JPH05264538A - Water quality diagnostic apparatus for plant - Google Patents

Abstract

PURPOSE:To provide a water quality diagnostic apparatus which adapted to diagnose a cause and a counter measure automatically by achieving an early discovery of abnormal state of quality of water circulating through a water circulation system at a thermal power plant. CONSTITUTION:A water quality diagnostic apparatus has a water quality detection means 1 which comprises a hydrazine meter, a total iron meter, a turbidometer, an arithmetic iron system, a chlorine ion meter, a conductivity meter, a pH meter, a dissolved oxygen meter, a sodium meter and a dissolved hydrogen meter, a memory means for storing a water quality data to be outputted from the water quality detection means 1, a diagnosis processing means 8 which inputs data to be outputted from a process signal generation means 3 and the water quality detection means 1 while inputting the previous water quality data from a first memory means 9 and performs a diagnosis for operation assistance and a cause of an abnormal water quality in the operation of the power plant to display the contents thereof and a display device 12 to display the results of the diagnosis in a water circulation system comprising a water supply system. a steam system and a condenser system in a thermal power plant. This enables automatic diagnosis of the water quality in the water circulation system of the thermal power plant automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality diagnostic device for a plant.

[0002]

2. Description of the Related Art Conventionally, in a thermal power plant, steam is jetted to a turbine connected to a generator to rotate the turbine, and the steam that has completed the work of rotating the turbine is cooled. Then, the returned water is passed through an ion exchange resin to remove the ionic substances and degassed, and the clean water from which the ionic substances and dissolved oxygen have been removed is heated again with a boiler to form steam. It has a water circulation system in which steam is jetted again to the turbine. Here, the steam is usually cooled with seawater.

An important factor in the water circulation system in such a thermal power plant is the control of the quality of circulating water. That is, if the quality of the circulating water is poor, the boiler, turbine, piping, etc. will be corroded and the life of the water circulating system will be shortened.

Therefore, as the quality control of water in the water circulation system in the conventional power plant, the conductivity of water, the pH of water, the concentration of dissolved oxygen in water, the concentration of hydrazine, the concentration of dissolved hydrogen in water, the concentration of total iron in water, etc. ,
Control of turbidity of water, chlorine concentration in water, concentration of sodium ion in water and the like can be mentioned.

Such quality control of water is particularly necessary not only during the operation of the thermal power plant but also when the thermal power plant is once stopped and then restarted.
During the operation of a thermal power plant, when a quality deterioration of circulating water is found, it is necessary to promptly investigate the cause of the quality deterioration of the circulating water in order to quickly prevent the corrosion of the piping and the boiler. When restarting the operation of a thermal power plant that had been stopped, the water circulation system was replaced with normal circulating water, and the circulation system that may have been generated by accumulated water that had accumulated in the circulation system while the operation was stopped This is because it is necessary to promptly find the defective part inside and repair it.

Controlling the conductivity of the water to meet such needs is to monitor the possibility that seawater used to cool the steam may enter the water circulation system. This is because if seawater is mixed in the circulating water, the concentration of ionic substances such as chlorine ions should rise, and if the concentration of ionic substances rises, the conductivity of the circulating water should rise. In addition, the pH of water described below
This is because the ammonium ion can be detected in combination with the above-mentioned monitoring.

The pH of water is monitored by the pH of circulating water.
Is to prevent the corrosion of iron by keeping it weakly alkaline, and to monitor the dissolved oxygen concentration in water is to prevent the corrosion of pipes, boilers, turbines, etc. Monitoring is for monitoring the presence of dissolved oxygen in the circulating water, such as by checking the extent of consumption of hydrazine added for deoxygenation from the circulating water. Monitoring the concentration of dissolved hydrogen in water can be used for diagnosing abnormal conditions such as the occurrence of corrosion in turbines. Monitoring the total iron concentration in water and the turbidity of water can detect the presence or absence of scale formation. Monitoring chlorine concentration in water and sodium ion concentration in water can check the contamination of seawater.

For such water quality control items, data obtained by detectors arranged at various places in the water circulation system are displayed on an instrument provided on the wall surface of a centralized monitoring device and recorded in a recording device. Was there.

