CN115414792B - Hollow black crystal fiber membrane filter assembly and filter method - Google Patents
Hollow black crystal fiber membrane filter assembly and filter method Download PDFInfo
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- CN115414792B CN115414792B CN202211216659.1A CN202211216659A CN115414792B CN 115414792 B CN115414792 B CN 115414792B CN 202211216659 A CN202211216659 A CN 202211216659A CN 115414792 B CN115414792 B CN 115414792B
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- 239000012528 membrane Substances 0.000 title claims abstract description 143
- 239000000835 fiber Substances 0.000 title claims abstract description 21
- 239000011011 black crystal Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 17
- 239000012510 hollow fiber Substances 0.000 claims abstract description 106
- 238000004140 cleaning Methods 0.000 claims abstract description 60
- 238000001914 filtration Methods 0.000 claims abstract description 40
- 239000011550 stock solution Substances 0.000 claims abstract description 34
- 239000011148 porous material Substances 0.000 claims abstract description 24
- 238000005374 membrane filtration Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 36
- 108090000862 Ion Channels Proteins 0.000 claims description 17
- 102000004310 Ion Channels Human genes 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 239000000706 filtrate Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 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 9
- 239000000126 substance Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000011001 backwashing Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012466 permeate Substances 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
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000012141 concentrate Substances 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 238000004382 potting Methods 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
- 230000000694 effects 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
- 238000005406 washing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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
- 230000006978 adaptation Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 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
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002255 enzymatic effect Effects 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
- 229920002521 macromolecule Polymers 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
- 230000035699 permeability 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
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 filtration assembly and a filtration method, wherein the hollow black crystal fiber membrane filtration assembly comprises an outer shell, a primary filter element, a secondary filter element and an end cover, the primary filter element is arranged as an inner pressure membrane, the secondary filter element is arranged as an outer 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 of the aperture of the second hollow fiber membrane; according to the invention, through setting the combination of the two size pore filter elements, secondary filtration is carried out on the stock solution, the relative high-frequency cleaning and low-cost replacement of the pretreatment filter elements are carried out, the relative long cleaning period and the relative long service life of the main filter element are replaced, the cleaning periods of a plurality of pretreatment filter elements are staggered, the rest pretreatment filter elements can be cleaned under the working state of the part of pretreatment filter elements, and the main filter elements are 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 filter assembly and a hollow black crystal fiber membrane filter method.
Background
The hollow fiber membrane is a fibrous membrane with self-supporting function, the hollow fiber membrane is a fiber yarn which is processed into a hollow inner cavity by taking polysulfone and dimethylacetamide as raw materials, and the hollow fiber membrane is divided by a high-permeability polymer, has selective permeability characteristics, is an asymmetric membrane, and can be positioned on the outer surface (such as a reverse osmosis membrane) of the fiber or the inner surface (such as a microfiltration membrane, a nanofiltration membrane and an ultrafiltration membrane) of the fiber. Among these, the separation effect of the membrane is determined by the physical structure of the membrane, the shape and size of the pores, the specification of microporous membranes is currently more than ten, the pore diameter ranges from 0.1 to 75 μm, and the film thickness ranges from 120 to 150 μm.
The aperture of the hollow fiber ultrafiltration membrane is 0.1 micron, if the quality of the inflow water can not meet the use requirement, the aperture is easy to generate the phenomena of pollution and blockage, the pretreatment requirement is higher, frequent cleaning is needed in the use process, and the service life of the hollow fiber membrane can be influenced by frequent cleaning and long-term pollution and blockage.
