CN115253692A - Membrane element, production method of membrane element and roll-type membrane module - Google Patents
Membrane element, production method of membrane element and roll-type membrane module Download PDFInfo
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- CN115253692A CN115253692A CN202210715626.5A CN202210715626A CN115253692A CN 115253692 A CN115253692 A CN 115253692A CN 202210715626 A CN202210715626 A CN 202210715626A CN 115253692 A CN115253692 A CN 115253692A
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- 239000012528 membrane Substances 0.000 title claims abstract description 315
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 304
- 239000004744 fabric Substances 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 7
- 239000012141 concentrate Substances 0.000 claims description 50
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/061—Manufacturing thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/04—Tubular membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/04—Specific sealing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/08—Flow guidance means within the module or the apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The application provides a membrane element, a production method of the membrane element and a roll-type membrane module. The membrane element includes: a raw water pipe; a concentrated water pipe; the membrane bag comprises a membrane for filtration, part of raw water passes through the membrane to become produced water and enters the water production flow passage cloth, and the raw water which cannot pass through the membrane becomes concentrated water and enters the concentrated water pipe. The production method of the membrane element comprises the step of winding the membrane bag on the raw water pipe. A wound membrane module includes a plurality of axially connected membrane elements. This application has changed the filtration logic of traditional membrane group component, makes the raw water get into from the raw water pipe to can follow the even membrane pocket that gets into of raw water pipe's circumference, it is uneven to have improved the raw water distribution in the membrane element, and the membrane element is the high pressure resistant problem not, has improved the pressure resistance, and the membrane element is difficult for revealing.
Description
Technical Field
The application belongs to the technical field of membrane separation in the field of pollution prevention and control equipment, and particularly relates to a membrane element, a production method of the membrane element and a spiral-wound membrane module.
Background
Water is a spring of life and an important resource for human survival. However, with the development of industrialization, the discharge amount of high salinity wastewater tends to increase. The discharge amount of the high-salt wastewater accounts for more than 5 percent of the total discharge amount of the wastewater, and currently, the discharge amount of the high-salt wastewater rises at a rate of 2 percent per year. The high-salinity wastewater mainly comes from the fields of printing and dyeing, chemical industry, pharmacy and the like. At present, high-salt-content wastewater is always a difficult point and a hot point in the wastewater treatment industry.
In recent years, due to rapid development of membrane separation technology, membrane water treatment technology is gradually developed to treat high-salt wastewater, the treatment effect of the membrane water treatment technology exceeds that of the traditional thermal concentration technology, and membrane separation is a green and efficient physical separation technology, is suitable for treatment and recycling of industrial wastewater and is widely applied to treatment of high-salt wastewater.
Further requirements are provided for the aspects of wastewater treatment and reuse, town sewage treatment, seawater desalination and the like. Some special industries, such as printing and dyeing wastewater, landfill leachate, salt lake lithium extraction, strong brine zero discharge and other fields, put higher demands on the performance (high pressure resistance, pollution resistance and other aspects) of membrane elements.
Disclosure of Invention
The application provides a membrane element, a production method of the membrane element and a roll-type membrane module.
The membrane element is used for filtering raw water to produce concentrated water and produced water, and comprises:
the device comprises a raw water pipe, wherein an exchange channel is arranged on the peripheral surface of the raw water pipe;
the peripheral surface of the concentrated water pipe is provided with an exchange channel; and
the membrane bag and the water production flow passage cloth are at least partially wound on the outer side of the raw water pipe,
the membrane bag comprises a membrane sheet for filtration,
the membrane bag is characterized in that a raw water inlet is defined at one axial end of the raw water pipe, so that raw water entering the raw water pipe from the raw water inlet can enter the membrane bag from an exchange channel of the raw water pipe, part of the raw water passes through the membrane to become produced water and enters the produced water flow channel cloth, and raw water which cannot pass through the membrane becomes concentrated water and enters the concentrated water pipe from an exchange channel of the concentrated water pipe.
In at least one embodiment, the membrane bag includes a network of influent channels and the membrane sheets disposed on both sides of the network of influent channels seal the network of influent channels within the membrane sheets.
