JP2816160B2 - Ion analysis method and ion analyzer - Google Patents

Description

The present invention is suitable for measuring the type and concentration of ions such as impurity ions in water, particularly high-temperature water, in a chemical plant or a nuclear power plant using high-temperature water. The present invention relates to a simple ion analysis method and an ion analysis device.

[Conventional technology]

Conventionally, the concentration of boric acid and lithium hydroxide in the primary cooling water of a pressurized water reactor (PWR), pH concentration and electrical conductivity are automatically measured by the change in conductivity before and after adding mannitol to the cooling water. See 1988 “JA
IF International Conference on Water Chemistry in Nuclear Power Plants Proceedings, ”pp. 616-621 (1988 J
AIF Int'l Conf.on Water Chemistry in Nuclear Power
Plants pp616-621).

[Problems to be solved by the invention]

The above prior art considers monitoring the concentration of ions generated from impurities such as H ₂ SO ₄ , NaOH, NaCl, and HNO ₃ which are the measurement targets in the primary cooling system of a boiling water reactor (BWR). Did not. In addition, there is a method using ion chromatography as a method for measuring these ion concentrations.However, a method using ion chromatography takes a long time for one analysis and can obtain continuous measurement values such as online measurement. There is a disadvantage that it cannot be done.

An object of the present invention is to provide an ion analysis method and an ion analysis apparatus capable of continuously measuring an ion concentration required for finely controlling the quality of high-temperature water.

[Means for Solving the Problems] To achieve the above object, the ion analysis method of the present invention comprises the steps of: (A) measuring room temperature conductivity at room temperature of water to be measured and high temperature conductivity at a higher temperature than the room temperature; (B) determining the type and concentration of a plurality of ions in the water to be measured by chemical analysis, and determining the relationship between the room temperature conductivity measured in (A) and each ion concentration; (C) the (A) A) examining the presence or absence of a change in the ionic composition in the water to be measured based on the presence or absence of a temporal change in the ratio of the room temperature conductivity and the high-temperature conductivity measured in (d); In this case, a step of obtaining each ion concentration using the room temperature conductivity measured in the above (A) and the relationship between the room temperature conductivity obtained in the above (B) and each ion concentration, (E) in the above (C) When there is a change in the ion composition, From the time-dependent change in the relationship between the water temperature conductivity and each ion concentration obtained in (B), the relationship between the room temperature conductivity and each ion concentration at the time when the room temperature conductivity was measured in the above (A) was predicted. A step of predicting each ion concentration using the relationship between the conductivity and each ion concentration and the room temperature conductivity measured in the above (A); (F) each ion concentration predicted in the above (E); The high-temperature conductivity is predicted using the temperature dependency of the conductivity, and when the difference between the predicted high-temperature conductivity and the high-temperature conductivity measured in (A) is equal to or less than a reference value, the prediction is performed in (E). (G) when the difference in the high-temperature conductivity is larger than a reference value in (F), the relationship between the room temperature conductivity predicted in (E) and each ion concentration is determined. Corrected, and the relationship between the corrected room temperature conductivity and each ion concentration, and (A) E) predicting each ion concentration by using the room temperature conductivity measured in the above), and performing the above (F) using the predicted each ion concentration; Repeating (G) until the value becomes equal to or less than the reference value.

