CN106731858B

CN106731858B - Plate type membrane assembly

Info

Publication number: CN106731858B
Application number: CN201710022371.3A
Authority: CN
Inventors: 高麟; 汪涛; 李翔; 陈慧
Original assignee: Intermet Technology Chengdu Co Ltd
Current assignee: Intermet Technology Chengdu Co Ltd
Priority date: 2017-01-12
Filing date: 2017-01-12
Publication date: 2023-03-31
Anticipated expiration: 2037-01-12
Also published as: CN106731858A

Abstract

The invention discloses a plate-type membrane component, comprises two oppositely arranged diaphragms and an inner support body positioned between the two diaphragms, the inner support body comprises a first frame body and a first net body bridged on the opposite inner sides of each side edge of the first frame body, and the two diaphragms are hermetically connected with the first frame body and are respectively positioned on two sides of the first net body; the diaphragm is fixedly connected with the first frame body, and the diaphragm is positioned between the first net body and the second net body; and a liquid outlet communicated with the cavity between the two diaphragms is formed in at least one side edge of the first frame body, and the stock solution sequentially passes through the second net body and the diaphragms to form clear solution which is collected in the cavity and is discharged from the liquid outlet.

Description

Plate type membrane assembly

Technical Field

The invention relates to the technical field of filtration, in particular to a plate-type membrane component.

Background

Plate-type membrane modules, hollow fiber membrane modules, tubular membrane modules are commonly used filter elements. In China, hollow fiber membrane modules and plate-type membrane modules are commonly used. The hollow fiber membrane component is easy to have a broken filament phenomenon under higher filtering pressure, so that the later operation process is complex, the cost is higher, and the frequency of backwashing and drug washing is far higher than that of a plate-type membrane component, so that the service life of the hollow fiber membrane component is generally short, generally 2-3 years, and the service life of the plate-type membrane component can be kept at 5-7 years. In addition, the sludge concentration range which can be processed by the hollow fiber membrane component is 4000-8000mg/L, and the sludge concentration range which can be processed by the plate-type membrane component can reach 8000-10000mg/L. For the replacement in the later period, the membrane broken filament amount of the hollow fiber membrane component reaches 20 percent and then the hollow fiber membrane component needs to be completely replaced, and the plate-type membrane component only needs to be replaced by the membrane.

The membrane materials mainly used by the existing plate-type membrane component are plastics, filter paper, ceramic membranes and the like. There are the following disadvantages: 1) The plate-type membrane assembly composed of membranes made of plastics, filter paper and the like has low filtering pressure and can not be backwashed; meanwhile, due to the limitation of materials, the plate-type membrane component cannot be applied to high-temperature and acid-base strong corrosion environments; 2) The ceramic plate type membrane component has good chemical stability, acid and alkali resistance and high mechanical strength, but the characteristic of the ceramic material provides a hotbed for scaling, the backwashing effect is low, and the scaling phenomenon is serious and becomes a main factor influencing the service life of the system; 3) The ceramic material has the characteristics of poor thermal shock resistance, non-machining, non-welding connection and the like due to the serious room temperature brittleness of the ceramic plate type membrane assembly.

The existing plate-type membrane assembly generally comprises two membranes and a cavity, wherein the opposite sides of the cavity are of porous structures, the membranes are bonded with the porous structures, and the purified liquid filtered by the membranes flows out of pores of the porous structures and is discharged from a liquid outlet arranged on the cavity. Because the adhesive force is weaker, the phenomenon that the membrane and the porous structure are mutually stripped frequently occurs, so that the plate-type membrane component loses the filtering function, the product quality is seriously reduced, and the production cost is improved.

Disclosure of Invention

Based on the defects of the prior art, the technical problem to be solved by the invention is to provide a plate-type membrane component which can bear higher pressure, has good mechanical property and long service life.