The supervisor discovers abnormal data from the various detected data displayed on the instrument, comprehensively judges the various abnormal data, detects the cause of the abnormal occurrence, the location of the abnormal occurrence, etc. Was there. However, in a monitoring method that relies on the experience of such an observer, even if it is possible to detect an abnormal state, it takes time to detect the location of the abnormal occurrence, investigate the cause of the abnormal occurrence, or consider how to deal with it, and However, there is a problem that you have to rely on a skilled observer.

The present invention has been completed based on the above circumstances. That is, the object of the present invention, based on real-time water quality data detected in each part of the water circulation system in the thermal power plant and the water quality data accumulated in a certain period, the cause of the abnormal state occurrence in the power plant operation and its countermeasures. Another object of the present invention is to provide a plant water quality diagnostic device capable of performing automatic diagnosis and promptly notifying an operator of a thermal power plant.

[0011]

[Means for Solving the Problems]
The configuration of the present invention for supplying water in a thermal power plant
System, steam system and condensate system
Meter, total iron meter, turbidity meter, calculation iron system, chlorine ion
Meter, conductivity meter, pH meter, dissolved oxygen meter, sodium meter and
And a water quality detection means consisting of a dissolved hydrogen meter
Storage means for storing water quality data output from the
Data output from the signal generator and the water quality detector.
Data and input past water quality data to the first storage means.
Input from the
Diagnose the cause of constant water quality and display its contents
In this way, the diagnostic processing means that processes the data and the diagnostic results are displayed.
Of a plant characterized by having a display device shown
It is a water quality diagnostic device.

[0012]

Since the water quality diagnostic device of the present invention has the above-mentioned configuration, it detects the hydrazine concentration, iron content, chloride ion concentration, conductivity, pH, dissolved oxygen concentration, sodium concentration and dissolved hydrogen concentration in the circulating water in real time. However, from these real-time data and past accumulated data for a certain period of time, the water quality of each part in the water circulation system, the history of water quality, the operation support for the real-time power plant in the circulation system and the cause of the occurrence of abnormal conditions can be determined. Can be diagnosed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to the drawings.

An outline of an example of a thermal power plant to which the water quality diagnostic apparatus of the present invention is applied is shown in FIG.

(A) Water Circulation System in Thermal Power Plant-Structure of Water Circulation System-As shown in FIG. 1, the condensate system condenses the steam that has finished its work in a cooling pipe ST that conducts seawater to form a liquid. A steam condensing device C for converting into water, a condensed water storage tank HW for storing condensed water, a condensate pump CP for supplying water discharged from the condensed water storage tank HW, and a condensate pump CP for supplying water. Condensate demineralizer DEMI that removes ionic substances in water with an ion exchange resin, condensate booster pump CBP that sends water (demineralized water) from which ionic substances have been removed, and low pressure that heats the sent water. It has a heater LPHTR, a deaerator DEA for removing oxygen from the warm water heated by the low-pressure heater LPHTR, and a pipe connecting these in series. In addition, distilled water is supplied from the makeup water tank T to the condensed water storage tank HW through a pipe.

Further, in this condensate system, a first valve V ₁ is provided in a branch pipe branching from a pipe connecting the condensate pump CP and the condensate demineralizer DEMI, and the condensate pump CP and the condensate demineralizer are provided. A second valve V ₂ is provided on a side pipe that bypasses the condensate demineralizer DEMI from a pipe connecting the device DEMI, the condensate booster pump CBP and the low pressure heater LP.
A third valve V ₃ is provided on the side pipe returning from the pipe connecting with the HTR to the condensed water storage tank HW, and a fourth valve V ₄ is provided on the pipe branching from the deaerator DEA.
A fifth valve V ₅ is provided on the side pipe returning from the pipe connecting A and the high-pressure heater HPHTR to the condensed water storage tank HW.

