JP2019155296A - Pure water production apparatus - Google Patents

Abstract

To provide a pure water production apparatus capable of treating an ion exchanger with a more optimal regeneration frequency and amount of regenerant, reducing running costs, and suppressing deterioration of the quality of pure water.SOLUTION: The present invention provides a pure water production apparatus 1 that produces pure water using an ion exchange tower 2 that passes water to be treated through an ion exchanger to obtain treated water. The pure water production apparatus has: a conductivity meter 4 that is disposed at a preset position in the ion exchange tower 2 so as to be in contact with the ion exchanger 3 and includes at least one pair of electrodes to continuously measure a resin conductivity of the ion exchanger 3; and abnormality detection means 11 that detects a change in the measured value of the resin conductivity due to the adsorption or desorption of a plurality of ions passing through the ion exchange tower 2 to the ion exchanger 3, based on the measurement result of the conductivity meter 4 at the preset position, and generates an abnormality detection signal for warning of the occurrence of an abnormality when a change in the measured value of the resin conductivity due to ions that affect the quality of the treated water is detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pure water production apparatus, and more particularly, to an ion exchange type pure water production apparatus for producing pure water or ultrapure water used for pharmaceutical production, semiconductor production, boiler water for power generation, foods and the like. The present invention relates to a pure water production apparatus capable of detecting an abnormality.

  2. Description of the Related Art An ion exchange type pure water production apparatus for producing pure water or ultrapure water used for pharmaceutical production, semiconductor production, boiler water for power generation, foods and the like is known. The ion exchange type pure water production apparatus is an apparatus for producing pure water by bringing raw water into contact with an ion exchanger or the like and removing anions and cation components contained in the raw water by an ion exchange reaction. The ion exchanger can be used repeatedly by periodically regenerating with an acid and an alkali.

  In recent years, due to higher integration of semiconductors, etc., the purity of pure water required for pure water production equipment has been increased, and the amount of chemicals used for regeneration has been reduced to reduce running costs to the utmost. Yes. However, if the appropriate regeneration frequency and the amount of regenerated chemicals are not adjusted, regeneration failure of the ion exchanger occurs and the risk of deterioration of the quality of pure water increases.

  The most orthodox method conventionally used as a method for determining the regeneration frequency is a method in which the ion concentration of raw water is regarded as constant, and the ion exchanger is regenerated when a certain amount of raw water is passed. However, when the ion concentration of the raw water rises due to seasonal fluctuations, the frequency of regeneration is insufficient, so the quality of the treated water is lowered. If the amount of medicine and the frequency of regeneration are set large in anticipation of seasonal fluctuations, the medicine will be consumed wastefully, and the running cost will increase. In addition, since the ion exchanger deteriorates over time due to dirt and the like, the capacity of the facility decreases and the quality of the treated water decreases even if there is no seasonal variation. When the amount of chemicals and the frequency of regeneration are set in consideration of the decrease in equipment capacity, there is a problem that the running cost further increases.

  As one of means for solving these problems, for example, as described in JP-A-3-181384 (Patent Document 1), the conductivity of raw water is measured to calculate ion load, and the ion load of raw water is calculated. There is a method that determines the regeneration frequency by taking the ion load into consideration.

  However, the calculation method of the ion load based on the conductivity is limited in accuracy because an error occurs depending on the ion species and pH. Particularly, among ions, for example, silica is a weak electrolyte, so that it is difficult to appear in the conductivity, and an error may occur when the ion load is estimated from the conductivity of raw water. Although other analyzers can be installed, the initial cost and running cost increase. Furthermore, as with the prior art described above, ion exchangers deteriorate over time due to dirt, etc., so that even if there is no seasonal variation, the capacity of the equipment is reduced and the quality of the treated water is reduced. Considering, even when the technique of Patent Document 1 is used, the reduction of the regeneration frequency and the amount of the regenerant is limited.

  As another prior art, the pH of ion regeneration waste solution is measured, and the amount of chemical used for regeneration is suppressed by monitoring the amount of the regenerant to be passed based on the measured value (Japanese Patent Laid-Open 9-117679 (Patent Document 2)) and a method of measuring silica in treated water with an analyzer.

  However, each method has a limit in the accuracy of monitoring, and the measuring device is expensive and the equipment size is increased, resulting in an increase in running cost and maintenance cost. In addition, the ion exchange column containing the ion exchanger has little information obtained by visual observation, and it is difficult to grasp the internal state of the ion exchange column using a water quality meter connected to the outside of the ion exchange column. For this reason, measures are taken after the deterioration of the properties of the treated water discharged from the ion exchange tower, or the treatment is performed under conditions that allow a margin in advance so that the properties of the treated water do not deteriorate. It was.

JP-A-3-181384 JP-A-9-117679

  In view of the above problems, the present invention provides a pure water production apparatus that can treat an ion exchanger with a more optimal regeneration frequency and amount of regenerant, reduce running costs, and suppress deterioration in the quality of pure water.

  As a result of intensive studies by the present inventors in order to solve the above problems, a conductive material provided with at least one pair of electrodes for continuously measuring the resin conductivity of the ion exchanger at a predetermined position in the ion exchange column. Based on the change in measured value of resin conductivity per hour when a fixed meter is placed and observed at a fixed point, the change in measured value of resin conductivity due to ions affecting the quality of treated water It has been found that it is one of useful means to provide an abnormality detection means for generating an abnormality detection signal for warning the occurrence of an abnormality when detected.

  The pure water production apparatus according to the embodiment of the present invention completed on the basis of the above knowledge is, in one aspect, purified water using an ion exchange tower that passes treated water through an ion exchanger to obtain treated water. An apparatus for producing pure water, which is disposed so as to be in contact with an ion exchanger at a preset position in an ion exchange tower, and has at least one pair of electrodes for continuously measuring the resin conductivity of the ion exchanger. Change in measured value of resin conductivity due to adsorption or desorption of a plurality of ions passing through the ion exchange tower based on the conductivity meter provided and the measurement result of the conductivity meter at each measurement position And an abnormality detection means for generating an abnormality detection signal for warning the occurrence of an abnormality when a change in the measured value of the resin conductivity due to ions affecting the quality of the treated water is detected.

