CN115414792A - Hollow black crystal fiber membrane filtering component and filtering method - Google Patents
Hollow black crystal fiber membrane filtering component and filtering method Download PDFInfo
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- CN115414792A CN115414792A CN202211216659.1A CN202211216659A CN115414792A CN 115414792 A CN115414792 A CN 115414792A CN 202211216659 A CN202211216659 A CN 202211216659A CN 115414792 A CN115414792 A CN 115414792A
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- 239000012528 membrane Substances 0.000 title claims abstract description 146
- 238000001914 filtration Methods 0.000 title claims abstract description 56
- 239000000835 fiber Substances 0.000 title claims abstract description 22
- 239000011011 black crystal Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012510 hollow fiber Substances 0.000 claims abstract description 107
- 238000004140 cleaning Methods 0.000 claims abstract description 45
- 239000011148 porous material Substances 0.000 claims abstract description 29
- 239000011550 stock solution Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims description 27
- 239000000243 solution Substances 0.000 claims description 25
- 239000000706 filtrate Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 108090000862 Ion Channels Proteins 0.000 claims description 16
- 102000004310 Ion Channels Human genes 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000005374 membrane filtration Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000011001 backwashing Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000012466 permeate Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004382 potting Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 108091006146 Channels Proteins 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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- 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
- B01D69/08—Hollow fibre membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/58—Multistep processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of hollow fiber membranes, in particular to a hollow black crystal fiber membrane filtering component and a filtering method, and the hollow black crystal fiber membrane filtering component comprises a shell, a primary filter element, a secondary filter element and an end cover, wherein the primary filter element is set as an internal pressure membrane, the secondary filter element is set as an external pressure membrane, the aperture range of a second hollow fiber membrane is set to be 0.1-1 mu m, and the aperture of a first hollow fiber membrane is 1.1-2 times that of the second hollow fiber membrane; according to the invention, through setting the combination of the filter elements with two sizes and pores, the stock solution is secondarily filtered, so that the pretreatment filter elements are relatively high-frequency cleaned and replaced at low cost, the relatively long cleaning period and the relatively long service life of the main filter element are obtained, the cleaning periods of the pretreatment filter elements are staggered, the other pretreatment filter elements can be cleaned under the condition of keeping the working state of part of the pretreatment filter elements, and the main filter element is ensured to be always in the working state.
Description
Technical Field
The invention relates to the technical field of hollow fiber membranes, in particular to a hollow black crystal fiber membrane filtering component and a filtering method.
Background
The hollow fiber membrane is a membrane with a self-supporting function and a fibrous appearance, is a fiber filament with a hollow inner cavity processed by polysulfone and dimethylacetamide as raw materials, and has a selective permeation characteristic by being divided by a high-permeability polymer, and is one of asymmetric membranes, wherein a dense layer of the hollow fiber membrane can be positioned on the outer surface of the fiber (such as a reverse osmosis membrane) or positioned on the inner surface of the fiber (such as a microfiltration membrane, a nanofiltration membrane and an ultrafiltration membrane). Among them, the separation effect of the membrane is determined by the physical structure of the membrane, the shape and size of pores, and the specifications of microporous membranes are over ten at present, the pore diameter ranges from 0.1 to 75 μm, and the membrane thickness ranges from 120 to 150 μm.
The aperture of the hollow fiber ultrafiltration membrane is 0.1 micron, if the water quality of inlet water cannot meet the use requirement, the aperture is easy to cause the phenomena of pollution and blockage, the requirement on pretreatment is higher, the cleaning is frequent in the use process, and the service life of the hollow fiber membrane can be influenced by frequent cleaning, long-term pollution and blockage.
At present, the ends of the hollow fiber membranes are usually fixed on a plurality of groups of plates made of epoxy resin directly, and cannot be removed and replaced, and the damage of the local membranes can cause the overall replacement.