In the pipe connecting the condensate demineralizer DEMI and the condensate booster pump CBP, an ammonia injection pipe (not shown) for injecting ammonia into the water circulation system and a hydrazine injection for injecting hydrazine into the water circulation system are provided. A tube (not shown) is connected. The water supply system preheats the high-pressure water pump BFP that produces high-pressure water by sending the water discharged from the deaerator DEA to a pipe that has been narrowed down, and the high-pressure water that has been sent out from the high-pressure water supply pump BFP. The high-pressure heater HPHTR, the economizer ECO that preheats the high-pressure water preheated by the high-pressure heater HPHTR to a higher temperature, and the high-pressure high-heat water preheated by the economizer ECO to a high temperature are converted into high-pressure steam. And a water separator WS for separating the high-pressure steam converted into steam by the water wall WW and the high-pressure high-heat water not converted into steam.

In this water supply system, a condensed water storage tank HW is also provided from a pipe connecting the economizer ECO and the high pressure heater HPHTR.
A sixth valve V ₆ is attached to the side pipe returning to
Seventh valve V ₇ is attached to the branch pipe branched from a pipe connecting the valve V ₆ and the high-pressure heater HPHTR, eighth valve V ₈ is attached to the side tube back to the condensate storage tank HW from Wota over separator WS, The 9th branch pipe branches from the pipe connecting the 8th valve V ₈ and the water wall WW.
A valve V ₉ is provided.

The steam system is a super heater S that further raises the temperature of the high pressure steam converted by the water wall WW.
P, a high-pressure turbine HP that ejects high-pressure steam heated to a high temperature by a super heater SP to drive a generator, and a reheater R that reheats the steam that has passed through the high-pressure turbine HP.
H, an intermediate pressure turbine IP for ejecting high pressure steam reheated by the reheater RH to drive a generator, and an intermediate pressure turbine I
And a low-pressure turbine LP that ejects high-pressure steam via P to drive a generator.

-Water Movement During Plant Operation in Water Circulation System- In the water circulation system having the above-described structure, water circulates as follows during operation of the thermal power plant. That is, the steam that has finished the work in the low-pressure turbine LP is supplied to the steam condenser C, and the steam is cooled in the cooling tube ST in the steam condenser C and condensed to be converted into water as liquid. The condensed water obtained by converting the steam into water is temporarily stored in the condensed water storage tank HW, and is sent from the condensed water storage tank HW to the condensate demineralizer DEMI by the condensate pump CP. Condensate demineralizer D
The condensed water is ion-exchanged by the EMI, and the purified water from which the ionic substances have been removed is sent to the low pressure heater LPHTR by the condensate booster pump CBP. Low pressure heater LPHT
At R, the purified water is preheated and sent to the deaerator DEA. In the deaerator DEA, purified water is degassed and mainly oxygen gas is removed.

The degassed purified water from which oxygen gas has been removed is sent to the high pressure heater HPHTR as high pressure water by the high pressure feed pump BFP. In the high-pressure heater HPHTR, this degassed purified water is preheated. The preheated degassed purified water is preheated to a higher temperature in the economizer ECO.
The preheated high-pressure degassed purified water is converted into high-temperature high-pressure steam by the water wall WW.

The high-temperature and high-pressure steam converted by the water wall WW is further heated to a higher temperature by the super heater SP, and the obtained high-temperature and high-pressure steam is ejected to the high-pressure turbine HP, passes through the high-pressure turbine HP, and changes in temperature. The reduced high-pressure steam is heated to a high temperature again by the reheater RH and then supplied to the intermediate-pressure turbine IP to drive the intermediate-pressure turbine IP. The steam that has passed through the intermediate pressure turbine IP is supplied to the low pressure turbine LP. The high-pressure turbine HP, the intermediate-pressure turbine IP, and the low-pressure turbine LP drive a generator to output electric power. The steam that has passed through the low-pressure turbine LP is returned to the steam condenser C, and the same cycle as described above is repeated.

-Water Movement at Startup of Thermal Power Plant- At thermal power plant, during regular inspection, when power demand decreases,
When an abnormal condition occurs, the operation is stopped. While the operation is stopped, much circulating water remains in the main piping of this water circulation system. The quality of the residual water deteriorates according to the length of the shutdown period of the thermal power plant. Alternatively, dirt is generated in the pipe. Therefore, when restarting the operation of this thermal power plant, it is necessary to wash the water circulation system.