  In one embodiment, the pure water production apparatus according to an embodiment of the present invention is such that the ion exchange tower is a cation tower, and the abnormality detection means is more than a first set value in which a measured value of resin conductivity is set in advance. A first abnormality detection signal is generated when the voltage drops, and a second abnormality detection signal is generated when the measured value of the resin conductivity falls below a second setting value lower than the first setting value.

  In another embodiment of the pure water production apparatus according to the embodiment of the present invention, when the ion exchange tower is a cation tower and the abnormality detecting means detects a change in resin conductivity due to calcium ions, An abnormality detection signal is generated.

  In yet another embodiment of the pure water production apparatus according to the embodiment of the present invention, the pure water production apparatus includes a cation tower, a decarboxylation tower, and an anion tower, and a resin by a conductivity meter provided in the cation tower. When the abnormality detection means generates an abnormality detection signal based on the measured conductivity value, the apparatus further comprises a circulation means for circulating at least a part of the treated water of the anion tower to the cation tower.

  In yet another embodiment of the pure water production apparatus according to the embodiment of the present invention, the ion exchange tower is an anion tower, and the abnormality detection means is configured so that the temporal change in the measured value of the resin conductivity tends to decrease. When an upward trend is observed and the upward trend of the measured value of the resin conductivity continues for a preset time or more, an abnormality detection signal is generated.

  In yet another embodiment of the pure water production apparatus according to the embodiment of the present invention, the ion exchange tower is an anion tower, and the abnormality detecting means changes the resin conductivity due to silica ions contained in the water to be treated. Is detected, an abnormality detection signal is generated.

  In yet another embodiment of the pure water production apparatus according to the embodiment of the present invention, the pair of electrodes is located downstream of the middle of the inlet and outlet of the ion exchange tower with respect to the direction of water flow. Be placed.

  In another aspect, the pure water production apparatus according to an embodiment of the present invention is a pure water production apparatus that produces pure water using an ion exchange tower that passes treated water through an ion exchanger to obtain treated water. And a conductivity meter that is disposed in contact with the ion exchanger at a preset position in the ion exchange column and includes at least one pair of electrodes that continuously measure the resin conductivity of the ion exchanger. An ion exchange tower, a storage tank capable of storing treated water, water quality information obtaining means for obtaining water quality information from the supply source of treated water, and water to be treated based on the water quality information Supply control means for controlling supply to the ion exchange tower and supply of treated water to the storage tank.

  In still another aspect of the pure water production apparatus according to the embodiment of the present invention, pure water production is performed using an ion exchange tower that obtains treated water by passing water to be treated through an ion exchanger. An electrical conductivity meter that is disposed in contact with the ion exchanger at a preset position in the ion exchange tower and includes at least one pair of electrodes that continuously measure the resin conductivity of the ion exchanger. Based on the measurement results of the conductivity meter at a preset position and the ion exchange tower provided, at least one of the amount of water to be treated supplied to the ion exchange tower, the amount of chemicals, and the regeneration frequency of the ion exchanger A processing condition determining means for determining a processing condition to be included, a transmitting means capable of transmitting the determined processing condition determined by the processing condition determining means to a remote control server means connected to be communicable, and a processing condition update from the remote control server information A plurality of processing conditions determining means provided in each of a plurality of pure water production apparatuses each having an ion exchange column provided with a conductivity meter including at least one pair of electrodes. The processing conditions are recalculated based on the determined processing conditions, and processing condition update information obtained by the recalculation is transmitted to the receiving means.

  ADVANTAGE OF THE INVENTION According to this invention, the pure water manufacturing apparatus which can process an ion exchanger with more optimal regeneration frequency and the amount of regeneration agents, can reduce running cost, and can suppress the deterioration of the quality of pure water can be provided.

It is the schematic showing the example of the pure water manufacturing apparatus which concerns on the 1st Embodiment of this invention. It is a graph showing the example of the change of the resin electrical conductivity by adsorption | suction and desorption | suction to the ion exchanger of each ion component at the time of cation tower water flow. It is a graph showing the example of the change of Ca solid-phase density | concentration of a cation exchange resin, Na solid-phase density | concentration, resin conductivity, and resin conductivity 2nd-order differential value in a certain point (210 mm position) in a cation tower | column. It is a graph showing the example of the change of Ca solid-phase density | concentration of a cation exchange resin, Na solid-phase density | concentration, resin conductivity, and resin conductivity 2nd-order differential value in a certain point (510 mm position) in a cation tower | column. It is a figure showing the processing flow at the time of using a cation tower in the pure water manufacturing apparatus which concerns on 1st Embodiment. It is a graph showing the example of the change of the resin electrical conductivity by adsorption | suction to the ion exchanger of each ion component at the time of anion tower water flow, and desorption. It is a graph showing the example of the change of the chloride ion solid phase concentration of the anion exchange resin in a certain point (300 mm position) in an anion tower, a silica ion solid phase concentration, and a resin conductivity measured value. It is a graph showing the example of the change of the chloride ion solid phase concentration of the anion exchange resin in a certain point (500-mm position) in an anion tower | column, a silica ion solid phase concentration, and a resin conductivity measured value. It is a figure showing the processing flow at the time of using an anion tower in the pure water manufacturing apparatus which concerns on 1st Embodiment. It is the schematic showing the structural example of the pure water manufacturing apparatus which concerns on 2nd Embodiment. Liquid phase conductivity and resin conductivity in the cation tower (solid phase conductivity in the cation tower) and resin when treated water obtained in the anion tower is circulated to the cation tower using the circulation means shown in FIG. It is a graph showing the true value of electrical conductivity. When the treated water obtained in the anion tower is circulated to the cation tower using the circulation means shown in FIG. 10, the liquid phase conductivity and resin conductivity (solid phase conductivity in the anion tower) and resin in the anion tower It is a graph showing the true value of electrical conductivity. It is the schematic showing the outline | summary of the water treatment system containing the pure water manufacturing apparatus which concerns on 3rd Embodiment. It is the schematic showing the structural example of the pure water manufacturing apparatus which concerns on 3rd Embodiment. It is a table | surface showing the comparison of the chemical | medical agent cost when not performing (lower column) when pure water manufacture is performed using the pure water manufacturing apparatus which concerns on 3rd Embodiment (lower column). It is the schematic showing the example of the water treatment system provided with two or more the pure water manufacturing apparatuses which concern on 4th Embodiment. It is the schematic which shows the structural example of the pure water manufacturing apparatus which concerns on 4th Embodiment.

