JPS6026802Y2 - Ball circulation cleaning device in permeation treatment equipment - Google Patents

Description

[Detailed description of the invention] This invention is a ball circulation system that uniformly distributes cleaning balls to each permeable membrane module for cleaning the membrane surface of the permeable membrane in a permeation treatment apparatus using tube-shaped permeable membrane modules. This invention relates to a cleaning device.

A permeation treatment device that performs pressure treatment on a liquid through a permeation membrane to separate the solvent and solute in the liquid, such as reverse osmosis (rev
osmosis process equipment and ultrafiltration process
Conventionally, in the ess) device, a liquid-permeable cylindrical pressure-resistant support tube such as a glass fiber tube or a metal tube with many liquid sampling holes is housed in the outer cylinder, and the inner wall of this tube is A tubular permeable membrane is attached to the tube, and the pressurized stock solution is passed through the membrane for permeation treatment.The concentrated liquid is collected from the inner end of the tube, and at the same time, the permeated liquid is collected from the outer end of the tube. Tube-shaped permeable membrane modules have been widely used for collection.

This tube-shaped permeable membrane has a simpler structure and pressure resistance compared to other spiral-type or hollow fiber-type ones, and in particular, this tube-shaped membrane has a small inner diameter of the tube on which it is attached. Large (usually around 271 to 1 inch)
Therefore, it is suitable for treating liquids that inherently contain a lot of suspended solids, and it also has the advantage that scale, etc. that adheres to or forms on the membrane surface can be easily removed using a cleaning ball.

For tube-type products, a combination of a mechanical cleaning method using a cleaning ball and a chemical cleaning method is not only more effective, but also has the advantage of reducing the amount of chemicals used.

However, in conventional permeation treatment equipment that uses tube-shaped permeation membrane modules, the permeation membrane modules are usually connected in parallel to a large inlet main tube 2 connected to one end of the stock solution transfer tube 1, as shown in FIG. Main to dozens of branch pipes 3
It has a structure in which a permeable membrane module 4 is connected to the end of each branch pipe 3, and when cleaning the balls,
Normally, a cleaning ball is supplied from this artificial main tube 2 to clean the permeable membrane.

In such a case, it is not easy to evenly distribute the cleaning balls to each of the branch pipes 3 branched in parallel from the thick inlet main pipe 2 at a time.

A large number of cleaning balls may fit into the branch pipe 3 which is easy to enter, and few cleaning balls may enter into the branch pipe 3 which is difficult to enter.

In a permeation treatment device, it is desirable to equalize the number of cleaning balls that pass through the permeation membrane module in order to recover the permeation treatment capacity by cleaning the permeation membrane and to equalize wear of the permeation membrane by the cleaning balls.

Therefore, cleaning is sometimes carried out by artificially supplying a cleaning ball to each permeable membrane module.
This method requires a lot of effort and time.

In addition, in order to automatically distribute cleaning balls to each permeable membrane module, it is necessary to take measures such as installing automatic valves in all branch pipes 3 communicating with the permeable membrane modules and linking them with timers. There is a drawback that the cost of the entire permeation treatment apparatus increases.

Furthermore, in this case, since cleaning is performed for each permeable membrane module, the cleaning time cannot be shortened.

The present invention aims to solve these drawbacks, and the present invention will be explained below with reference to the drawings. Figure 2 shows an example of an implementation device of the present invention, and 5 is the number 1.
This is a 0-tube type permeable membrane module, and as with the conventional structure, a permeable membrane is placed on the inner wall of a liquid-permeable tube housed in an outer cylinder, and one end of the permeable membrane has 6 tubes for each stock solution. , and each concentrate outlet lower at the other end.

The concentrate outlet lower is connected to branch pipes 9 provided at regular intervals to the concentrate outlet main pipe 8.

Further, 10 is a transfer pipe for the cleaning ball 11, one end of which is connected to the exit main pipe 8 for the concentrated solution, and the other end connected to the inlet main pipe 12 for the stock solution.