Further, the ion analyzer of the present invention comprises: (a) means for measuring room temperature conductivity at room temperature of water to be measured and high temperature conductivity at high temperature higher than the room temperature; Means for measuring the temperature of water; (c) chemical analysis means for measuring the type and concentration of ions in the water to be measured at room temperature; (d) based on the measured values measured by means (a) to (c) above. Calculating the relationship between the room temperature conductivity and each ion concentration, and examining the presence or absence of a temporal change in the ratio between the room temperature conductivity and the high temperature conductivity to determine whether or not the ion composition in the water to be measured fluctuates. In the case, the relationship between the calculated room temperature conductivity and each ion concentration, and each ion concentration is determined using the measured room temperature conductivity, and when there is a change in the ion composition, the calculated room temperature conductivity and each ion From the change over time in the concentration relationship, Predict the relationship between room temperature conductivity and each ion concentration at the time when the room temperature conductivity was measured, and use the predicted room temperature conductivity and each ion concentration, and the measured room temperature conductivity to calculate each ion concentration. Predicting, using the predicted ion concentration and the temperature dependency of the conductivity of each ion, to predict a high-temperature conductivity, and a difference between the predicted high-temperature conductivity and the measured high-temperature conductivity being equal to or less than a reference value. In the case of, it is determined that each of the predicted ion concentrations is correct, and when the difference between the high-temperature conductivity is larger than a reference value, the relationship between the predicted room temperature conductivity and each ion concentration is corrected, and the corrected room temperature is corrected. Predicting each ion concentration using the relationship between the conductivity and each ion concentration and the measured room temperature conductivity, and using the predicted each ion concentration and the temperature dependence of the conductivity of each ion to conduct high-temperature conduction. Rate, and the predicted high temperature Until the difference between the electrical conductivity and the measured high-temperature electrical conductivity is equal to or less than a reference value, an arithmetic processing unit that repeats processing after correction of the relationship between the predicted room-temperature electrical conductivity and each ion concentration, and (e) the (d) unit Display means for displaying each ion concentration obtained in the step.

[Action]

In the present invention, the room temperature conductivity and the high temperature conductivity of the measured water are measured, and the relationship between each ion concentration quantified by chemical analysis and the room temperature conductivity is obtained. Furthermore, the presence or absence of a change in the ionic composition is examined based on whether or not the ratio of the room-temperature conductivity to the high-temperature conductivity changes with time.If there is no change in the ionic composition, the relationship between each ion concentration and the room-temperature conductivity and the measured low-temperature conductivity are measured. The ion concentration can be determined using the ratio.

When there is a change in the ion composition, the relationship between the room temperature conductivity and each ion concentration at the time when the room temperature conductivity is measured is predicted, and further, each ion concentration and the high-temperature conductivity are predicted based on this relationship. When the difference between the predicted high-temperature conductivity and the measured high-temperature conductivity is equal to or smaller than the reference value, it is determined that the predicted ion concentrations are correct, and the respective ion concentrations can be obtained.

If the difference in the high-temperature conductivity is larger than the reference value, by repeating the process of correcting the relationship between the predicted room temperature conductivity and each ion concentration until the difference becomes equal to or less than the reference value, the correct ion concentration can be calculated from the predicted ion concentration. You can ask.

Therefore, it is possible to continuously measure the ion concentration in the high-temperature water that is the water to be measured.

〔Example〕

Example 1 FIG. 1 is a diagram showing a basic configuration of a continuous analyzer for ionic components used in the present invention. The measuring device includes a room temperature conductivity meter 1 and a temperature sensor 2 for measuring the temperature of the water to be measured, a high temperature conductivity meter 3 and a temperature sensor 2 for measuring the temperature of the water to be measured, and an ion concentration measuring device 4. An analysis device 5 for continuously calculating an ion concentration as an input and a display device 6 for displaying an analysis result and each measured value. In FIG. 1, only one high-temperature conductivity meter 3 is used, but two or more high-temperature conductivity meters can be measured at a plurality of temperatures. In this case, it is possible to accurately grasp the variation of each component of the ion, but the configuration of the apparatus becomes complicated.

In the present invention, the results of analysis and measurement are displayed using a display device. That is, various signals, the type and concentration of the evaluated ions, and a message such as an abnormality occurring in the measuring device are displayed, whereby the operator can easily know the change in the ion concentration and the failure of the device.

When these devices are applied to a chemical plant or the like using high-temperature water, they may be configured as shown in FIG. That is, the sampling line 9 is provided via the valve 8 from the flow path 7 through which the high-temperature water to be measured flows. A high-temperature conductivity meter 3 and a temperature sensor 2 for measuring the temperature of the measured water are provided downstream of the valve 8. On the downstream side, a cooler 10 for lowering the water temperature to room temperature is provided, and further on the downstream side, a room temperature conductivity meter 1, a temperature sensor 2 for measuring the water temperature, and an ion concentration measuring device 4 are sequentially arranged. The signals from the room temperature conductivity meter 1, the high temperature conductivity meter 3, the two temperature sensors 2, and the ion concentration measurement device 4 are all connected to the analysis device 5, and the analysis results are connected so as to be transferred to the display device 6.

