CN114632422A - External pressure type hollow fiber nanofiltration membrane component - Google Patents
External pressure type hollow fiber nanofiltration membrane component Download PDFInfo
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- CN114632422A CN114632422A CN202210245793.8A CN202210245793A CN114632422A CN 114632422 A CN114632422 A CN 114632422A CN 202210245793 A CN202210245793 A CN 202210245793A CN 114632422 A CN114632422 A CN 114632422A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/021—Manufacturing thereof
- B01D63/022—Encapsulating hollow fibres
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- 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
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
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- 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
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- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
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- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
An external pressure type hollow fiber nanofiltration membrane component comprises an upper seal head, a lower seal head, an upper membrane filament bundle distribution plate, a lower membrane filament bundle distribution plate, a membrane shell, an external pressure type nanofiltration membrane filament bundle, an inner cylindrical baffle, an outer cylindrical baffle, a lower seal head water inlet, an upper seal head purified water outlet and a concentrated water outlet. In the separation process, after entering the lower end enclosure from the water inlet, a solution enters the membrane assembly through the flow guide holes in the lower membrane filament distribution plate, rises to the top of the inner cylindrical baffle, is deflected downwards to the bottom of the outer cylindrical baffle, then rises to the upper membrane filament distribution plate, is filtered by the nanofiltration membrane filament bundle, purified water flows out of the membrane assembly through the purified water outlet of the upper end enclosure, and most of impurities such as inorganic salt and the like are discharged through the concentrated water outlet on the side surface of the membrane shell. The external pressure type hollow fiber nanofiltration membrane component with the internal and external baffles can ensure that the filter medium is fully contacted with nanofiltration membrane filaments, avoid short circuit, improve the filtration efficiency of the nanofiltration membrane and be beneficial to cleaning and regeneration of the nanofiltration membrane in the use process.
Description
Technical Field
The invention relates to membrane separation equipment for water treatment processes such as drinking water purification, domestic sewage, industrial sewage deep purification and recycling and the like, in particular to an external pressure type hollow fiber nanofiltration membrane component, belonging to the technical field of membrane separation.
Background
The nanofiltration membrane is a novel pressure-driven separation membrane with a separation scale between an ultrafiltration membrane and a reverse osmosis membrane, and has been widely applied in the fields of food processing, chemical engineering, purification and separation of medical intermediates, water treatment and the like due to low operation pressure and large flux.
Most nanofiltration membrane components on the market are roll-type membranes at present, and are mainly applied to drinking water deep purification water treatment, but in solid-liquid separation application scenes such as biological medicines, chemical engineering and sewage treatment, the roll-type membranes are easy to pollute and block, and the service life of the nanofiltration membranes is seriously influenced.
The hollow fiber nanofiltration membrane combines the advantages of nanofiltration membranes and hollow fiber membranes, is in a self-supporting structure, and has the advantages of high filling density, strong pollution resistance, high product recovery rate, low replacement cost and the like. The hollow fiber nanofiltration membrane is divided into an internal pressure type and an external pressure type. The preparation process of the internal pressure type hollow fiber nanofiltration membrane is complex and is difficult to realize large-scale industrial production. The external pressure type membrane component is more suitable for substance separation of biological medicines and chemical industries and water treatment environments with higher pollutant content such as domestic sewage, industrial wastewater and the like because the intercepted pollutants are gathered outside the membrane wires, the pollutant carrying capacity is large, and air-water cleaning is easy to carry out.
The external-compression hollow fiber membrane module applied at present almost all is that raw water enters the interior of the module from a side water inlet, so that membrane filaments are subjected to water inlet impact for a long time, and the water flow distribution on the surface of the membrane is uneven to generate short-circuit bias flow. Therefore, the membrane filaments can be gradually elongated in the long-term use process of the membrane component, the membrane filaments can be mutually crossed and wound under the alternating action of filtration and washing, and part of the membrane filaments can be pulled into a concentrated water outlet or a cleaning solution outlet along with water flow to cause damage. The external pressure type hollow fiber nanofiltration membrane component is internally provided with the baffle plate, short circuit bias flow can be avoided, certain space is reserved between membrane filaments, air scrubbing and membrane filament swinging are facilitated, pollutants on the outer surfaces of the membrane filaments are removed, the defects of the external pressure type nanofiltration membrane component can be effectively overcome, and the application range of the nanofiltration membrane is widened.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides the external pressure type hollow fiber nanofiltration membrane component which is reasonable in structure and convenient to manufacture and the preparation method thereof, and further improves the operation reliability and stability of nanofiltration equipment.