  Hereinafter, first to fourth embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding components are denoted by the same or similar reference numerals. The following description exemplifies an apparatus and a method for embodying the technical idea of the invention, and the technical idea of the invention specifies the structure, arrangement, etc. of the component parts as follows. Not what you want.

(First embodiment)
As shown in FIG. 1, the pure water producing apparatus according to the first embodiment of the present invention uses pure water using an ion exchange tower 2 that passes treated water through an ion exchanger 3 to obtain treated water. Is a pure water production apparatus 1 for producing an ion exchanger 3, which is disposed in contact with the ion exchanger 3 at a preset position in the ion exchange tower 2, and continuously measures the resin conductivity of the ion exchanger 3. Anomaly detection that generates an anomaly detection signal for warning the occurrence of an abnormality in treated water based on the ion exchange tower 2 having the conductivity meter 4 having a pair of electrodes and the measurement result of the conductivity meter 4 Means 11.

  In the present embodiment, “continuously measured” means not only when the resin conductivity is constantly measured, but also at regular intervals (for example, every several minutes to several hours) during the operation period of the pure water production apparatus 1. This includes the case of measuring the resin conductivity. Since the resin conductivity of the ion exchanger 3 is continuously measured through the conductivity meter 4 including at least one pair of electrodes arranged so as to be in contact with the ion exchanger 3, ions are measured through the measurement result of the resin conductivity. The state (resin performance) of the exchanger 3 can be grasped in real time. As a result, since the performance degradation of the ion exchanger 3 can be determined more quickly, the regeneration time and replacement time of the ion exchanger 3 can be accurately determined.

  In the present embodiment, the “resin conductivity” means the conductivity of the solid phase in the ion exchange tower 2, that is, the conductivity of the ion exchange resin constituting the ion exchanger. By arranging at least one pair of electrodes provided in the conductivity meter 4 so as to be in direct contact with the ion exchange resin, the conductivity of the ion exchange resin constituting the ion exchanger 3 accommodated in the ion exchange tower 2 is directly measured. It can be measured.

  The ion exchange tower 2 accommodates the ion exchanger 3 therein, and allows water to be treated to pass through the tower and contact with the ion exchanger 3, thereby removing inorganic dissolved impurities in the water to be treated. A specific configuration is not particularly limited as long as it is possible. As the ion exchanger 3, an ion exchanger including a cation exchange resin, an anion exchange resin, and a mixed bed type ion exchange resin obtained by mixing these resins is used.

  As shown in FIG. 1, a conductivity meter 4 having a pair of electrodes (not shown) is disposed at the lower part of the outer surface of the ion exchange column 2. The specific configuration of the conductivity meter 4 is not limited. For example, in the state where two rod-shaped or plate-shaped electrodes formed of a corrosion-resistant material such as stainless steel are separated from each other by a distance of about 2 to 10 mm between the electrodes, ions are transferred from the outer surface of the ion exchange tower 2 to the inside. It can be inserted in a direction crossing the height direction (water flow direction) of the exchange tower 2.

  Alternatively, a conductivity meter 4 in which two electrodes having opposite polarities (+/−) are concentrically arranged via an insulating layer may be inserted into the ion exchange column 2. Alternatively, a conductivity meter 4 having a plurality of measurement terminals for measuring the solid phase conductivity of the ion exchange column 2 along the height direction of the ion exchange column 2, that is, the resin conductivity of the ion exchanger 3. You may make it adhere to the inner wall of the ion exchange tower 2, or make it extend in the inner wall vicinity.

  In order to grasp the state of the ion exchanger 3 more accurately, it is preferable to detect the state of the ion exchanger 3 on the outlet 22 side rather than the ion exchanger 3 on the inlet 21 side of the ion exchange tower 2. For this reason, as shown in FIG. 1, the conductivity meter 4 has an intermediate (50) between the inlet 21 (top of the tower) and the outlet 22 (bottom of the tower) of the ion exchange tower 2 with respect to the direction of water flow. %) Is preferably arranged on the downstream side. More preferably, the tip of the electrode of the conductivity meter 4 (conductivity detection) at a position that is 60% or more downstream, more preferably 70% or more downstream from the inlet (0%) to the outlet (100%). The portion is in contact with the ion exchanger 3.

  The conductivity meter 4 is preferably arranged at two or more locations in the height direction of the ion exchange tower 2. For example, a pair of electrodes are arranged in each of the upstream, middle stream, and downstream regions as viewed from the direction of water flow of the ion exchange tower 2, and the resin conductivity on the upstream, middle stream, and downstream sides of the ion exchanger 3 is measured. It is preferable. The ion exchanger 3 inside the ion exchange tower 2 has a concentration gradient of ions passing through the ion exchange tower 2 in the direction of water flow, and the resin conductivity changes between the inlet side and the outlet side of the ion exchange tower 2. However, by arranging the conductivity meters 4 at a plurality of locations and measuring the resin conductivity in the local region of the ion exchanger 3 from a plurality of locations, the resin performance of the ion exchanger 3 can be grasped in more detail. Can do.