Currently, the ends of hollow fiber membranes are typically groups of plates directly secured to an epoxy resin, and cannot be removed for replacement, and localized membrane damage can result in 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 outer shell is arranged as a hollow cylinder with an open upper end, a guide plate is fixedly arranged in the outer shell, 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 first-stage 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-stage 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 is used for sealing the second filter cavity, and a filtered liquid discharge pipe communicated with the second filter cavity is arranged on the second end cover;
the first end cover is arranged to cover the top of the outer shell and is used for sealing the first filter cavity, and a stock solution inlet pipe communicated with the first filter cavity is arranged on the first end cover;
the outer wall of the outer shell is fixedly provided with a first concentrated solution discharge pipe communicated with the first filter cavity, the first hollow fiber membrane is set to be an internal pressure membrane, and a first membrane channel which is vertically communicated with the raw solution inlet pipe and the first concentrated solution discharge pipe is arranged in the first hollow fiber membrane;
a second concentrated solution drain pipe communicated with the second filter cavity is fixedly arranged on the outer wall of the outer shell, the second hollow fiber membrane is arranged as an external pressure membrane, and a second membrane channel communicated with the filter solution drain pipe is arranged inside the second hollow fiber membrane;
the outer side wall of the outer shell is fixedly provided with a pressure supply pipe communicated with the first filter cavity and the second filter cavity, and the pressure supply pipe is connected with external pressurizing equipment to keep the pressure difference between the inside and the outside of the second hollow fiber membrane at 0.1-0.3 MPa.
Wherein the pore diameter of the second hollow fiber membrane is smaller than that 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 alternative embodiment, a plurality of baffles are fixedly arranged in the first filter cavity, and two side edges of the baffles are respectively fixed on the inner wall of the outer shell and the outer wall of the guide plate, so that the first filter cavity is uniformly separated to form independent spaces.
As an alternative embodiment, the cross-sectional area of the diversion holes communicated with the second filter cavity in each independent space is the same, and the diversion holes are uniformly distributed on the diversion plate.
As an alternative embodiment, the outer housing is provided as a hollow cylinder with a circular, rectangular or regular polygon cross section.
As an alternative embodiment, the outer housing comprises a plastic or stainless steel housing.
As an alternative embodiment, the stock solution inlet pipe comprises 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 an optional embodiment, a first flow guiding ring groove and a second flow guiding ring groove are formed in the first end cover, the first flow guiding ring groove and the second flow guiding ring groove are separated from each other, the first flow guiding ring groove is communicated with the first inlet pipe, and the second flow guiding ring groove is communicated with the second inlet pipe.
As an optional embodiment, the top surface of the first packaging plate is provided with a diffusion groove communicated with the plurality of first membrane channels, and the joint surface of the first end cover and the diffusion groove is provided with a first through groove communicated with the first flow guiding ring groove and a second through groove communicated with the second flow guiding ring groove respectively.
As an alternative embodiment, the first through grooves and the second through grooves are sequentially and alternately distributed in the circumferential direction, and each of the first through grooves and the second through grooves corresponds to one of the independent spaces.
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:
step 1, pre-installation: the raw liquid inlet pipe is connected with a raw liquid pipe joint, the second concentrated liquid discharge pipe and the first concentrated liquid discharge pipe are connected with a concentrated liquid collecting device through two groups of pipe joints, the pressure-supply pipe is connected with external pressurizing equipment through the pipe joints, and the filtered liquid discharge pipe is connected with a purified water collecting device through the pipe joints;
step 2, water is introduced and pressurized: defining working pressures of the first hollow fiber membrane and the second hollow fiber membrane to be 0.2MPa, leading the stock solution into the stock solution inlet pipe, and then pressurizing the first filter cavity and the second filter cavity by the pressure-supply pipe to sequentially and alternately pressurize the first hollow fiber membrane, the first filter cavity and the second filter cavity until the internal and external pressure difference of the first hollow fiber membrane is 0.2MPa and the internal and external pressure difference of the second hollow fiber membrane is 0.2MPa;
step 3, filtering: the stock solution enters a first-stage filter element from a stock solution inlet pipe, circulates in a first membrane channel, permeates into a first filter cavity from micropores on the surface wall of a first hollow fiber membrane, completes primary filtration, passes through a guide hole to reach a second filter cavity, passes through a second hollow fiber membrane under the action of pressure to enter a second membrane channel, completes secondary filtration to obtain a filtrate, and is discharged and collected from a filtrate discharge pipe;