In order to achieve the above object, the technical scheme adopted by the invention is as follows: the utility model provides an external pressure formula hollow fiber nanofiltration membrane subassembly, by last low head, upper and lower membrane tow distributing plate, membrane shell, external pressure formula receive the membrane tow, interior outer cylindrical baffle, low head water inlet, upper cover water purification export and dense water export constitute, its characterized in that: the middle of the lower membrane filament bundle distribution plate is provided with a flow guide hole, in the separation process, a solution enters from a water inlet of the lower end enclosure, enters the membrane assembly through the flow guide hole, rises to the top of the inner cylindrical baffle, then flows downwards to the bottom of the outer cylindrical baffle, then rises to the upper membrane filament distribution plate, and after the outer pressure type nanofiltration membrane filament bundle is filtered, purified water flows out of the membrane assembly through a purified water outlet of the upper end enclosure, and most of impurities such as inorganic salt and the like pass through the concentrated water outlet to be discharged.
Furthermore, the external-pressure type nanofiltration membrane filament bundle is composed of external-pressure type nanofiltration membrane filaments, the lower ends of external-pressure type nanofiltration membrane filament holes are closed, and the upper ends of the external-pressure type nanofiltration membrane filament holes are open.
Furthermore, the external-pressure type nanofiltration membrane tows are uniformly distributed in an annular shape inside the nanofiltration membrane component through the upper and lower membrane tow distribution plates, and the external-pressure type nanofiltration membrane tows are cylindrical membrane tows with the diameter of 1-5 cm.
Further, use the original point to be annular evenly distributed membrane silk bundle and water conservancy diversion hole as the center on the lower membrane silk bundle distribution plate, the number of turns of membrane silk bundle is 3 ~ 10 circles, the number of turns in water conservancy diversion hole is 1 ~ 3 circles.
Furthermore, the upper film tow distribution plate is used for uniformly distributing the film tows in an annular shape by taking the original point as the center, and the distribution positions and the number of the film tows are consistent with those of the film tows on the lower film tow distribution plate.
Further, the inner cylindrical baffle and the outer cylindrical baffle are arranged on the upper film tow distribution plate and the lower film tow distribution plate, the inner cylindrical baffle is arranged on the lower film tow distribution plate, the outer cylindrical baffle is arranged on the upper film tow distribution plate, the inner cylindrical baffle and the outer cylindrical baffle form a group of baffles, the height of the baffles is lower than the length of the film assembly, and the group number of the baffles is 1-3.
Furthermore, a porous water distributor is arranged at the concentrated water outlet to prevent the membrane filaments from being pulled apart due to the fact that the membrane filaments are taken out of the membrane shell when the flow velocity of fluid is too high in the filtering or flushing process.
The invention has the following technical effects: (1) the invention adopts the beam-splitting packaging process, thereby avoiding the phenomenon of mutual cross winding among the membrane wires in the traditional packaging process. (2) The built-in cylindrical flow baffle can reduce the impact of fluid on the membrane filaments, avoid short circuit bias flow and improve the separation efficiency of the nanofiltration membrane. (3) By adopting the external pressure type packaging method, the membrane assembly has large pollutant carrying capacity, after the membrane assembly runs, pollutants at the packaging end are easy to clean through backwashing and air scrubbing, the problems of cleaning dead zones and dead angles are eliminated, and the service life of the membrane assembly is prolonged.
Drawings
Fig. 1 is a cross-sectional structure view of an external pressure type hollow fiber nanofiltration membrane module according to the present invention.
FIG. 2 is a plan view of the lower membrane tow distribution plate according to the embodiment.
FIG. 3 is a plan view of the upper membrane tow distribution plate according to the embodiment.