  In order to increase the detection accuracy of the conductivity meter 4, it is preferable that a lining layer (not shown) made of a nonconductive material such as a resin is disposed on the inner surface of the ion exchange tower 2. Alternatively, the ion exchange tower 2 itself may be made of a nonconductive material.

  An AC voltage is preferably applied between the electrodes of the conductivity meter 4. Thereby, compared with the case where a direct-current voltage is applied between electrodes, it can prevent that polarization arises on the surface of an electrode and can measure the resin conductivity of the ion exchanger 3 stably for a long period of time.

  Since a plurality of ions coexist in the ion exchange tower 2 in the flow of the water to be treated, the measured value of the resin conductivity of the ion exchanger 3 measured by the conductivity meter 4 is influenced by the plurality of ions in the tower. To show complex changes.

  However, when the behavior of the ion exchanger 3 at the same location in the ion exchange tower 2 is observed at a fixed point, it has been found that there are few regions where three or more ions exist simultaneously at the same location. That is, between a plurality of ions passing through the ion exchange column 2, the diffusion (ease of movement) of ions and the ease of removal of ions (selection coefficient) do not coincide with each other. It was found that the ion distribution in the inside was determined, and the change in the measured value of the resin conductivity measured by the conductivity meter 4 also varied depending on the ion distribution. By observing the change in the measured value, it was found that the internal state of the ion exchange tower 2 can be grasped in more detail, and the regeneration time and replacement time of the ion exchanger 3 can be accurately determined.

FIG. 2 shows the solid phase concentration distribution in the tower and the adsorption and desorption of each ion component on the ion exchanger during each operation time of sodium ion (Na ⁺ ) and calcium ion (Ca ²⁺ ) when the cation tower is passed through. It is a graph showing the example of the state in a tower in each operation time of resin conductivity. In FIG. 2 and FIG. 3 and FIG. 4 to be described below, the solid phase concentration [−] = (Na ⁺ or H ⁺ ) ion solid phase concentration [mEq / L] / exchange capacity [mEq / L]. Is done.

In the cation tower, the ease of ion removal is, for example, Li ⁺ <Na ⁺ <Mg ²⁺ <Ca ²⁺ . In the case of fixed point observation (observation at a specific height of the cation tower), a change in resin conductivity due to sodium ions first appears, and then a change in resin conductivity due to calcium ions appears. As time passes, the fluctuations in the solid phase concentration of these ions move from the inlet side to the outlet side of the ion exchange column.

3 and 4 pass through the resin conductivity, the second-order differential value of the resin conductivity change, and the cation tower at positions 210 mm and 510 mm from the entrance of the cation tower of the pure water apparatus according to the embodiment of the present invention. it is a graph showing the solid concentration of sodium ions (Na ⁺⁾ and calcium ions (Ca ^2+). The “resin conductivity second-order differential value” indicates a result obtained by differentiating the resin conductivity value twice with respect to time.

  For example, as shown in FIG. 3, paying attention to the change in conductivity of the cation exchange resin at 210 mm from the entrance of the cation tower (“resin conductivity” represented by the solid line in FIG. 3), sodium ions and calcium ions It can be seen that the resin conductivity once decreases with increasing solid phase concentration (SP1), and further that the resin conductivity further decreases with increasing solid phase concentration of calcium ions in addition to sodium ions. (SP2). Similarly, in the example shown in FIG. 4, the resin conductivity once decreases as the solid phase concentration of sodium ions and calcium ions increases (SP1), and further, the solid phase concentration of calcium ions increases rapidly in addition to sodium ions. Along with this, the resin conductivity further decreases (SP2).

  Therefore, the abnormality detection means 11 provided in the computer (PLC) 100 connected to the conductivity meter 4 detects a change in the measured value of the resin conductivity as shown in FIGS. It can be configured to generate a detection signal.

  That is, the anomaly detection means 11 is based on the measurement result of the conductivity meter 4, and the measured value of the resin conductivity due to adsorption or desorption of a plurality of ions passing through the ion exchange tower 2 to the ion exchanger 3. An abnormality detection signal for warning the occurrence of an abnormality when a change in the measured value of the resin conductivity due to ions affecting the quality of the treated water discharged from the ion exchange tower 2 is detected. Configured to generate.

  Therefore, as shown in FIG. 1, the abnormality detection unit 11 can include, for example, a detection unit 111, a determination unit 112, and an output unit 113. The detection unit 111 acquires the measurement result of the resin conductivity by the conductivity meter 4, and the measured value of the resin conductivity due to adsorption or desorption of a plurality of ions passing through the ion exchange tower 2 to the ion exchanger 3. Detect changes.

  The determination unit 112 reads determination information, which is information for determining a change in the measured value of the resin conductivity, from the storage device 110 connected to the computer 100, and discharges it from the ion exchange tower 2 based on the determination information. It is determined whether or not a change in the measured value of the resin conductivity due to ions affecting the quality of the treated water is detected.

  Based on the determination result of the determination unit 112, the output unit 113 detects an abnormal condition when a change in the measured value of the resin conductivity due to ions affecting the quality of the treated water discharged from the ion exchange tower 2 is detected. An abnormality detection signal for warning the occurrence is generated, and the fact that an abnormality has been detected is output to the output means 130 capable of outputting characters, sounds, light, and the like. The output unit 130 outputs predetermined warning information to the user in response to the output of the abnormality detection signal. The computer 100 includes an input unit 120 for inputting necessary information such as setting conditions and a storage device 110 for storing predetermined information such as a processing program of the computer 100.

  Specifically, as illustrated in the process flow of FIG. 5, in step S11, the change in the measured value of the resin conductivity due to ions affecting the quality of the treated water discharged from the ion exchange tower 2 in the cation tower. As a setting condition for detecting the first, a first setting value (value SP1 in FIGS. 3 and 4) that causes a change in the measured value of the resin conductivity due to sodium ions, and a second setting that causes a decrease in the resin conductivity due to calcium ions. Each processing flow will be described by taking as an example a case where a value (value SP2 in FIGS. 3 and 4) is set to be detected.

