JPH0416243A - Apparatus for separating ion exchange resin - Google Patents

Abstract

PURPOSE:To automatically separate resins by providing an interface detector having a plurality of color discriminating sensors each provided with a light emitting part and a light detecting part arranged thereto to detect the separation interface of resin beds and controlling the flow rate of the resin beds by a controller to allow the separation interface to coincide with the opening surface of a resin transfer pipe. CONSTITUTION:Backwashing water is introduced into the lower part of a separation tower 1 packed with a resin mixture of a cation exchange resin and an anion exchange resin from a water supply pipe 7 to perform the backwashing separation of the resins, and backwashing waste water is discharged from the upper part of the separation tower 1 by a drain pipe 9. Further, the separated anion exchange resin is discharged from the resin transfer pipe 12 opened to an ionizing tower 1. Furthermore, an interface detector 20, having a plurality of color discriminating sensors 26 having light emitting parts 23 emitting lights to resin beds 3-5 and light detecting parts 25 detecting reflected lights arranged thereto to the vertical direction, in the vicinity of the separation interface of the resin beds, is provided. A controller 30 controls a flow control valve 6 on the basis of the detection signal of the interface detector 20 so as to allow the separation interface of the resin beds to coincide with the opening surface of the resin transfer pipe 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ion exchange resin separation device, and more specifically, to a mixed resin of a cation exchange resin and an anion exchange resin used in a hotbed type ion exchange device, etc. This invention relates to a separation device for separation.

[Conventional technology]

A separation tower filled with a mixed resin of a cation exchange resin and an anion exchange resin, a water supply pipe that introduces backwash water into the lower part of this separation tower, a flow rate control valve provided in this water supply pipe;
A drainage pipe for discharging backwash wastewater from the upper part of the separation tower and a resin transfer pipe opening into the separation tower to discharge the separated anion exchange resin are provided, and backwash water is introduced from the water supply pipe. , Water is passed through the resin layer in an upward flow to perform backwash separation of the resin, and the separation interface of the resin layer is aligned with the opening surface of the resin transfer tube, so that the anion exchange resin is transferred from the resin transfer tube. A separation device for ion exchange resin has been proposed.

However, with such conventional equipment, it is necessary to open and close the flow control valve to control the amount of backwash water while visually checking the separation interface of the resin layer, which requires one person and cannot be automated. There is a problem that confirmation is likely to be inaccurate.

On the other hand, as a device for detecting the separation interface of the resin layer, a color discrimination sensor consisting of a light emitter that emits light onto the resin layer and a light receiver that receives reflected light is installed in a viewing window provided near the separation interface of the resin layer. A device has been proposed that detects the separation interface by moving it vertically along the separation interface.

However, in such a separation interface detection device for a resin layer, the separation interface is detected by moving the color discrimination sensor up and down, so the mechanism and operation are complicated, and it is prone to failure.
Since detection cannot be performed unless the color discrimination sensor makes one round trip, it takes time to obtain accurate results. Therefore, when trying to use this detection device to detect the separation interface of the resin layer of the separation device and control the flow rate control valve based on the result, it is necessary to align the separation interface of the resin layer with the opening surface of the resin transfer pipe. The problem is that it takes a long time.

[Problems to be Solved by the Invention] In order to solve the above-mentioned problems, an object of the present invention is to accurately and quickly detect the separation interface of the resin layer without manual intervention, and to connect the separation interface to the opening of the resin transfer pipe. An object of the present invention is to provide an ion exchange resin separation device that can match the surface of the ion exchange resin and automate the resin separation operation.

[Means to solve the problem]

The present invention provides a separation tower filled with a mixed resin of a cation exchange resin and an anion exchange resin, a water supply pipe for introducing backwash water into the lower part of the separation tower to perform backwash separation of the resin, and a water supply pipe for the water supply pipe. A flow control valve provided, a drain pipe for discharging backwash wastewater from the upper part of the separation tower, a resin transfer pipe opening into the separation tower to discharge the separated anion exchange resin, and light emitted onto the resin layer. An interface detector is arranged vertically near the separation interface of the resin layer, and a plurality of color discrimination sensors each having a light emitting part and a light receiving part to receive the reflected light, and a detection signal from this interface detector separates the resin layer. The present invention is an ion exchange resin separation device comprising: a controller that controls the flow rate regulating valve so that the interface coincides with the opening surface of the resin transfer pipe.