The washing operation is performed as follows. That is, the first valve V ₁ is released and the second valve V ₁ is opened.
The valve V ₂ and the inlet of the condensate demineralizer DEMI are closed, and make-up water is supplied from the make-up water tank T into the steam condenser C. Make-up water is stored in the condensed water storage tank HW from the steam condenser C. After that, by driving the condensate pump CP, the makeup water is discharged to the outside from the first valve V ₁ . The make-up water supplied from the make-up water tank T is passed through the steam condenser C, the condensed water storage tank HW and the condensate pump CP to make the first
By discharging from the valve V ₁ to the outside of the system, the steam condenser C, the condensed water storage tank HW, the condensate pump CP, and the pipes connecting them are cleaned with makeup water.

After performing the above washing operation for a certain period of time, the second
The valve V ₂ and the third valve V ₃ are released and the first
The inlet of the valve V ₁ and the low pressure heater LPHTR is closed, the condensed water storage tank HW, the condensate pump CP, the second valve V
Water is circulated in the circulation system formed by the side pipe having ₂ and the condensate booster pump CBP and the side pipe having the third valve V ₃ . After circulating for a certain period of time, the inlet of the condensate demineralizer DEMI is opened and the second valve V ₂ is closed, and the condensed water storage tank HW, the condensate pump CP, the condensate demineralizer DEMI, Water booster pump CBP and third
A circulation system formed by a side pipe having a valve V ₃ is circulated. At this time, the water circulated by the condensate demineralizer DEMI becomes demineralized water and is washed.

After that, by repeating the same operation,
Low pressure heater LPHTR, deaerator DEA, high pressure heater H
Cleaning is performed in the PHTR, the economizer ECO, the water wall WW, the water separator WS and the pipes connecting them.

(B) Water quality diagnostic device The water quality in the water circulation system described above is diagnosed by the water quality diagnostic device. Then, the diagnosis result is displayed on the display means in real time. —Structure of Water Quality Diagnostic Device— FIG. 2 is an explanatory diagram illustrating an example of the water quality diagnostic device. Figure 2
As shown in FIG. 1, this water quality diagnostic device includes a process signal generating means 1 in the water circulating system, an AD converter 2 for converting a voltage value signal output from the process signal generating means 1 into a digital signal, and a water circulating system. A water quality detection unit 3 that is installed and detects the quality of water and outputs it as voltage value data, an AD converter 2 that converts the voltage value data output from the water quality detection unit 3 into a digital value, and an AD conversion From the data recording section 4 for converting the data from the water quality detecting means 3 and the process signal generating means 1 into engineering value data via the device 2, the process signal generating means 1, the water quality detecting means 3 and the abnormality alarm generating means 7 described later. The water circulation system is displayed graphically based on the output data, and the water quality data and process data at each water quality detection site are displayed together, The data output from the process state diagram creating means 5 for processing data, the process signal generating means 1 and the water quality detecting means 3 is input so that the water circulation portion in the system is displayed in, for example, light blue, and the designated water quality item is input. So that the changes are displayed in a graph over time,
The data output from the trend diagram creating means 6 for processing the data, the process signal generating means 1 and the water quality detecting means 3 is inputted, and regarding the abnormal water quality, the item of the abnormal water quality, its occurrence location, date and time of occurrence, An abnormal alarm generating means 7 for processing the data so as to display the details of the abnormality,
The data output from the process signal generation means 1 and the water quality detection means 3 are input, and the past water quality data is input from the first storage means 9 which will be described later, and the diagnostic information and abnormality that support the operation of the thermal power plant are input. Real-time data and past data output from the diagnostic processing means 8 for processing data, the process signal generating means 1, and the water quality detecting means 3 so as to diagnose the cause of various water qualities and display the content thereof. Each of the data output from the first storage means 9 for storing, etc., the process state diagram creation means 5, the trend diagram creation means 6, the abnormality alarm generation means 7 and the diagnostic processing means 8 is divided into four display screens. Second storage means 10 for storing in the address corresponding to the pixel, and display drive means 1 for reading out the image data from the second storage means and outputting it to the display means 12.
1 and the image data output from the display drive means 11 are input, and based on the data output from the process state diagram creation means 5, the circulation of water circulating through the water supply system, the steam system and the condensate system in the thermal power plant. Based on the data output from the process state diagram and the trend diagram creating means 6 for displaying the water quality information regarding the current water quality in each part of the system, the trend diagram displaying the water quality history information regarding the history of the water quality in each part of the circulation system. , Based on the data output from the abnormality warning generating means 7, the driving assistance information regarding the water quality, and the cause of the abnormal state based on the data output from the diagnostic processing means 8 are diagnosed to obtain the water quality information regarding the water quality management. , A display means 12 for independently displaying in four areas on the screen,
A control calculation unit 13 for controlling and calculating each unit is provided, and an input unit 14 for instructing the control calculation unit 13 to perform an operation or inputting predetermined data.