Disclosure of Invention
According to a first aspect of the object of the present invention, there is provided a hollow fiber membrane filtration module comprising:
the guide plate is fixedly arranged inside the hollow cylinder, a second filter cavity is formed on the inner side of the guide plate, a first filter cavity with a certain width is formed between the outer wall of the guide plate and the inner wall of the outer shell, and a guide hole for communicating the first filter cavity with the second filter cavity is formed in the guide plate;
the primary filter element is arranged in the first filter cavity and comprises a plurality of groups of first hollow fiber membranes which are distributed in parallel along the axis of the outer shell and first packaging plates which are fixed at two ends of the first hollow fiber membranes;
the second filter element is arranged in the second filter cavity and comprises a plurality of groups of second hollow fiber membranes which are distributed in parallel along the axis of the outer shell and second packaging plates which are fixed at two ends of the second hollow fiber membranes;
the second end cover is arranged to cover the top of the guide plate and used for sealing the second filter cavity, and a filtered clear liquid discharge pipe communicated with the second filter cavity is arranged on the second end cover;
the first end cover is arranged and covered on the top of the outer shell and used for sealing the first filtering cavity, and a stock solution inlet pipe communicated with the first filtering cavity is arranged on the first end cover;
the outer wall of the shell is fixedly provided with a first concentrated solution discharge pipe communicated with the first filter cavity, the first hollow fiber membrane is set as an internal pressure membrane, and a first membrane channel which is communicated with the stock solution inlet pipe and the first concentrated solution discharge pipe up and down is arranged in the first hollow fiber membrane;
a second concentrated liquid discharge pipe communicated with the second filter cavity is fixedly arranged on the outer wall of the outer shell, the second hollow fiber membrane is set to be an external pressure membrane, and a second membrane channel communicated with the filtered liquid discharge pipe is arranged inside the second hollow fiber membrane;
and a pressure supply connection pipe communicated with the first filter cavity and the second filter cavity is fixedly arranged on the outer side wall of the outer shell, and the pressure supply connection pipe is connected with an external pressurizing device, so that the pressure difference between the inside and the outside of the second hollow fiber membrane is kept at 0.1-0.3 MPa.
Wherein the pore diameter of the second hollow fiber membrane is smaller than the pore diameter of the first hollow fiber membrane.
As an alternative embodiment, the pore diameter range of the second hollow fiber membrane is set to 0.1 to 1 μm, and the pore diameter of the first hollow fiber membrane is 1.1 to 2 times the pore diameter of the second hollow fiber membrane.
As an alternative embodiment, a plurality of the primary filter elements are uniformly distributed on the peripheral side of the secondary filter element.
As an optional embodiment, a plurality of partition plates are fixedly arranged in the first filtering cavity, and two side edges of each partition plate are respectively fixed on the inner wall of the outer shell and the outer wall of the guide plate, so that the first filtering cavity is uniformly partitioned into independent spaces.
As an alternative embodiment, the sectional area of the flow guide hole communicating with each independent space and the second filter cavity is the same, and the plurality of flow guide holes are uniformly distributed on the flow guide plate.
As an alternative embodiment, the outer housing is provided as a hollow cylinder having a circular, rectangular or regular polygonal cross-section.
As an alternative embodiment, the outer housing comprises a plastic or stainless steel housing.
As an alternative embodiment, the raw liquid inlet pipe includes a first inlet pipe and a second inlet pipe, and the first inlet pipe and the second inlet pipe are arranged on the first end cover from inside to outside along the radial direction of the first end cover.
As optional embodiment, first water conservancy diversion annular and second water conservancy diversion annular have been seted up to the inside of first end cover, first water conservancy diversion annular and second water conservancy diversion annular are separated each other, just first water conservancy diversion annular with first admission pipe intercommunication, second water conservancy diversion annular with the second admission pipe intercommunication.
As an optional embodiment, the top surface of the first package plate is provided with a diffusion groove communicated with the plurality of first film channels, and the joint surface of the first end cover and the diffusion groove is respectively provided with a first through groove communicated with the first diversion ring groove and a second through groove communicated with the second diversion ring groove.
As an optional embodiment, the first through grooves and the second through grooves are sequentially and alternately distributed in the circumferential direction, and the first through grooves and the second through grooves correspond to one of the independent spaces respectively.
According to a second aspect of the object of the present invention, there is provided a filtration method of a hollow fiber membrane, comprising the steps of:
and step 3, filtering: the stock solution enters the first-stage filter element from the stock solution inlet pipe, circulates in the first membrane channel and permeates into the first filter cavity from micropores on the surface wall of the first hollow fiber membrane to complete primary filtration, primary filtrate passes through the flow guide holes to reach the second filter cavity and passes through the second hollow fiber membrane under the action of pressure to enter the second membrane channel to complete secondary filtration to obtain filtrate, and the filtrate is discharged and collected from a filtrate discharge pipe;
the first end cover is internally provided with a first guide ring groove and a second guide ring groove which are mutually separated and respectively communicated with the first inlet pipe and the second inlet pipe, the top surface of the first packaging plate is provided with a plurality of diffusion grooves communicated with the first membrane channels, the joint surface of the first end cover and the diffusion grooves is respectively provided with a first through groove communicated with the first guide ring groove and a second through groove communicated with the second guide ring groove, the first through groove and the second through groove are sequentially and alternately distributed in the circumferential direction, and the first through groove and the second through groove respectively correspond to one independent space;
the definition the clearance cycle of one-level filter core is T, two sets of one-level filter core respectively with first admission pipe and second admission pipe intercommunication, and two sets of dislocation T2 on the clearance time of one-level filter core makes during the clearance of one-level filter core, the filtration does not stop to the second grade filter core.
