JPS618192A - Water treating apparatus - Google Patents

Abstract

PURPOSE:To reduce required space while enlarging filtering area, by horizontally placing pipe shaped porous filters each opened at both ends thereof and providing a bubbling nozzle below said filters. CONSTITUTION:A filter unit 16 formed by horizontally placing pipe shaped filters comprising a porous material and opened at both ends thereof and combining said filters with hollow bodies 17 is arranged in the lower chamber 1b of a container and a bubbling nozzle 20 for generating air bubbles for cleaning the filters is provided at the position below the filter unit 16. Water to be treated supplied to the lower chamber 11b is filtered by the filters 18 while the filtered water is discharged through an upper chamber 11a and the filters are cleaned by air bubbles. Therefore, a large filtering area is obtained in a small space and waste is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a water treatment device, and particularly to a water treatment device suitable for use as a filtration device for a condensate system and a reactor feed water system in a nuclear power plant.

[Technical background of the invention and its problems]

Generally, in nuclear power plants, precision filtration devices using filter aids such as ion exchange resins are used as filtration devices for condensate systems and reactor water supply systems.

FIG. 3 shows a conventional water treatment device of this type, in which water to be treated is led from a water inlet 2 provided in a container 1 to an upper chamber 1a of the container, and is arranged in the upper chamber 1a of the container. After being filtered through an element 3 having a filtration medium, the water is introduced into the lower chamber 1b of the container and discharged from a water outlet 4.

In addition, when the filtration process progresses to a certain extent and the solid content captured in the filter aid and element 3 increases, a pressure difference will be generated between the water inlet 2 and the water outlet 4. When the specified value is reached, backwashing is performed.

In this backwashing, air is sent through the backwash air pipe 5 provided in the lower chamber 1b of the container to cause the filter aid and solids adhering to the element 3 to fall to the bottom of the upper chamber 1a of the container, and the waste liquid is discharged from the water inlet 2.
This is carried out by discharging air from the vent pipe 6 provided at the top of the upper chamber 1a of the container.

In the conventional water treatment apparatus having the above configuration, since it is necessary to use a filter aid such as an ion exchange resin, a large amount of filter aid waste is generated, which has the drawback of increasing radioactive waste.

Furthermore, since the filtration area is small, there is also the drawback that it is necessary to install a plurality of large-sized water treatment devices in order to treat a reactor secondary system with a large flow rate.

(Objective of the Invention) The present invention was made in view of the current situation, and it is possible to increase the filtration area and reduce the required space, and also to minimize the amount of waste generated during water treatment. The purpose is to provide water treatment equipment.

[Summary of the invention]

The present invention uses a pipe-shaped filter made of a porous material with at least one open end, thereby eliminating the need for conventional filter aids and reducing waste. In addition, the filter can be placed horizontally to increase or decrease the filtration area relatively easily, and a bubbling nozzle that generates cleaning bubbles is installed below the filter to make it easier to clean the filter. It is characterized by this.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, numeral 11 is a container, and inside this container 11,
As shown in FIG. 1, the container upper chamber 11a is
and a container lower chamber 11b.

As shown in FIGS. 1 and 2, the container lower chamber 11b has two water inlet pipes 13 radially opposed to each other at two locations on the circumferential surface.
However, a cleaning waste liquid outlet pipe 14 is also connected to the bottom. At the discharge end of each water inlet pipe 13, a second
As shown in the figure, rectifying plates 15 are arranged respectively.

Further, a filter unit 16 is disposed in the lower chamber 11b of the container as shown in FIGS. 1 and 2, and the furnace liquid filtered by this filter unit 16 is introduced into the upper chamber 11a of the container. It's starting to peel off.

As shown in FIGS. 1 and 2, the filter unit 16 includes a pair of hollow bodies 1 having a semicircular shape and facing each other in the radial direction.
7 and a large number of horizontally placed hollow filters 18, each hollow filter 18 is formed of a porous resin such as polyethylene into a small diameter pipe shape with both ends open. They are connected to the body 17, respectively.

The upper end of each hollow body 17 is connected to the upper chamber 11a of the container via a connecting pipe 19, as shown in FIG. It has become.

As shown in FIG. 1, a bubbling nozzle 20 for generating air bubbles during filter cleaning is provided at a lower position of the filter unit 16 configured in this manner.

On the other hand, in the upper chamber 11a of the container, as shown in FIG. 1, there are a furnace liquid outlet pipe 21 for discharging the liquid filtered by the filter unit 16, a vent nozzle 22 used for cleaning the filter, and a backwash air nozzle 23. are provided for each.

