CN212701380U

CN212701380U - Flat membrane bag and flat membrane component

Info

Publication number: CN212701380U
Application number: CN202021567603.7U
Authority: CN
Inventors: 黄义忠; 何锐; 许文龙; 毛君伟; 吕文星
Original assignee: Jiaxing Liren Environmental Protection Technology Co ltd
Current assignee: Jiaxing Liren Environmental Protection Technology Co ltd
Priority date: 2020-08-01
Filing date: 2020-08-01
Publication date: 2021-03-16
Anticipated expiration: 2030-08-01

Abstract

The utility model discloses a dull and stereotyped membrane bag and dull and stereotyped membrane module, dull and stereotyped membrane bag form the bag body including at least two-layer dull and stereotyped membrane between the adjacent dull and stereotyped membrane, and the bag body is sealing connection formation sealing edge respectively all around, is equipped with the raw water inlet opening of the internal portion of at least one intercommunication bag on the sealing edge. The flat membrane component comprises a shell and a filter element positioned in the shell, wherein the filter element is formed by stacking a plurality of flat membrane bags, a raw water inlet pipe is arranged on the shell, a corresponding raw water inlet part is arranged on the filter element, a raw water inlet opening is respectively positioned at the raw water inlet part, adjacent flat membrane bags at the raw water inlet part are connected through sealant in a sealing manner, the periphery of the raw water inlet part is connected with the inner wall of the shell through the sealant in a sealing manner, a plurality of water production channels are arranged on the filter element, and water production ports respectively communicated with the water production channels are arranged on the shell. The flat membrane component of the utility model has the advantages of large flux, low pressure difference, stable water quality of discharged water, continuous filament and long membrane service life, and has the back washing function.

Description

Flat membrane bag and flat membrane component

Technical Field

The utility model belongs to the technical field of water treatment, concretely relates to dull and stereotyped membrane bag, dull and stereotyped membrane module.

Background

Currently there are three main membrane structure forms in the field of membrane filtration and separation: hollow fiber, flat and tubular modes. The hollow fiber membrane has the main advantages of back flushing, the tubular membrane has the main advantages of high suspended matter resistance, and the flat membrane has the main advantages of large flux, low pressure difference and few membrane pore defects. Flat sheet membranes are put into practical use as filtration units or modules in various forms due to the above-mentioned advantages: the membrane filter element comprises a dead-end filtration membrane filter element and is applied to liquid clarification and sterilization filtration; the cross-flow type flat plate ultrafilter is applied to material separation and concentration; the spiral-wound membrane module is applied to filtering, separating and concentrating water and materials.

However, the above membrane units or modules have some disadvantages, for example, the membrane filter core for dead-end filtration is generally disposable and high in cost; the roll-type membrane generally cannot realize back washing, and the advantage of large flux cannot be exerted due to the limitation of the central pipe; the cross-flow flat plate ultrafilter has high initial investment and is not suitable for a large-flow water treatment process.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present application is directed to a flat membrane module, which can exert the advantages of a flat membrane, such as large flux and low pressure difference, and has a back-washing function like a hollow fiber membrane, and can be applied to water and aqueous solution filtration.

In order to achieve the above object, the utility model adopts the following technical scheme: dull and stereotyped membrane bag is including at least two-layer dull and stereotyped membrane, forms the bag body between the adjacent dull and stereotyped membrane, and the bag body is sealing connection respectively all around and forms the sealed limit, is equipped with the raw water inlet opening of at least one intercommunication internal portion of bag on the sealed limit, dull and stereotyped membrane is including separation layer and supporting layer, the separation layer is located the internal side of bag.

Preferably, the bag body is provided with a raw water diversion net therein.

Preferably, the width of the sealing edge is 1-10 mm.

Preferably, the thickness of the raw water diversion net is 0.5-2.5 mm.

The flat membrane component comprises a shell and a filter element positioned in the shell, wherein the filter element comprises a plurality of flat membrane bags, the flat membrane bags are sequentially stacked in the thickness direction of the flat membrane bags to form the filter element, the shell is provided with a plurality of raw water inlet pipes communicated with the interior of the shell, the filter element is provided with a plurality of raw water inlet parts, raw water inlet openings in the flat membrane bags are respectively positioned at the raw water inlet parts, the raw water inlet parts are in one-to-one correspondence with the raw water inlet pipes, adjacent flat membrane bags in the raw water inlet parts are in sealed connection through sealant, the periphery of the raw water inlet parts is in sealed connection with the inner wall of the shell through the sealant, the filter element is provided with a plurality of water production channels, the water production channels sequentially penetrate through all the flat membrane bags and respectively form a water collection opening on each flat membrane bag, and the water collection openings are isolated from the interiors, the shell is provided with a plurality of water producing ports which are respectively communicated with the water producing channel.