The technical scheme adopted by the invention for solving the technical problems is that the plate-type membrane component comprises two oppositely-arranged membranes and an inner support body positioned between the two membranes, wherein the inner support body comprises a first frame body and a first net body which is bridged on the opposite inner sides of all side edges of the first frame body, and the two membranes are connected with the first frame body in a sealing manner and are respectively positioned at two sides of the first net body; the diaphragm support structure comprises an inner support body and two outer support bodies, wherein the two outer support bodies are respectively positioned on two sides of the inner support body, each outer support body comprises a second frame body and a second net body which is bridged on the opposite inner sides of each side edge of the second frame body, and the second frame body is fixedly connected with the first frame body to enable the diaphragm to be positioned between the first net body and the second net body; and a liquid outlet communicated with the cavity between the two diaphragms is formed in at least one side edge of the first frame body, and the stock solution sequentially passes through the second net body and the diaphragms to form clear solution which is collected in the cavity and is discharged from the liquid outlet.

Through setting up inner support body and outer support body, can support the diaphragm from the both sides of diaphragm, show the stability in use who promotes the diaphragm, promote the filtration pressure that the diaphragm can bear and the blowback pressure that can bear when blowback, prolong plate membrane module's life.

As a further improvement of the plate-type membrane module, at least one side surface of the first net body is provided with a supporting column perpendicular to the membrane; at least on the second net body opposite to the membrane the side surface of the diaphragm is provided with a supporting column vertical to the diaphragm. The area of contact of support column and diaphragm is less than the area of contact of dictyosome and diaphragm far away, consequently the membrane module of equidimension, the plate-type membrane module of this application has higher effective filter area, has further promoted filtration efficiency. In addition, the support column forms a plurality of stoste flow channel on the diaphragm surface, and this passageway can promote the torrent effect of stoste, makes stoste fully erode the diaphragm to show promotion filter speed.

As a further improvement of the plate-type membrane module, the supporting columns are positioned at the intersection of the network lines; when the support column is located the net twine intersection, the area of contact of support column and dictyosome is big, and cohesion is strong, easy production, and the distribution of support column is more even moreover, helps promoting the force stability of diaphragm. The net wires are mutually interwoven to form a first net body and a second net body.

As a further improvement of the plate-type membrane assembly, the height of the supporting column is 2-5mm. When the height of the supporting column is lower than the parameter range, the net body and the membrane are close to each other, so that the original liquid can still be hindered to a certain extent, and the effect of improving the effective filtering area is not obvious; when the height of the supporting column is higher than the range, the distance between the membrane and the net body is large, when the supporting column is under large filtering pressure and backwashing pressure, the contact point of the membrane and the supporting column can generate large local impact force, and the membrane is easy to deform seriously due to the limitation that the net body cannot be obtained. Further, the contact area of the supporting column and the membrane is preferably 9-100mm ² (ii) a Further, the shape of the contact surface of the support column and the diaphragm is preferably circular.

As a further improvement of the plate-type membrane module, the first frame body and the second frame body are connected through mutually matched bulges and grooves. The protrusion and the groove are matched with each other, and the detachable connection mode belongs to the detachable connection mode, so that the membrane assembly is simpler to detach and install, the replacement of the membrane is facilitated, and the disassembly and assembly efficiency is obviously improved. Of course, other removable connections, such as a bolt assembly, may be used.

As a further improvement of the plate-type membrane module, a liquid outlet is formed in one group of opposite side edges of the first frame body; this shortens the outflow path of the clean liquid and makes the pressure in the cavity between the two diaphragms more stable. Furthermore, the number of the liquid outlets on the side edge provided with the liquid outlets is at least three and the liquid outlets are distributed at equal intervals.

As a further improvement of the plate-type membrane assembly, the membrane is a sheet made of solid solution alloy, a metal simple substance with a face-centered cubic structure or a metal porous material with a body-centered cubic structure as a matrix phase. The diaphragm is made of metal, has better bending performance compared with ceramic materials, can be connected with the first frame body through welding, and has stronger binding force and difficult shedding. The method for manufacturing the membrane is described in detail in the application file of the Chinese patent 2014106089803 or the application file of the Chinese patent 2015101531163, and is not described in detail here.

