JPS60172391A - Manufacturing apparatus of demineralized water - Google Patents

Abstract

PURPOSE:To prevent securely the leakage of silica, etc. into the demineralized water by comparing the difference between the estimated time when the reference value at the part between the weakly basic anion-exchange resin and the strongly basic anion-exchange resin is exceeded and the time when the reference value is actually exceeded. CONSTITUTION:The total amt. of the components to be removed can be obtained on the basis of the permittivity C1 and the flow rate F of the original water by obtaining previously the relationship with the electrical conductivity from the provious water quality measurement. The ion-exchange capacity of a weakly basic anion-exchange resin 5 and a strongly basic ion-exchange resin 6 can be previously obtained. The time when the C2 exceeds the reference value due to the leakage of the anion from the weakly basic anion-exchange resin 5 can be calculated on the basis of said ion-exchange capacity and the load of the orginal water. The time when the C3 exceeds the specified electrical conductivity of the water quality can be calculated in the same way, and the time when the intake of the water is finished can be obtained by multiplying a safety factor to prevent the leakage of silica into said time.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Kibatsu IJJ relates to pure water production equipment, especially a multi-layer type two-bed three
The present invention relates to a water purification apparatus having a weak basic anion exchange resin and a strong 311 base anion exchange resin, such as a tower-type water purification apparatus.

[Prior art] A two-bed, three-column pure water production device is composed of a column filled with a cation exchange resin (cation column), a degassing column, and a column filled with a basic anion exchange resin (anion column). It was the most popular device since then, and is still widely used today. Among these, a multilayer type in which a weakly basic anion exchange resin is filled on the water introduction side of the anion column and a strongly basic anion exchange resin is filled on the first side is iffff.
It is widely used because of its high rate. Figure 1 is a schematic diagram of a multi-layer, two-bed, 3↓6 type pure water production device. This device °Iv (mainly consists of a cation column 1, a degassing column 2, and an anion field 3, and an anion column 31 is filled with a weakly basic anion exchange resin 5 and a strongly basic anion exchange resin 6'). Raw water is passed through pipe 71τ7 to cation tower 1, and after the cations in the water are exchanged with ions on the water in cation exchange resin 4, it is passed through pipe 8 to degassing tower 2. , carbon dioxide (and dissolved oxygen) is removed, and then the water is passed through the anion tower 3 through the pipe 9, where it is exchanged with contained anions or hydroxide ions and silica is removed, producing pure water. 10 is a connection pipe to the pure water tank.

The 11th grade of ion exchange resin has a cation rating of 1 and a ratio of 1 to 1. Salt from r311 (after pouring the stopper, l'
To! υl ili L from tube 12, and anion tower 3
In this case, a flf agent such as 7-sodium soda is applied from pipe 13 and then discharged from +'iiQ't' 14.

Such a two-bed, three-column type ion exchange device is generally designed to cause a cation break (cations leak out before anions into the final treated water), and at the end of the treated water sampling process. is due to the change in conductivity of the water quality at the cation tower outlet! I'll be configured to disconnect. This is determined by the water quality of the anion tower in the treated water sampling process.
! : In the case of using an anion break to judge "J", the conductivity cannot be checked even if silica releases 2111, and the judgment of the end of the water sampling process will be incorrect.

However, even in pure water production equipment designed to produce cation breaks, anion breaks may occur due to fluctuations in raw water quality, deterioration of ion exchange resins, and other causes. Even if silica leaks out due to X'f- before the anion actually leaks due to the anion break, it cannot be checked using the 41[ratio] as described above. Therefore, water is collected as is, and silica is added to the pure water.
I started to enter. Furthermore, even if a silica force meter is installed to detect silica, since this silica force meter uses a cinch type measurement, it is not possible to quickly respond to changes in the quality of the treated water. Moreover, measurement using a Siri force meter is costly, -:1
There is also the problem of becoming

[Objectives of the Invention] 1-1 of the present invention is to provide a pure water production system Ff that solves the problems of the prior art described above and reliably prevents leakage of silica, etc. into pure water. It's about doing.

``Structure of the Invention'' The pure water production apparatus of the present invention is characterized by the ability of the weak basic anion/ion exchange resin and the strong basic anion exchange resin to Predict the point at which the water exceeds the standard water quality and the weak basic anion Exchange resin and strong JyA], (
Compare the point in time when the base IJli value exceeds the measured value in the area between the two points and the actual point in time when the reference value exceeds the measured value, and determine the end of water sampling according to the difference between the two points. Move the f point forward or 2
It was designed to be extended.

[Embodiments of the invention] Examples will be described below.

FIG. 2 is a system diagram of a pure water production apparatus according to an embodiment of the present invention, and the same parts as the conventional system r1 in FIG. 1 are designated by the same number 93.

In this embodiment, the pipe 7 that supplies raw water to the cation 431, the part between the weakly basic anion exchange resin 5 and the strongly basic anion exchange resin 6 of the anion column 3, and the connecting pipe io to the pure water tank are Conductivity meters 15, 16, and 17 (the detected values are C, C2, and C3) are installed, respectively. i'
A flowmeter 18 is installed at IO (the detected flow rate is F).
are installed, and the output values of conductivity meters 15 to 17 and flow meter 18 are manually input to a controller 19. Note that the flow meter only needs to be able to measure the amount of water flowing through the system, and can be used at other locations such as pipe 7.
It may be set in In this example, the cation class 1 includes a weakly acidic cation exchange resin 4a and a strongly acidic cation exchange resin 4.
b), but it is also possible to fill only one strongly acidic cation exchange resin. Furthermore, although the cation column and anion column are filled with two types of ion exchange resins in the column, they may be filled in separate ↓h and the water may be passed therethrough. In the figure, 20 indicates an inert resin.