Preferably, the casing is a circular tube with sealing covers at two ends, the filter element is cylindrical, the thickness direction of the flat membrane bag is perpendicular to the axis of the circular tube, two ends of the circular tube are respectively provided with a raw water inlet pipe, two ends of the filter element are respectively arranged as a raw water inlet part, and the number of the water production channels is two.

Preferably, the filter element is provided with sealing grooves at two ends thereof, the sealing grooves are respectively communicated with corresponding communicated water production channels, connecting pipes are inserted into the sealing grooves and are respectively connected with water production ports, notches are arranged on edges of part of the flat membrane bags in the filter element, the sealing grooves are formed by overlapping the notches of the stacked flat membrane bags, and the notches are isolated from the interior of the bag body through sealing lines around the notches.

Preferably, a water production flow guide net is arranged between adjacent flat membrane bags in the filter element.

Preferably, the filter element is provided with a mesh grid on the outer side.

Preferably, in each flat membrane bag, the number of the flat membranes is two.

The utility model has the advantages that: the utility model discloses a dull and stereotyped membrane module, full play dull and stereotyped membrane large flux, the advantage that pressure differential is low, have the back flush function like hollow fiber membrane simultaneously. Can be applied to the fields of water body and aqueous solution filtration, such as RO membrane protection and the like. Compared with the hollow fiber membrane component conventionally used at present, the utility model discloses a flat membrane component flux is big, and pressure differential is low, goes out water stable in quality of water, continuous silk, and the membrane is longe-lived.

Drawings

FIG. 1 is a schematic cross-sectional structure of a flat sheet membrane bag;

FIG. 2 is a schematic diagram of the structure of a notch on a flat sheet membrane bag;

FIG. 3 is a schematic view of the structure of a water collection opening on a flat sheet membrane bag;

FIG. 4 is a schematic structural diagram of a flat membrane bag and a produced water diversion net in a flat membrane module;

FIG. 5 is a schematic structural view of a flat membrane module according to the present invention;

FIG. 6 is a schematic cross-sectional view of a flat sheet membrane module of the present invention;

fig. 7 is a schematic view of the end of the cartridge.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1-3, the flat membrane bag 18 includes two flat membranes 1, a bag body 2 is formed between the adjacent flat membranes 1, the peripheries of the bag bodies 2 are respectively connected in a sealing manner to form a sealing edge 3, at least one raw water inlet opening 4 communicated with the bag body 2 is formed in the sealing edge 3, the flat membrane 1 includes a separation layer and a support layer, and the separation layer is located on the inner side of the bag body 2. Further, a raw water diversion net 5 is arranged in the bag body 2. Further, the width of the sealing edge is 1-10 mm. Furthermore, the thickness of the raw water diversion net is between 0.5 and 2.5 millimeters. Raw water to be treated enters the bag body 2 from the raw water inlet opening 4, and the raw water permeates out of the bag body 2 through the filtering treatment effect of the flat membrane 1 to form water production. The raw water guide net 5 is beneficial to the circulation of raw water in the bag body 2.