In at least one embodiment, both ends of the water inlet flow passage net are respectively wound around the raw water pipe and the concentrated water pipe.
In at least one embodiment, the circumferential end of the influent channel network is wound around the raw water pipe, and the membrane is not disposed between the influent channel network and the raw water pipe in at least a partial region of the raw water pipe in the circumferential direction.
In at least one embodiment, the circumferential other end of the network of penstocks is wound around the concentrate pipe, without the membrane between the network of penstocks and the concentrate pipe in at least a partial region of the circumference of the concentrate pipe.
In at least one embodiment, the concentrated water flows out of the membrane elements from the concentrated water pipe, and the produced water flows out of the membrane elements from the produced water flow passage cloth in the axial direction of the membrane elements.
In at least one embodiment, the exchange channels of the raw water pipes are uniformly arranged in the raw water pipes, and the exchange channels of the concentrated water pipes are uniformly arranged in the concentrated water pipes.
In at least one embodiment, the exchange channel on the raw water pipe and/or the concentrated water pipe comprises:
one or more through slots; and/or
One or more rows of through holes.
In at least one embodiment, the raw water pipe is located on the axis of the membrane element.
In at least one embodiment, the membrane element further comprises a membrane element enclosure located at an outermost side of the membrane element and an end cap disposed at one or both ends of the membrane element enclosure.
The production method of the membrane element provided by the application comprises the following steps:
providing a raw water pipe with an exchange channel on the peripheral surface, and providing an exchange channel concentrated water pipe, a membrane and a water inlet flow passage network on the peripheral surface;
sealing the water inlet runner net between two layers of membrane sheets to form a membrane bag;
winding the membrane bag at least partially on the outer side of the raw water pipe, so that one circumferential end of the water inlet runner network is wound on the raw water pipe, and the membrane is not arranged between the water inlet runner network and the raw water pipe in at least partial region of the raw water pipe in the circumferential direction; and
winding the membrane bag partially around the outside of the concentrate pipe, so that the other circumferential end of the influent conduit network is wound around the concentrate pipe, and at least part of the circumferential area of the concentrate pipe is not provided with the membrane between the influent conduit network and the concentrate pipe.
In at least one embodiment, the inlet flow path network is longer than the membrane sheet inside the inlet flow path network by one circumference or more of the raw water pipe at the circumferential end of the membrane bag wound outside the raw water pipe, and/or
The membrane bag is wound on one end of the outer side of the raw water pipe in the circumferential direction, and the membrane outside the water inlet runner network is longer than the water inlet runner network or is flush with the water inlet runner network.
In at least one embodiment, the inlet runner network is longer than the membrane sheet inside the inlet runner network by one circumference of the concentrate pipe or more at the other circumferential end of the membrane bag wound outside the concentrate pipe, and/or
The membrane bag is wound on the other end of the outer side of the concentrated water pipe in the circumferential direction, and the membrane outside the water inlet runner network is longer than the water inlet runner network or is flush with the water inlet runner network.
In at least one embodiment, the production method comprises:
providing two membranes, and fixedly connecting two side edges of the water inlet runner network, which are positioned at two axial ends of the raw water pipe, to two side edges of the two membranes, which are positioned at two axial ends of the raw water pipe; and
and correspondingly connecting four sides of the two membranes, so that the water inlet runner network is sealed in the two membranes.
In at least one embodiment, the production method comprises:
before the membrane bag is wound on the raw water pipe or the concentrated water pipe, two side edges of the water inlet runner network, which are positioned at two axial ends of the raw water pipe, are hermetically connected with two side edges of the two membranes, which are positioned at two axial ends of the raw water pipe, through gluing or ultrasonic welding.
In at least one embodiment, the production method comprises:
providing a single membrane, folding the membrane in half, clamping the water inlet runner net between two layers of membranes, and fixedly connecting two side edges of the water inlet runner net, which are positioned at two axial ends of the raw water pipe, to two side edges of the membrane, which are positioned at two axial ends of the raw water pipe; and
and correspondingly connecting the other edges of the single membrane, so that the water inlet runner network is sealed in the single membrane.