Figure 4 is a cross-sectional view of a hollow fiber nanofiltration membrane assembly a-a according to an embodiment.
Figure 5 is a cross-sectional view of a hollow fiber nanofiltration membrane assembly B-B according to an embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
The cross-sectional structure schematic diagram of the external pressure type hollow fiber nanofiltration membrane component is shown in figure 1, and comprises a water inlet 1, upper and lower end enclosures 2 and 11, upper and lower membrane tow distribution plates 3 and 10, external pressure type nanofiltration membrane tows 5, inner and outer cylindrical baffles 4 and 7, a membrane shell 6, a water distributor 8, a concentrated water outlet 9, a purified water outlet 12 and a diversion hole 13. The water inlet 1 is positioned at the center of the lower seal head 2, the water inlet 1 and the lower seal head 2 are manufactured by injection molding and casting through an integral forming method, and the lower seal head 2 is connected with the membrane shell 6 through threads. The purified water outlet 12 is positioned at the center of the upper seal head 11, the purified water outlet 12 and the upper seal head 11 are manufactured by injection molding and casting through an integral forming method, and the upper seal head 11 is connected with the membrane shell 6 through threads. The membrane shell 6 and the concentrated water outlet 9 are manufactured by injection molding and casting through an integral forming method. The upper and lower seal heads 2, 11 and the membrane shell 6 form the outer shell of the external pressure type hollow fiber nanofiltration membrane component, and the pressure bearing capacity of the outer shell is more than 0.5 MPa.
The external pressure type nanofiltration membrane tow 5 consists of external pressure type nanofiltration membrane filaments, the membrane tow 5 penetrates through membrane filament holes at corresponding positions on the upper and lower membrane filament distribution plates 3 and 10, glue is injected into the membrane filament holes, and the membrane filaments are firmly bonded and sealed. After all the membrane tows are installed, the upper and lower membrane tow distribution plates 3 and 10 are installed on the membrane shell 6, and the upper and lower membrane tow distribution plates 3 and 10 are connected with the membrane shell 6 through clamping grooves and sealed by sealant. After the film silk bundle distribution plate is installed, a cutter is used for cutting off redundant film silk along the film silk bundle distribution plate, so that the end face of the film silk is flush with the outer plane of the distribution plate, and a film silk hole on the lower film silk distribution plate 3 is sealed by sealant.
As shown in fig. 2 and 3, the nanofiltration membrane tows 5 are uniformly distributed in the nanofiltration membrane component in an annular shape through the upper and lower membrane filament distribution plates 3 and 10, and the membrane tows 5 are cylindrical and have the diameter of 1-5 cm. Use the original point to be annular evenly distributed membrane silk bundle 5 and water conservancy diversion hole 13 on the lower membrane silk bundle distribution plate 3 as the center, the number of turns of membrane silk bundle 5 is 3 ~ 10 circles, and the number of turns of water conservancy diversion hole 13 is 1 ~ 3 circles. The upper film tow distribution plate 10 is used for uniformly distributing the film tows 5 in an annular shape by taking the original point as the center, and the distribution positions and the number of the film tows are consistent with those of the film tows on the lower film tow distribution plate 10.
Meanwhile, cylindrical baffles 4 and 7 are respectively arranged on the upper membrane tow distribution plate 3 and the lower membrane tow distribution plate 10, wherein the cylindrical baffle on the lower distribution plate 3 is an inner-layer baffle 4, the cylindrical baffle on the upper distribution plate 10 is an outer-layer baffle 7, the inner-layer baffle and the outer-layer baffle form a group of baffles, the height of the baffles is lower than the length of the membrane assembly, and the group number of the baffles is 1-3. The sectional views A-A and B-B of the membrane module are shown in FIG. 4 and FIG. 5, respectively.
In addition, a porous water distributor 8 is arranged at the concentrated water outlet 9 to prevent the membrane filaments from being pulled apart due to the membrane filaments being taken out of the membrane shell by the fluid flow velocity which is too high in the filtering or flushing process.