When the hardware is set as described above, a continuous evaluation value of the target ion concentration can be obtained by performing data processing in the analyzer 5 according to the continuous ion concentration evaluation algorithm shown in FIG. become able to. That is, at time ti, the room temperature conductivity Kroom (t
Measure i) and high temperature conductivity Khigh (ti). If the time ti is the ion concentration measurement time, the identification of the ion species and the concentration Cm (ti)
And the contribution rate α of each ion species to the low-temperature conductivity Kroom
m (ti) is obtained and the process proceeds to the next step. If not, the process skips the ion concentration measurement process and proceeds to the next process. Next, the ratio of high-temperature conductivity to room-temperature conductivity Khigh (ti-a) / Kroo
Investigate the temporal variation of m (ti). Here, a indicates a time delay from when the measured water reaches the room temperature conductivity meter from the high temperature conductivity meter. If the variation of Khigh (ti−a) / Kroom (ti) is equal to or less than the reference value, it can be considered that the composition of the ion has not changed.
Cm (ti) can be obtained.

Cm (ti) = αm (tj) × Kroom (ti) (1) where Cm: concentration of ionic species m αm: contribution ratio of ionic species m to conductivity Kroom: measured value of room temperature conductivity ti : Time at which the room temperature conductivity was measured tj: Time at which the ion concentration closest to ti was measured On the other hand, when Khigh (ti−a) / Kroom (ti) changes with time, αm (ti−1) And time from αm (tj)
Predicted value αm of contribution rate of each ion species to conductivity at ti
Is extrapolated to obtain a predicted value Cm ^* of the concentration of each ion species from this αm by the following equation.

Cm ^* = αm × Kroom (ti) (2) where Cm ^{* is} a predicted value of the concentration of the ion species m.

αm: the contribution of the ionic species m to the conductivity. Predicted value for.

Based on Cm ^* thus obtained, a logical predicted value of the high-temperature conductivity is calculated according to the following equation.

Khigh ^* = ΣλmCm ^* (3) where Khigh ^* : predicted value of high-temperature conductivity λm: molar ionic conductivity at high temperature Next, Khigh * is compared with the measured Khigh (ti−a), and If the difference is equal to or less than the reference value, the concentration of each ion species at time ti can be obtained as Cm (ti) = Cm *. When | Khigh * −Khigh (ti−a) | is larger than the reference value, when Khigh * −Khigh (ti−a)> 0, the molar ionic conductivity at room temperature is small and the molar ionic conductivity at high temperature is small. The predicted value αn of the contribution rate of the large ion species n is reduced, and the operation returns to the expression (2) and the operation is continued, and conversely, Khigh * −Khi
When gh (ti−a) <0, αn is increased and the operation returns to the expression (2) to continue the operation. However, it is necessary to correct αm so as to maintain the charge balance of the entire ion species.
Since Cm (ti) is obtained by the above process, this value is displayed on a display device, and by repeating this value, a continuous value of ions can be obtained. In the correction, it is necessary to maintain the charge balance of the entire ion species.

With the above process, Cm (ti) is determined,
This value is displayed on a display device, and by repeating this, a continuous value of ions can be known.

FIG. 4 shows a high-temperature conductivity measuring device necessary for carrying out the present invention. In FIG. 4, reference numeral 11 denotes a measurement electrode, 12 denotes a liquid sample to be measured, 13 denotes a current / voltage measurement control device, 14 denotes an AC impedance analysis device related to a measurement electrode,
15 is an applied frequency control device, 16 is a lead wire, and 17 is a sample container. The AC voltage supplied from the analyzer 14 is
The voltage is applied to the measurement electrode 11 via the voltage measurement control device 13. The alternating current flowing between the measurement electrodes is measured by the current / voltage measurement controller 13 and sent to the analyzer together with the applied voltage signal to determine the complex impedance.