The present application provides a wound membrane module comprising:
the membrane element as described above; and
a system housing having a plurality of the membrane elements axially connected disposed therein.
In at least one embodiment, a sealing ring is disposed between the membrane element and the system housing.
In at least one embodiment, the wound membrane module further comprises:
one or more raw water diversion passages, one of which is connected to an upstream end of the raw water pipe of one of the membrane elements at the most upstream in a direction in which water flows in the axial direction of the wound membrane module, and/or adjacent ends of the adjacent raw water pipes are connected by one or more raw water diversion passages;
one or more concentrate drainage channels connecting adjacent ends of the adjacent concentrate pipes with the one or more concentrate drainage channels in the direction of axial flow of water along the rolled membrane module, and/or connecting one of the concentrate drainage channels at a downstream end of the concentrate pipe of a most downstream one of the membrane elements.
In at least one embodiment, the wound membrane module further comprises:
a product water diversion channel connected to a downstream end of the system housing.
In at least one embodiment, the system housing includes an intermediate cylindrical housing and a downstream axial end cap leaving a water storage space between a downstream end of a most downstream one of the membrane elements and the downstream axial end cap, the water production drainage channel being connected to the downstream axial end cap and communicating with the water storage space.
The water inlet mode of the traditional roll-type membrane element is that water enters from a central pipe (a raw water pipe), and the raw water flows into a membrane pocket after bearing in the central pipe. This application has changed the filtration logic of membrane element promptly, makes the raw water get into from the former water pipe to can follow the even membrane pocket that gets into of the circumference of former water pipe, improve the former water distribution in the membrane element uneven, the membrane element is not high pressure resistant problem, has improved the pressure resistance, and the membrane element is difficult for revealing.
Drawings
Fig. 1 shows a schematic structural view of a membrane element of a roll-type membrane module according to an embodiment of the present application.
Fig. 2 shows a cross-sectional view of a membrane element of a wound membrane module according to an embodiment of the application.
Fig. 3 shows a schematic structural view of a raw water pipe or a concentrate pipe of a membrane element of a wound membrane module according to an embodiment of the present application.
Fig. 4 shows a schematic structural view of a raw water pipe or a concentrated water pipe of a membrane element of a wound membrane module according to another embodiment of the present application.
Fig. 5 shows a schematic structural view of a membrane bag and a water production flow passage cloth of a membrane element of a rolled membrane module according to an embodiment of the present application.
Fig. 6 shows a schematic structural view of a membrane bag of a membrane element of a roll-type membrane module according to an embodiment of the present application in an unfolded state.
Fig. 7 shows a cross-sectional view of the raw water pipe and the concentrate pipe in fig. 6.
Fig. 8 shows a schematic structural view of a rolled membrane module according to an embodiment of the present application.
Description of the reference numerals
1, a membrane element; 2, a raw water pipe; 3, a concentrated water pipe; 4, a through groove; 5, a through hole; 6, film bag; 61 a network of inlet channels; 62 a diaphragm; 7, producing water flow channel cloth; 8 a membrane element housing; 9 end covers; 10 a system housing; 11, a sealing ring; 12 a raw water drainage channel; 13 a concentrated water drainage channel; 14 water drainage channels.
Detailed Description
Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.
Embodiments of the present application provide a membrane element, a production method of a membrane element, and a roll-up membrane module. The spiral wound membrane module comprises a membrane element 1. The raw water can be filtered by the membrane element 1 to form concentrated water and produced water.
Referring to fig. 1 and 2, a membrane element 1 includes a raw water pipe 2 and a concentrated water pipe 3. The raw water pipe 2 and the concentrated water pipe 3 can be made of polysulfone, ABS (acrylonitrile-butadiene-styrene ternary block copolymer), polyformaldehyde, nylon, polycarbonate or stainless steel. Referring to fig. 3, 4, the peripheral walls of the raw water pipe 2 and the concentrate pipe 3 may be provided with exchange passages, such as through-grooves 4 or through-holes 5, so that water can flow into or out of the concentrate pipe 3 and the raw water pipe 2 from the exchange passages. For example, water flows out of the raw water pipe 2 from the exchange passage, water flows into the rich water pipe 3 from the exchange passage, and the like. In one embodiment of the present application, the pipe diameter of the raw water pipe 2 may be equal to or greater than the pipe diameter of the concentrate pipe 3, and the ratio of the inner diameters thereof may be, for example, 1:1 to 1.5:1. the exchange passages may be uniformly provided in the peripheral wall of the pipes (raw water pipe 2, concentrated water pipe 3). The exchange channel may comprise a plurality of through slots 4, or a plurality of columns of through holes 5, or both one or more through slots 4 and a plurality of through holes 5.
