JPS61171502A - Hollow yarn membrane module - Google Patents

Abstract

PURPOSE:To dispense with a separate protective container for bringing a membrane surface to a wet state, by supporting hollow yarn membranes opened at the upper ends thereof and closed at the lower ends thereof by an upper tube plate and a lower tube plate to constitute a both-end support structure and connecting both tube plates by a sleeve. CONSTITUTION:The upper ends of hollow yarn membranes 11 are fixed to an upper tube plate 14 in an opened state while the lower ends thereof are fixed to a lower tube plate 9 to be closed and both tube plates 14, 19 are connected by the sleeve 12 for surrounding the hollow yarn membranes 11. A large number of piercing holes 19a for guiding a liquid to be treated and a scrubbing medium to the hollow yarn membranes are provided to the lower tube plate 19 and a plurality of air vent holes 12 are provided to the upper part of the sleeve 12 while a plurality of ports 12C coming to backwashing discharge ports are provided to the lower part of said sleeve. By this constitution, transport becomes easy as a module single product and the deterioration of the hollow yarn membranes is easily prevented by bringing said membranes to a wet state by sealing a liquid therein.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a hollow fiber membrane module with a specification for filtering from the outside of the hollow fiber membrane to the inside, and in particular, the present invention relates to a hollow fiber membrane module that is designed to filter from the outside to the inside of the hollow fiber membrane. The present invention relates to a hollow fiber membrane module suitable for use in a hollow fiber membrane filter device.

[Prior Art] Fig. 1 shows an example of a filter system using an external pressure type hollow fiber membrane filter device. and sent to the hollow fiber membrane filter device 4. The liquid to be treated supplied into the apparatus 4 is filtered by a plurality of hollow fiber membrane modules 5 each consisting of a large number of hollow fiber membranes as it passes from the outside to the inside of the hollow fiber membranes. The filtered and treated liquid exits to the top of the device 4 and is sent out through the pipe 8, and the separated impurities are sent to the tank 7.

In order to prevent clogging of the module 5, backwashing is performed at appropriate intervals. For this backwashing, water for backwashing from the vibrator 9 or air for backwashing from the pipe 10 is sent to the upper part of the device 4, and each hollow fiber membrane of the module 5 is washed from the inside to the outside. Backwash after dome drain from Vibe 11). Thereafter, water and air for scrubbing are sprayed from the water sprinkler 6 toward each module 5 to wash away impurities adhering to the surface of the hollow fiber membranes of the modules 5. Water used for washing is collected in tank 7.

Water and air for scrubbing are supplied from the vibrator 9 and the vibrator 10. The vibrator 12 is for venting.

By the way, in the above-mentioned filter system, conventionally the second
The hollow fiber membrane filter device shown in the figure was used. A sleeve 12 for preventing entanglement of the hollow fiber membranes 11 of each module 5 is fixed by welding to a tube plate 13 of the device body, and the tube plate 14 fixes and supports the upper end of the hollow fiber membrane bundle 11.
The O-ring 15 is inserted into the opening made in the tube plate 13 of the main body of the device.
The tube plate 13 of the apparatus main body is inserted into the tube plate 13, and the upper surface of the tube plate 13 is sealed with a gasket 16, held down with a holding plate 17, and fixed with stud bolts 18. The upper end of the hollow fiber membrane 11 is open, and the lower end is closed with an adhesive or the like.

Although not shown, it is also known that the hollow fiber membrane bundle is bent into a U-shape and both ends of the hollow fiber membrane bundle are fixed to a tube plate, but in either case, the hollow fiber membranes are supported in a cantilevered manner. The structure was attached to the tube sheet.

However, such a structure causes the following problems.

The sleeve 12 for preventing the hollow fiber membranes 11 of each module 5 from becoming entangled is the tube plate 12 of the hollow fiber membrane filter device main body.
It is fixed by welding to the membrane surface, so a separate protective container is required to protect the membrane surface and keep it moist. Furthermore, when a hollow fiber membrane is attached to a tube plate, stress is likely to be applied to the root portion, and a cantilevered structure is extremely disadvantageous.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to protect the membrane surface and keep the membrane surface in a wet state. To provide a hollow fiber membrane module 1 that does not require a separate protective container and has a structure in which the hollow fiber membranes are supported at both ends, which is advantageous in terms of strength compared to a cantilever structure. .

[Kth Means for Solving the Problem] In order to solve the above-mentioned problem, according to the present invention, in a hollow fiber membrane module designed to filter from the outside to the inside of the hollow fiber membrane, the upper end of each hollow fiber membrane of the module is provided. is opened, the lower end is closed, and the upper and lower ends of each hollow fiber membrane are fixed with an upper tube sheet and a lower tube sheet, respectively, and both tube sheets are connected by a sleeve surrounding the hollow fiber membrane bundle, and the lower tube is closed. Forming through holes in the plate and sleeve. Also, in practicing the invention, the sleeve extends below the lower tube plate.