As a further improvement of the plate-type membrane assembly, the membrane has a thickness of 5-1500 μm, an average pore diameter of 0.05-100 μm and a porosity of 15-70%.

As a further improvement of the plate-type membrane assembly, the plate-type membrane assembly further comprises a frame welded with the peripheral edge of the membrane into a whole, and the membrane is connected with the first frame body through the frame; through setting up the frame, can increase the area of being connected of diaphragm and first framework, make the diaphragm and be connected more firm with first framework. Furthermore, the thickness of the frame is 0.5-2mm, namely the width of the surface of the frame welded with the first frame body.

As a further improvement of the plate-type membrane module, the thickness of the first frame body is 8-12mm; the thickness of the second frame body is 3-8mm; a positioning groove is formed in one side edge of the first frame body. The locating slot is of a structure matched with the matched equipment structure, and the plate-type membrane assembly can be rapidly installed and taken out.

As a further improvement of the plate-type membrane module, the plate-type membrane module has a rectangular outer shape.

The plate-type membrane component has the following outstanding advantages:

1) Through setting up inner support body and outer support body, can support the diaphragm from the both sides of diaphragm, show the stability in use who promotes the diaphragm, promote the filter pressure that the diaphragm can bear and the blowback pressure that can bear when the blowback, prolong the filter effect of board-like membrane.

2) Through setting up the support column can formula plate-type membrane module have higher effective filtration area, further promoted filtration efficiency.

3) The first frame body and the second frame body are connected with each other through the protrusions and the grooves, so that the membrane assembly is simpler to disassemble and assemble, the replacement of the membrane is facilitated, and the disassembling and assembling efficiency is remarkably improved.

4) The diaphragm is made of metal, has better bending performance compared with ceramic materials, can be connected with the first frame body through welding, and has stronger binding force and difficult shedding.

5) Through setting up the frame, can increase the area of being connected of diaphragm and first framework, make the diaphragm and be connected more firm with first framework.

Drawings

FIG. 1 is a schematic structural diagram of a plate-type membrane module according to the present invention.

Fig. 2 is an exploded view of the plate-type membrane module of fig. 1.

Fig. 3 is an enlarged view of a portion a of the plate-type membrane module of fig. 1.

FIG. 4 is a cross-sectional view of the plate membrane module of FIG. 1.

Detailed Description

Example 1

The plate-type membrane module with the rectangular shape as shown in fig. 1 and fig. 2 comprises two membranes 1 which are placed oppositely, an inner support body 2 which is positioned between the two membranes 1, and two outer support bodies 3, wherein the inner support body 2 comprises a first frame body 21 and a first net body 22 which is bridged on the opposite inner sides of each side edge of the first frame body 21, and the two membranes 1 are connected with the first frame body 21 in a sealing manner and are respectively positioned on two sides of the first net body 21; the outer support body 3 comprises a second frame body 31 and a second net body 32 bridging the opposite inner sides of each side edge of the second frame body 31, the second frame body 31 is fixedly connected with the first frame body 21, and the membrane 1 is positioned between the first net body 22 and the second net body 32; two long sides of the first frame body 21 are respectively provided with 7 liquid outlets 211 distributed at equal intervals, and clear liquid formed after the stock solution sequentially passes through the second net body 32 and the membrane 1 is collected in the cavity and discharged from the liquid outlets 211. A cylindrical support column 5 which is perpendicular to the membrane 1 and has the height of 5mm and the diameter of 5mm is arranged on one side surface of the first net body 22, and the support column 5 is positioned at the cross position of the net line.

As shown in fig. 3, a groove 212 is formed on the first frame body 21, a protrusion 310 matched with the groove 212 is formed on the second frame body 31, and the first frame body 21 and the second frame body 31 are connected by inserting the groove 212 and the protrusion 310. The first frame 21 has positioning grooves 210 on two short sides. The thickness of the first frame body 21 is 10mm; the thickness of the second frame body 31 is 5mm.

