Hollow fiber membrane module structure and manufacturing method thereof

Abstract

The invention relates to a hollow fiber membrane module structure and a manufacturing method, and belongs to the technical field of membrane separation equipment. The invention aims to solve the technical problems of membrane filament distribution, strength reliability and the like when the conventional hollow fiber membrane module is subjected to packaging work. The packaging method for the column type hollow fiber membrane module can effectively reduce the highest temperature in the solidification process of the sealing hard glue, and has important significance in improving the yield of the column type hollow fiber membrane module and prolonging the service life of the membrane module.

Description

Technical Field

[0001] The present invention relates to a hollow fiber membrane module structure and a manufacturing method, belonging to the technical field of membrane separation equipment. Background Art

[0002] As a green and efficient water treatment technology, membrane separation technology has shown significant application value in the fields of wastewater treatment and resource recovery, seawater desalination, etc. due to its pure physical separation characteristics, no secondary pollution, and mild operating conditions. Among them, hollow fiber nanofiltration membranes are widely used in scenarios such as industrial wastewater reuse, drinking water purification, and seawater desalination pretreatment due to their easy scalability and flexible membrane module forms.

[0003] However, there are significant technical bottlenecks in the gluing process of existing columnar hollow fiber membrane modules when the diameter of the membrane module is large. For example, although traditional encapsulation methods can achieve effective sealing, uneven distribution of membrane filaments is likely to occur during actual operation, resulting in a sharp drop in flux in local areas, which in turn accelerates membrane fouling and shortens the service life of the module. At the same time, some high-performance sealing hard glues (such as epoxy resin) generate a large amount of heat during the curing process, and the temperature rise inside the colloid is too high, which will cause the accumulation of thermal stress, resulting in the deterioration of the strength of the glue layer and the decline of the performance of the membrane filaments in the adjacent area, seriously affecting the reliability of the module. This problem is particularly significant when the diameter of the membrane module is large. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the problems of membrane filament distribution, strength reliability, etc. existing in the existing hollow fiber membrane module during the encapsulation process. The present invention develops a packaging method for a columnar hollow fiber membrane module that can effectively reduce the maximum temperature during the solidification of the sealing hard glue, which is of great significance for improving the yield rate of columnar hollow fiber membrane modules and extending the service life of membrane modules.

[0005] A hollow fiber membrane module structure includes a membrane shell, a water inlet end and a water production end, and hollow fiber membrane filaments located in the shell; At the water inlet end, a fixing ring formed by splicing a plurality of fan-shaped units is sleeved, and the ends of the hollow fiber membrane filaments are inserted into the fixing ring; the channels at the ends of the hollow fiber membrane filaments are blocked, and a water flow channel communicating with the water production end is left in the middle of the fixing ring formed by the fan-shaped units; At the water production end, a fixing ring formed by splicing a plurality of fan-shaped units is sleeved, and the ends of the hollow fiber membrane filaments are inserted into the fixing ring; the channels at the ends of the hollow fiber membrane filaments are open, and a water flow channel communicating with the water inlet end is left in the middle of the fixing ring formed by the fan-shaped units; For the water inlet end and the water production end, the fan-shaped units are sealed with glue, and there is also glue sealing between the hollow fiber membrane filaments in the fan-shaped units.

[0006] For the water inlet end and the water production end, the glue seal between the hollow fiber membrane filaments faces the side towards the middle of the membrane housing, and the root protection glue for the membrane filaments is filled.

[0007] On the water flow channel at the water inlet end, a central pipe at the water inlet end is connected.

[0008] On the water flow channel at the water production end, a central pipe at the water production end is connected.

[0009] For the water inlet end and the water production end, the number of fan-shaped units is 2 - 24.

[0010] Inside the fan-shaped unit at the water inlet end, there is still a pipeline left between the hollow fiber membrane filament bundles.

[0011] At the water production end, a water production end head is provided. On the water production end head, there is a permeate side discharge port that is connected to the hollow fiber membrane filament channel and collects the permeate, and a rejection side discharge port that is connected to the central pipe at the water production end.