step 4, cleaning: when the first-stage filter element reaches a cleaning period, one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning are adopted for cleaning, concentrated water and dirt in the primary filtering process are discharged from a first concentrated liquid discharge pipe at the lower end of a first filter cavity, and when the second-stage filter element reaches the cleaning period, one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning are adopted for cleaning, dirt in the secondary filtering process is discharged from a second concentrated liquid discharge pipe at the lower end of a second filter cavity, and the cleaning period of the second-stage filter element is delayed in a prefiltering mode of the first-stage filter element;
the first filter cavity can be internally and uniformly divided into a plurality of independent spaces by a partition plate, the stock solution inlet pipe comprises a first inlet pipe and a second inlet pipe, a first flow guiding ring groove and a second flow guiding ring groove which are mutually separated and are respectively communicated with the first inlet pipe and the second inlet pipe are arranged in the first end cover, a diffusion groove communicated with a plurality of first membrane channels is formed in the top surface of the first packaging plate, a first through groove communicated with the first flow guiding ring groove and a second through groove communicated with the second flow guiding ring groove are respectively formed in the joint surface of the first end cover and the diffusion 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;
defining the cleaning period of the first-stage filter element as T, wherein two groups of first-stage filter elements are respectively communicated with the first inlet pipe and the second inlet pipe, and the cleaning time of the two groups of first-stage filter elements is staggered by T/2, so that the second-stage filter elements do not stop filtering when the first-stage filter elements are cleaned.
Compared with the prior art, the hollow black crystal fiber membrane filter assembly provided by the invention has the advantages that through the combination of the two pore filter elements with the two sizes, the main filter element adopts small-size pores and has larger volume, the pretreatment filter element adopts pores slightly larger than the main filter element and has smaller volume, and the stock solution is subjected to secondary filtration, so that the pretreatment filter element is relatively cleaned at high frequency and replaced at low cost, and the main filter element is replaced for a relatively long cleaning period and a relatively long service life; meanwhile, the cleaning periods of the pretreatment filter cores are staggered, so that the other pretreatment filter cores can be cleaned under the condition that the working state of part of the pretreatment filter cores is kept, and the main filter cores are 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 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 is a schematic cross-sectional view of the structure of FIG. 1 in the direction A-A;
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 filter module according to an embodiment of the invention, wherein a first end cap is provided with two sets of inlet pipes;
FIG. 5 is a schematic cross-sectional view of a hollow fiber membrane filtration module having a first end cap with two sets of inlet tubes according to an embodiment of the invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
At present, the hollow fiber membrane module is applied to the fields of water treatment, beverage, chemical industry, medicine and the like, solution or gas substances are separated, concentrated and purified by utilizing a membrane separation technology, micropores of a membrane wall are densely distributed, stock solution passes through one side of the membrane under a certain pressure, solvent and micromolecular solute penetrate through the membrane wall to be filtered out, and the macromolecule solute is intercepted by the membrane, but after a certain period (usually 1-3 months depending on different raw water), dirt attached to the surface of the membrane is required to be cleaned, and 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 alkaline cleaning method, an oxidizing cleaning agent cleaning method or an enzymatic cleaning agent cleaning method and the like), so that the cleaning period is short at present, and the cleaning is easy to cause membrane damage.
[ hollow fiber Membrane Filter Assembly ]
In connection with 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.
The primary filter element 2 and the secondary filter element 3 are provided with different fiber membrane apertures, so that the combination of two pore filter elements with small size is adopted by the main filter element, the pretreatment filter element adopts a slightly larger pore and a smaller volume relative to the main filter element, and secondary filtration is carried out on the stock solution, so that the pretreatment filter element is cleaned relatively at high frequency and replaced relatively at low cost, and the main filter element is replaced relatively for a long cleaning period and a long service life; meanwhile, the cleaning periods of the pretreatment filter cores are staggered, so that the other pretreatment filter cores can be cleaned under the condition that the working state of part of the pretreatment filter cores is kept, and the main filter cores are always in the working state.
The construction and use of the components of the foregoing embodiments will now be described in more detail with reference to the accompanying drawings.
Outer casing
Wherein, the outer shell 1 is provided as a hollow cylinder with an open upper end, and a deflector 11 is fixedly arranged inside.
