 24 are arranged on the welding area 20 at least one end of the supporting plate 10, for example, the liquid outlet nozzle 23 and the lifting lug 24 are arranged on the second welding area 22, the lifting lugs 24 are two and are bilaterally symmetrical, and the lifting lug 24 is provided with an opening, and the opening is straightThe diameter is 10mm; at least one liquid outlet nozzle 23 is arranged, and the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm 2 The axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, the liquid outlet nozzle 23 is communicated to the inner wall of the second welding zone 22, the cross section of the outer wall of the liquid outlet nozzle 23 is elliptical or circular, and the cross section of the inner cavity is elliptical, circular or rectangular.
The upper surface of the crest of the support plate 10 and the lower surface of the trough of the support plate 10 are provided with ridge support areas 12, the ridge support areas 12 have a width L of 0.1-2mm and a width L of 0.01< L/lambda <0.2.
As shown in fig. 12, a flat membrane element 30 comprising the above supporting element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are respectively and fixedly connected with the front and the rear of the welding area 20 around the supporting plate 10, so that a plurality of through flow channels are formed between the front flat membrane 31, the rear flat membrane 32 and the wave surface of the supporting plate 10, and the through flow channels and the drainage holes 11 form a hole-channel composite liquid collecting area communicated with the liquid outlet mouth 23.
When the welding area 25 is made of ABS or PVC or PE/PP copolymer, the front flat film 31 and the rear flat film 32 are directly welded with the welding area 20 into a whole by hot melting; when the material of the welding area 20 is stainless steel, the front flat film 31 and the rear flat film 32 are directly welded with the welding film layer 25 on the welding area 20 into a whole by hot melting.
The front flat film 31 and the rear flat film 32 are made of C-PVC, the thickness is 0.15mm, the sizes of the front flat film 31 and the rear flat film 32 are matched with the peripheral size of the welding area 20, the tolerance is 2.0mm, and the deviation between the upper and lower parts is +/-1.0 mm.
In example 2, an ABS single material is taken as an example to describe in detail: as shown in fig. 1, a support member for a flat membrane element includes a support plate 10, the cross section of the support plate 10 is a simple harmonic waveform, and the wavelength λ=5.0 mm and the amplitude a=1.5 mm of the waveform; as shown in FIG. 4, the support plate 10 having a wall thickness of 0.2mm is provided with a circular drainage hole 11 having a radius of 1.5mm, and the drainage hole 11 has an overflow area of 1.767mm 2 I.e. the projected area of the drainage aperture 11 in the vertical plane; the drainage holes 11 are arranged on the support plate 10 in a linear array and are used for communicating the upper surface and the lower surface of the support plate 10, and a ridge support area is arranged at the upper surface of the crest of the support plate 10 and the lower surface of the trough of the support plate 1012, the ridge support area 12 has a width L of 0.1mm.
As shown in fig. 7 and 8, welding areas 20 are arranged around the support plate 10, the welding areas at two ends of the support plate 10 along the waveform extending direction are first welding areas 21, the welding areas at two ends of the support plate 10 along the waveform transmitting direction are second welding areas 22, the first welding areas 21 and the second welding areas 22 are solid bodies, and the support plate 10 and the welding areas 20 are made of ABS materials and are of an integral structure manufactured by adopting a double-port injection molding process;
as shown in fig. 4 and 11, two liquid outlet nozzles 23 and a lifting lug 24 are integrally formed on the outer wall of the second welding zone 22, the two liquid outlet nozzles 23 are arranged on two sides of the lifting lug 24 in a bilateral symmetry state, the lifting lug 24 is provided with an opening, and the diameter of the opening is 10mm; the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm 2 The axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, the inner cavity of the liquid outlet nozzle 23 is communicated to the inner wall of the second welding zone 22, and the cross section of the outer wall of the liquid outlet nozzle 23 is elliptical, and the cross section of the inner cavity is elliptical.
As shown in fig. 12, a flat membrane element 30 comprising the above supporting element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are directly welded with the front surface and the back surface of the welding area 20 around the supporting plate 10 into a whole by hot melt welding, so that a plurality of through flow channels are formed between the front flat membrane 31 and the rear flat membrane 32 and the upper wave surface and the lower wave surface of the supporting plate 10, and the through flow channels and the drainage holes 11 form a hole-channel composite liquid collecting area communicated with the liquid outlet.