A transfer pump 13 and a cleaning ball recovery device 14 are provided in the middle of the transfer pipe 10, and the transfer pump 13 and a storage tank 1 for a transfer liquid (for example, permeated liquid) for transferring the cleaning balls 11 are provided.
5 is communicated with through a liquid passage pipe 16 having a valve.

It is preferable that the cleaning ball 11 is made of an elastic body such as a sponge, and has a diameter slightly larger than the diameter of the tubular permeable membrane attached to the inner wall of the tube in the permeable membrane module 5.

The collection device 14 for the cleaning balls 11 is connected to the transfer pipe 10.
A mechanism for discharging the cleaning balls 11 into the transfer liquid flowing therethrough and collecting the cleaning balls 11 in the transfer liquid, for example, a mechanism for discharging the cleaning balls 11 into the transfer liquid flowing therein, for example, a mechanism for discharging the cleaning balls 11 into the transfer liquid flowing therethrough, for example, a mechanism for discharging the cleaning balls 11 into the transfer pipe 10 and discharging the recovery device 14 that communicates with the transfer pipe 10.
A structure may be adopted in which a net device (not shown) that does not allow the passage of 1 is provided so as to be openable and closable.

One end of the transfer pipe 10 provided with the transfer pump 13 and the recovery device 14 for the cleaning balls 11 is connected to the inlet main pipe 12 for the stock solution as described above, and this artificial main pipe 12 is further connected to the distribution chamber. It connects to the entrance of 17.

This distribution chamber 17 has a conical shape, and has a disc-shaped distribution plate 18 on the outlet side as shown in FIGS. 3 and 4, and a permeable membrane module 5 The branch pipes 19 communicating with the stock solution population 6 are opened in a single concentric circle at equal intervals.

Next, to explain the operation in the embodiment of the present invention, during permeation treatment, when the stock solution is supplied from the inlet main pipe 12, the stock solution flows into the distribution chamber 17 and is passed through the branch pipes 19 from each opening of the distribution plate 18. After passing through the permeable membrane module 5 from the raw solution 6, it is permeated, the permeated liquid is discharged from a predetermined part of the outer cylinder of the permeable membrane module 5, and the concentrated liquid is passed from the concentrated liquid output lower to the outlet through the branch pipe 9. It is discharged from the main pipe 8 to a predetermined location.

If scale or the like is generated on the membrane surface of the permeable membrane module 5 by performing the permeation treatment of this stock solution, the permeation treatment operation is stopped and the membrane surface is cleaned by the ball circulation cleaning device according to the present invention.

That is, open the valve of the liquid passage pipe 16 communicating with the storage tank 15,
When the transfer pump 13 is started, the transfer liquid enters the transfer pipe 10 from the storage tank 15, flows from the collector 14 through the transfer pipe 10 and the inlet main pipe 12 into the distribution chamber 17, and flows from the opening of the distribution plate 18 into the branch pipe 19. After forming a circulation flow path in which the concentrate is supplied from the concentrate 6 to the permeable membrane module 5, and returns to the transfer pipe 10 via the branch pipe 9 and the outlet main pipe 8 from the concentrate outlet lower, the valve of the liquid passage pipe 16 is closed. to stop the transfer liquid supply.

In this case, a chemical for removing scale can be added to the transfer liquid as needed, or chemical cleaning can be performed after the ball cleaning operation.

Next, when the ball discharge port of the recovery device 14 is opened and the cleaning balls 11 are discharged into the circulating transfer liquid, the discharged group of cleaning balls 11 is accompanied by the circulating transfer liquid and flows into the transfer pipe 10.
After passing through the inlet main pipe 12 and entering the distribution chamber 17, the cleaning balls are dispersed in multiple directions, and after hitting the distribution plate 18, or directly flowing into each branch pipe 19 from the opening, an approximately equal number of cleaning balls are distributed. 11 is distributed from the stock solution population 6 to the inside of each permeable membrane module 5 from the stock solution population 6.

Then, while removing scale etc. from the membrane surface inside the permeable membrane module 5, the concentrated liquid flows from the lower of the permeable membrane module 5 through the branch pipe 9 and the outlet main pipe 8 into the transfer pipe 10, and the same process as described above is carried out. After repeating the circulation cleaning several times, only the cleaning balls 11 are collected into the collection device 14.