For example, the outer casing 1 is made of a corrosion-resistant plastic or stainless steel, and the plastic casing has a compressive strength of 0.3MPa or less.
Further, a second filter cavity 102 is formed on the inner side of the baffle 11, and a first filter cavity 101 with a certain width is formed between the outer wall of the baffle 11 and the inner wall of the outer shell 1.
The baffle 11 is provided with a baffle hole 111 which communicates the first filter cavity 101 and the second filter cavity 102.
As an alternative example, the outer housing 1 is provided as a hollow cylinder having a circular, rectangular or regular polygon cross section.
For example, taking the cross-section of the outer casing 1 as a circular shape as an example, the baffle 11 and the side wall of the outer casing 1 are concentrically distributed, and the uniform ring portion of the first filter chamber 101 is on the outer peripheral side of the second filter chamber 102.
The bottom of the first filter cavity 101 is provided with a first filter element installation groove 14 for accommodating and installing the primary filter element 2, and the bottom of the second filter cavity 102 is provided with a second filter element installation groove 15 for accommodating and installing the secondary filter element 3, so that the filter element can be accurately installed in place.
Filter element
In connection with the illustration, the cartridge comprises a primary cartridge 2 disposed within a first filter chamber 101 and a secondary cartridge 3 disposed within a second filter chamber 102.
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 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.
As an alternative example, the first hollow fiber membranes 21 employ an inner pressure membrane, and the second hollow fiber membranes 31 employ an outer pressure membrane.
The first package plate 22 and the second package plate 32 are both formed by potting the ends of the hollow fiber membranes with epoxy.
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 for discharging the filtered liquid.
In a preferred embodiment, the first hollow fiber membrane 21 and the second hollow fiber membrane 31 are each a black crystal separation membrane, i.e., a hollow fiber membrane made of a casting solution into which graphene is incorporated.
Wherein the pore size of the second hollow fiber membrane 31 is smaller than that of the first hollow fiber membrane 21, so that the first hollow fiber membrane 21 can filter out relatively large suspended matters in the stock solution in advance to reduce the adhesion amount of the suspended matters on the second hollow fiber membrane 31.
As an alternative example, the pore diameter range of the second hollow fiber membrane 31 is set to 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 0.11 to 0.2 μm, and most of the suspended matters which can adhere to the second hollow fiber membrane 31 can be filtered out in advance, thereby prolonging the cleaning cycle of the second hollow fiber membrane 31.
As an alternative embodiment, the filter element comprises a plurality of primary filter elements 2, and the plurality of primary filter elements 2 are uniformly distributed on the periphery of the secondary filter element 3.
Therefore, the volume of the first-stage filter element 2 is relatively smaller, the number of the first hollow fiber membranes 21 is also reduced, and when part of the first hollow fiber membranes 21 are damaged, the damaged first-stage filter element 2 can be integrally replaced, so that replacement cost caused by damage of the hollow fiber membranes is saved.
Further, in order to separate each primary filter element 2 from each other, as shown in fig. 2, the first filter cavity 101 is internally and fixedly provided with a plurality of partition boards 16, two side edges of the partition boards 16 are respectively fixed on 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 primary filtrate filtered by each primary filter element 2 can be uniformly collected to the secondary filter element 3 from the peripheral side of the secondary filter element 3, the phenomenon that more dirt is attached to one side of the secondary filter element 3, and the surface of the secondary filter element 3 is pressed unevenly is avoided, and the cleaning period of the secondary filter element 3 is further delayed.
In the illustrated embodiment, six separate spaces are illustrated.
In order to further reduce the replacement cost of the single primary filter element 2, a greater number of independent spaces can be separated in practical applications.
Specifically, the cross-sectional area of the flow guiding hole 111 communicated with the second filter cavity 102 in each independent space is the same, the flow guiding holes 111 are arranged in a plurality and uniformly distributed on the flow guiding plate 11, the flow guiding holes 111 are arranged to be rectangular, round holes or polygonal holes, so that the effect of uniform flow guiding can be achieved, and primary filtrate in the independent space is guided into the second filter cavity 102.