The operation of controller 19 will be described below.

J5; (The total amount (load) of components to be removed that are twisted by the tree is r
Megwood All i: By setting one river connection with L conductivity-i4, 18; (Water J1. Electricity-f Pe C1 and flow rate F
It is possible to conclude on the basis of

In addition, the ion exchange capacity acids of the weak J1A base anion exchange u1 fat 5 and the strong base anion exchange resin 6 can be prepared in advance, and this ion exchange stand can be used to At the point when anion leaks from the ion exchange resin 5 and C2 exceeds the standard f1, OA is 4 ft a): 1
points) can be calculated. Also in the same forest, C3 is j
It is possible to calculate the point at which the electrical conductivity of the fixed wood material is exceeded, and at this point 111j, a safety point is added to prevent silica leakage.
(When the anions pass through the strongly basic anion exchange resin 6 and the conductivity increases, λ゛L becomes 2)
Does this anion have the ability to emit 111++l?
Take into account the possible time of silica leakage. ), it is possible to determine the point in time when the amount of water sampling should end. In addition, water sampling is shown in Figure 5! Let's look at an example of changes in lj, C, and C3, and Sio2 leak f, , l, and j.

The point in time when the standard 4f4 determined as described above is exceeded is actually measured due to fluctuations in the original ice and water and deterioration of the resin. ,
! I! There is a difference from the time when i exceeds half price.

The calculated point in time when the standard value A16 was exceeded was compared with the actually measured point in time when the standard value was exceeded, and the actual measured point was -
If I+1, the water sampling amount is postponed by one time point, and conversely, if the actual measurement time point is later than the calculation time point, the water sampling end point is delayed accordingly.

To end the water sampling, although not shown, the raw water pump is stopped to stop the raw water supply from the piping 7. Then, each of the ion exchange resins in the cation column 1 and anion column 2 is replaced with an acid or ion exchange resin. Regenerate with I11 crude drugs such as jY sorta.

Note that the output fc3 from the conductivity meter 17 is used for water quality monitoring, etc.

FIG. 3 is a block diagram showing a schematic configuration of the controller 19. This controller 19 is a multiplayer that selects data from an input means 23 that manually inputs the outputs fiC-C3 and F of the conductivity meters 15 to 17 and the flowmeter 18 as well as the half value of 02) to an arithmetic and judgment circuit 24. A Δ/D converter 22 converts an input analog signal into a digital signal, based on the input signal 1. Perform a series of calculations as described above, and when the predetermined conditions are met, water sampling 4? '; An operational circuit 24 that emits
Equipped with an amplifier 25 that amplifies the water sampling signal and issues a control signal to the water sampling 1'I; .

The fjSd diagram is a flowchart 1 showing an example of the control 1 program.
J(1: I〆〆[Input) +k It'' value is exceeded, the amount of water sampled is 1 time point (Step 42). Next, manually input C2 and compare 02?!'j i+rt Step 43. 44), C or C2), I (?lI+i) If it is a straight load, go to step 43. On the other hand, if C2 exceeds the C2 reference value, go to step 45 Jtr7Ill
The point in time when the base 411 value was exceeded and actually C2),',:
The amount of water sampled (II
Add 11- to the +j point (step 45), then wait until the water sampling end rllv point drawn 11° in step 46, and then output the shaking water end r signal (step 47)
.

The amount of water sampled at one point in time is then supplemented as described in ゛°, thereby preventing silica and other substances to be removed from being mixed into the pure water.

[Effects of the Invention] As described above, the pure water production apparatus of the present invention reliably prevents leakage of silica and the like into pure water, and the reliability of the apparatus is extremely high.

[Brief explanation of the drawing]

11th'i! 1 is a system diagram of a 2-bed, 3-column type pure water production apparatus, FIG.
FIG. 3 is a block diagram of the controller 19, No. 41) is a flowchart relating to an example of the control program, and FIG. 5 is a graph showing the relationship between the amount of water sampled and water quality fluctuation. 1. Conflict Q cation not yet 6, 2... Removal tower, 3II.
fist anion tower. 15.16.17...Conductivity meter, 18...Flow h151, 19...Controller. Patent applicant Kuri IJJ Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 9 Figure 5 Matcha amount m3

Claims (2)

[Claims] (1) In an apparatus that is equipped with a cation exchange resin, a weakly basic anion exchange resin, and a strong salt (external anion exchange tree JY1) and produces pure water by passing water in this order, The first conductivity meter installed on the upstream side, weak 11!), % anion exchange resin and strong J1! The second conductivity d1 installed between the base anion exchange resin and the water flow li (measurement r stage, the first conductivity if
Detected value of f water flow 1k iii: and the load from this load and each of the above 1! Exchange table for basic anion exchange resin! i)
and the measured value of the second conductivity meter exceeds the standard value I
Q value, the time when Tfl passes, strong basic anion exchange resin output, 1 step to pin the point at the end of water sampling where the I water exceeds the specified water quality, the predicted standard 1fI exceeds the time and the actual measurement standard if
A pure water production apparatus characterized by comprising: a means for comparing the end point of water sampling with the end point of fil and advancing or delaying the end point of water sampling according to the difference between the two points. (2) - The pure water production apparatus according to claim 1, wherein the column is filled with a weakly basic anion exchange resin and a strongly basic anion exchange resin.