Thereafter, for example, the valve of the drain pipe 20 provided in the transfer pipe 10 upstream of the transfer pump 13 is opened to discharge the transferred waste liquid containing floating scales to the outside of the system.

Next, the valve of the liquid drain pipe 20 is closed, and the valve of the liquid passage pipe 16 communicating with the storage tank 15 is opened, and a new transfer liquid is supplied from the storage tank 15 to the transfer pipe 10 to clean the inside of the permeable membrane module 5.
The valve of the drain pipe 20 is opened to drain the cleaning waste liquid.

Then, all the valves in the transfer pipe 10 system are closed, and the operation of the transfer pump 13 is stopped to complete the ball cleaning operation.

In this ball cleaning operation, the cleaning balls 11 are not continuously circulated, but are collected into the collector 14 after each circulation, and are then intermittently discharged into the transfer liquid in the transfer pipe 10. It may also be circulated.

In this case, the circulating transfer liquid may be replaced appropriately,
For example, after performing the ball cleaning operation several times, the cleaning balls 11 are collected in the recovery device 14 and transferred from the transfer pipe 10 to the drain pipe 2.
Only the transferred waste liquid containing floating scale is discharged through the 0 valve.

Next, after closing the valve of the liquid drain pipe 20, the valve of the liquid passage pipe 16 communicating with the storage tank 15 is opened, and a new transfer liquid is supplied from the storage tank 15 to the transfer pipe 10, and a new liquid is circulated from the collector 14. The cleaning ball 11 is discharged into the transfer liquid, and the cleaning ball operation is repeated.

After the scale and the like on the permeable membrane surface in the permeable membrane module 5 is removed, the operation of the transfer pump 13 is stopped and the ball cleaning operation is completed.

Further, the recovery device 14 for the cleaning balls 11 in the embodiment of the present invention is not necessarily necessary, and for example, the cleaning balls 11 are supplied from the storage tank 15 to the transfer pipe 10 together with the transfer liquid, and the ball cleaning 11 is circulated to clean the balls. It is also possible to take measures such as carrying out the operation and recovering the cleaning ball 11 from the drain pipe 20 of the transfer pipe 10 after the completion of the cleaning operation.

In this example, the permeable membrane module and the transfer tube are connected to each other by connecting both ends of the transfer tube to the inlet main tube for the stock solution and the outlet main tube for the concentrated liquid. However, in other embodiments, there is a structure in which both ends of the transfer tube are directly connected to the inlet side of the distribution chamber and the concentrate outlet of the permeable membrane module. In this case, if the inlet main pipe for the concentrate and the outlet main pipe for the concentrated liquid are connected to appropriate locations of the transfer pipe so that a part of the transfer pipe also serves as the main pipe, the structure is substantially the same as that of the previous embodiment.

In addition, the cleaning ball circulation path configured by the cleaning ball transfer pipe, distribution chamber, and transfer pump in the present invention is an inlet main pipe used for supplying the raw solution to the permeation membrane module and discharging the concentrated solution during permeation treatment. , it can also be used as a permeation treatment path constituted by an outlet main pipe, a stock solution transfer pipe, and a stock solution transfer pump provided in this stock solution transfer pipe.

Also, unlike the structure of these embodiments, both ends of the transfer tube are connected to the inlet side of the distribution chamber and the concentrate outlet of the permeable membrane module, and the inlet main tube for the stock solution is connected separately from the transfer tube. A structure that communicates with the concentrate outlet main pipe is also considered, but
It is difficult to produce and has no special benefits.

As explained above, according to the present invention, openings are provided at regular intervals in the distribution plate in which the cleaning balls entrained in the transfer liquid circulating between the permeation treatment device and the ball circulation cleaning device are dispersed in the distribution chamber. Since the inflow can be made evenly from the inlet of the permeable membrane module, there is no one-sided flow of the cleaning balls that occurs when cleaning the balls by flowing the cleaning balls only from one end of the inlet main tube, as in the conventional case. Therefore, the permeable membrane balls of each permeable membrane module can be cleaned smoothly and effectively.