Compared with the prior art, the hollow black crystal fiber membrane filtering component provided by the invention has the advantages that through the combination of the filter elements with two sizes of pores, the main filter element adopts small pores and has larger volume, the pretreatment filter element adopts slightly larger pores and smaller volume compared with the main filter element, and the primary liquid is filtered for the second time, so that the pretreatment filter element is cleaned at relatively high frequency and replaced at low cost, and the relatively long cleaning period and the relatively long service life of the main filter element are replaced; meanwhile, the cleaning periods of the pretreatment filter elements are staggered, so that the pretreatment filter elements of the rest parts can be cleaned under the condition that the working state of part of the pretreatment filter elements is maintained, and the main filter element is ensured to be always in the working state.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view showing the internal structure of a hollow fiber membrane filtration module according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic perspective view of a hollow fiber membrane filtration module according to an embodiment of the present invention;
FIG. 4 is a schematic bottom view of a hollow fiber membrane filtration module according to an embodiment of the present invention, wherein two sets of inlet tubes are disposed at a first end cap;
fig. 5 is a schematic cross-sectional view of a hollow fiber membrane filtration module according to an embodiment of the present invention, in which two sets of inlet tubes are disposed at a first end cap.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
At present, a hollow fiber membrane component is applied to the fields of water treatment, beverages, chemical industry, medicines and the like, a membrane separation technology is utilized to separate, concentrate and purify solution or gas substances, micropores of a membrane wall are densely distributed, a stock solution passes through one side of the membrane under certain pressure, a solvent and a small molecular solute permeate through the membrane wall to be filtrate, a large molecular solute is intercepted by a membrane, but after a certain period (usually 1-3 months according to different raw water) is used, dirt attached to the surface of the membrane needs to be cleaned, the cleaning usually adopts a physical mode (water-gas mixed cleaning, pure water flushing, negative pressure reverse flushing and the like) or a chemical cleaning mode (an acid cleaning method, an alkali cleaning method, an oxidative cleaning agent cleaning method, an enzyme cleaning agent cleaning method and the like), and the cleaning period is short at present and the condition that the membrane is easily damaged due to cleaning is aimed at prolonging the cleaning period and the service life of the hollow fiber membrane component.
[ hollow fiber Membrane filtration Module ]
With reference to the example shown in fig. 1, the hollow fiber membrane filter assembly according to the first aspect of the present invention includes an outer housing 1, a primary filter element 2, a secondary filter element 3, a first end cap 4, and a second end cap 5.
Different fiber membrane pore diameters are sampled in the primary filter element 2 and the secondary filter element 3, so that the primary filter element adopts small-size pores and has larger volume, the pretreatment filter element adopts slightly larger pores and has smaller volume compared with the primary filter element by setting the combination of two sizes of pore filter elements, and the stock solution is subjected to secondary filtration to realize high-frequency cleaning and low-cost replacement relative to the pretreatment filter element, so that the relatively long cleaning period and the relatively long service life of the primary filter element are replaced; meanwhile, the cleaning periods of the pretreatment filter elements are staggered, so that the other pretreatment filter elements can be cleaned under the condition that the working state of part of the pretreatment filter elements is kept, and the main filter element is ensured to be in the working state all the time.
The construction and use of the elements of the foregoing embodiments are now more fully described with reference to the accompanying drawings.
Outer casing
Wherein, the outer shell 1 is a hollow cylinder with an open upper end, and a guide plate 11 is fixedly arranged inside.
For example, the outer casing 1 is made of corrosion-resistant plastic or stainless steel, and the plastic casing has a compressive strength of 0.3MPa or less.
Further, a second filtering cavity 102 is formed on the inner side of the flow guide plate 11, and a first filtering cavity 101 with a certain width is formed between the outer wall of the flow guide plate 11 and the inner wall of the outer shell 1.
The guide plate 11 is provided with a guide hole 111 for communicating the first filter cavity 101 and the second filter cavity 102.
As an alternative example, the outer casing 1 is provided as a hollow cylinder having a circular, rectangular, or regular polygonal cross-section.