Referring to fig. 5, 6 and 7, the membrane element 1 further includes a membrane bag 6 and a water production flow path cloth 7, and the water production flow path cloth 7 may be provided at one side of the membrane bag 6. The membrane bag 6 and the water-producing flow path cloth 7 are connected at both ends thereof to the raw water pipe 2 and the concentrated water pipe 3, respectively, and the raw water pipe 2 may be used as a center pipe, and the membrane bag 6 and the water-producing flow path cloth 7 may be wound around the raw water pipe 2 in a manner of a roll so that the raw water pipe 2 is positioned (including substantially positioned) on the axis of the membrane element 1. Of course, the concentrated water pipe 3 can also be wound with part of the membrane bag 6 and the water production flow path cloth 7.
The membrane bag 6 comprises a network of penstocks 61 and membranes 62 arranged on either side of the network of penstocks 61. The inlet flow path net 61 may be wound around the raw water pipe 2 and the concentrated water pipe 3 for one or more circles (the inner side of the inlet flow path net 61, i.e. the side facing the raw water pipe 2 or the concentrated water pipe 3, is not provided with the membrane 62), and the inlet flow path net 61 is sealed by the membrane 62, so that the raw water of the raw water pipe 2 can be directly introduced into the membrane bag 6 (i.e. enter between the two layers of membranes 62). The application is not limited to a particular type of membrane 62, for example, the membrane 62 may be a nanofiltration membrane, a reverse osmosis membrane, or the like.
Of course, the inlet network 61 can be wound around the raw water pipe 2 and the concentrate pipe 3 for less than one turn, and can still function, although it is not the most preferred embodiment. It is understood that at least some regions between the inlet flow network 61 and the raw water pipe 2 and the concentrate pipe 3 do not have the membrane 62. Illustratively, two membranes 62 may be provided, with the network of influent flow channels 61 sealed therein, to form the membrane bag 6. For example, at the circumferential end of the membrane bag 6 that is wrapped around the outside of the raw water pipe 2, the catchment channel net 61 is longer than the membrane sheet 62 inside the catchment channel net 61 by one circumference of the raw water pipe 2 or more, and/or at the circumferential end of the membrane bag that is wrapped around the outside of the raw water pipe 2, the membrane sheet 62 outside the catchment channel net 61 is longer than the catchment channel net 61 or is flush with the catchment channel net 61. Of course, the membranes 62 on both the inside and outside of the influent channel network 61 may be shorter than the influent channel network 61, so that the influent channel network 61 can be sealed by the membranes 62. The concentrated water pipe 3 is treated in the same way.
Alternatively, a single membrane 62 may be provided, the membrane 62 is folded in half and then disposed on the outside of the inlet network 61 (i.e., the inlet network 61 is sandwiched between two layers of the membrane 62 formed by folding in half), and three edges of the membrane on both sides of the fold of the membrane 62 are sealed together correspondingly to form the membrane bag 6. The sealing method can be gluing, ultrasonic welding and the like. It will be appreciated that the functional face of the membrane sheet 62 in the membrane bag 6 faces the inwardly located network of inlet channels 61.
This application sets up inhalant canal net 61 sealed among diaphragm 62, and with inhalant canal net 61's both ends (circumference both ends or called length direction both ends) direct fixed connection in former water pipe 2 and dense water pipe 3 for inhalant canal net 61's fixed effect is better. The phenomenon that the water inlet runner net in the prior art cannot be fixed on two sides (the prior art lacks a concentrated water pipe) is avoided, and the phenomenon that the water inlet runner net 61 is easy to be washed out of a membrane element or damaged due to the fact that the water inlet runner net is likely to slide when the water pressure is too high is avoided. Moreover, only one film bag can be used in the application, so that the problems that a plurality of film bag stacking schemes in the prior art are easy to slide relatively, the rolling process is complex and the yield is low are solved.