Next, the operation of this embodiment will be explained.

Water to be treated is taken in through two water inlet pipes 13 provided in the lower chamber 11b of the container 11, as shown in FIG. and guided to the filter unit 16.

The water to be treated that has been led to the filter unit 16 is filtered while passing through a large number of horizontally placed hollow filters 18 from the outer surface toward the axis, and the filtered liquid is filtered on both sides of the hollow filter 18. It is led to the container upper chamber 11a via the hollow body 17 and the connecting pipe 19. Then, the furnace liquid is discharged to the outside from the furnace liquid outlet pipe 21 provided in the upper chamber 11a of the container.

When the filtration process progresses to a certain extent and solids are captured on the outer circumferential surface of the hollow filter 18, the filtration flow rate in the hollow filter 18 decreases and the solid content is trapped between the water inlet pipe 13 and the furnace liquid outlet pipe 21. Differential pressure occurs. Therefore, when this differential pressure reaches a specified value, the hollow system filter 18 is cleaned.

In this cleaning, first, the inside of the container 11 is filled with water, and pressurized air is sent to the bubbling nozzle 20 directly below the filter unit 16 to generate bubbles.

These bubbles cause the solid matter adhering to the outer peripheral surface of the hollow filter 18 to fall to the bottom of the lower chamber 11b of the container. At the same time or after phase #i, the container upper chamber 11a
Pressurized air is supplied to the upper chamber 1 of the container from the backwash air nozzle 23 provided in the
1a. As a result, the axial center side of the hollow filter 18 becomes higher in pressure than the outer surface side, and water passes from the inside of the hollow filter 18 toward the outer peripheral surface side, thereby backwashing the hollow filter 18. .

The cleaning waste liquid thus obtained is discharged to the outside from a cleaning waste liquid outlet pipe 14 provided in the lower chamber 11b of the container, and water and air are removed from the vent nozzle 22.

Since a large number of hollow filters 18 are used, a large filtration area can be obtained with a small space.
Since a filter aid such as an ion exchange resin is not required, the volume of waste liquid can be reduced.

In addition, since the hollow filter 18 is placed horizontally,
By adjusting the number of hollow filters 18 stacked in the vertical direction, the filtration area can be increased or decreased relatively easily.

In the above embodiment, the hollow filter 18 has a cylindrical shape with both ends open, and both ends are connected to the hollow body 17. However, the hollow filter 18
If the length of the hollow filter 1 is not very long,
8 may have a cylindrical shape with one end closed, and only one open end may be connected to the hollow body 17.

〔Effect of the invention〕

As explained above, the present invention has a lower chamber to which treated water is supplied, an upper chamber isolated from the lower chamber, and a plurality of pipes arranged horizontally in the lower chamber, each made of a porous material and shaped like a pipe with at least one end open. , a closed container whose upper end communicates with the upper chamber to which the open portion of each filter is connected, and a bubbling nozzle disposed below the filter to generate air bubbles to supply air to the lower chamber. The treated water is filtered through a filter, and the filtered water is discharged through a closed container and upper chamber, and the filter is washed with air bubbles from a bubbling nozzle, so a large filtration area can be achieved in a small space. In addition, since no filter aid is required, waste can be reduced, and the filter can be easily and quickly cleaned.

[Brief Description of the Drawings] Figure 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a vertical cross-sectional view showing a conventional water treatment device. be. 11... Container, 11a... Upper chamber of container, 11b...
Container lower chamber, 13...Water inlet pipe, 14...Washing waste liquid inlet/outlet pipe, 16...Filter unit, 17...Hollow body, 18...Hollow system filter, 19...Connection pipe,
20... Bubbling nozzle, 21... Furnace liquid outlet pipe, 22... Vent nozzle, 23... Backwash air nozzle. 5 applicants: Kiyota Inomata 2 times

Claims (1)

[Claims] 1. A lower chamber to which treated water is supplied, an upper chamber isolated from the lower chamber, and a plurality of pipes arranged horizontally in the lower chamber, each made of a porous material and shaped like a pipe with at least one end open. A water treatment device comprising a formed filter, an airtight container whose upper end communicates with the upper chamber to which the open portion of each filter is connected, and a bubbling nozzle disposed below the filter to generate air bubbles. 2. The water treatment device according to claim 1, wherein the filtration area can be adjusted by adjusting the number of filters stacked in the vertical direction.