For example, the cross section of the outer shell 1 is circular, the baffle 11 and the side wall of the outer shell 1 are concentrically distributed, and the uniform ring part of the first filter cavity 101 is arranged on the outer periphery side of the second filter cavity 102.
The bottom of the first filter chamber 101 has a first cartridge mounting slot 14 for receiving and mounting the first stage cartridge 2, and the bottom of the second filter chamber 102 has a second cartridge mounting slot 15 for receiving and mounting the second stage cartridge 3 to facilitate accurate cartridge installation.
Filter element
In combination, the filter cartridge comprises a primary filter cartridge 2 disposed in a first filter chamber 101 and a secondary filter cartridge 3 disposed in a second filter chamber 102.
The primary filter element 2 comprises a plurality of groups of first hollow fiber membranes 21 distributed in parallel along the axis of the outer shell 1 and first packaging plates 22 fixed at two ends of the first hollow fiber membranes 21.
The secondary filter element 3 comprises a plurality of groups of second hollow fiber membranes 31 distributed in parallel along the axis of the outer shell 1 and second packaging plates 32 fixed at two ends of the second hollow fiber membranes 31.
As an alternative example, the first hollow fiber membranes 21 employ an internal pressure membrane, and the second hollow fiber membranes 31 employ an external pressure membrane.
First and second potting plates 22, 32 are each formed using epoxy potting at the ends of the hollow fiber membranes.
Both ends of the first hollow fiber membrane 21 penetrate the first package plate 22.
One end of the second hollow fiber membrane 31 is potted by the second potting plate 32, and the other end penetrates the second potting plate 32 to discharge the filtrate.
In a preferred embodiment, the first hollow fiber membrane 21 and the second hollow fiber membrane 31 both use a black crystal separation membrane, that is, a hollow fiber membrane made of a casting solution doped with graphene.
The pore diameter of the second hollow fiber membrane 31 is smaller than the pore diameter of the first hollow fiber membrane 21, so that the first hollow fiber membrane 21 can filter out relatively large suspended matters in the original solution in advance, so as to reduce the adhesion amount of the suspended matters on the second hollow fiber membrane 31.
As an alternative example, the pore diameter of the second hollow fiber membrane 31 is set to be in the range of 0.1 to 1 μm, and the pore diameter of the first hollow fiber membrane 21 is 1.1 to 2 times the pore diameter of the second hollow fiber membrane 31.
For example, when the pore diameter of the second hollow fiber membrane 31 is 0.1 μm, the pore diameter of the first hollow fiber membrane 21 is selected to be in the range of 0.11 to 0.2 μm, and most of the suspended matter that can be attached to the second hollow fiber membrane 31 can be filtered out in advance, thereby extending the cleaning cycle of the second hollow fiber membrane 31.
As an alternative embodiment, the filter element includes a plurality of primary filter elements 2, and the plurality of primary filter elements 2 are uniformly distributed on the peripheral side of the secondary filter element 3.
So, the volume of one-level filter core 2 is littleer relatively, and the quantity of first hollow fiber membrane 21 also can reduce, and after the first hollow fiber membrane 21 of wherein part damages, then can be with having the whole change of one-level filter core 2 that damages, save the replacement cost that brings because of the hollow fiber membrane damages.
Further, as shown in fig. 2, in order to separate each of the first-stage filter elements 2 from each other, a plurality of partition plates 16 are fixedly arranged in the first filter cavity 101, two side edges of each partition plate 16 are respectively fixed to the inner wall of the outer shell 1 and the outer wall of the guide plate 11, the first filter cavity 101 is uniformly separated into independent spaces, so that the first-stage filtrate filtered by each of the first-stage filter elements 2 can be collected to the second-stage filter element 3 from the periphery of the second-stage filter element 3, the phenomenon that the dirt is attached to one side of the second-stage filter element 3 is avoided, the surface of the second-stage filter element 3 is not uniformly pressed, and the cleaning period of the second-stage filter element 3 is further delayed.
In the illustrated embodiment, six independent spaces are divided as an example.
In order to further reduce the replacement cost of a single stage filter element 2, a larger number of independent spaces can be separated in practical application.
Specifically, the cross-sectional area of each independent space is the same as that of the flow guide holes 111 communicated with the second filter cavity 102, the flow guide holes 111 are arranged in a plurality and are uniformly distributed on the flow guide plate 11, and the flow guide holes 111 are arranged in rectangular, circular or polygonal holes and can play a role in uniform flow guide, so that the primary filtrate in the independent space is guided into the second filter cavity 102.