The working principle of the membrane element in this application is: raw water enters the membrane element 1 from one end of the raw water pipe 2 (e.g., the left end in fig. 2, which serves as a raw water inlet), and the other end of the raw water pipe 2 is blocked (e.g., the right side in fig. 2); raw water uniformly enters a filtering area formed by the membrane bags 6 through an exchange channel on the peripheral wall of the raw water pipe 2; a part of water is intercepted into the membrane bag 6 to form concentrated water, and the concentrated water enters the concentrated water pipe 3 along the water inlet runner net 61 in the membrane bag 6; the water that can pass through the membrane bag 6 (passing through the membrane sheet 62 in the thickness direction of the membrane sheet 62) is produced water, and is discharged from the produced water flow path cloth 7 in the axial direction of the membrane element 1.
It can be understood that in the prior art, raw water enters the water inlet flow channel network from the axial end face side of the membrane element, and under the action of pressure, a part of raw water in the water inlet flow channel network enters the membrane bag along the radial direction of the membrane element to form produced water, flows into the central tube with the through hole along with the membrane bag and flows out from the axial direction of the central tube; the water that has failed to enter the membrane bag is concentrated water and flows out from the other end face of the membrane element in the axial direction of the membrane element. The flow path from one end face to the other end face is long, and when the raw water is high-salt water, the concentration polarization phenomenon of the membrane bag is serious, which may cause the channel of the membrane to be blocked, the membrane flux to be reduced, and the water pressure in the membrane element to be high. Under high pressure, the water inlet flow channel net in the membrane bag is easy to be flushed out, one surface of the end surface is collapsed, the other surface is protruded, even a telescope phenomenon (the middle of a membrane cylinder spirally wound into a column shape is protruded like an elongated telescope) occurs, and membrane elements are damaged. Resulting in leakage of the membrane element and shortening of the service life of the membrane element.
And the raw water of this application flows to the membrane bag 6 that sets up in the raw water pipe 2 outside from the exchange passageway of raw water pipe 2 on average, compare in prior art and can balance the pressure of intaking, improved the compressive capacity of membrane element 1 moreover, the design of exchange passageway (logical groove 4, through-hole 5 etc.) makes the raw water can form the torrent after getting into membrane bag 6 from raw water pipe 2, increase the velocity of water flow, reduce the pollution degree of diaphragm 62, and then increase the compressive capacity of membrane element 1, increase the life of membrane element 1.
Among the prior art, produce the scheme that water need collect to the center tube and make a plurality of membrane bags of prior art all need set up the primer, prevent to produce the outflow. And only a single membrane bag 6 is used in the application, the area of the membrane bag 6 needing gluing is relatively less (the gluing amount of the single membrane bending embodiment is less), so that the effective area of the membrane 62 in the membrane bag 6 is larger, and the filtering efficiency is higher.
Illustratively, membrane sheets of the same length are selected and conventionally made into 25-leaf membrane bags, which are rolled in a conventional rolling manner to provide membrane elements having an effective membrane area of 380 square feet (ft)2) (ii) a By adopting the structure of the membrane element 1, the membrane sheet is made into a single-page membrane pocket, the base glue of each page when the traditional membrane element is rolled is reduced, and the effective membrane area of the membrane element 1 reaches 415 square feet (ft)2) The effective area of the membrane is improved by 9.2 percent, namely, more raw water can be treated, and the efficiency is higher.