Next, an application frequency control method peculiar to the measuring device will be described in detail through a specific application example of the high-temperature conductivity measuring device. FIG. 5 shows a measurement electrode using two platinum electrodes having the same shape and surface condition fixed at a constant interval of 2 to 12 mm, and immersed in pure water at 15 ° C. and 300 ° C. This is a detailed analysis of AC impedance over a range of 1 Hz to 100 KHz. As a result, (1) that the electrode system can be approximated by the electric equivalent circuit shown in FIG. 6 over the entire temperature range from room temperature to 300 ° C., and (2) the obtained trajectory is calculated as shown in FIG. (3) However, as shown in FIG. 8, a temperature change of the electrode surface reaction resistance Rf and the value of the electrode capacitance C directly involved in the electrode surface reaction, as shown in FIG. It was found that the frequency required for direct measurement of the liquid resistance Rs became higher at higher temperatures. These results indicate that low-frequency alternating current around 10 KHz used in conventional room-temperature conductivity measurement is insufficient for measuring Rs at high temperature. On the other hand, measurement in a high-frequency range of 100 KHz or more has the following two problems. That is, the impedance caused by the capacitor and inductor components of the lead wire between the measurement electrode and the measurement device, that is,
In addition to a remarkable increase in noise, the frequency dependence of the liquid resistance cannot be ignored. Therefore, paying attention to the fact that the measured trajectory can be approximated as a substantially ideal semicircle or a part of a semicircle,
As shown below, the impedance at ω = 0 and ∞ can be estimated with sufficient accuracy from a part of the trajectory by using the applied frequency control device 13 shown in FIG. FIG. 9 shows a control process in the applied frequency control device 13 of FIG.

First, the scanning direction of the frequency is sequentially performed from the high frequency side to the low frequency side. Scanning is terminated at the frequency at which the value of the imaginary part of the complex impedance at each frequency is successively compared with the previous measured value to confirm that the absolute value of the imaginary part has reached the maximum value.
The maximum value is [Im (Z)] max, and the value of the real part at this time is [Re
(Z)] o, and the measurement frequency is ωmax, the liquid resistance Rs = [Re (Z)] o- [Im (Z)] max can be obtained.

FIG. 10 shows the temperature change of the pure water conductivity obtained by the method of the present invention in comparison with the theoretical calculation result based on the degree of water dissociation.
Both agreed with an error of ± 5%, confirming the validity of this measurement method.

Second Embodiment In the first embodiment described above, all the measured water is drained. However, the configuration shown in FIG. 11 can reduce the amount of drain water. That is,
The sampling line 9 is connected to the valve 8 from the flow path 7 of the measured water.
Through the high temperature conductivity meter 3, temperature sensor 2, cooler
Arrange in the order of 10. On the downstream side, a sampling line is further branched for ion concentration measurement, and the ion concentration measuring device 4 is arranged downstream. Downstream of the branch point of the main sampling line, a pump 34, a room temperature conductivity meter 1, a temperature sensor 2, and a heater 21 are arranged in this order.
The mechanism is connected to However, the branch point of the sampling line used for measuring the ion concentration may be downstream of the room temperature conductivity meter 1 as long as it is before the heater 21, and the measurement positions of the temperature sensor 2 and the conductivity meter may be very close. It is not a problem before and after. Further, when the sampling flow rate is extremely smaller than the flow rate of the main flow path 7, the heater 22 can be omitted. With such a device configuration and arrangement, the amount of drain water can be reduced.

Example 3 Example 2 relates to a measuring method and apparatus when the conductivity meter, the temperature sensor, and the ion concentration measuring apparatus are all operating normally. In the present embodiment, a method for self-detecting abnormality of each sensor and measuring device will be described. FIG. 12 shows the temporal change of the room temperature conductivity, the high temperature conductivity, and the ratio thereof. FIG. 12 shows a case where the ion concentration increases and the conductivity increases. In the normal case shown in (A), the high-temperature conductivity Khigh increases at time t, and the room-temperature conductivity at time t + a elapses by a time delay a until the measured water reaches the room-temperature conductivity meter from the high-temperature conductivity meter. The rate Kroom will also increase. Khi at this time
The change in the value of gh / Kroom will show a pattern that increases at time t and decreases at t + a. When the room temperature conductivity meter shown in FIG. 3B fails, the value of Khigh / Kroom does not decrease because the room temperature conductivity Kroom does not change at time t + a. Further, as shown in (C), when the high-temperature conductivity meter fails, only a decrease in Khigh / Kroom is seen at time t + a. In other words, if the value of Khigh / Kroom changes once and no change occurs after a time elapses, it can be understood that one of the conductivity meters has failed. Which of the failures can be determined from the temporal change of the measured value of the ion concentration as a failure of the room-temperature conductivity meter if the conductivity should be increased, and a failure of the bone sound conductivity meter if the reverse is the case. . If the density obtained from the ion concentration measuring device does not change when the value of Khigh / Kroom indicates a normal pattern, the ion concentration measuring device has failed. The failure of the temperature sensor can be confirmed by confirming that the value of the conductivity and the value of Khigh / Kroom do not change when the indicated value of the temperature changes. It is based on the fact that the conductivity changes when the temperature changes. Up to this point, a single failure check method has been used, but a complete self-check cannot be performed for a plurality of failures. However, the ion concentration from the ion concentration measurement device
The consistency is checked by comparing the conductivity derived from the following two formulas with the measured value using Cm (t) and the molar ionic conductivity, and when it is significantly impaired, it is determined that an abnormality has occurred somewhere. it can.