In combination with the above embodiment, through setting up the filter core in two kinds of size holes, wherein main filter core adopts the hole of small-size, and the filter core that is great in volume, peripheral preliminary treatment filter core adopts the hole of relative big size, and the combination filter core that is less in volume, carry out preliminary filtration by a plurality of independent one-level filter cores 2 of outlying first and forego liquid, the one-level drainage after the preliminary filtration reachs second filter core 3 and carries out secondary filtration, reach the purpose of secondary filtration in this way, and with the relative frequent clearance of peripheral one-level filter core 2, low cost change, exchange the relatively long clearance cycle and the relatively long life of second filter core 3.
End cap
In the example shown in the figures, the second end cap 5 is arranged to cover the top of the baffle 11, being mounted to the inner wall of the baffle 11 in a screw-fit manner.
A sealing ring 401 is installed at the connection of the second end cap 5 and the baffle 11 for sealing the second filter chamber 102.
A filtrate discharge pipe 51 penetrating the second filter chamber 102 is provided at the 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 filtrate filtered in the second hollow fiber membranes 31 can be collected at the confluence chamber 501 and discharged from the filtrate discharge pipe 51.
In the example shown in the drawing, the first end cover 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 joint surfaces of the first end cover 4 and the outer casing 1 and the guide plate 11, so as to seal the first filter cavity 101.
Example 1
As shown in fig. 1 and 2, the first end cap 4 is provided with a stock solution inlet pipe 41 penetrating the first filter chamber 101, and the stock solution inlet pipe 41 can communicate with each independent space, so that the stock solution introduced from the stock solution inlet pipe 41 can be guided into each independent space.
Specifically, the outer wall of the outer casing 1 is fixedly provided with a first concentrated solution discharge pipe 13 communicated with the first filter cavity 101, and a first membrane channel 211 which is used for communicating a raw 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;
the outer side wall of the outer shell 1 is fixedly provided with a pressure supply pipe 17 communicated with the first filter cavity 101 and the second filter cavity 102, and the pressure supply pipe 17 is connected with external pressurizing equipment to keep the pressure difference between the inside and the outside of the second hollow fiber membrane 31 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 gaps of the first hollow fiber membranes 21, reaches the first filter chamber 101, flows into the second hollow fiber membranes 31 with lower pressure under the pressure of the pressurizing device connected to the pressure-supply pipe 17, reaches the second membrane channels 311 through the filtration of the second hollow fiber membranes 31 to form a filtrate, and is finally discharged from the filtrate discharge pipe 51.
Wherein, concentrate that produces in the primary filtration process and the suspension of first filter core 2 washings all are discharged from first concentrate calandria 13 of first filter chamber 101 bottom, and concentrate that produces in the secondary filtration and the suspension of second filter core 3 washings all are discharged from second concentrate calandria 12 of second filter chamber 102 bottom.
Example 2
As shown in fig. 4 and 5 in combination, unlike embodiment 1, the stock solution 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 inside to outside in the radial direction of the first end cap 4.
Further, in order to make the first inlet pipe 411 and the second inlet pipe 412 have independent flow guiding ring grooves respectively, the first end cover 4 is internally provided with a first flow guiding ring groove 42 and a second flow guiding ring groove 43, the first flow guiding ring groove 42 and the second flow guiding ring groove 43 are separated from each other, the first flow guiding ring groove 42 is communicated with the first inlet pipe 411, and the second flow guiding ring groove 43 is communicated with the second inlet pipe 412.
In order to allow the stock solution introduced from the first inlet pipe 411 and the second inlet pipe 412 to enter into different independent spaces, the top surface of the first package plate 22 is provided with diffusion grooves 221 communicating with the plurality of first film channels 211, the joint surface of the first end cover 4 and the diffusion grooves 221 is provided with first through grooves 421 communicating with the first flow guiding ring grooves 42 and second through grooves 431 communicating with the second flow guiding ring grooves 43, 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.