Example two

As shown in fig. 1-7, a 4-inch microfiltration flat membrane module comprises a housing 6 and a filter element positioned in the housing 6. The shell is a round tube with two ends provided with sealing covers 7. A PVDF microfiltration membrane flat membrane 1 with the filtration precision of 0.1 micron on the market and a water production diversion net 10 made of a PP material with the thickness of 36mil are adopted, and a plurality of flat membrane bags 18 with the lengths of 1 meter and the widths of 9.5 cm, 9 cm, 8 cm, 7 cm, 6 cm, 5 cm, 4 cm, 3 cm and 2 cm are welded in a hot-melt welding mode. The width of the flat membrane bag 18 and the width of the produced water diversion net 10 are in step change, the step amplitude value is too large, the integrity of the circular section is not good, the step amplitude value is too small, and the production is more complicated. The flat membrane bags 18 comprise two layers of micro-filtration membrane flat membranes 1. The raw water inlet openings 4 of the flat membrane bag 18 are respectively positioned at two ends of the flat membrane bag 18, and the width of the raw water inlet openings 4 is respectively consistent with that of the bag body 2. The sealed edge 3 of the flat membrane bag 18 is 5 cm wide. A notch 8 with the depth of 8 cm and the width of 3 cm is respectively arranged at the upper end and the lower end of a flat membrane bag 18 with the width of 9.5 cm, 8 cm and 7 cm, and a sealing edge 3 is welded at the periphery of the notch 8. Two ends of a flat membrane bag 18 with the width of 5 cm to 2 cm are respectively provided with a closed hole with the diameter of 1 cm to be used as a water collecting opening 9 for water production and diversion, and the water collecting opening 9 also plays a role in assisting the encapsulation of sealant. The flat membrane bags 18 were alternately stacked with the same width of the water-producing drainage net 10 (thickness 0.25 mm) to form a cylindrical stack having a cross section similar to a circle, the diameter of the circular cross section of the stack being 9.5 cm. Two ends of adjacent flat membrane bags 18 are sealed, adhered and fixed through a sealant 11, and the produced water diversion net 10 is fixedly clamped between the adjacent flat membrane bags 18. The stack was wrapped with a woven mesh 12 of 3 x 3 mm glass fiber mesh 1 mm thick to form a cylindrical filter element with a diameter of approximately 10 cm. The mesh grid 12 is used for reinforcing the filter element on one hand, preventing the stack from collapsing, on the other hand, the diameter of the filter element is similar to the internal structure of the shell 6, the filter element can be just placed in the shell 6, and the filter element cannot be disassembled during backwashing. The filter element is placed in the shell 6, the two ends of the shell 6 are covered with the sealing covers, and the peripheries of the two ends of the filter element are hermetically connected with the inner wall of the circular tube through the sealant 11. A raw water inlet part 13 is formed between the sealing cover 7 and the two ends of the filter element. The sealing covers 7 are respectively provided with a raw water inlet pipe 14 communicated with the raw water inlet part 13. Notches 8 at two ends of a flat membrane bag 18 form grooves 15 at two ends of the filter element respectively, the upper parts of the grooves 15 are fixedly connected with a connecting pipe 16 through sealant 11, and one end of the connecting pipe 16 extends out of a sealing cover 7 to form a water producing port 17. The lower part of the groove 15 and other water collecting openings form two water producing channels 19 at two ends of the interior of the filter element respectively. Raw water enters the raw water inlet part 13 from the raw water inlet pipe 14, then enters each bag body 2 from the raw water inlet opening 4 respectively, is filtered by the flat membrane bags 18, and produced water is gathered to the water producing channel 19 from the gap between the adjacent flat membrane bags 18 and then is produced from the water producing port 17 through the connecting pipe 16. The water production diversion net 10 prevents the adjacent flat membrane bags 18 from being attached under the water pressure to influence the water production efficiency.

In the actual production process, the flat membrane bag 18 may be thermally welded to form the sealing edge 3 without a raw water inlet opening being reserved in advance. After the filter element is assembled by using the sealant, the two ends of the filter element are cut, and the sealing edges 4 at the two ends of the filter element are cut off, so that the two ends of each flat membrane bag 18 can form a raw water inlet opening 4 communicated with the interior of the bag body. The advantage of operation like this can avoid sealing glue to glue raw water inlet opening 4 in the equipment filter core in-process, improves filter core production efficiency. And packaging and cutting to obtain a filter element, and finally assembling the shell 6 and the sealing cover 7 to obtain the flat membrane microfiltration component capable of backwashing, wherein the effective area of the flat membrane microfiltration component is 8 square meters.

The membrane module is tested by municipal tap water, under the pressure of 0.1 kilogram, the water permeability reaches 2 tons per hour, and the turbidity of the effluent is less than 0.1 NTU. It can be seen that the flat ultrafiltration membrane has high flux and low pressure difference. The membrane module was back flushed with water for 30 seconds and forward flushed for 30 seconds (water volumes were 2 tons per hour) every 1 hour of operation, and was operated again. In 8 periods, the water yield and the initial pressure difference of the membrane are kept unchanged, and the membrane module has very good backwashing regeneration capacity.

EXAMPLE III

8-inch ultrafiltration membrane flat membrane component

As shown in fig. 1-7, a PVDF microfiltration membrane flat membrane 1 with a filtration precision of 0.03 micron on the market and a raw water diversion net 5 made of PP with a thickness of 36mil are adopted, and a plurality of flat membrane bags 18 with a length of 1 meter and a width of 19.5 cm-2 cm are welded by a hot-melt welding method. The width of the flat membrane bag 18 and the width of the produced water diversion net 10 are changed in a step mode, and the width decreasing gradient is 1 cm. The flat membrane bags 18 comprise two layers of micro-filtration membrane flat membranes 1. The raw water inlet openings 4 of the flat membrane bag 18 are respectively positioned at two ends of the flat membrane bag 18, and the width of the raw water inlet openings 4 is respectively consistent with that of the bag body 2. The sealed edge 3 of the flat membrane bag 18 is 5 cm wide.