Kroom ^* (t) = Σλm′Cm (t) (4) Khigh (t) = ΣλmCm (t) (5) where λm ′: molar ionic conductivity at room temperature λm: molar ionic conductivity at high temperature ^* (T): Calculated value of room temperature conductivity at time t Khigh (t): Calculated value of high temperature conductivity at time t By providing the self-check function as described above, the reliability of the obtained ion concentration is increased. .

Embodiment 4 This embodiment relates to a display of a continuous analyzer for ion components. FIG. 13 shows an example of an ion concentration display screen in a normal case. The ratio of high-temperature conductivity to room-temperature conductivity Khigh (ti-a) /
The time change of Kroom (ti) and the current ion type and concentration are displayed in real time. If there is an ion exceeding the management target value, the color of the character of the ion type name is changed from the normal color to display it so as to notify the operator. In addition, the history of the temporal change of each of the conductivity and the ion concentration is displayed by the selection of the operator. When an abnormality occurs in the sensor or the like, the display screen is cleared, and then an abnormal message is displayed together with a buzzer sound.

With the above series of displays, the water quality management operator can easily grasp the water quality and recognize the abnormality.

Embodiment 5 This embodiment is an example of a case where the continuous analyzer for ionic components is used in combination with a diagnostic device having a knowledge base on a device using the water to be measured. FIG. 14 is a diagram showing a system configuration when a continuous analyzer for ion components and a diagnostic device are combined with a boiling water reactor. The flow of water in the primary system of the boiling water reactor is turned into water in the condenser 27 after turning the turbine 26 with high-temperature and high-pressure steam, and the condensate water purification device 28 removes most of the impurities contained therein. Is done. The water leaving the purification device is pressurized by a feedwater pump, heated by a feedwater heater, and guided to the reactor pressure vessel 33. From the reactor pressure vessel, there is a recirculation line that passes through the recirculation pump and mostly returns to the reactor pressure vessel 23.
After the impurities are removed through 32, it returns to the water supply line. Among them, the high-temperature and high-pressure water is after the outlet of the feed water heater 30. Therefore, in order to monitor the water quality of the primary system of the reactor, the installation location of the continuous ion component analyzer
The position where the sampling line is drawn from the outlet and the high temperature portion on the upstream side of the inlet of the reactor water purification device 32 is appropriate. The ion concentration of these two ion components obtained from the continuous analyzer 23 is guided to the diagnostic device 24, and is compared with various kinds of knowledge stored in the knowledge base 25 to obtain a diagnostic result. As an example of the diagnosis, for example, the fact that the iron concentration in the feedwater is decreasing and the nickel concentration in the reactor water is increasing is measured by the continuous ion measuring device 23, and as a past experience, Since the fact that the radiated cobalt concentration becomes higher in the knowledge base 25 exists in the knowledge base 25, it can be known that the reactor water radioactivity may be increased as a result of the diagnosis.

As described above, the ion continuous measurement device 23 is connected to the knowledge base 25.
In combination with the diagnostic device 24 having the above, more useful information can be provided to the water quality management operator.

In the present invention, if the non-electrolyte substance can be changed to appropriate ions, the ion continuous measurement apparatus can be used as a continuous measurement apparatus for the non-electrolyte substance.