Combine above embodiment, through the filter core that sets up two kinds of size holes, wherein main filter core adopts the small-size hole, and the great filter core of volume, peripheral preliminary treatment filter core adopts the hole of relatively great size, and the less combination formula filter core of volume, at first carry out prefiltering to the stoste by peripheral a plurality of independent one-level filter cores 2 during filtration, the one-level drainage after the prefiltering reachs second grade filter core 3 again and carries out secondary filter, reach second grade filterable purpose according to this, and with the relative frequent clearance of peripheral one-level filter core 2, low-cost change, trade the relatively long clearance cycle of second grade filter core 3 and relatively long life.
End cap
In the example shown, the second end cap 5 is arranged to cover the top of the baffle 11 and is mounted in a screw-on manner to the inner wall of the baffle 11.
A sealing ring 401 is arranged at the joint of the second end cap 5 and the guide plate 11 for sealing the second filter chamber 102.
A clear filtrate discharge pipe 51 penetrating the second filter chamber 102 is provided at a middle position of the upper end surface of the second end cap 5, and a confluence chamber 501 capable of covering all the second hollow fiber membranes 31 is provided at the lower end surface of the second end cap 5, so that the clear filtrate filtered in the second hollow fiber membranes 31 can be collected at the confluence chamber 501 and discharged from the clear filtrate discharge pipe 51.
In the example shown in the figure, the first end cap 4 is arranged to cover the top of the outer casing 1 and is mounted on the inner wall of the outer casing 1 in a threaded manner, and sealing rings 401 are mounted on the abutting surfaces of the first end cap 4, the outer casing 1 and the flow guide plate 11 and used for sealing the first filter cavity 101.
Example 1
As shown in fig. 1 and 2, the first end cap 4 is provided with a raw liquid inlet pipe 41 penetrating the first filter chamber 101, and the raw liquid inlet pipe 41 can communicate with each of the independent spaces so that the raw liquid introduced from the raw liquid inlet pipe 41 can be guided into each of the independent spaces.
Specifically, a first concentrated solution discharge pipe 13 communicated with the first filter chamber 101 is fixedly arranged on the outer wall of the outer shell 1, and a first membrane channel 211 communicated with the stock solution inlet pipe 41 and the first concentrated solution discharge pipe 13 up and down is arranged in the first hollow fiber membrane 21;
a second concentrated solution discharge pipe 12 communicated with the second filter cavity 102 is fixedly arranged on the outer wall of the outer shell 1, and a second membrane channel 311 communicated with the filtered solution discharge pipe 51 is arranged inside the second hollow fiber membrane 31;
and a pressure supply connection pipe 17 communicated with the first filter cavity 101 and the second filter cavity 102 is fixedly arranged on the outer side wall of the outer shell 1, and the pressure supply connection pipe 17 is connected with external pressurizing equipment, so that the pressure difference between the inside and the outside of the second hollow fiber membrane 31 is kept at 0.1-0.3 MPa.
In this way, the unfiltered raw liquid is introduced into the primary filter element 2 through the raw liquid inlet pipe 41, the primary filtrate filtered by the primary filter element 2 passes through the gap of the first hollow fiber membrane 21 and reaches the first filter chamber 101, flows into the second hollow fiber membrane 31 having a lower pressure under the pressure of the pressure device connected to the pressure connection pipe 17, and is filtered by the second hollow fiber membrane 31 to reach the second membrane passage 311 to form a filtrate, and is finally discharged from the filtrate discharge pipe 51.
Wherein, the concentrated solution produced in the primary filtration process and the suspension cleaned by the primary filter element 2 are discharged from the first concentrated solution discharge pipe 13 at the bottom end of the first filter cavity 101, and the concentrated solution produced in the secondary filtration process and the suspension cleaned by the secondary filter element 3 are discharged from the second concentrated solution discharge pipe 12 at the bottom end of the second filter cavity 102.
Example 2
As shown in fig. 4 and 5, unlike embodiment 1, the raw liquid inlet pipe 41 includes a first inlet pipe 411 and a second inlet pipe 412, and the first inlet pipe 411 and the second inlet pipe 412 are provided on the first end cap 4 from the inside to the outside in the radial direction of the first end cap 4.
Further, in order to enable the first inlet pipe 411 and the second inlet pipe 412 to be provided with independent flow guide ring grooves respectively, a first flow guide ring groove 42 and a second flow guide ring groove 43 are formed in the first end cover 4, the first flow guide ring groove 42 and the second flow guide ring groove 43 are separated from each other, the first flow guide ring groove 42 is communicated with the first inlet pipe 411, and the second flow guide ring groove 43 is communicated with the second inlet pipe 412.