  In step S <b> 12, the detection unit 111 detects the measured value of the resin conductivity by the conductivity meter 4. In step S13, the determination unit 112 determines whether or not the measured value of the resin conductivity measured by the conductivity meter 4 is lower than a preset first setting value (for example, the value SP1 in FIGS. 3 and 4). To do. If it is determined that the measured value of the resin conductivity measured by the conductivity meter 4 is lower than the first set value set in advance, the process proceeds to step S14, and the output unit 113 detects a change in the resin conductivity due to, for example, sodium ions. A first abnormality detection signal (first (light) alarm) indicating that this has been generated is generated and output to the output means 130 in step S15. In step S13, when the measured value of the resin conductivity by the conductivity meter 4 is not lower than a preset first set value (for example, the value SP1 in FIGS. 3 and 4), the process returns to step S12.

  In step S <b> 16, the detection unit 111 detects the measured value of the resin conductivity by the conductivity meter 4. In step S <b> 17, the determination unit 112 determines that the measured value of the resin conductivity measured by the conductivity meter 4 is a second set value lower than the preset first set value (for example, the value SP <b> 2 in FIGS. 3 and 4). It is determined whether it falls below. When the measured value of the resin conductivity by the conductivity meter 4 is not lower than the preset second set value, the process returns to step S12. On the other hand, when the measured value of the resin conductivity measured by the conductivity meter 4 is lower than the preset second set value, the process proceeds to step S19, and the output unit 113 detects a change in the resin conductivity due to calcium ions. A second abnormality detection signal (second (heavy) alarm) indicating this is generated and output to the output means 130 in step S19.

  In the above-described example, the method for evaluating the determination based on the absolute value of the resin conductivity by comparing with a plurality of preset values has been described. However, for example, the absolute value (SP3 in FIGS. 3 and 4) or the maximum value (SP3 in FIGS. 3 and 4) or the second-order differential value of the measured value of the resin conductivity as enclosed by the circles in FIGS. SP4) may be adopted as a determination criterion by the determination unit 112.

On the other hand, FIGS. 6 to 8 are examples of graphs showing ion exchange bands of chlorine ions (Cl ⁻ ) and silica ions (HSiO ₃ ⁻ ) in the anion tower. In the anion column, the easiness of removal of the ions, for _{^{example, HSiO 3 - <HCO 3 -}} <Cl - <SO 4 2- become. For example, when attention is paid to the chlorine ions and silica ions, when the fixed-point observation (observation at a particular height of the anion column), as shown in FIGS. 6 to 8, firstly Cl ^-, the change of the resin conductivity due occurs, Next, a change in resin conductivity due to HCO ₃ ⁻ occurs.

  For example, paying attention to the change in the resin conductivity of the anion exchange resin at positions 300 and 500 mm from the entrance of the anion tower (“resin conductivity measurement value” represented by the dotted line in FIGS. 6 and 7), the influence of chlorine ions However, the change in the measured value of the resin conductivity is changed from a decreasing tendency to an increasing tendency due to the influence of silica ions (circled portions in FIGS. 7 and 8). In addition, it turns out that this tendency shows the same tendency, respectively, moving from the upstream of the ion exchange tower 2 to the downstream with progress of processing time.

  Therefore, the abnormality detection means 11 provided in the computer (PLC) 100 connected to the conductivity meter 4 detects a change in the measured value of the resin conductivity as shown in FIGS. 7 and 8, for example, and generates an abnormality detection signal. To do. That is, the abnormality detection means 11 is based on the measurement result of the conductivity meter, when the change in the measured value of the resin conductivity changes from a downward trend to an upward trend, and this upward trend continues for a preset time or more, An abnormality detection signal is generated.

  Specifically, as exemplified in the flow of FIG. 9, first, setting conditions for detecting a change in the measured value of the resin conductivity due to ions that affect the quality of the treated water are extracted. In step S <b> 22, the detection unit 111 detects the measured value of the resin conductivity by the conductivity meter 4. In step S <b> 23, the determination unit 112 determines whether or not the change in the measured value of the resin conductivity by the conductivity meter 4 tends to decrease. If the change in the measured value of the resin conductivity by the conductivity meter 4 does not tend to decrease, the process returns to step S22. If the change in the measured value of the resin conductivity measured by the conductivity meter 4 tends to decrease, the process proceeds to step S23.

  In step S <b> 24, the determination unit 112 determines whether or not the change in the measured value of the resin conductivity measured by the conductivity meter 4 has turned upward. If it has not turned to an upward trend, the process returns to step S22. On the other hand, when it has turned to the upward tendency, it progresses to step S25, and the determination part 112 determines whether the upward tendency of the measured value of the resin conductivity continues more than the preset time. When the increasing tendency of the measured value of the resin conductivity does not continue for a preset time, the process returns to step S24. On the other hand, when the upward trend of the measured value of the resin conductivity continues for a preset time or longer, the determination unit 112 assumes that the change in the resin conductivity due to the silica ions in the ion exchange tower 2 occurs. Determination is made and the process proceeds to step S26. In step S26, the output unit 113 generates an abnormality detection signal indicating that a change in resin conductivity due to, for example, silica ions has been detected, and outputs the abnormality detection signal to the output unit 130 in step S19.

  According to the pure water producing apparatus according to the first embodiment, by including the abnormality detecting means 11 connected to the conductivity meter 4 for measuring the resin conductivity of the ion exchanger 3 in the ion exchange tower 2, The presence of ions that affect the quality of treated water, for example, calcium ions in the case of cation towers and silica ions in the case of anion towers, through changes in the resin conductivity at certain positions in the ion exchange tower 2 Therefore, before these ions are mixed into the treated water and discharged to the outside in the ion exchange tower 2, an abnormality such as a deterioration in the quality of the treated water can be detected at an early stage. As a result, it is possible to provide a pure water production apparatus and a pure water production method capable of treating the ion exchanger with a more optimal regeneration frequency and amount of the regenerant, reducing running costs, and suppressing deterioration of the quality of pure water.