Furthermore, a collection device for cleaning balls is installed in the middle of the transfer pipe, and each time the cleaning balls accompanying the transferred liquid pass through the permeation treatment device once, only the cleaning balls are collected in the recovery device, and the cleaning balls are collected into the recovery device, and the transferred liquid is circulated again. If the water is discharged at once, the distribution of the cleaning balls will be more even.

In addition, as a result of effectively cleaning the permeation membranes of all modules, the permeation performance of all the permeation membranes is equally restored to the same level, so the treatment efficiency of the permeation treatment device can be increased. It also equalizes the abrasion of the permeable membrane surface inside the module due to ball cleaning.
This prevents only a specific permeable membrane module from being over-cleaned and requiring replacement earlier.

In addition, according to the present invention, the permeable membrane balls of each module can be cleaned by the simple means described above, so there is no need to pass the cleaning balls through each module one by one as in the conventional method. Since there are no holes, it does not take much effort or time to clean the ball.

Also, in terms of equipment cost, the present invention has a simple structure, so
The cost is not increased compared to the case where the distributing operation of the cleaning balls is automated and carried out through each cleaning ball one by one for each module.

Examples of the present invention will be described below.

Example As a result of performing ball cleaning treatment under the following conditions using the ball circulation cleaning device shown in Figures 2 and 3, the average distribution ratio of cleaning balls entering each permeable membrane module is shown in Table 1 below. The ratio remained almost constant.

Cleaning balls: 54 sponge balls with a diameter of 26 rrrjn are used Distribution chamber: Volume 0.0056 d, distribution plate area 0.1147
Il permeable membrane module: 25y++m (inner diameter), 5
2 m, (total length), 18 pipes were used.Transfer fluid circulation flow rate: 5.2 i/hr.Number of circulation: 10 times.Next, the conventional structure of the stock solution transfer pipe and inlet main pipe shown in Fig. 1 were used as they were, and the ball cleaning was carried out. As a result of the continuous ball cleaning operation, the average distribution ratio of the cleaning balls entering each permeable membrane module was non-uniform and always varied as shown in Table 2.

(Note that the other conditions in this example are the same as in the above-mentioned example of the present invention.

)

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of the cleaning ball distribution mechanism in a conventional ball circulation cleaning device without a distribution chamber, and Fig. 2 is an example of a permeation treatment device using the ball circulation cleaning device of the present invention with a distribution chamber. 3 is a plan view showing the distribution plate portion of the distribution chamber used in the embodiment of the present invention, and FIG. 4 is a cross section of the distribution chamber taken along line AA' in FIG. 3. It is a diagram. 1... Stock solution transfer pipe, 2... Inlet main pipe,
3... Branch pipe, 4... Permeable membrane module, 5... Permeable membrane module, 6... Stock solution inlet, 7... Concentration Liquid outlet, 8... Outlet main pipe, 9... Branch pipe, 10... Transfer pipe, 11... Washing ball, 12...・Inlet main pipe, 13...Transfer pump, 14...
Recovery device, 15...Storage tank, 16...Liquid passage pipe, 17...Distribution chamber, 18...Distribution plate, 19... Branch pipe, 20...Drainage pipe.

Claims (1)

[Scope of utility model registration request] The stock solution is supplied from the inlet main pipe side that communicates with the stock solution inlet of a large number of tube-type permeable membrane modules in which permeable membranes are attached to the inner walls of tubes that allow liquid to pass through and are housed in outer cylinders, and the exit main pipe that communicates with the concentrate outlet. In a permeation treatment device that discharges the concentrate from the side, one end of the transfer pipe of the cleaning ball via a transfer pump is communicated with the outlet main pipe of the concentrate, and the other end of the transfer pipe is communicated with the inlet main pipe, At the communication point between the inlet main pipe and each stock solution inlet of the permeable membrane module, a disc-shaped disc-shaped plate is provided with a plurality of openings communicating with the distribution chamber and each stock solution inlet in a single concentric circle on the plate surface at intervals. A ball circulation cleaning device for a permeation treatment device, characterized in that it is equipped with a circular disk-shaped distributor made of a distribution plate.