The diaphragm 1 is a rectangular sheet made of Ni-Cu solid solution alloy porous material, the thickness of the sheet is 1000 μm, the length is 125cm, the width is 80cm, the average pore diameter is 30 μm, and the porosity is 61.68%. The membrane module further comprises a frame 4 welded with the peripheral edge of the membrane 1 into a whole, a clamping groove matched with the shape of the frame 4 is arranged on the first frame body 21, and the membrane 1 is hermetically connected with the first frame body 21 by mutually welding the frame 4 and the clamping groove: the thickness of the frame 4 is 1mm.

Example 2

In the flat-plate membrane module of this embodiment, on the basis of embodiment 1, a cylindrical support column 5 with a height of 5mm and a diameter of 5mm perpendicular to the membrane sheet 1 is further provided on the side surface of the second mesh body 32 opposite to the membrane sheet 1, so that the membrane sheet 1 is clamped between the support column 5 of the first mesh body 22 and the support column 5 of the second mesh body 32.

Example 3

As shown in fig. 4, the flat-plate membrane module of this embodiment is based on embodiment 1 or 2, and further provided with cylindrical support columns 5 perpendicular to the membrane sheets 1 and having a height of 5mm and a diameter of 5mm on both sides of the first mesh body 22 and the second mesh body 32.

Claims

1. Plate-type membrane module, including two relative diaphragms (1) and be located two internal support body (2) between diaphragm (1), its characterized in that:

the inner support body (2) comprises a first frame body (21) and a first net body (22) which is bridged on the opposite inner sides of the side edges of the first frame body (21), and the two diaphragms (1) are connected with the first frame body (21) in a sealing mode and are respectively positioned on two sides of the first net body (22);

the diaphragm support structure is characterized by further comprising two outer supports (3) respectively positioned at two sides of the inner support (2), wherein each outer support (3) comprises a second frame body (31) and a second net body (32) bridged on the opposite inner sides of each side edge of the second frame body (31), and the second frame body (31) is fixedly connected with the first frame body (21) and enables the diaphragm (1) to be positioned between the first net body (22) and the second net body (32);

a liquid outlet (211) communicated with the cavity between the two diaphragms (1) is formed in at least one side edge of the first frame body (21), and clear liquid formed after stock solution sequentially passes through the second net body (32) and the diaphragms (1) is collected in the cavity and is discharged from the liquid outlet (211);

a group of opposite side edges of the first frame body (21) are provided with liquid outlets (211); the number of the liquid outlets (211) on the side edge provided with the liquid outlets (211) is at least three and the liquid outlets are distributed at equal intervals;

the membrane (1) is a sheet formed by solid solution alloy, a metal simple substance with a face-centered cubic structure or a metal porous material with a body-centered cubic structure as a matrix phase.

2. The plate membrane module of claim 1, wherein: at least one side surface of the first net body (22) is provided with a supporting column (5) vertical to the membrane (1); at least the side of the second net body (32) opposite to the membrane (1) is provided with a supporting column (5) vertical to the membrane (1).

3. A plate-type membrane module according to claim 2, wherein: the supporting columns (5) are positioned at the intersections of the network cables; the height of the supporting column (5) is 2-5mm.

4. The plate membrane module of claim 1, wherein: the first frame body (21) and the second frame body (31) are connected through a protrusion (310) and a groove (212) which are matched with each other.

5. The plate-type membrane module of claim 1, wherein: the plate-type membrane assembly further comprises a frame (4) welded with the peripheral edge of the membrane (1) into a whole, and the membrane (1) is connected with the first frame body (21) through the frame (4).

6. The plate membrane module of claim 5, wherein: the thickness of the frame (4) is 0.5-2mm.

7. The plate-type membrane module of claim 1, wherein: the thickness of the first frame body (21) is 8-12mm; the thickness of the second frame body (31) is 3-8mm; a positioning groove (210) is arranged on one side edge of the first frame body (21).

8. The plate-type membrane module according to any one of claims 1 to 7, wherein: the plate-type membrane assembly is rectangular in shape.