The separation column in the present invention is a column for performing separation by filling a mixed resin of a cation exchange resin and an anion exchange resin, and when performing separation and regeneration using an ion exchange column, the ion exchange column serves as a separation column. In addition, when the mixed resin is taken out to a regeneration tower (cation exchange resin regeneration tower) separate from the ion exchange tower for separation and regeneration, this regeneration tower becomes a separation tower, and a separate tower from these is used for separation. It can also be used as a tower.

The separation tower is provided with a water supply pipe having a flow rate control valve at the bottom, a drain pipe at the top, and a resin transfer pipe opening into the resin layer. The separation tower is provided with an interface detector in which a plurality of color discrimination sensors having a light projecting part and a light receiving part are arranged near the separation interface of the resin layer. The color discrimination sensor discriminates the color of the cation exchange resin (brown) and the color of the anion exchange resin (yellow) according to the amount of reflected light, and the interface detector integrates the discrimination results of each color discrimination sensor and detects one separated interface. configured to detect. A controller is provided to open and close the flow control valve based on the detection signal from the interface detector.

[For production]

In the ion exchange resin separation apparatus of the present invention.

With a mixed resin of cation exchange resin and anion exchange resin filled in a separation tower, backwash water is introduced from the water supply pipe and passed through the resin layer in an upward flow, and the resin layer is backwashed and developed. Cation exchange resin and anion exchange resin are separated based on the difference in specific gravity.

At this time, light is projected onto the resin layer from each light projecting section provided in each color discrimination sensor of the interface detector, and one reflected light is received by the light receiving section.
The color of the portion where each color discrimination sensor is provided is discriminated. Then, based on the discrimination results of each color discrimination sensor, the interface detector detects the separation interface of the resin layer and inputs it to the controller. Using the opening surface of the resin transfer pipe as a reference surface, the controller throttles the flow rate control valve when the separation interface is higher than the reference surface, and opens it when it is lower, so that the one separation interface coincides with the reference surface.

When the separation interface coincides with the reference plane, the valve of the resin transfer pipe is opened, and the anion exchange resin above the separation interface is taken out from the resin transfer pipe.

At this time, in order to completely separate the cation exchange resin layer and anion exchange resin layer, an inert resin having an intermediate specific gravity is used in combination, and an inert resin layer is formed between the cation exchange resin layer and anion exchange resin layer by separation. can be formed.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments of the drawings.

Figures 1 (a) to (d) are system diagrams showing the operating state of the separation device of the example, Figures 2 (a) to (C) are operation explanatory diagrams, and Figure 3.
The figure is a front view of the interface detector, and FIG. 4 is its AA sectional view.

In the figure, 1 is a separation column, and a mixed resin of a cation exchange resin and an anion exchange resin is filled on a support plate 2 through which water can flow to form a mixed resin layer 3, and the cation exchange resin layer 3 is formed by backwash separation. 4 and an anion exchange resin layer 5.

A water supply pipe 7 having a flow control valve 6 is connected to the lower part of the separation tower 1, and a drain pipe 9 having an on-off valve 8 is connected to the upper part.
A water collection pipe 10 is arranged within the separation column 1. A resin transfer pipe 12 having an on-off valve 11 is connected to the middle part of the separation column 1, and the opening surface of the collector 13 is connected to the separation interface 14 between the resin layers 4 and 5.
It is located nearby.

A viewing window 15 provided at a position corresponding to the separation interface 14 on the side wall of the separation tower 1 has a frame 17 that holds a translucent window glass 16 fixed with bolts 18, and the window glass 16
An interface detector 20 is attached so as to cover the other parts, leaving a visual gap 19.

The interface detector 20 includes a mirror 21 . Light projecting unit 23 that projects incident light 22 onto the resin layer 3.4.5 through the window glass 16
and reflected light 24. from the resin layers 3, 4.5 through the window glass 16. A plurality of color discrimination sensors 26 each consisting of a combination of light receiving sections 25 that receive light are arranged in the vertical direction near the separation interface 14 and attached to the substrate 27.

Further, a light emitting diode 28 serving as one display section is attached to the substrate 27 corresponding to the light projecting section 23 and the light receiving section 25, and is disposed opposite to the display board 29. The substrate 27 determines the color of the resin layer 3.4.5 from the reflected light 24 received by the light receiving section 25, and displays the determined color on one light emitting diode 28. The light emitting diode 28 is R, G
, B, the mixed resin layer 3, cation exchange resin layer 4, anion exchange resin layer 5, and water layer are displayed.

30 is a controller, and the collector 13 of the resin transfer pipe 12
The opening surface of the resin layer 4.5 is stored as the reference surface 31, and the separation interface 14 of the resin layer 4.5 is stored as the reference surface 31 based on the detection signal of the interface detector 20.
Adjust the flow rate of the flow rate control valve 6 so as to match 1,
Further, on-off valves 8 and 11 are opened and closed.