(Second Embodiment)
The pure water production apparatus according to the second embodiment, as shown in FIG. 10, is a 2B3T multi-bed tower pure water production apparatus comprising a cation tower 30, a decarboxylation tower 40, and an anion tower 50. When the abnormality detection means 11 generates an abnormality detection signal based on the measured value of the resin conductivity by the conductivity meter 4 provided in the cation tower 30, at least a part of the treated water of the anion tower 50 is cation tower 30. And a switching means 8 for switching the supply of the treated water of the anion tower 50 and the raw water (treated water).

  The cation tower 30 and the anion tower 50 are each provided with a conductivity meter 4 provided with electrodes for contacting the ion exchanger in the tower and continuously measuring the resin conductivity. The cation column 30 and the anion column 50 are each provided with a computer (PLC) provided with the abnormality detection means 11 for detecting the abnormality in the ion exchange column shown in the first embodiment.

  When measuring the conductivity of the cation exchange resin in the cation tower 30, since the liquid phase conductivity is higher than that of the anion exchange resin in the anion tower 50, direct measurement of the conductivity of the cation exchange resin may be difficult. . Therefore, for example, when the conductivity of the cation exchange resin in the cation tower 30 falls below a predetermined value and an abnormality detection signal is generated by the abnormality detection means 11, at least a part of the treated water of the anion tower 50 is used. By circulating to the cation tower 30 via a circulation means 80 such as a pipe for circulation to the cation tower 30, the resin conductivity in the cation tower 30 can be accurately achieved. Also, by providing this circulation step, the resin conductivity of the ion exchanger 3 in the anion tower 50 can be accurately measured even at the inlet side of the anion tower 50 (upstream side by 50% or more in the direction of water flow). Can be measured.

11 and 12, countercurrent regeneration with a cation tower size of 1200 mm in diameter and a height of 3200 mm, an anion tower size of 1300 mm in diameter and a height of 2800 mm, a decarboxylation tower of 1100 mm in diameter and a height of 3900 mm (lower tank height 1500 mm). In the cation tower when the circulation process according to the second embodiment is carried out when the circulation flow rate is 50 m ³ / h and the raw water conductivity is 30 mS / m, using the pure water production apparatus 1 of the method 2 bed 3 towers. Changes in the liquid phase and solid phase conductivity (height 2000 mm position) and changes in the liquid phase and solid phase conductivity (height 2000 mm position) of the anion tower are shown.

  In the example shown in FIGS. 11 and 12, when the circulation process is started 20 minutes after the start of operation, the resin conductivity of the ion exchanger by the conductivity meter 4 gradually decreases in both the cation tower 30 and the anion tower 50, and the liquid phase The conductivity decreased, and the solid phase conductivity could be measured with high accuracy.

  According to the pure water producing apparatus according to the second embodiment, for example, there is a possibility that the detected value of the conductivity of the liquid phase in the ion exchange tower 2 becomes too high and the resin conductivity cannot be obtained accurately. In such a case, the electrical conductivity of the liquid phase in the ion exchange tower 2 can be reduced by performing the circulation step with the circulation means 80. Thereby, the measurement precision of the resin conductivity of the ion exchanger in the ion exchange tower 2 can be improved.

  In the above example, the case where the circulation by the circulation unit 80 is started when the abnormality detection unit 11 generates the abnormality detection signal has been described. However, this embodiment is not limited to the case where the abnormality detection means 11 generates an abnormality detection signal. For example, the cation tower of the treated water of the anion tower 50 by the circulation means 80 is based on a predetermined time interval. Of course, circulation to 30 may be performed.

(Third embodiment)
As shown in FIG. 13, the pure water production apparatus 1 according to the third embodiment of the present invention is a water treatment system that shares water quality information with a supply source of water to be treated that is treated by the pure water production apparatus 1. . In the place where water to be treated of the pure water production apparatus 1 according to the third embodiment is taken, the water quality such as ionicity and turbidity may change depending on the weather and season. For example, the ion concentration tends to increase after the snow melts or after heavy rain.

  In addition, in a water supply plant that treats treated water taken from the water intake site, the amount and pH of the flocculant to be added can be adjusted based on the turbidity of the treated water according to seasonal variations. Has been done. The treated water (industrial water, tap water) treated at the water supply station has a residence time of, for example, about 12 to 24 hours before being supplied to a pure water use factory equipped with the pure water production apparatus 1, and the water quality fluctuates. There is a delay.

  The deionized water production apparatus 1 according to the third embodiment is disposed so as to contact the ion exchanger 3 at a preset position in the ion exchange tower 2, and continuously increases the resin conductivity of the ion exchanger 3. Conductivity meter 4 having at least one pair of electrodes to be measured, storage tank 23 capable of storing treated water of ion exchange tower 2, and water quality for obtaining quality information of treated water from a source of treated water The information acquisition means 12 (refer FIG. 14) and the supply control means 13 which control the supply to the ion exchange tower of to-be-processed water and the supply to the storage tank 23 of treated water based on water quality information are provided.

  For example, when it is assumed in advance that the quality of the water to be treated at the supply source will increase the load on the treatment of the pure water production apparatus 1 at the supply destination, the supply control means 13 is provided with the ion exchange tower. Control is performed so that the treated water obtained in 2 is stored in the storage tank 23. Thereafter, when treated water having a lowered water quality is provided in the ion exchange tower 2, treatment according to the water quality is performed, or treatment of the treated water by the ion exchange tower 2, for example, as necessary. Stop. In the meantime, in the factory using the treated water (pure water) obtained in the ion exchange tower 2, the treated water stored in the storage tank 23 is used. Thereby, since the ion exchange treatment conditions in the ion exchange tower 2 can be adjusted in a state where a predetermined amount of pure water used in a pure water use factory is always secured, a more efficient treatment can be performed. .