[0012] The manufacturing method of the above-mentioned hollow fiber membrane module includes the following steps: S1. Insert one end of the hollow fiber membrane filament bundle into the fan-shaped unit, and then insert a placeholder pin into the filament bundle; after installing a glue injection mold on the fan-shaped unit, inject glue between the filament bundles. After curing, remove the glue injection mold to obtain the fan-shaped unit at the water inlet end; pre-coat the other end of the hollow fiber membrane filament bundle with a plugging substance, then insert it into the fan-shaped unit. After installing a glue injection mold on the fan-shaped unit, inject glue between the filament bundles. After curing, remove the glue injection mold to obtain the fan-shaped unit at the water production end; S2. Splice the fan-shaped units at the water inlet end with each other to form a fixed ring, splice the fan-shaped units at the water production end with each other to form a fixed ring, and sleeve them between the membrane housings; then respectively install a glue injection mold at the water inlet end and a glue injection mold at the water production end on the fixed rings at the water inlet end and the water production end, inject glue into them, and remove the molds after curing; S3. Perform a cutting process on the water production end to remove the plugging substance; remove the placeholder pin at the water inlet end to form a pipeline.

[0013] It also includes that in the step S2, there is also a step of injecting a protection glue for protecting the roots of the membrane filaments into the side where the glue seal between the hollow fiber membrane filaments at the water inlet end and the water production end faces the middle of the membrane housing; and the glue injection is carried out through the openings on the membrane housing.

[0014] The beneficial effects of the present invention are: The membrane module of the present invention effectively improves the yield through modular manufacturing and encapsulation, and avoids component quality problems caused by poor sealing in some areas during integral pouring and curing; At the same time, based on modular assembly, it has the advantage of improving the uniformity of membrane filament distribution; Since a sector unit is used for fixation during the encapsulation and pouring process, and the sector unit has a large heat transfer area, it can avoid the problem of low fixing strength of the membrane filaments caused by heat release due to ineffective heat dissipation during the curing process of traditional integral glue. When using a positioning pin for the positioning manufacturing process of the water inlet channel, the membrane filaments can be fixed in advance. On the one hand, it ensures the uniformity of the distribution of the membrane filaments, and on the other hand, it makes the water channel structure formed after removing the positioning pin more uniform and the position controllable.