〔The invention's effect〕

According to the present invention, since the type and concentration of ions in high-temperature water can be continuously measured, it is possible to detect a change in water quality at an early stage and take a countermeasure, and perform fine water quality management. .

[Brief description of the drawings]

FIG. 1 is a view showing the configuration of an apparatus according to an embodiment of the present invention, FIG. 2 is a layout view of the apparatus during operation, FIG. 3 is a view showing an ion concentration evaluation algorithm, and FIG. Fig. 5 shows the basic device configuration of the measuring device used in Fig. 5. Fig. 5 shows the frequency response of the electrode impedance when the platinum electrode was immersed in pure water in the range of 1Hz to 100KHz. FIG. 6 is a diagram showing the electrical equivalent circuit of the side fixed electrode estimated from the result of the frequency response analysis of the electrode impedance, and FIG. 7 is a diagram showing the theoretical AC impedance of the electrical equivalent circuit of the measuring electrode. A diagram showing a frequency response locus,
FIG. 8 is a diagram showing a temperature change of a measurement electrode surface reaction resistance and an electrode capacitance, FIG. 9 is a diagram showing stepwise control contents in the application frequency control device shown in FIG. FIG. 11 is a diagram comparing the measurement results obtained when the present invention is applied to the measurement of pure water conductivity with theoretical calculation results, and FIG.
FIG. 12 is a diagram showing a modification of the diagram, FIG. 12 is a diagram showing a change pattern of room temperature conductivity and high temperature conductivity and a ratio thereof, FIG. 13 is a diagram showing a display screen, and FIG. FIG. 2 is a system configuration diagram when a continuous measurement device and a diagnostic device are incorporated. 1 ... room temperature conductivity meter, 2 ... temperature sensor, 3 ... high temperature conductivity meter, 4 ... ion concentration measurement device, 5 ... analysis device,
6 ... display device, 7 ... main flow path of water to be measured, 8 ... valve, 9 ... sampling line, 10 ... cooler, 11 ...
Measurement electrode, 12 liquid sample, 13 current and voltage measurement control device, 14 AC impedance analysis device, 15 applied frequency control device, 16 lead wire, 17 sample container, 18
…… Platinum electrode, 19 …… Spacer, 20 …… Platinum wire, 21 ……
Heater, 22 check valve, 23 continuous ion measuring device, 24
…… Diagnostic device, 25 …… Knowledge base, 26 …… Turbine, 27
…… Condenser, 28 …… Condenser purification device, 29 …… Water supply pump,
30 ... feed water heater, 31 ... recirculation pump, 32 ... reactor water purification device, 33 ... reactor pressure vessel, 34 ... pump.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayoshi Kondo 1168 Moriyama-cho, Hitachi City, Ibaraki Prefecture Inside Energy Laboratory, Hitachi, Ltd. (72) Inventor Shunsuke 1168 Moriyama-cho, Hitachi City, Ibaraki Prefecture Energy Research, Hitachi, Ltd. (56) References JP-A-52-137594 (JP, A) JP-A-59-60293 (JP, A) JP-A-64-53146 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) G01N 27/00-27/10

Claims (7)