Referring to fig. 1, 2, the membrane element 1 can further comprise a membrane element housing 8 and an end cap 9. The membrane element housing 8 is located at the outermost side of the membrane element 1. The membrane element shell 8 is provided with end covers 9 at two ends, so that the membrane element 1 can be fixed into a whole. The membrane element shell 8 can play a role in protection and improve the overall compression resistance of the membrane element, and the membrane element shell 8 can be made of glass fiber reinforced plastics, heat shrinkable tubes, corrugated tubes or thermoplastic elastomers and the like. Of course, the end cap 9 can be provided with a passage aligned with the raw water pipe 2 and the concentrate pipe 3, and the membrane element housing 8 can be closed at one end so that the membrane element 1 is provided with the end cap 9 only at the other end.
Referring to fig. 8, the rolled membrane module may further comprise a system housing 10, and a plurality of membrane elements 1 may be axially connected and mounted inside the system housing 10. The outer peripheral surface of the end cap 9 of the membrane element 1 may be provided with a sealing ring 11, which may be an O-ring, a Y-ring, or the like, that functions to seal the membrane element 1 to the system housing 9. The system shell 10 can also be provided with a raw water drainage channel 12, a concentrated water drainage channel 13 and a produced water drainage channel 14. Raw water can be added into the raw water pipe 2 through the raw water drainage channel 12, concentrated water in the concentrated water pipe 3 is led out through the concentrated water drainage channel 13, and produced water gathered at one end of the system shell 10 can be led out through the produced water drainage channel 14.
The raw water diversion passage 12, the concentrated water diversion passage 13, and the produced water diversion passage 14 may each include or be constituted by a pipe member.
In the direction of the water flowing along the axial direction of the rolled membrane module, the upstream end of the raw water pipe 2 of the most upstream membrane element 1 can be connected with a raw water drainage channel 12 for introducing raw water; connecting the adjacent ends of the adjacent raw water pipes 2 by one or more raw water diversion channels 12; the downstream end of the raw water tube 2 of the most downstream membrane element 1 is closed.
The upstream end of the concentrate pipe 3 of the most upstream one membrane element 1 may be closed in the direction of the axial flow of water along the wound membrane module; connecting the adjacent ends of adjacent concentrate pipes 3 by one or more concentrate drainage channels 13; the downstream end of the concentrate pipe 3 of the most downstream membrane element 1 is connected with a concentrate drainage channel 13 for leading out concentrate.
A product water diversion channel 14 may be connected at the downstream end of the system housing 10.
The system housing 10 can include an intermediate cylindrical housing and two axial end caps, and a water storage space can be left between the downstream end of the most downstream one of the membrane elements 1 and the downstream axial end cap of the system housing 10 to even and smooth the flow of water from the product water drainage channel 14. It will be appreciated that the system housing 10 may have only one axial end cap, or no axial end caps.
Compare in not setting up the dense water pipe, directly make dense water flow from the global of membrane element, the design of dense water pipe 3 in this application makes dense water and produces the flow path difference of water clearly, is favorable to the membrane element to constitute the corresponding of each pipeline behind the membrane module and the collection of dense water, is convenient for assemble and drainage.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (22)
1. A membrane element for filtering raw water to produce concentrate and produced water, characterized in that the membrane element (1) comprises:
the device comprises a raw water pipe (2), wherein an exchange channel is arranged on the peripheral surface of the raw water pipe (2);
the device comprises a concentrated water pipe (3), wherein an exchange channel is arranged on the peripheral surface of the concentrated water pipe (3); and
a membrane bag (6) and water production flow channel cloth (7), wherein the water production flow channel cloth (7) is arranged on one side of the membrane bag (6), two ends of the membrane bag (6) are respectively connected with the raw water pipe (2) and the concentrated water pipe (3), the membrane bag (6) and the water production flow channel cloth (7) are at least partially wound on the outer side of the raw water pipe (2),
the membrane bag (6) comprises a membrane sheet (62) for filtration,
the axial one end of the raw water pipe (2) limits a raw water inlet, so that raw water entering the raw water pipe (2) from the raw water inlet can enter the membrane bag (6) from the exchange channel of the raw water pipe (2), part of raw water passes through the membrane (62) to form produced water and enters the produced water flow channel cloth (7), and raw water which cannot pass through the membrane (62) becomes concentrated water and enters the concentrated water pipe (3) from the exchange channel of the concentrated water pipe (3).