In this embodiment, the front flat film 31 and the rear flat film 32 are made of C-PVC and have a thickness of 0.15mm, and the front flat film 31 and the rear flat film 32 have a tolerance of ±1.0mm and a tolerance of 2.0mm, which are matched with the outer peripheral dimension of the bonding pad 20.
With reference to factory standard inspection conditions (i.e. pressure 5kPa, water temperature 20) o C) The clear water flux is more than or equal to 930mL/min, and is qualified, and the average value of the clear water flux measured three times is 1953mL/min aiming at the flat membrane element 30 manufactured by the support element disclosed by the invention, so that the flat membrane element reaches 2.1 times of the qualified standard of delivery.
Example 3, a detailed description will be given of a composite of ABS and stainless steel: as shown in FIG. 2, a support member for a flat membrane element comprises a supportA stay plate 10, the cross section of the stay plate 10 is a triangular wave shape, and the wave has a wavelength lambda=10.0 mm and an amplitude a=1.25 mm; as shown in FIG. 6, a square drainage hole 11 was provided in the support plate 10 having a wall thickness of 0.5mm, and the drainage hole 11 had an overflow area of 0.785mm 2 I.e. the projected area of the drainage aperture 11 in the vertical plane; the drainage holes 11 are arranged on the support plate 10 in a linear array and are used for communicating the upper surface and the lower surface of the support plate 10, and ridge support areas 12 are arranged on the upper surface of the wave crest of the support plate 10 and the lower surface of the wave trough of the support plate 10, and the width of each ridge support area 12 is L, and the width L is 0.4mm.
As shown in fig. 5, 9 and 10, the periphery of the support plate 10 is provided with a welding area 20, the welding areas at two ends of the support plate 10 along the extending direction of the waveform are a first welding area 21, the welding areas at two ends of the support plate 10 along the propagating direction of the waveform are a second welding area 22, the first welding area 21 and the second welding area 22 are hollow bodies, the first welding area 21 and the second welding area 22 form a square peripheral frame, the height inside the square peripheral frame is equal to the thickness of the support plate 10, and four ends of the support plate 10 are positioned inside the square peripheral frame; the material of backup pad 10, welded zone 20 is stainless steel, and the front and back surface of welded zone 20 all is equipped with welds membranous layer 25, and the material of welding membranous layer 25 is the ABS material.
As shown in fig. 6, two lifting lugs 24 and a liquid outlet nozzle 23 are integrally formed on the outer wall of the second welding zone 22, the two lifting lugs are arranged on two sides of the liquid outlet nozzle 23 in a bilateral symmetry state, holes are formed in the lifting lugs 24, and the diameters of the holes are 10mm; the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm 2 The axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, the inner cavity of the liquid outlet nozzle 23 is communicated to the inner wall of the second welding zone 22, and the cross section of the outer wall of the liquid outlet nozzle 23 is elliptical, and the cross section of the inner cavity is circular.
As shown in fig. 12, the flat membrane element 30 comprising the support element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are respectively welded with the welding membrane layer 25 on the welding area 20 around the support plate 10 into a whole in a hot-melt manner, so that a plurality of through flow channels are formed between the front flat membrane 31 and the rear flat membrane 32 and the upper wave surface and the lower wave surface of the support plate 10, and the through flow channels and the drainage holes 11 form a hole-channel composite liquid collecting area communicated with the liquid outlet nozzle 23.
In this embodiment, the front flat film 31 and the rear flat film 32 are made of C-PVC and have a thickness of 0.15mm, and the front flat film 31 and the rear flat film 32 have a tolerance of ±1.0mm and a tolerance of 2.0mm, which are matched with the outer peripheral dimension of the bonding pad 20.
With reference to factory standard inspection conditions (i.e. pressure 5kPa, water temperature 20) o C) And the clear water flux is more than or equal to 930mL/min and is qualified. Aiming at the flat membrane element 30 manufactured by the support element, the clear water flux is measured for three times, the average value is 3250mL/min, and the average value reaches 3.5 times of the qualified standard of delivery.