(57) [Claims] 1. An ion analysis method for measuring the concentration of a plurality of ions in water to be measured, comprising: (A) measuring room temperature conductivity at room temperature of the water to be measured and high-temperature conductivity at a high temperature higher than the room temperature; (B) a step of obtaining the type and concentration of a plurality of ions in the water to be measured by chemical analysis and obtaining a relationship between the room temperature conductivity measured in (A) and each ion concentration; (C) measuring in (A) Examining the presence or absence of a change in the ionic composition in the water to be measured based on whether or not the ratio of the room-temperature conductivity to the high-temperature conductivity has changed with time; (D) when there is no change in the ionic composition in (C), A step of obtaining each ion concentration by using the room temperature conductivity measured in (A) and the relationship between the room temperature conductivity and each ion concentration obtained in (B); and (E) the ion composition in (C). When there is a fluctuation of (B) The relationship between the room temperature conductivity and each ion concentration at the time when the room temperature conductivity was measured in the above (A) was predicted from the temporal change in the relationship between the room temperature conductivity and each ion concentration obtained in the above. A step of predicting each ion concentration using the relationship between each ion concentration and the room temperature conductivity measured in the above (A); and (F) a step of estimating each ion concentration predicted in the above (E) and the conductivity of each ion. The high-temperature conductivity is predicted using the temperature dependency, and when the difference between the predicted high-temperature conductivity and the high-temperature conductivity measured in (A) is equal to or less than a reference value, each ion predicted in (E) is used. Determining that the concentration is correct; (G) correcting the relationship between the room temperature conductivity predicted in (E) and each ion concentration when the difference in the high-temperature conductivity is larger than a reference value in (F); The relationship between the corrected room temperature conductivity and each ion concentration and the above (A) Estimating each ion concentration using the determined room temperature conductivity, and performing the above (F) using the estimated each ion concentration; (H) the difference in the high temperature conductivity in the (F) is a reference value. Repeating the above (G) until the following is achieved. 2. A high-temperature water flow path for measuring an ion concentration, wherein a flow path for measurement is branched, and a high-temperature conductivity meter, a cooler, a room temperature conductivity meter, and an ion concentration measurement are provided from the upstream side. An ion analysis method characterized by being arranged and used in the order of devices. 3. The method according to claim 2, wherein the water to be measured by the ion concentration measuring device is collected by branching from a downstream side of the cooler, and the water having only the measured conductivity is returned to the high-temperature water flow path. Characteristic ion analysis method. 4. The apparatus according to claim 2, wherein when the ion concentration in the water to be measured changes, the time of arrival of the water to be measured at each measuring device, the ratio of the room temperature conductivity to the high temperature conductivity, and the ion concentration measuring device. An ion analysis method characterized by having a function of self-diagnosing that each measuring device is operating normally from a measured value obtained from (1). 5. The ion as claimed in claim 4, wherein when an abnormality of the measuring device is found by the self-diagnosis, the name of the measuring device diagnosed as abnormal is displayed on a display device or an alarm is issued. Analysis method. 6. The method according to claim 1, wherein during the measurement of the ion concentration,
An ion analysis method characterized by displaying, on a display device, a history of a ratio between room-temperature conductivity and high-temperature conductivity, and evaluation values of ion types and concentrations. 7. An ion analyzer for measuring the concentration of a plurality of ions in water to be measured, comprising: (a) means for measuring room temperature conductivity at room temperature of the water to be measured and high-temperature conductivity at a high temperature higher than the room temperature; (B) means for measuring the temperature of the measured water measuring the conductivity; (c) chemical analysis means for measuring the type and concentration of ions in the measured water at room temperature; (d) the above (a) to (a). c) Calculate the relationship between room temperature conductivity and each ion concentration based on the measurement value measured by the means, and change the ion composition in the pre-measurement water depending on whether the ratio of room temperature conductivity to high temperature conductivity changes with time. If there is no change in the ion composition, the relationship between the calculated room temperature conductivity and each ion concentration and the measured room temperature conductivity are used to determine each ion concentration, and the change in the ion composition is In some cases, the calculated room temperature The relationship between the room temperature conductivity and each ion concentration at the time when the room temperature conductivity was measured was predicted from the temporal change in the relationship between the electrical conductivity and each ion concentration, and the relationship between the predicted room temperature conductivity and each ion concentration at the time when the room temperature conductivity was measured, and Predicting each ion concentration using the measured room temperature conductivity, predicting high-temperature conductivity using the predicted ion concentration and the temperature dependence of the conductivity of each ion, and calculating the predicted high-temperature conductivity. If the difference between the measured high-temperature conductivity is equal to or less than a reference value, it is determined that the predicted ion concentration is correct, and if the difference between the high-temperature conductivity is greater than the reference value, the predicted room temperature conductivity and The relationship between each ion concentration is corrected, each ion concentration is predicted using the corrected room temperature conductivity and each ion concentration, and the measured room temperature conductivity. Temperature dependence of the electrical conductivity of Until the difference between the predicted high-temperature electrical conductivity and the measured high-temperature electrical conductivity becomes equal to or less than a reference value, and repeats the processing after correction of the relationship between the predicted room-temperature electrical conductivity and each ion concentration. An ion analyzer comprising: an arithmetic processing means; and (e) a display means for displaying each ion concentration obtained by the (d) means.