In the above ion exchange resin separation device.

As shown in FIG. 1(a), with the separation tower 1 filled with a mixed resin layer 3 of a cation exchange resin and 7 anion exchange resin, backwash water is introduced from the water supply pipe 7 to clean the inside of the separation tower 1. The mixed resin layer 3 is backwashed and developed by passing water in an upward flow to separate the cation exchange resin layer 4 and the anion exchange resin layer 5 based on the difference in specific gravity.

At this time, the incident light 22 is projected from each light projecting section 23 provided in each color discrimination sensor 26 of the interface detector 20 onto the resin layers 3.4, 5, and the light receiving section 25 receives the reflected light 24. The color of the portion where the discrimination sensor 26 is provided is discriminated.

Color display is performed on the display board 29 by the light emitting diode 28.

Based on the discrimination results of each color discrimination sensor 26, the interface detector 20 detects the separation interface 14 between the resin layers 4 and 5, and the controller 3
Enter 0. The controller 30 stores the opening surface of the collector 13 of the resin transfer tube 12 as a reference surface 31, and
As shown in FIG. 1(a), when the separation interface 14 is higher than the reference surface 31, the flow control valve 6 is throttled, and as shown in FIG. 1(b) and FIG. 2(b), when it is lower, the flow control valve 6 is opened. Control is performed so that the separation interface 14 coincides with the reference plane 31.

As shown in FIG. 1(C) and FIG. 2(c), when the separation interface 14 coincides with the reference plane 31, the on-off valve 8 of the drain pipe 9 is closed, and the on-off valve 11 of the resin transfer pipe 12 is opened. And, the seven ion exchange resin layers 5 above the separation interface 14 are connected to the resin transfer pipe 1.
2 and transferred to an anion exchange resin regeneration tower. The cation exchange resin and anion exchange resin thus separated are each regenerated separately and then mixed to be used in a mixed bed type ion exchange device or the like.

In the above embodiment, the color discrimination sensor 26 is connected to a plurality of light projectors 23.
Although it is configured by a combination of a plurality of light receiving sections 25 and a plurality of light receiving sections 25, the light emitting section 23
may be provided commonly to each color discrimination sensor 26. Further, although the interface detector 20 is provided in the viewing window 15, it may also be provided inside the separation column 1.

〔Effect of the invention〕

As described above, according to the present invention, an interface detector in which a plurality of color discrimination sensors having a light emitting part and a light receiving part are arranged is provided to detect the separation interface of the resin layer, and the flow rate is adjusted by the controller. Since the separation interface is made to match the opening surface of the resin transfer tube, the separation interface of the resin layer can be detected accurately and quickly without manual intervention, and the separation interface can be matched with the opening surface of the resin transfer tube. The resin can be transferred, thereby making it possible to automate the resin separation operation.

[Brief explanation of drawings]

Figures 1 (a) to (d) are system diagrams showing the operating state of the separation device of the example, Figures 2 (a) to (C) are operation explanatory diagrams, and Figure 3.
The figure is a front view of the interface detector, and FIG. 4 is its AA sectional view. In each figure, the same reference numerals indicate the same or corresponding parts, 1 is a separation column, 3 is a mixed resin layer, 4 is a cation exchange resin layer, 5 is an anion exchange resin layer, 6 is a flow rate control valve, 7 is a water supply pipe, 9
1 is a drain pipe, 12 is a resin transfer pipe, 14 is a separation interface, 15 is a viewing window, 16 is a window glass, 2o is an interface detector, 23 is a light emitter, 25 is a light receiver, 26 is a color discrimination sensor, and 28 is a A light emitting diode, 30 a controller, and 31 a reference plane. Agent Patent Attorney Sei Yanagihara Figure 3 Figure 4

Claims (1)

[Claims] (1) A separation tower filled with a mixed resin of cation exchange resin and anion exchange resin, a water supply pipe that introduces backwash water into the lower part of this separation tower to perform backwash separation of the resin, and a water supply pipe installed in this water supply pipe. A drain pipe that discharges backwash wastewater from the upper part of the separation tower, a resin transfer pipe that opens into the separation tower to discharge the separated anion exchange resin, and a resin layer that emits light. A plurality of color discrimination sensors each having a light emitting part and a light receiving part for receiving reflected light are arranged vertically near the separation interface of the resin layer, and a detection signal from this interface detector detects the separation interface of the resin layer. and a controller for controlling the flow rate control valve so that the flow rate adjustment valve matches the opening surface of the resin transfer pipe.