2. A membrane element as claimed in claim 1, characterized in that the membrane bag (6) comprises a network of inlet channels (61) and membrane sheets (62) arranged on both sides of the network of inlet channels (61), the membrane sheets (62) sealing the network of inlet channels (61) in the membrane sheets (62).
3. A membrane element according to claim 2, characterized in that the inlet flow network (61) is wound at both ends around the raw water pipe (2) and the concentrate pipe (3), respectively.
4. A membrane element as claimed in claim 2, characterized in that the inlet flow network (61) is wound around the raw water pipe (2) at one circumferential end, and that the membrane sheet (62) is not present between the inlet flow network (61) and the raw water pipe (2) at least in some areas in the circumferential direction of the raw water pipe (2).
5. A membrane element according to claim 2, characterized in that the circumferential other end of the inlet flow network (61) is wound around the concentrate pipe (3), at least in a partial region in the circumferential direction of the concentrate pipe (3), without the membrane sheet (62) between the inlet flow network (61) and the concentrate pipe (3).
6. A membrane element as claimed in claim 1, characterized in that the concentrate flows out of the membrane element (1) from the concentrate pipe (3), and the produced water flows out of the membrane element (1) from the produced water channel cloth (7) in the axial direction of the membrane element (1).
7. A membrane element according to claim 1, characterized in that the exchange channels of the raw water pipes (2) are evenly arranged to the raw water pipes (2) and the exchange channels of the concentrate pipes (3) are evenly arranged to the concentrate pipes (3).
8. Membrane element according to claim 1, characterized in that the exchange channels on the raw water pipe (2) and/or the concentrate pipe (3) comprise:
one or more through slots (4); and/or
One or more rows of through holes (5).
9. A membrane element as claimed in claim 1, characterized in that the raw water tube (2) is located on the axis of the membrane element (1).
10. A membrane element as claimed in claim 1, characterized in that the membrane element (1) further comprises a membrane element housing (8) and an end cap (9), the membrane element housing (8) being located at the outermost side of the membrane element (1), the end cap (9) being provided at one or both ends of the membrane element housing (8).
11. A method of producing a membrane element, comprising:
providing a raw water pipe (2) with an exchange channel on the peripheral surface, a concentrated water pipe (3) with an exchange channel on the peripheral surface, a membrane (62) and a water inlet flow passage network (61);
sealing the water inlet runner net (61) between two layers of the membrane (62) to form a membrane bag (6);
winding the membrane bag (6) at least partially on the outer side of the raw water pipe (2), winding one circumferential end of the water inlet runner net (61) on the raw water pipe (2), and not arranging the membrane sheet (62) between the water inlet runner net (61) and the raw water pipe (2) in at least partial region of the raw water pipe (2) in the circumferential direction; and
partially winding the membrane bag (6) outside the concentrate pipe (3) such that the circumferential other end of the intake runner network (61) is wound around the concentrate pipe (3), at least in a partial region in the circumferential direction of the concentrate pipe (3), without the membrane sheet (62) between the intake runner network (61) and the concentrate pipe (3).
12. A production method of a membrane element according to claim 11,
the water inlet channel net (61) is longer than the membrane sheet (62) inside the water inlet channel net (61) by one circumference or more of the raw water pipe (2) at the circumferential end of the membrane bag (6) wound outside the raw water pipe (2), and/or
The winding of membrane bag (6) in the outside of former water pipe (2) circumference one end, inhalant canal net (61) outside diaphragm (62) than inhalant canal net (61) is long or with inhalant canal net (61) flushes.
13. A method for producing a membrane element according to claim 11,
at the other circumferential end of the membrane bag (6) wound around the outside of the concentrate pipe (3), the inlet runner net (61) is longer than the membrane sheet (62) inside the inlet runner net (61) by one circumferential length of the concentrate pipe (3) or more, and/or
The coiling of membrane bag (6) in the outside of concentrate pipe (3) the circumference other end, inhalant canal net (61) the outside diaphragm (62) than inhalant canal net (61) is long or with inhalant canal net (61) flushes.