In order to enable the stock solution introduced from the first inlet pipe 411 and the second inlet pipe 412 to enter different independent spaces, the top surface of the first packaging plate 22 is provided with a diffusion groove 221 communicated with the plurality of first film channels 211, the joint surface of the first end cover 4 and the diffusion groove 221 is respectively provided with a first through groove 421 communicated with the first diversion ring groove 42 and a second through groove 431 communicated with the second diversion ring groove 43, the first through groove 421 and the second through groove 431 are sequentially and alternately distributed in the circumferential direction, and the first through groove 421 and the second through groove 431 respectively correspond to one independent space.
So, can utilize two valves independent control respectively to get into the stoste of first admission pipe 411 and second admission pipe 412 to according to the clearance cycle of one-level filter core 2, make the clearance cycle of two sets of one-level filter cores 2 of being connected with first admission pipe 411 and second admission pipe 412 crisscross, make under one set of one-level filter core 2 clearance state, another group one-level filter core 2 still keeps working, realize the clearance to one-level filter core 2 under second grade filter core 3 operating condition according to this.
In practical application, stoste admission pipe 41 can also set up more than two, and corresponding one-level filter core 2 sets up more than two sets of, and stoste admission pipe 41 corresponds with the group number of one-level filter core 2, appears damaged back when one-level filter core 2, can open a set of one-level filter core 2 wherein in proper order, finds out damaged one-level filter core 2's position fast, changes.
[ filtration method of hollow fiber Membrane ]
The method for filtering raw water by combining the hollow fiber membrane filtering component comprises the following steps:
And step 3, filtering: the stock solution enters the first-stage filter element 2 through the stock solution inlet pipe 41, circulates in the first membrane channel 211, permeates into the first filter cavity 101 from micropores on the surface wall of the first hollow fiber membrane 21, completes primary filtration, primary filtrate passes through the flow guide holes 111 to reach the second filter cavity 102 and passes through the second hollow fiber membrane 31 under the action of pressure to enter the second membrane channel 311, secondary filtration is completed to obtain filtrate, and the filtrate is discharged and collected from the filtrate discharge pipe 51.
Further, a plurality of independent spaces can be uniformly separated by the partition plates 16 in the first filtering cavity 101, the raw liquid inlet pipe 41 comprises a first inlet pipe 411 and a second inlet pipe 412, a first flow guide ring groove 42 and a second flow guide ring groove 43 which are separated from each other and respectively communicated with the first inlet pipe 411 and the second inlet pipe 412 are arranged in the first end cover 4, and the top surface of the first packaging plate 22 is provided with a diffusion groove 221 communicated with the plurality of first membrane channels 211.
Correspondingly, the first through groove 421 communicated with the first diversion ring groove 42 and the second through groove 431 communicated with the second diversion ring groove 43 are respectively formed in the binding surfaces of the first end cover 4 and the diffusion groove 221, the first through groove 421 and the second through groove 431 are sequentially and alternately distributed in the circumferential direction, and the first through groove 421 and the second through groove 431 respectively correspond to an independent space.
The clearance cycle of definition one-level filter core 2 is T, and two sets of one-level filter core 2 communicate with first admission pipe 411 and second admission pipe 412 respectively, and dislocation T2 on two sets of one-level filter core 2's the clearance time, and when making the clearance of one-level filter core 2, second grade filter core 3 does not stop filtering, makes the filtering process continuous, does not receive the influence of one-level filter core 2 clearance.