Example 4, a PVC single material is taken as an example to describe in detail: as shown in fig. 3, a support member for a flat membrane element includes a support plate 10, the cross section of the support plate 10 is in a sawtooth waveform, and the wavelength λ=50.0 mm and the amplitude a=5 mm of the waveform; as shown in FIG. 4, the support plate 10 having a wall thickness of 3mm was provided with an elliptical drainage hole 11, and the drainage hole 11 had an overflow area of 5.67mm 2 I.e. the projected area of the drainage aperture 11 in the vertical plane; the drainage holes 11 are arranged in a linear array on the supporting plate and are used for communicating the upper surface and the lower surface of the supporting plate 10, and ridge supporting areas 12 are arranged on the upper surface of the wave crest of the supporting plate 10 and the lower surface of the wave trough of the supporting plate 10, and the width of each ridge supporting area 12 is L, and the width L is 2mm.
As shown in fig. 8 and 9, the periphery of the support plate 10 is provided with a welding area 20, the welding areas at two ends of the support plate 10 along the wave-shaped extending direction are a first welding area 21, the welding areas at two ends of the support plate 10 along the wave-shaped propagating direction are a second welding area 22, the first welding area 21 is a solid body, the second welding area 22 is a hollow body, the first welding area 21 and the support plate 10 are in an integral structure, two ends of the support plate 10 along the wave-shaped propagating direction are respectively positioned in the second welding area 22,
the supporting plate 10 and the welding area 20 are made of PVC material and are manufactured by adopting a double-port injection molding process;
as shown in fig. 5, a liquid outlet nozzle 23 and a lifting lug 24 are integrally formed on the outer wall of the second welding zone 22, and an opening is formed in the lifting lug 24, wherein the diameter of the opening is 10mm; the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm 2 The axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, and the inner cavity of the liquid outlet nozzle 23 is connected withThe cross section of the outer wall of the liquid outlet nozzle 23 is elliptic, and the cross section of the inner cavity is square.
As shown in fig. 12, the flat membrane element 30 comprising the support element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are directly welded with the welding area 20 around the support plate 20 into a whole by hot melting, so that a plurality of through flow passages are formed between the front flat membrane 31, the rear flat membrane 32 and the upper wave surface and the lower wave surface of the support plate 10, and the through flow passages and the drainage holes 11 form a hole-channel composite liquid collecting area communicated with the liquid outlet nozzle 23.
In this embodiment, the front flat film 31 and the rear flat film 32 are made of C-PVC and have a thickness of 0.15mm, and the front flat film 31 and the rear flat film 32 have a tolerance of ±1.0mm and a tolerance of 2.0mm, which are matched with the outer peripheral dimension of the bonding pad 20.
Example 5 details of a PE/PP copolymer compounded with stainless steel are given below: as shown in fig. 1, a support member for a flat membrane element includes a support plate 10, the cross section of the support plate 10 is a simple harmonic waveform, and the wavelength λ=25.0 mm and the amplitude a=2 mm of the waveform; the supporting plate 10 with the wall thickness of 1.5mm is provided with a diamond drainage hole 11, and the overflow area of the drainage hole 11 is 1.56mm 2 I.e. the projected area of the drainage aperture 11 in the vertical plane; the drainage holes 11 are arranged on the support plate 10 in a linear array and are used for communicating the upper surface and the lower surface of the support plate 10, and ridge support areas 12 are arranged on the upper surface of the wave crest of the support plate 10 and the lower surface of the wave trough of the support plate 10, and the width of each ridge support area 12 is L, and the width L is 1.2mm.
As shown in fig. 7 and 10, the welding areas 20 are arranged around the support plate 10, the welding areas at two ends of the support plate 10 along the waveform extending direction are first welding areas 21, the welding areas at two ends of the support plate 10 along the waveform transmitting direction are second welding areas 22, the first welding areas 21 are hollow bodies, the second welding areas 22 are solid bodies, two ends of the support plate 10 along the waveform extending direction are respectively positioned in the first welding areas 21, and the second welding areas 22 and the support plate are of an integral structure.