In this way, the two valves can be used to control the stock solutions entering the first inlet pipe 411 and the second inlet pipe 412 respectively and independently, and the cleaning periods of the two groups of first-stage filter elements 2 connected with the first inlet pipe 411 and the second inlet pipe 412 are staggered according to the cleaning periods of the first-stage filter elements 2, so that one group of first-stage filter elements 2 still keeps working in the cleaning state of the other group of first-stage filter elements 2, and the cleaning of the first-stage filter elements 2 in the working state of the second-stage filter elements 3 is realized.
In practical application, the stock solution inlet pipe 41 can also be arranged at more than two, corresponding first-stage filter cores 2 are arranged at more than two groups, the stock solution inlet pipe 41 corresponds to the groups of the first-stage filter cores 2, and after the first-stage filter cores 2 are damaged, one group of first-stage filter cores 2 can be opened in sequence to quickly find out the positions of the damaged first-stage filter cores 2 for replacement.
[ method of filtering with hollow fiber Membrane ]
The method for filtering raw water by using the hollow fiber membrane filter assembly comprises the following steps of:
step 1, pre-installation: the raw liquid inlet pipe 41 is connected to a raw liquid pipe joint, the second concentrated liquid drain pipe 12 and the first concentrated liquid drain pipe 13 are connected to a concentrated liquid collecting device through two sets of pipe joints, the pressure-supply pipe 17 is connected to an external pressurizing device through a pipe joint, and the filtered liquid outlet pipe 51 is connected to a purified water collecting device through a pipe joint.
Step 2, water is introduced and pressurized: the working pressures of the first hollow fiber membrane 21 and the second hollow fiber membrane 31 are defined to be 0.2MPa, so that the stock solution is firstly introduced into the stock solution inlet pipe 41, then the stock solution is pressurized into the first filter cavity 101 and the second filter cavity 102 by the pressure-supply pipe 17, and the first hollow fiber membrane 21, the first filter cavity 101 and the second filter cavity 102 are pressurized alternately in sequence with the standard that the pressurizing pressure is 0.02MPa each time until the internal and external pressure difference of the first hollow fiber membrane 21 is 0.2MPa, the internal and external pressure difference of the second hollow fiber membrane 31 is 0.2MPa, at this time, the pressures in the first filter cavity 101 and the second filter cavity 102 are 0.2MPa, and the pressure in the first hollow fiber membrane 21 is 0.4MPa.
Step 3, filtering: the stock solution enters the first-stage filter element 2 from the stock solution entering pipe 41, flows 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, primary filtration is finished, primary filtrate passes through the guide hole 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 finished to obtain filtered liquid, the filtered liquid is discharged and collected from the filtered liquid discharge pipe 51, so that the stock solution is primarily filtered by a plurality of peripheral independent first-stage filter elements 2 during filtration, primary filtered water after primary filtration reaches the second-stage filter element 3 for secondary filtration, and accordingly the purpose of secondary filtration is achieved, and the relatively long cleaning period and relatively long service life of the second-stage filter element 3 are replaced by relatively high-frequency cleaning and low-cost replacement of the peripheral first-stage filter elements 2.
Step 4, cleaning: when the first-stage filter element 2 reaches the cleaning period, one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning are adopted for cleaning, concentrated water and dirt in the primary filtering process are discharged from a first concentrated liquid discharge pipe 13 at the lower end of the first filter cavity 101, and when the second-stage filter element 3 reaches the cleaning period, one or more combination modes of forward flushing, backwashing, isobaric flushing and chemical cleaning are adopted for cleaning, dirt in the secondary filtering process is discharged from a second concentrated liquid discharge pipe 12 at the lower end of the second filter cavity 102, and the cleaning period of the second-stage filter element 3 is delayed in a prefiltering mode of the first-stage filter element 2.
Further, the first filter cavity 101 may be uniformly partitioned into a plurality of independent spaces by the partition plate 16, the raw liquid inlet pipe 41 includes a first inlet pipe 411 and a second inlet pipe 412, the first end cap 4 is internally provided with a first flow guiding ring groove 42 and a second flow guiding ring groove 43 which are mutually partitioned and respectively communicated with the first inlet pipe 411 and the second inlet pipe 412, and the top surface of the first package plate 22 is provided with a diffusion groove 221 communicated with the plurality of first film channels 211.