Combine above embodiment, through the combination that sets up two kinds of size pore filter cores, make wherein main filter core adopt small-size pore and bulky, the preliminary treatment filter core adopts the slightly big pore of main filter core and the volume is less relatively, carry out the secondary filtration to the stoste, and with the relative high frequency clearance of preliminary treatment filter core, low-cost change, the relatively long clearance cycle and the relatively long life of main filter core are traded, stagger the clearance cycle of preliminary treatment filter core simultaneously, can keep under partial preliminary treatment filter core operating condition, wash the preliminary treatment filter core of other parts, and guarantee that main filter core is in operating condition all the time.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (12)
1. A hollow black crystal fiber membrane filtration module, comprising:
the filter device comprises an outer shell (1) which is a hollow cylinder with an open upper end, a guide plate (11) is fixedly arranged in the outer shell, a second filter cavity (102) is formed on the inner side of the guide plate (11), a first filter cavity (101) with a certain width is formed between the outer wall of the guide plate (11) and the inner wall of the outer shell (1), and a guide hole (111) for communicating the first filter cavity (101) with the second filter cavity (102) is formed in the guide plate (11);
the primary filter element (2) is arranged in the first filter cavity (101), and the primary filter element (2) comprises a plurality of groups of first hollow fiber membranes (21) which are distributed in parallel along the axis of the outer shell (1) and first packaging plates (22) which are fixed at two ends of the first hollow fiber membranes (21);
the secondary filter element (3) is arranged in the second filter cavity (102), and the secondary filter element (3) comprises a plurality of groups of second hollow fiber membranes (31) which are distributed in parallel along the axis of the outer shell (1) and second packaging plates (32) which are fixed at two ends of the second hollow fiber membranes (31);
the second end cover (5) is arranged to cover the top of the guide plate (11) and is used for sealing the second filtering cavity (102), and a filtered liquid discharge pipe (51) communicated with the second filtering cavity (102) is arranged on the second end cover (5);
the first end cover (4) is arranged to cover the top of the outer shell (1) and is used for sealing the first filter cavity (101), and a stock solution inlet pipe (41) communicated with the first filter cavity (101) is arranged on the first end cover (4);
wherein, the outer wall of the outer shell (1) is fixedly provided with a first concentrated solution discharge pipe (13) communicated with the first filter cavity (101), the first hollow fiber membrane (21) is set as an internal pressure membrane, and a first membrane channel (211) which is communicated with the stock solution inlet pipe (41) and the first concentrated solution discharge pipe (13) up and down is arranged in the first hollow fiber membrane (21);
a second concentrated solution discharge pipe (12) communicated with the second filtering cavity (102) is fixedly arranged on the outer wall of the outer shell (1), the second hollow fiber membrane (31) is set to be an external pressure membrane, and a second membrane channel (311) communicated with the filtered solution discharge pipe (51) is arranged inside the second hollow fiber membrane (31);
the pore diameter of the second hollow fiber membrane (31) is smaller than that of the first hollow fiber membrane (21);
and a pressure supply connection pipe (17) communicated with the first filter cavity (101) and the second filter cavity (102) is fixedly arranged on the outer side wall of the outer shell (1), and the pressure supply connection pipe (17) is connected with external pressurizing equipment, so that the pressure difference between the inside and the outside of the second hollow fiber membrane (31) is kept between 0.1 and 0.3MPa.
2. The hollow black crystal fiber membrane filter assembly according to claim 1, wherein a plurality of primary filter elements (2) are uniformly distributed on the peripheral side of the secondary filter element (3).
3. The hollow black crystal fiber membrane filter assembly of claim 2, wherein a plurality of partition plates (16) are fixedly arranged in the first filter chamber (101), and two side edges of each partition plate (16) are respectively fixed on the inner wall of the outer shell (1) and the outer wall of the guide plate (11) to uniformly partition the first filter chamber (101) into independent spaces.
4. The hollow black crystal fiber membrane filter assembly of claim 3, wherein the cross-sectional area of the flow guide hole (111) communicating with the second filter chamber (102) in each independent space is the same, and a plurality of flow guide holes (111) are uniformly distributed on the flow guide plate (11).
5. The hollow black crystal fiber membrane filter module according to any one of claims 1 to 4, wherein the outer housing (1) is provided as a hollow cylinder having a circular, rectangular or regular polygonal cross-section.
6. The hollow black crystal fiber membrane filter module according to claim 5, wherein the outer housing (1) is a plastic or stainless steel housing.
7. The hollow black crystal fiber membrane filter module according to claim 3, wherein the raw liquid inlet pipe (41) comprises a first inlet pipe (411) and a second inlet pipe (412), and the first inlet pipe (411) and the second inlet pipe (412) are arranged on the first end cover (4) from inside to outside along the radial direction of the first end cover (4).
8. The hollow black crystal fiber membrane filter assembly according to claim 7, wherein the first end cap (4) has a first flow guide ring groove (42) and a second flow guide ring groove (43) formed therein, the first flow guide ring groove (42) and the second flow guide ring groove (43) are separated from each other, the first flow guide ring groove (42) is communicated with the first inlet pipe (411), and the second flow guide ring groove (43) is communicated with the second inlet pipe (412).
9. The hollow black crystal fiber membrane filter assembly of claim 8, wherein the top surface of the first packaging plate (22) is provided with a diffusion groove (221) communicated with the plurality of first membrane channels (211), and the abutting surfaces of the first end cover (4) and the diffusion groove (221) are respectively provided with a first through groove (421) communicated with the first flow guide ring groove (42) and a second through groove (431) communicated with the second flow guide ring groove (43).