[Operations and Effects of the Invention] As described above, in the present invention, the hollow fiber membrane bundle is surrounded by a sleeve, and the sleeve is not temporarily fixed to the tube of the hollow fiber membrane filter device main body as in the conventional case, but the hollow fiber membrane bundle is surrounded by a sleeve. Since it is connected to the tube plate that fixes and supports the thread membrane, it is easy to transport as a single module, and at the same time,
It becomes easy to seal the liquid inside and keep the hollow fiber membrane in a wet state to prevent its deterioration. In order to secure the flow path, through-holes are required in the lower tube plate and sleeve that fix the hollow fiber membrane, but these through-holes can be closed with caps, tape, etc. during transportation or storage, so there is no need to worry much. Must not be.

Furthermore, since the hollow fiber membrane is supported at both ends by the upper tube sheet and the lower tube sheet, the strength is increased compared to the conventional cantilever structure in which the hollow fiber membrane is supported only by the upper tube sheet.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 3 and 4. Note that the same parts as in FIG. 2 are designated by the same reference numerals and their explanations will be omitted.

The upper end of each hollow fiber 1!111 is fixed to the upper tube plate 14 as in the conventional one, and the lower end is fixed to the lower tube plate 19. The upper end of each hollow fiber membrane 11 is open as in the conventional membrane, and the lower end is closed with an adhesive or the like. The upper tube sheet 14 and the lower tube sheet 19 are connected by a sleeve 12 surrounding the hollow fiber membrane bundle 11. In the illustrated embodiment, the sleeve 12 extends below the lower tube plate 19 and includes a protrusion 12a.

A through hole is formed in the lower tube plate 19 and the sleeve 12 to ensure a flow path. The lower tube plate 19 is provided with a plurality of through holes 19a for guiding the liquid to be treated and the scrubbing medium (water and air) to each hollow fiber membrane 11, and the upper part of the sleeve 12 is provided with an air escape hole. A plurality of holes 12b are provided in the lower portion, and a plurality of holes 12G are provided in the lower portion to serve as backwash discharge ports. Also, in Figure 4, 2
0 indicates a through hole, and part A indicates the effective filling range of the hollow fiber membrane.

FIGS. 5 and 6 show a hollow fiber membrane filter device assembled using the hollow fiber membrane modules described above, in which a large number of modules 5 are housed in a casing 21 that is divided into upper and lower parts. In Fig. 5, 22 is a backwash register outlet, 23 is a treated liquid inlet, 24 is a treated liquid outlet, 25 is a vent, 2
6 indicates the dome drain, 27 indicates the air inlet, and 28 indicates the scrubbing water outlet and fuselage vent.

FIG. 7 shows the details of the distribution device 6 for the liquid to be treated and the scrubbing medium, in which a distribution pipe 30 with a closed tip is connected to the Hözda pipe 29, and each distribution pipe 30 is positioned directly below each module 5. There are as many upward jet nozzles 31 as there are modules 5.

At this time, as described above, the sleeve 12 is extended below the lower tube plate 19 to form the protrusion 12a, and the protrusion 12a is used as a guide channel for the liquid to be treated or the scrubbing medium. Alternatively, the scrubbing medium can be reliably sent to each module 5.

[Brief explanation of the drawing]

Fig. 1 is a piping diagram showing an example of an external pressure type hollow fiber membrane filter system, Fig. 2 is a longitudinal sectional view showing a part of a conventional hollow fiber membrane module in plan, and Figs. 3 and 4 are the invention of the present invention. FIG. 3 is a partially planar vertical sectional view, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 4t Iya□7 (Az
9 H□Eh. , □51 is a partially cutaway front view, FIG. 6 is a cross-sectional view of FIG. 5, and FIG. 7 is a plan view of the distribution device. 5...Hollow fiber membrane module 6...Distribution device
11...Hollow fiber membrane 12...Sleeve 13.
... Tube sheet of the device 14 ... Upper tube sheet of the hollow thread membrane bundle 15 ... ○ ring 16 ... Gasket 17
...Press plate 18...Bolt 19...Lower tube plate of hollow fiber membrane bundle Figure 5

Claims (2)

[Claims] (1) In a hollow fiber membrane module designed to filter from the outside to the inside of the hollow fiber membrane, the upper end of each hollow fiber membrane of the module is open, the lower end is closed, and the upper and lower ends of each hollow fiber membrane are connected to the upper end. fixed by a tube sheet and a lower tube sheet, and both tube sheets are joined by a sleeve surrounding the hollow fiber membrane bundle;
A hollow fiber membrane module characterized in that a through hole is formed in the lower tube plate and the sleeve. (2) The hollow fiber membrane module according to claim 1, wherein the sleeve extends below the lower tube plate.