Correspondingly, 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 flow guiding ring groove 42 and a second through groove 431 communicated with the second flow guiding 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 an independent space.
Defining the cleaning cycle of the first-stage filter element 2 as T, communicating the two groups of first-stage filter elements 2 with the first inlet pipe 411 and the second inlet pipe 412 respectively, and dislocating T/2 in the cleaning time of the two groups of first-stage filter elements 2, so that when the first-stage filter elements 2 are cleaned, the second-stage filter elements 3 do not stop filtering, and the filtering process is continuous and is not influenced by the cleaning of the first-stage filter elements 2.
By combining the above embodiments, the combination of two pore filter elements with small size is adopted in the main filter element, the pretreatment filter element adopts a slightly larger pore and a smaller volume than the main filter element, the secondary filtration is carried out on the stock solution, the high-frequency cleaning and the low-cost replacement are carried out on the pretreatment filter element relatively, the main filter element is replaced with a relatively long cleaning period and a relatively long service life, and meanwhile, the cleaning period of the pretreatment filter element is staggered, so that the rest pretreatment filter elements can be cleaned under the working state of the part of pretreatment filter elements, and the main filter element is always in the working state.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. A hollow black crystal fiber membrane filter assembly, comprising:
the filter comprises an outer shell (1) which is arranged as a hollow column with an open upper end, wherein a guide plate (11) is fixedly arranged in the outer shell, a second filter cavity (102) is formed in 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) which is communicated with the first filter cavity (101) and 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);
a second end cover (5) which is arranged to cover the top of the guide plate (11) and is used for sealing the second filter cavity (102), wherein a filtered liquid discharge pipe (51) communicated with the second filter 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 raw liquid inlet pipe (41) communicated with the first filter cavity (101) is arranged on the first end cover (4);
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 to be an internal pressure membrane, and a first membrane channel (211) which is communicated with the raw 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 drain pipe (12) communicated with the second filter cavity (102) is fixedly arranged on the outer wall of the outer shell (1), the second hollow fiber membrane (31) is arranged as an outer pressing membrane, and a second membrane channel (311) communicated with the filtering liquid drain pipe (51) is arranged inside the second hollow fiber membrane (31);
the pore diameter of the second hollow fiber membrane (31) is smaller than the pore diameter of the first hollow fiber membrane (21);
the pressure-supply 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 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;
wherein, a plurality of first-stage filter cores (2) are uniformly distributed on the periphery of the second-stage filter cores (3);
the pore diameter range of the second hollow fiber membrane (31) is set to be 0.1-1 mu m, and the pore diameter of the first hollow fiber membrane (21) is 1.1-2 times that of the second hollow fiber membrane (31).
2. The hollow black crystal fiber membrane filter assembly according to claim 1, wherein a plurality of partition plates (16) are fixedly arranged in the first filter cavity (101), and two side edges of the partition plates (16) are respectively fixed on the inner wall of the outer shell (1) and the outer wall of the guide plate (11) so as to uniformly divide the first filter cavity (101) into independent spaces.
3. The hollow black crystal fiber membrane filter assembly according to claim 2, wherein each of the independent spaces is identical in cross-sectional area to the flow guide hole (111) communicating with the second filter chamber (102), and a plurality of flow guide holes (111) are uniformly distributed on the flow guide plate (11).
4. A hollow black crystal fiber membrane filter assembly according to any of claims 1-3, wherein the outer housing (1) is provided as a hollow cylinder with a circular, rectangular or regular polygon cross section.
5. Hollow black-crystal fiber membrane filter assembly according to claim 4, characterized in that the outer housing (1) is a plastic or stainless steel housing.
6. The hollow black crystal fiber membrane filter assembly according to claim 2, wherein the stock solution 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).
7. The hollow black crystal fiber membrane filter assembly according to claim 6, wherein a first guide ring groove (42) and a second guide ring groove (43) are formed in the first end cover (4), the first guide ring groove (42) and the second guide ring groove (43) are separated from each other, the first guide ring groove (42) is communicated with the first inlet pipe (411), and the second guide ring groove (43) is communicated with the second inlet pipe (412).