  Therefore, for example, the water quality information acquisition means 12 shown in FIG. 14 receives water quality information (ion) from the supply source of the treated water via the network 100 (see FIG. 13) connected to the computer 100 and the computer provided in the water purification plant. Load, conductivity, chemical usage, turbidity, etc.). The water quality information acquisition means 12 provided in the computer 100 determines the processing conditions of the ion exchange tower 2 based on the water quality information of the to-be-treated water that will be supplied in the future acquired via the network 200.

  For example, when supply of water to be treated whose ion load is higher than usual is predicted, the water quality information acquisition means 12 is pure water produced at the timing when the water to be treated having low ion load at the previous stage is supplied. Is stored in the storage tank 23, and the processing conditions of the ion exchange tower 2 are determined. Based on the processing conditions determined by the water quality information acquisition unit 12, for example, in the case of treated water with good water quality in the future, the supply control unit 13 performs a normal pure water production process using the ion exchange tower 2 in the future. If the water to be treated is not good in quality, the treated water is controlled to be supplied to the storage tank 23 before the water to be treated is supplied.

  According to the pure water production apparatus 1 according to the third embodiment, the pure water production apparatus 1 includes the water quality information acquisition unit 12 that acquires the water quality information of the supply source of the treated water via the network 200 or the like. As compared with the case where the load fluctuation of the water to be treated is monitored at the inlet of the water, the load fluctuation of the water to be treated can be predicted at an early stage. As a result, more efficient pure water production processing can be performed, and the processing load on the ion exchange tower 2 can be reduced.

  Furthermore, by providing a conductivity meter 4 and anomaly detection means 11 that can directly measure the resin conductivity of the ion exchanger in the ion exchange column 2, the state in the ion exchange column 2 can be kept pure while maintaining a more optimal state. Since the production process of water can be performed, it is possible to grasp the deterioration of the quality of the treated water and abnormality in the ion exchange tower 2 at an earlier stage.

  In addition, when the conductivity of the water to be treated acquired by the water quality information acquisition unit 12 is too high or too low than usual due to water quality fluctuations, there is a possibility that the measurement of the conductivity meter 4 may be affected. The treated water from the anion tower 50 is supplied to the cation tower 30, the decarboxylation tower 40, and the anion tower 50 through the circulation means 80 provided in the pure water producing apparatus 1 according to the second embodiment, and the conductivity of the water to be treated. Is adjusted to an appropriate range for the measurement of the conductivity meter 4, thereby improving the measurement accuracy of the conductivity meter 4 and performing a more suitable pure water production process.

  FIG. 15 is a table showing a comparison of chemical costs when pure water production is performed using the pure water production apparatus 1 according to the third embodiment (upper column) and when pure water production is not performed (lower column). . According to the pure water manufacturing apparatus 1 according to the third embodiment, the amount of chemicals can be further reduced to perform a highly pure water manufacturing process.

(Fourth embodiment)
FIG. 16 is a schematic diagram illustrating a water treatment system according to the fourth embodiment of the present invention. The water treatment system includes a plurality of pure water use plants A to C including a pure water production apparatus 1 that produces pure water using an ion exchange tower 2 that passes treated water through an ion exchanger 3 to obtain treated water. including.

  The pure water production apparatus 1 includes a storage tank 23 and a computer 100, and is disposed so as to be in contact with the ion exchanger 3 at a preset position in the ion exchange tower 2, and the resin conductivity of the ion exchanger 3 is determined. A conductivity meter 4 comprising at least one pair of electrodes for continuous measurement is arranged. The computers 100 provided in the pure water use factories A to C are connected to a remote control server (remote control server means) 1000 and a computer 1001 via a network 200 so as to be able to communicate with each other.

  Each of the pure water production apparatuses 1 provided in the pure water use factories A to C can be controlled independently by the computer 100 provided therein, but the determination processing conditions determined by each computer are via the network 200. Can be transmitted to the remote control server means 1000.

  The remote control server means 1000 can optimize the processing conditions of the ion exchange tower 2 using a plurality of determination processing conditions transmitted from each of the pure water use factories A to C. For example, the regeneration frequency of the ion exchanger 3 used in the pure water use factories A to C and the flow rate of the treated water based on the abnormality detection information of the ion exchange tower 2 generated in the pure water use factories A to C, respectively. Processing conditions such as chemical amount can be recalculated. The remote control server means 1000 transmits processing condition update information obtained by recalculation to each of the pure water use factories A to C via the network 200.

  FIG. 17 is a schematic diagram illustrating an example of the pure water production apparatus 1 provided in each of the pure water use factories A to C. The pure water production apparatus 1 is arranged so as to be in contact with the ion exchanger 3 at a preset position in the ion exchange tower 2, and has at least one pair of electrodes for continuously measuring the resin conductivity of the ion exchanger 3. Based on the measurement result of the conductivity meter 4 provided and the conductivity meter 4 at a predetermined position, at least any of the amount of water to be treated supplied to the ion exchange tower 2, the amount of chemicals, and the regeneration frequency of the ion exchanger 3 Processing condition determining means 14 for determining a processing condition including the above and a transmitting means capable of transmitting the determination processing condition determined by the processing condition determining means 14 to the remote control server means 1000 that is communicably connected via the network 200 15 and receiving means 16 capable of receiving processing condition update information from the remote control server means 1000.

  The computer 100 provided in the pure water production apparatus 1 determines the processing conditions of each ion exchange column 2 by the abnormality detection means 11, the water quality information acquisition means, the supply control means 13, and the like described in the first to third embodiments. If the remote control server unit 1000 connected via the network 200 can collectively collect and share the information to be processed, the processing abnormality can be detected. More appropriate process control according to the process conditions can be performed.