[0015] After forming the water channel with a positioning pin at the water inlet end and allowing the water to enter the outside of the membrane filaments inside the component from the water channel, the membrane filaments on the water inlet side can bear a large water inlet pressure, ensuring the service life of the sealing structure on the water inlet side. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Main components at the water inlet and outlet ends of the membrane module Figure 2 : Internal assembly drawing of the main components at the water inlet and outlet ends of the membrane module Figure 3 : Schematic diagram of the assembled structure of the sector unit Figure 4 : Schematic diagram of injecting glue into the sector unit at the water inlet end Figure 5 : Schematic diagram of injecting glue into the sector unit at the water production end Figure 6 : Schematic diagram of sealing glue at the water inlet end Figure 7 : Schematic diagram of sealing glue at the water production end Figure 8 : Schematic diagram of the structure of the water production end head Among them, 1, hollow fiber membrane filaments; 2-A, sector unit at the water inlet end; 2-B, sector unit at the water production end; 2-1, sector unit housing; 2-2, positioning pin; 2-3, glue injection mold; 3, sealing hard glue; 4, protective glue at the root of the membrane filaments; 5, membrane shell; 6, sealing glue at the water inlet end; 6-1, central pipe at the water inlet end; 6-2, glue injection mold at the water inlet end; 7, sealing glue at the water production end; 7-1, central pipe at the water production end; 7-2, glue injection mold at the water production end; 8, water production end head; 8-1, permeate side discharge port; 8-2, retentate side discharge port. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention discloses a modularized encapsulation method for a hollow fiber nanofiltration membrane module, including: hollow fiber membrane filaments 1, sector units (such as Figure 1As shown in the figure, it is divided into the inlet-end sector unit 2-A and the water-production-end sector unit 2-B, the sealing hard glue 3, the root protection glue 4 of the membrane filaments, the membrane shell 5, the inlet-end sealing glue 6, and the water-production-end sealing glue 7. Among them, the two ends of the membrane shell 5 are respectively the inlet end and the water-production end. Circular rings formed by splicing fan-shaped units (fan-shaped fixing rings) are respectively installed at the two ends. Here, the fan-shaped units are used to fix the hollow fiber membrane filament bundle. The number of fan-shaped units at one end can be 2-24. In the following embodiments, fan-shaped units formed by equally dividing a circle into 6 parts are adopted; and a flow channel is reserved inside the circular ring formed after the fan-shaped units are spliced for inlet water and water production. Some more specific structures are as follows: For the inlet end, a certain amount of hollow fiber membrane filaments 1 are pre-placed into the fan-shaped unit housing 2-1, and then a placeholder pin 2-2 is installed in the membrane filament bundle (after manufacturing is completed, the placeholder pin is taken out to form a pipeline), and then a glue injection mold 2-3 is installed. Then, the sealing hard glue 3 is injected. After curing, the glue injection mold 2-3 is removed. After 6 fan-shaped units are combined around the inlet-end central tube 6-1, they are installed into the membrane shell 5, and then the inlet-end glue injection mold 6-2 is installed. After installation is completed, the inlet-end sealing glue 6 is injected. After it is completely hardened, the root protection glue 4 of the membrane filaments is injected at the position where the hollow fiber membrane filaments are located in the sealing hard glue 3. After the root protection glue 4 of the membrane filaments is cured, the inlet-end glue injection mold 6-2 is removed, and the placeholder pin 2-2 is pulled out, which is the inlet-end structure. For the water-production end, the other end face of the hollow fiber membrane filaments 1 at the water-production end (i.e., the end face on the water-production end side) is sealed with putty, hot melt glue or other substances with a plugging effect, and then the water-production-end central tube 7-1 and the water-production-end glue injection mold 7-2 are installed. The water-production-end sealing glue 7 is injected. After it is completely hardened, the root protection glue 4 of the membrane filaments is injected. After the root protection glue 4 of the membrane filaments is cured, the water-production-end mold 7-2 is removed, and then the membrane filament sealing hard glue 3 is cut, and a part of the sealing hard glue and the blocked end face of the hollow fiber membrane filaments 1 are cut off to expose the cavity side of the hollow fiber membrane filaments 1, which is the water-production-end structure. The encapsulation method of the hollow fiber membrane module of the present invention first uniformly manufactures the hollow fiber membrane filaments into a membrane filament module called a "fan-shaped unit", and then performs subsequent loading and glue injection, which can effectively improve the production efficiency and the uniformity of the distribution of the membrane filaments inside the hollow fiber membrane module. In addition, since the specific surface area of the fan-shaped unit 2 is larger than that of the inlet-end sealing glue 6, when using a glue with a large heat release during the solidification process, it can also effectively control the temperature inside the glue block and avoid structural defects and damage to the strength and performance of the membrane filaments caused by too high temperature. When injecting the inlet-end sealing glue 6, the presence of the fan-shaped unit also reduces the amount of glue used, and the fan-shaped unit itself has a certain heat absorption capacity, which can effectively reduce the maximum temperature that can be reached inside the glue block during the glue injection process.

[0020] Based on the above method, the specific implementation steps of the present invention are as Figures 4 - 7 shown: The manufacturing method of the hollow fiber membrane module includes the following steps: Step 1: Select an appropriate amount of hollow fiber membrane filaments 1, tie both ends, and determine the water inlet end and the water production end. Cut the water inlet end of the hollow fiber membrane filaments 1 flush, then insert them into the fan-shaped unit housing 2-1, install the positioning pin 2-2, and sleeve the glue injection mold 2-3 at the end. Hang the water production end of the membrane filament bundle upward on the hanging rack, and support the bottom fan-shaped unit - glue injection mold 2-3 and the fan-shaped unit - housing 2-2 with brackets.

[0021] Step 2: Pour the sealing hard glue 3 into the fan-shaped unit housing 2-1. After waiting for the glue to cure, remove the glue injection mold 2-3. Thus, the water inlet end fan-shaped unit 2-A is obtained.