A notch 8 with the depth of 10 cm and the width of 6 cm is arranged at the upper end and the lower end of a flat membrane bag 18 with the width of 19.5 cm to 14 cm, and a sealing edge 3 is welded around the notch 8. A closed hole with the diameter of 3 cm is formed in a flat membrane bag with the width of 13 cm to 6 cm, and a closed hole with the diameter of 1 cm is formed in a flat membrane bag 18 with the width of 5 cm to 2 cm. The closed hole is used as a water collecting opening 9 for water production and diversion, and the water collecting opening 9 also plays a role in assisting sealing glue encapsulation. The flat membrane bags 18 are stacked alternately with the water-producing drainage nets 10 of the same width to form a cylindrical stack with a cross section similar to a circle, the diameter of the stack is about 19.5 cm, and the thickness of the water-producing drainage net is 0.25 mm. The stack was wrapped with a woven mesh 12 of 3 x 3 mm glass fibre mesh having a thickness of 1 mm to form a filter element having a diameter of approximately 20 cm. The rest of the packaging steps and the method are the same as those in the second embodiment, and finally the ultrafiltration membrane flat membrane component with the effective area of 32 square meters is formed.

The ultrafiltration membrane flat membrane component and a commercially available hollow membrane component with the area of 0.03 micrometer and 55 square meters are applied to a municipal tap water filtration comparison test, and 8 cycles of filtration and backwashing experiments are carried out under the same pressure difference, so that the flow of the ultrafiltration membrane flat membrane component is 50 percent larger, and the turbidity of effluent is not obviously different.

It is worth mentioning that the technical features of the flat membrane, the hollow membrane module, the glass fiber net and the like related to the patent application of the present invention should be regarded as the prior art, and the specific structure, the working principle of the technical features and the control mode and the space arrangement mode which may be related to adopt the conventional selection in the field, which should not be regarded as the invention point of the present invention, and the present invention does not further specifically expand the detailed description.

Having described in detail preferred embodiments of the present invention, it is to be understood that modifications and variations can be made by persons skilled in the art without inventive faculty, and therefore all technical solutions which can be obtained by a person skilled in the art based on the concepts of the present invention through logic analysis, reasoning or limited experimentation will fall within the scope of protection defined by the claims.

Claims

1. Dull and stereotyped membrane bag, its characterized in that forms the bag body between the adjacent dull and stereotyped membrane including at least two-layer dull and stereotyped membrane, and the bag body is sealing connection respectively all around and forms the sealing edge, is equipped with the raw water inlet opening of at least one intercommunication internal portion of bag on the sealing edge, dull and stereotyped membrane is including separation layer and supporting layer, the separation layer is located the internal side of bag.

2. The flat sheet membrane bag according to claim 1, wherein: the bag body is internally provided with a raw water diversion net.

3. The flat sheet membrane bag according to claim 1, wherein: the width of the sealing edge is 1-10 mm.

4. The flat sheet membrane bag according to claim 2, wherein: the thickness of the raw water diversion net is between 0.5 and 2.5 millimeters.

5. The flat membrane component is characterized in that: the filter element comprises a shell and a filter element positioned in the shell, wherein the filter element comprises a plurality of flat membrane bags as claimed in any one of claims 1 to 4, the flat membrane bags are sequentially stacked in the thickness direction of the flat membrane bags to form the filter element, the shell is provided with a plurality of raw water inlet pipes communicated with the inside of the shell, the filter element is provided with a plurality of raw water inlet parts, raw water inlet openings in the flat membrane bags are respectively positioned at the raw water inlet parts, the raw water inlet parts are in one-to-one correspondence with the raw water inlet pipes, adjacent flat membrane bags at the raw water inlet parts are hermetically connected through sealant, the periphery of the raw water inlet parts is hermetically connected with the inner wall of the shell through the sealant, the filter element is provided with a plurality of water production channels, the water production channels sequentially penetrate through all the flat membrane bags and respectively form a water collection opening on each flat membrane bag, and the water collection openings are isolated from the insides of, the shell is provided with a plurality of water producing ports which are respectively communicated with the water producing channel.

6. The flat sheet membrane module of claim 5, wherein: the casing is the pipe that both ends were equipped with sealed lid, the filter core is cylindric, the thickness direction perpendicular to axis of pipe of dull and stereotyped membrane bag, and the both ends of pipe are equipped with a raw water inlet tube respectively, and the raw water portion of intaking is established respectively to the both ends of filter core, and the quantity of producing the water passageway is two.

7. The flat sheet membrane module according to claim 6, wherein: the filter element is characterized in that two ends of the filter element are respectively provided with a sealing groove, the sealing grooves are respectively communicated with corresponding communicated water production channels, a connecting pipe is inserted in each sealing groove and is respectively connected with a water production port, notches are arranged on the edges of part of the flat membrane bags in the filter element, each sealing groove is formed by overlapping the notches of the stacked flat membrane bags, and each notch is isolated from the inside of the bag body through a sealing line around each notch.

8. The flat sheet membrane module of claim 7, wherein: and a water production flow guide net is arranged between adjacent flat membrane bags in the filter element.

9. The flat sheet membrane module of claim 8, wherein: and a woven net is arranged on the outer side of the filter element.

10. The flat sheet membrane module of claim 9, wherein: the number of the flat membranes in each flat membrane bag is two.