8. The hollow black crystal fiber membrane filter assembly according to claim 7, wherein the top surface of the first package plate (22) is provided with diffusion grooves (221) communicated with the plurality of first membrane channels (211), and the joint surface of the first end cover (4) and the diffusion grooves (221) is provided with a first through groove (421) communicated with the first flow guiding ring groove (42) and a second through groove (431) communicated with the second flow guiding ring groove (43) respectively.
9. The hollow black crystal fiber membrane filter assembly according to claim 8, wherein the first through grooves (421) and the second through grooves (431) are alternately distributed in sequence in the circumferential direction, and the first through grooves (421) and the second through grooves (431) correspond to one of the independent spaces, respectively.
10. A filtration method based on the hollow black crystal fiber membrane filtration module according to any one of claims 1 to 9, comprising the steps of:
step 1, pre-installation: the raw liquid inlet pipe (41) is connected with a raw liquid pipe joint, the second concentrated liquid pipe (12) and the first concentrated liquid pipe (13) are connected with a concentrated liquid collecting device through two groups of pipe joints, the pressure supply pipe (17) is connected with external pressurizing equipment through a pipe joint, and the filtered liquid discharge pipe (51) is connected with a purified water collecting device through a pipe joint;
step 2, water is introduced and pressurized: defining working pressures of the first hollow fiber membrane (21) and the second hollow fiber membrane (31) to be 0.2MPa, leading the stock solution into the stock solution inlet pipe (41), and then pressurizing the first filter cavity (101) and the second filter cavity (102) by the pressure supply pipe (17) to sequentially and alternately pressurize the first hollow fiber membrane (21), the first filter cavity (101) and the second filter cavity (102) until the internal and external pressure difference of the first hollow fiber membrane (21) is 0.2MPa and the internal and external pressure difference of the second hollow fiber membrane (31) is 0.2MPa;
step 3, filtering: the stock solution enters the first-stage filter element (2) from the stock solution entering pipe (41), flows in the first membrane channel (211) and permeates into the first filter cavity (101) from micropores in the surface wall of the first hollow fiber membrane (21), primary filtration is finished, primary filtrate passes through the guide hole (111) to reach the second filter cavity (102), and passes through the second hollow fiber membrane (31) to enter the second membrane channel (311) under the action of pressure, secondary filtration is finished 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), and 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 prefiltering mode of the primary filter element (2);
the first filter cavity (101) can be internally and uniformly divided into a plurality of independent spaces by the partition plate (16), the stock solution inlet pipe (41) comprises a first inlet pipe (411) and a second inlet pipe (412), first guide ring grooves (42) and second guide ring grooves (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), diffusion grooves (221) communicated with a plurality of first membrane channels (211) are formed in the top surface of the first packaging plate (22), first through grooves (421) communicated with the first guide ring grooves (42) and second through grooves (431) communicated with the second guide ring grooves (43) are respectively formed in the joint surface of the first end cover (4) and the diffusion grooves (221), the first through grooves (421) and the second through grooves (431) are alternately distributed in the circumferential direction in sequence, and the first through grooves (421) and the second through grooves (431) respectively correspond to the independent spaces;
defining the cleaning period of the first-stage filter element (2) as T, wherein two groups of the first-stage filter elements (2) are respectively communicated with the first inlet pipe (411) and the second inlet pipe (412), and the cleaning time of the two groups of the first-stage filter elements (2) is staggered by T/2, so that when the first-stage filter elements (2) are cleaned, the second-stage filter elements (3) do not stop filtering.
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| HUE044836T2 (en) * | 2013-04-25 | 2019-11-28 | Toray Industries | Cartridge type hollow fiber membrane module |
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| CN204918200U (en) * | 2015-07-02 | 2015-12-30 | 苏州许叉叉家居用品制造有限公司 | Carbon fiber water purifier filter element |
| CN209934478U (en) * | 2018-12-25 | 2020-01-14 | 宁波方太厨具有限公司 | Hollow fiber membrane filter element |
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