[0022] Step 3: Place the hollow fiber membrane filament bundle with the water inlet end fan-shaped unit 2-A already made on the table, cut the water production end flush, and apply a substance such as putty that can seal the holes at the end face of the membrane filaments to completely seal the holes at the end face of the membrane filaments 1 on the water production end side. After the substance such as putty cures, sleeve the fan-shaped unit housing 2-1 and install the glue injection mold 2-3. Place the already made water inlet end fan-shaped unit 2-A upward, hang the membrane filament bundle on the hanging rack, and support the bottom glue injection mold 2-3 and the fan-shaped unit - housing 2-1 with brackets.

[0023] Step 4: Pour the sealing hard glue 3. After waiting for the glue to cure, remove the fan-shaped unit - glue injection mold 2-3. Thus, the water production end fan-shaped unit 2-B is obtained.

[0024] Step 5: Combine 6 water inlet end fan-shaped units 2-A around the water inlet end central tube 6-1 into a whole, and combine the 6 water production end fan-shaped units 2-B at the other end around the water production end central tube 7-1 into a whole to form a bundled fan-shaped unit. Install several bundles of fan-shaped units into the membrane shell 5. Install the water inlet end glue injection mold 6-2 on one side of the fan-shaped unit, and inject the water inlet end sealing glue 6 into it. After curing, inject the membrane filament root protection glue 4. After the membrane filament root protection glue 4 cures, remove the water inlet end glue injection mold 6-2, then pull out the positioning pin 2-2 to leave a water inlet channel, and thus the water inlet end structure is obtained. When water enters, the feed enters the interior of the component through the water inlet channel. Under the action of pressure, it penetrates into the cavity of the hollow fiber membrane filaments and flows towards the water production end in the cavity, and oozes out from the cavity of the membrane filaments at the water production end to obtain the produced water; while the excess inlet water can flow out in a crossflow manner through the central tube at the water production end. It is also possible to install a water production end head 8, the head structure of which is as Figure 8 shown, installed on one side of the water production end, so that the permeate oozing out from the cavity is collected at the permeate side discharge port 8-1 in the head structure and discharged through the permeate side discharge port 8-1 on the head. A pipeline connected to the central tube at the water production end, that is, the rejection side discharge port 8-2, is also provided in the water production end head 8 for discharging the water from the central tube.

[0025] Step 6: Flip the membrane module so that the water production end faces downward and the water inlet end faces upward. Install the water production end glue injection mold 7-2, and inject the water production end sealing glue 7 into the mold. After curing, inject the root protection glue 4 for the membrane filaments. After the root protection glue 4 for the membrane filaments cures, remove the water production end glue injection mold 7-2, and then perform cutting (the cutting position is as shown by the dashed line in the appendix Figure 7 ), exposing the end holes of the hollow fiber membrane filaments 1, thus obtaining the water production end structure.

[0026] In one embodiment, in Step 1, the water production end and the water inlet end are selected and trimmed, and the end holes of the water production end membrane filaments are blocked. In Step 3, there is no need to trim the water production end and block the end holes of the membrane filaments again.

[0027] In one embodiment, the trimming of the water production end of the membrane filament bundle in Step 3 can be carried out on the hanging rack or in any manner that meets the production requirements.

[0028] In one embodiment, the water inlet end glue injection mold 6-2 in Step 5 has holes for glue injection, and is used to install a glue injection pipe for glue injection.

[0029] In one embodiment, in Step 5, drilling is required at a suitable position on the cylindrical surface of the membrane shell 5 for glue injection.

[0030] In one embodiment, the water inlet end glue injection mold 6-2 in Step 5 can be removed in advance after the sealing hard glue 3 cures.

[0031] In one embodiment, the water inlet end glue injection mold 7-2 in Step 6 has holes for glue injection, and is used to install a glue injection pipe for glue injection.

[0032] In one embodiment, in Step 6, drilling is required at a suitable position on the cylindrical surface of the membrane shell 5 for glue injection.

[0033] In one embodiment, the water inlet end glue injection mold 7-2 in Step 6 can be removed in advance after the sealing hard glue 3 cures.

[0034] In one embodiment, the glue injection of the water production end is completed first, and then the glue injection of the water inlet end is completed.