10. The hollow black crystal fiber membrane filter assembly according to claim 9, wherein the first through grooves (421) and the second through grooves (431) are sequentially and alternately distributed in the circumferential direction, and the first through grooves (421) and the second through grooves (431) correspond to one independent space respectively.
11. The hollow black crystal fiber membrane filtration module according to claim 1, wherein the pore size of the second hollow fiber membrane (31) is set to be in the range of 0.1 to 1 μm, and the pore size of the first hollow fiber membrane (21) is 1.1 to 2 times the pore size of the second hollow fiber membrane (31).
12. A filtering method based on the hollow black crystal fiber membrane filtering component of any one of claims 1 to 10, characterized by comprising the following steps:
step 1, pre-installation: connecting the stock solution inlet pipe (41) with a stock solution pipe joint, connecting a second concentrated solution discharge pipe (12) and a first concentrated solution discharge pipe (13) with a concentrated solution collecting device through two groups of pipe joints, connecting the pressure supply connection pipe (17) with external pressurization equipment through the pipe joints, and connecting the filtered solution discharge pipe (51) with a purified water collecting device through the pipe joints;
step 2, water introduction and pressurization: defining the working pressure of the first hollow fiber membrane (21) and the working pressure of the second hollow fiber membrane (31) to be 0.2MPa, introducing a stock solution into the stock solution inlet pipe (41), then pressurizing the first hollow fiber membrane (21), the first filter cavity (101) and the second filter cavity (102) through the pressure supply connecting pipe (17), and pressurizing the first hollow fiber membrane (21), the first filter cavity (101) and the second filter cavity (102) sequentially and alternately until the internal-external pressure difference of the first hollow fiber membrane (21) is 0.2MPa, and the internal-external pressure difference of the second hollow fiber membrane (31) is 0.2MPa;
and step 3, filtering: the stock solution enters the first-stage filter element (2) through the stock solution inlet pipe (41), circulates in the first membrane channel (211) and permeates into the first filter cavity (101) from micropores on the surface wall of the first hollow fiber membrane (21) to complete primary filtration, primary filtrate passes through the flow guide holes (111) to reach the second filter cavity (102) and passes through the second hollow fiber membrane (31) under the action of pressure to enter the second membrane channel (311) to complete secondary filtration to obtain filtrate, and the filtrate is discharged and collected from the filtrate discharge pipe (51);
step 4, cleaning: when the primary filter element (2) reaches a cleaning period, cleaning by adopting one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning, discharging concentrated water and dirt in the primary filtering process from a first concentrated liquid discharge pipe (13) at the lower end of a first filter cavity (101), when the secondary filter element (3) reaches the cleaning period, cleaning by adopting one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning, discharging dirt in the secondary filtering process from a second concentrated liquid discharge pipe (12) at the lower end of a second filter cavity (102), and delaying the cleaning period of the secondary filter element (3) in a mode of pre-filtering by the primary filter element (2);
the first filtering cavity (101) can be uniformly divided into a plurality of independent spaces by partition plates (16), the stock solution inlet pipe (41) comprises a first inlet pipe (411) and a second inlet pipe (412), a first flow guide ring groove (42) and a second flow guide ring groove (43) which are mutually separated and respectively communicated with the first inlet pipe (411) and the second inlet pipe (412) are arranged in the first end cover (4), a diffusion groove (221) communicated with the first membrane channels (211) is formed in the top surface of the first packaging plate (22), first through grooves (421) communicated with the first flow guide ring groove (42) and second through grooves (431) communicated with the second flow guide ring groove (43) are respectively formed in the joint surfaces of the first end cover (4) and the diffusion groove (221), the first through grooves (421) and the second through grooves (431) are sequentially and alternately distributed in the circumferential direction, and the first through grooves (421) and the second through grooves (431) respectively correspond to the independent spaces 431;
the definition the clearance cycle of one-level filter core (2) is T, two sets of one-level filter core (2) respectively with first admission pipe (411) and second admission pipe (412) intercommunication, and two sets of dislocation T/2 in the clearance time of one-level filter core (2) makes during the clearance of one-level filter core (2), second grade filter core (3) do not stop filtering.
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| CN115804983A (en) * | 2022-12-23 | 2023-03-17 | 珂睿斯科技(深圳)有限公司 | Self-cleaning continuous water purification filter element and self-cleaning method |
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