The material of the supporting plate 10 and the welding area 20 is stainless steel, the front surface and the rear surface of the welding area 20 are respectively provided with a welding film layer 25, and the material of the welding film layer 25 is PE/PP copolymer.
As shown in fig. 4, two liquid outlet nozzles 23 and a lifting lug 24 are integrally formed on the outer wall of the second welding zone 22, the two liquid outlet nozzles 23 are arranged on two sides of the lifting lug 24 in a bilateral symmetry state, and the lifting lug 24 is provided with an opening with the diameter of 10mm; the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm 2 The axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, the inner cavity of the liquid outlet nozzle 23 is communicated to the inner wall of the second welding zone 22, and the cross section of the outer wall of the liquid outlet nozzle 23 is elliptical, and the cross section of the inner cavity is circular.
As shown in fig. 12, the flat membrane element 30 comprising the support element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are respectively welded with the welding membrane layer 25 on the welding area 20 around the support plate 10 into a whole, so that a plurality of through flow channels are formed between the front flat membrane 31 and the rear flat membrane 32 and the upper wave surface and the lower wave surface of the support plate 20, and the through flow channels and the drainage holes 11 form a hole-channel composite liquid collecting area communicated with the liquid outlet.
In this embodiment, the front flat film 31 and the rear flat film 32 are made of C-PVC and have a thickness of 0.15mm, and the front flat film 31 and the rear flat film 32 have a tolerance of ±1.0mm and a tolerance of 2.0mm, which are matched with the outer peripheral dimension of the bonding pad 20.
Example 6, a single PE/PP copolymer material is described in detail: as shown in fig. 1, a support member for a flat membrane element includes a support plate 10, the cross section of the support plate 10 is a simple harmonic waveform, and the wavelength λ=15.0 mm and the amplitude a=1 mm of the waveform; the supporting plate 10 with the wall thickness of 0.1mm is provided with a hexagonal drainage hole 11, and the overflow area of the drainage hole 11 is 1.32mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The drainage holes 11 are arranged on the support plate 10 in a linear array and are used for communicating the upper surface and the lower surface of the support plate 10, and ridge support areas 12 are arranged on the upper surface of the wave crest of the support plate 10 and the lower surface of the wave trough of the support plate 10, and the width of each ridge support area 12 is L, and the width L is 0.5mm.
As shown in fig. 7 and 8, welding areas 20 are arranged around the support plate 10, the welding areas at two ends of the support plate 10 along the extending direction of the waveform are first welding areas 21, the welding areas at two ends of the support plate 10 along the propagating direction of the waveform are second welding areas 22, the first welding areas 21 and the second welding areas 22 are solid bodies, and the support plate 10 and the welding areas 20 are made of PE/PP copolymer and are of an integral structure manufactured by adopting a double-port injection molding process;
as shown in fig. 4, two liquid outlet nozzles 23 and a lifting lug 24 are integrally formed on the outer wall of the second welding zone 22, the two liquid outlet nozzles 23 are arranged on two sides of the lifting lug 24 in a bilateral symmetry state, and the lifting lug 24 is provided with an opening with the diameter of 10mm; the overflow area of the liquid outlet nozzle 23 is more than or equal to 10mm < 2 >, the axial direction of the liquid outlet nozzle 23 is consistent with the wave propagation direction, the inner cavity of the liquid outlet nozzle 23 is communicated to the inner wall of the second welding zone 22, the cross section of the outer wall of the liquid outlet nozzle 23 is elliptical, and the cross section of the inner cavity is square.
As shown in fig. 12, the flat membrane element 30 comprising the support element further comprises a front flat membrane 31 and a rear flat membrane 32, wherein the edges of the front flat membrane 31 and the rear flat membrane 32 are respectively welded with the front surface and the back surface of the welding area 20 around the support plate 10 directly into a whole, so that a plurality of through flow passages are formed between the front flat membrane 31 and the rear flat membrane 32 and the upper wave surface and the lower wave surface of the support plate 10, and the through flow passages and the drainage holes 10 form a hole-channel composite liquid collecting area communicated with the liquid outlet nozzle 23.