  For example, between the pure water production apparatuses 1 of different types and treatment conditions, the ion exchange can be performed based on the use conditions and treatment conditions of the ion exchanger 3 without having to change the basic control conditions of each apparatus. If only specific processing conditions such as the regeneration frequency of the body 3 and the amount of the regenerative agent and the regeneration start command can be transmitted to each pure water production apparatus 1 via the remote control server means 1000, the on-site software is updated. In addition, it is possible to control the processing of each of the pure water use factories A to C from the remote control server means 1000, whereby the ion exchanger 3 can be processed with a more optimal regeneration frequency and amount of the regenerant, and the running cost is reduced. Thus, it is possible to suppress deterioration of the quality of pure water.

  According to the fourth embodiment of the present invention, the remote control server unit 1000 is determined by the processing condition determining unit 14 included in each of the plurality of pure water production apparatuses 1 that are communicably connected via the network 200. Based on the determined processing conditions, the processing conditions can be recalculated, and the processing condition update information obtained by the recalculation can be transmitted to each receiving means 16, so that only a specific command such as a resin regeneration command can be transmitted remotely. The control server means 1000 can transmit and a more efficient water treatment system is obtained.

  Although the present invention has been described with reference to the first to fourth embodiments, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments and operational techniques will be apparent to those skilled in the art. The present invention is expressed by the invention specifying matters in the scope of claims reasonable from the above disclosure, and can be modified and embodied in the implementation stage without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Pure water manufacturing apparatus 2 ... Ion exchange tower 3 ... Ion exchanger 4 ... Conductivity meter 8a ... Switching valve 11 ... Abnormality detection means 12 ... Water quality information acquisition means 13 ... Supply control means 14 ... Processing condition determination means 15 ... Transmission Means 16 ... Receiving means 21 ... Inlet 22 ... Outlet 23 ... Storage tank 30 ... Cation tower 40 ... Decarbonation tower 50 ... Anion tower 80 ... Circulating means 100 ... Computer 110 ... Storage device 111 ... Detector 112 ... Determination part 113 ... Output Unit 120 ... input means 130 ... output means 200 ... network 1000 ... remote control server means 1001 ... computer

Claims (9)

A pure water production apparatus for producing pure water using an ion exchange tower for passing treated water through an ion exchanger to obtain treated water,
A conductivity meter that is disposed in contact with the ion exchanger at a preset position in the ion exchange tower and includes at least one pair of electrodes that continuously measure the resin conductivity of the ion exchanger;
Based on the measurement result of the conductivity meter at the position, a change in the measured value of the resin conductivity due to adsorption or desorption of a plurality of ions passing through the ion exchange tower to the ion exchanger is detected. An abnormality detection means for generating an abnormality detection signal for warning the occurrence of an abnormality when a change in the measured value of the resin conductivity due to ions affecting the water quality of the treated water is detected. A pure water production system. The ion exchange tower is a cation tower,
The abnormality detection means is
When the measured value of the resin conductivity is lower than a preset first set value, a first abnormality detection signal is generated,
2. The pure water according to claim 1, wherein the second abnormality detection signal is generated when the measured value of the resin conductivity falls below a second set value lower than the first set value. Manufacturing equipment. The ion exchange tower is a cation tower,
3. The apparatus for producing pure water according to claim 1, wherein the abnormality detection unit generates the abnormality detection signal when a change in the resin conductivity due to calcium ions is detected. The pure water production apparatus comprises a cation tower, a decarboxylation tower and an anion tower,
When the abnormality detection means generates the abnormality detection signal based on the measured value of the resin conductivity by the conductivity meter provided in the cation tower, at least a part of the treated water of the anion tower is The pure water production apparatus according to any one of claims 1 to 3, further comprising a circulation means for circulation to the cation tower. The ion exchange column is an anion column,
The abnormality detection means detects the abnormality when a change in the measured value of the resin conductivity changes from a decreasing tendency to an increasing tendency, and the increasing tendency of the measured value of the resin conductivity continues for a preset time or more. The pure water manufacturing apparatus according to claim 1, wherein the signal is generated. The ion exchange column is an anion column,
The pure water production apparatus according to claim 1 or 5, wherein the abnormality detection means generates the abnormality detection signal when a change in the resin conductivity due to silica ions is detected.   The pure water according to any one of claims 1 to 6, wherein the pair of electrodes are disposed downstream of the middle of the inlet and outlet of the ion exchange tower with respect to the direction of water flow of the treated water. Manufacturing equipment. A pure water production apparatus for producing pure water using an ion exchange tower for passing treated water through an ion exchanger to obtain treated water,
A conductivity meter provided with at least one pair of electrodes that are arranged in contact with the ion exchanger at a preset position in the ion exchange tower and continuously measure the resin conductivity of the ion exchanger. An ion exchange tower,
A storage tank capable of storing the treated water;
Water quality information obtaining means for obtaining water quality information of the treated water from a supply source of the treated water;
A pure water production apparatus comprising: supply control means for controlling supply of the treated water to the ion exchange tower and supply of the treated water to the storage tank based on the water quality information. A pure water production apparatus for producing pure water using an ion exchange tower for passing treated water through an ion exchanger to obtain treated water,
A conductivity meter provided with at least one pair of electrodes that are arranged in contact with the ion exchanger at a preset position in the ion exchange tower and continuously measure the resin conductivity of the ion exchanger. An ion exchange tower,
Processing for determining processing conditions including at least one of the amount of water to be treated supplied to the ion exchange tower, the amount of chemicals, and the regeneration frequency of the ion exchanger based on the measurement result of the conductivity meter at the position Condition determining means;
A transmission unit capable of transmitting the determination processing condition determined by the processing condition determination unit to a remote control server unit connected to be communicable;
Receiving means capable of receiving processing condition update information from the remote control server means,
The remote control server means includes a plurality of determination processing conditions determined by the processing condition determination means provided in each of the plurality of pure water production apparatuses including the ion exchange column including a conductivity meter including the at least one pair of electrodes. The processing condition update information obtained by recalculating the processing condition based on the recalculation is transmitted to the receiving means.