[0035] Based on the above method, the prepared membrane module structure is: A hollow fiber membrane module, comprising: A membrane shell 5 for encapsulating the membrane module Hollow fiber membrane filaments 1, sealed inside the membrane shell 5, with a sealing hard glue 3 filled between the hollow fiber membrane filaments 1 and the membrane shell 5, and the sealing hard glue 3 is located at both ends of the hollow fiber membrane filaments 1.

[0036] Outside the outer part of the junction between the hollow fiber membrane filament 1 and the sealing hard rubber 3 inside the membrane housing 5, there is also a membrane filament root protection rubber 4 wrapped around.

Claims

1. A hollow fiber membrane module structure, characterized in that, It includes a membrane shell, a water inlet end and a water production end, as well as hollow fiber membrane filaments located in the shell; At the water inlet end, a fixing ring formed by splicing a plurality of fan-shaped units is sleeved, and the ends of the hollow fiber membrane filaments are inserted into the fixing ring; The channels at the ends of the hollow fiber membrane filaments are blocked, and a water flow channel communicating with the water production end is left in the middle of the fixing ring formed by the fan-shaped units; At the water production end, a fixing ring formed by splicing a plurality of fan-shaped units is sleeved, and the ends of the hollow fiber membrane filaments are inserted into the fixing ring; the channels at the ends of the hollow fiber membrane filaments are open, and a water flow channel communicating with the water inlet end is left in the middle of the fixing ring formed by the fan-shaped units; For the water inlet end and the water production end, the fan-shaped units are sealed with glue, and there is also glue sealing between the hollow fiber membrane filaments in the fan-shaped units.

2. The hollow fiber membrane module structure according to claim 1, characterized in that, For the water inlet end and the water production end, the glue sealing between the hollow fiber membrane filaments faces the side towards the middle of the membrane shell, and is filled with glue for protecting the roots of the membrane filaments.

3. The hollow fiber membrane module structure according to claim 1, characterized in that, On the water flow channel at the water inlet end, a water inlet end central pipe is connected.

4. The hollow fiber membrane module structure according to claim 1, characterized in that, On the water flow channel at the water production end, a water production end central pipe is connected.

5. The hollow fiber membrane module structure according to claim 1, characterized in that, For the water inlet end and the water production end, the number of fan-shaped units is 2 - 24.

6. The hollow fiber membrane module structure according to claim 1, wherein, In the fan-shaped units at the water inlet end, there are still pipes left between the hollow fiber membrane filament bundles.

7. The hollow fiber membrane module structure according to claim 1, characterized in that, A water production end head is provided at the water production end. On the water production end head, there is a permeate side discharge port communicating with the hollow fiber membrane filament channel and collecting the permeate, and a retentate side discharge port communicating with the water production end central pipe.

8. The manufacturing method of the hollow fiber membrane module according to claim 1, characterized in that, It includes the following steps: S1, insert one end of the hollow fiber membrane filament bundle into the fan-shaped unit, and then insert a placeholder pin into the filament bundle; after installing a glue injection mold on the fan-shaped unit, inject glue between the filament bundles, and after curing, remove the glue injection mold to obtain the fan-shaped unit at the water inlet end; pre-coat the other end of the hollow fiber membrane filament bundle with a plugging substance, then insert it into the fan-shaped unit, and after installing a glue injection mold on the fan-shaped unit, inject glue between the filament bundles, and after curing, remove the glue injection mold to obtain the fan-shaped unit at the water production end; S2, splice the fan-shaped units at the water inlet end to form a fixing ring, splice the fan-shaped units at the water production end to form a fixing ring, and sleeve them between the membrane shells; then respectively install a water inlet end glue injection mold and a water production end glue injection mold on the fixing rings at the water inlet end and the water production end, inject glue into them, and remove the molds after curing; S3, perform a cutting treatment on the water production end to remove the plugging substance; Remove the placeholder pin at the water inlet end to form a pipe.

9. The manufacturing method of the hollow fiber membrane module according to claim 8, characterized in that, It also includes in the step S2, there is also a step of injecting a protective glue for protecting the roots of the membrane filaments into the side of the glue sealing between the hollow fiber membrane filaments at the water inlet end and the water production end facing the middle of the membrane shell; And the glue injection is carried out through the openings on the membrane shell.

Images