In the separation process, after entering the lower end enclosure 2 from the water inlet 1, a solution enters the membrane assembly through the flow guide holes 13 in the lower membrane tow distribution plate 3, rises to the top of the inner cylindrical baffle 4 and then deflects downwards, rises to the bottom of the outer cylindrical baffle 7 and then rises to the upper membrane tow distribution plate 10, after being filtered by the hollow fiber nanofiltration membrane, purified water flows out of the membrane assembly through the upper end enclosure purified water outlet 12, and most of impurities such as inorganic salt and the like are discharged through the concentrated water outlet 9 on the side surface of the shell.
Claims (7)
1. The utility model provides an external pressure formula hollow fiber nanofiltration membrane subassembly, by last low head, upper and lower membrane tow distributing plate, membrane shell, external pressure formula receive the membrane tow, interior outer cylindrical baffle, low head water inlet, upper cover water purification export and dense water export constitute, its characterized in that: the lower membrane silk bundle distribution plate is provided with a diversion hole, in the separation process, a solution enters from a water inlet of the lower end enclosure, then enters the membrane assembly through the diversion hole, rises to the bottom of the outer cylindrical baffle after the top of the inner cylindrical baffle, and then rises to the upper membrane silk distribution plate, and after the external pressure type nanofiltration membrane silk bundle is filtered, purified water flows out of the membrane assembly from a purified water outlet of the upper end enclosure, and most of impurities such as inorganic salt and the like pass through the concentrated water outlet to be discharged.
2. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: the external-pressure type nanofiltration membrane tow consists of external-pressure type nanofiltration membrane filaments, the lower ends of the external-pressure type nanofiltration membrane filament holes are closed, and the upper ends of the external-pressure type nanofiltration membrane filament holes are open.
3. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: the external-pressure type nanofiltration membrane tows are uniformly distributed in the nanofiltration membrane component in an annular shape through the upper and lower membrane tow distribution plates, are cylindrical and have the diameter of 1-5 cm.
4. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: use the original point to be annular evenly distributed membrane silk bundle and water conservancy diversion hole as the center on the lower membrane silk bundle distribution plate, the number of turns of membrane silk bundle is 3 ~ 10 circles, the number of turns in water conservancy diversion hole is 1 ~ 3 circles.
5. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: the upper film tow distribution plate is used for uniformly distributing the film tows in an annular shape by taking the original point as the center, and the distribution positions and the number of the film tows are consistent with those of the film tows on the lower film tow distribution plate.
6. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: the inner cylindrical baffle and the outer cylindrical baffle are arranged on the upper film tow distribution plate and the lower film tow distribution plate, the inner cylindrical baffle is arranged on the lower film tow distribution plate, the outer cylindrical baffle is arranged on the upper film tow distribution plate, the inner cylindrical baffle and the outer cylindrical baffle form a group of baffles, the heights of the baffles are lower than the length of the film assembly, and the group number of the baffles is 1-3.
7. The external pressure type hollow fiber nanofiltration membrane module according to claim 1, wherein: the concentrated water outlet is provided with a porous water distributor to prevent the membrane filaments from being pulled apart due to the membrane filaments being taken out of the membrane shell by the fluid flow velocity in the filtering or washing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245793.8A CN114632422A (en) | 2022-03-14 | 2022-03-14 | External pressure type hollow fiber nanofiltration membrane component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245793.8A CN114632422A (en) | 2022-03-14 | 2022-03-14 | External pressure type hollow fiber nanofiltration membrane component |
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| CN114632422A true CN114632422A (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210245793.8A Pending CN114632422A (en) | 2022-03-14 | 2022-03-14 | External pressure type hollow fiber nanofiltration membrane component |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116272379A (en) * | 2023-03-29 | 2023-06-23 | 泰州南潇新材料科技有限公司 | Nanofiltration membrane element with hierarchical filtering function |
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2022
- 2022-03-14 CN CN202210245793.8A patent/CN114632422A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116272379A (en) * | 2023-03-29 | 2023-06-23 | 泰州南潇新材料科技有限公司 | Nanofiltration membrane element with hierarchical filtering function |
| CN116272379B (en) * | 2023-03-29 | 2023-10-20 | 泰州南潇新材料科技有限公司 | Nanofiltration membrane element with hierarchical filtering function |
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