14. A production method of a membrane element according to claim 11, characterized in that the production method includes:
providing two membranes (62), and fixedly connecting two side edges of the water inlet runner network (61) which are positioned at two axial ends of the raw water pipe (2) to two side edges of the two membranes (62) which are positioned at two axial ends of the raw water pipe (2); and
four sides of the two membranes (62) are correspondingly connected, so that the water inlet flow channel net (61) is sealed in the two membranes (62).
15. A production method of a membrane element according to claim 14, characterized in that the production method includes:
before the membrane bag (6) is wound on the raw water pipe (2) or the concentrated water pipe (3), two side edges of the water inlet runner net (61) which are positioned at two axial ends of the raw water pipe (2) are connected with two side edges of the two membranes (62) which are positioned at two axial ends of the raw water pipe (2) in a sealing way through gluing or ultrasonic welding.
16. A production method of a membrane element according to claim 11, characterized in that the production method includes:
providing a single membrane (62), folding the membrane (62) in half, clamping the water inlet runner network (61) between two layers of membranes (62), and fixedly connecting two side edges of the water inlet runner network (61) which are positioned at two axial ends of the raw water pipe (2) to two side edges of the membrane (62) which are positioned at two axial ends of the raw water pipe (2); and
and correspondingly connecting the rest edges of the single membrane (62) so that the water inlet flow channel net (61) is sealed in the single membrane (62).
17. A production method of a membrane element according to any one of claims 11 to 16, characterized in that the membrane element is the membrane element according to any one of claims 1 to 10.
18. A rolled membrane module, comprising:
a plurality of membrane elements according to any one of claims 1-10; and
a system housing (10), the interior of the system housing (10) being provided with a plurality of the membrane elements (1) axially connected.
19. The rolled membrane module according to claim 18, characterized in that a sealing ring (11) is arranged between the membrane element (1) and the system housing (10).
20. The membrane module of claim 18 or 19, further comprising:
one or more raw water diversion channels (12) connecting one of the raw water diversion channels (12) at an upstream end of the raw water pipe (2) of one of the membrane elements (1) at the most upstream in a direction in which water flows in the axial direction of the wound membrane module, and/or connecting adjacent ends of the adjacent raw water pipes (2) with the one or more raw water diversion channels (12);
one or more concentrate drainage channels (13) connecting adjacent ends of the adjacent concentrate pipes (3) with the one or more concentrate drainage channels (13) in the direction of the axial flow of water along the wound membrane module, and/or connecting one of the concentrate drainage channels (13) at the downstream end of the concentrate pipe (3) of the most downstream one of the membrane elements (1).
21. The membrane module of claim 18 or 19, further comprising:
a water production diversion channel (14) connected to a downstream end of the system housing (10).
22. The membrane module of claim 21, wherein,
the system housing (10) comprises an intermediate cylindrical housing and a downstream axial end cap leaving a water storage space between the downstream end of the most downstream one of the membrane elements (1) and the downstream axial end cap, the water production drainage channel (14) being connected to and communicating with the water storage space.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715626.5A CN115253692B (en) | 2022-06-22 | 2022-06-22 | Membrane element, production method of membrane element and rolled membrane assembly |
| PCT/CN2022/132778 WO2023245975A1 (en) | 2022-06-22 | 2022-11-18 | Membrane element, method for producing membrane element, and roll-type membrane assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715626.5A CN115253692B (en) | 2022-06-22 | 2022-06-22 | Membrane element, production method of membrane element and rolled membrane assembly |
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| CN115253692A true CN115253692A (en) | 2022-11-01 |
| CN115253692B CN115253692B (en) | 2023-12-01 |
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| CN202210715626.5A Active CN115253692B (en) | 2022-06-22 | 2022-06-22 | Membrane element, production method of membrane element and rolled membrane assembly |
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| CN (1) | CN115253692B (en) |
| WO (1) | WO2023245975A1 (en) |
Cited By (1)
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| WO2023245975A1 (en) * | 2022-06-22 | 2023-12-28 | 沃顿科技股份有限公司 | Membrane element, method for producing membrane element, and roll-type membrane assembly |
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| WO2023245975A1 (en) | 2023-12-28 |
| CN115253692B (en) | 2023-12-01 |
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