In this embodiment, the front flat film 31 and the rear flat film 32 are made of C-PVC and have a thickness of 0.15mm, and the front flat film 31 and the rear flat film 32 have a tolerance of ±1.0mm and a tolerance of 2.0mm, which are matched with the outer peripheral dimension of the bonding pad 20.
When the flat membrane elements are used, a plurality of flat membrane elements are combined to form a new membrane assembly according to the prior membrane assembly mode, filtrate is filtered by the front flat membrane 31 and the rear flat membrane 32 and then is collected into a hole-channel composite liquid collecting area formed by a through flow channel and a drainage hole between the front flat membrane 31 and the rear flat membrane 32, and then is discharged from liquid outlets 23, the liquid outlets 23 of the flat membrane elements are collected together, and finally, the filtration of the filtrate is realized through the membrane assembly. When the front flat membrane 31 and the rear flat membrane 32 need to be cleaned, flushing liquid is fed through the liquid outlet nozzle 23 to back flush the front flat membrane 31 and the rear flat membrane 32.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. Support element for flat membrane element, including backup pad, its characterized in that: the cross section of the supporting plate is wave-shaped, and convex ridge supporting areas are arranged on the upper surface of the wave crest of the supporting plate and the lower surface of the wave trough of the supporting plate; drainage holes are formed in each wave surface of the supporting plate, and welding areas are formed in the periphery of the supporting plate; the welding areas at the two ends of the supporting plate along the wave propagation direction are second welding areas, and the liquid outlet nozzle and the lifting lug are arranged on the second welding areas;
the wave length of the wave form is that lambda is more than or equal to 5.0mm and less than or equal to 50mm, and the amplitude is more than or equal to 0.5mm and less than or equal to 2.5mm;
the single-hole flow area of the drainage hole is more than or equal to 0.785mm 2 ；
The ridge support area has a width L of 0.1-2mm, and 0.01< L/lambda <0.2.
2. The support member for flat membrane elements as claimed in claim 1, wherein: the welding area is a solid or hollow body, and when the welding area is a solid, the corresponding end part of the supporting plate is fixedly connected with the welding area; when the welding area is a hollow body, the end part corresponding to the supporting plate is positioned in the hollow body or the end part corresponding to the supporting plate is fixedly connected with the inside of the hollow body.
3. The support member for flat membrane elements as claimed in claim 1, wherein: the material of the supporting plate and the welding area is ABS or PVC or PE/PP copolymer.
4. Support element for flat membrane elements according to claim 1 or 2, characterized in that: the material of backup pad, welded zone is the stainless steel, and the front and back surface of welded zone all is equipped with the welding rete, and the material of welding rete is ABS or PVC or PE/PP copolymer.
5. The support member for flat membrane elements as claimed in claim 1, wherein: the lifting lug is provided with an opening; the liquid outlet is at least provided with one, the liquid outlet is communicated with the inner wall of the second welding area, the cross section of the outer wall of the liquid outlet is elliptical or circular, and the cross section of the inner cavity is elliptical, circular or rectangular.
6. The support member for flat membrane elements as claimed in claim 1, wherein: the drainage holes are arranged in a linear array on the wave surface of the supporting plate.
7. A flat membrane element comprising the support element according to any one of claims 1-6, further comprising a front flat membrane and a rear flat membrane, wherein the front flat membrane and the rear flat membrane are made of C-PVC, and edges of the front flat membrane and the rear flat membrane are fixedly connected to front and rear surfaces of four-terminal welding areas of the support plate respectively, so that a plurality of through flow passages are formed between the front flat membrane, the rear flat membrane and wave surfaces of the support plate, and the through flow passages and the drainage holes form a hole-channel composite liquid collecting area communicated with the liquid outlet nozzle.
8. The flat membrane element of claim 7, wherein: when the welding area is made of ABS or PVC or PE/PP copolymer, the front flat film and the rear flat film are directly welded with the welding area into a whole; when the welding area is made of stainless steel, the front flat film and the rear flat film are welded with the welding film layer on the welding area into a whole.
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| CN201810634624.7A CN108525522B (en) | 2018-06-20 | 2018-06-20 | Support element for flat membrane element and flat membrane element |
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