In this embodiment, as shown in FIG. 3, a CRT screen is used as the display means 12, and C
The process status is displayed in the upper half area on the left side of the RT screen, the trend diagram that is the water quality history information is displayed in the upper half area on the right side of the CRT screen, and the driving support is provided in the lower half area on the left side of the CRT screen. The diagnostic content, which is information, is displayed, and the diagnostic content, which is water quality information, is displayed in a substantially lower half area on the right side of the CRT screen.

-Each means in the water quality monitoring device-The above-mentioned means will be described in more detail. (A) Process signal generating means 1 The process signal generating means 1 measures the water flow rate at the inlet of the condensate booster pump CBP in the water circulation system, and the water flow rate at the economizer ECO inlet. An example is a water supply system flow rate measuring device. The water flow rate measured by the condensate system flow rate measuring device and the water supply system flow rate measuring device is output to the AD converter as voltage value data.

(B) Water quality detecting means 3 The water quality detecting means 3 detects items such as conductivity of water, pH of water, concentration of dissolved oxygen in water, concentration of hydrazine, concentration of dissolved hydrogen in water, and total iron concentration in water. Turbidity, chlorine concentration in water, and sodium ion concentration in water.

The water quality detecting means 3 for measuring the conductivity of water is
It is a conductivity meter. By monitoring this conductivity, it is possible to check the mixing of seawater, which is cooling water, into the circulation system, and it is possible to monitor the ammonia concentration in water in the circulation system. This conductivity is the same as that in the condensed water storage tank HW in the water circulation system shown in FIG.
Outlet, condensate demineralizer DEMI outlet, low-pressure heater LP
In the HTR, the deaeration device DEA inlet and the deaeration device DEA
Inside, inside the high-pressure heater HPHTR, inside the economizer ECO, from the outlet of the water separator WS, etc., through a branch pipe, it is measured by a conductivity meter which is one of the water quality detecting means 3. The voltage value data on the conductivity of water measured by the conductivity meter is output to the AD converter 2. In the CRT screen on the display means 12, M
Displayed in S or KMS.

The water quality detecting means 3 for measuring the pH of water is p
It is an H meter. By monitoring this pH, iron corrosion can be monitored. This pH is the outlet of the condensate pump CP, the outlet of the condensate booster pump CBP, the economizer EC
It is measured by a pH meter provided from an O inlet or the like through a branch pipe. The pH value of water measured by the pH meter is output to the AD converter 2 as voltage value data. The pH value is indicated by PH on the CRT screen of the display means 12.

The water quality detecting means 3 for measuring the amount of dissolved oxygen in water is a dissolved oxygen meter. When monitoring the dissolved oxygen concentration,
Corrosion in the circulation system can be prevented. This is because it is recognized that the corrosion of iron tends to progress as the dissolved oxygen concentration increases. This dissolved oxygen concentration is the condensate pump CP
Dissolved oxygen meter provided via a branch pipe from the outlet, the low-pressure heater LPHTR, the deaerator DEA and the deaerator DEA outlet, the high-pressure feed pump BFP outlet, the high-pressure heater HPHTR, the economizer ECO inlet, etc. Measured at. The dissolved oxygen concentration in water measured by the dissolved oxygen meter is output to the AD converter 2 as voltage value data. still,
On the CRT screen of the display means 12, the dissolved oxygen concentration is indicated by DO.

The water quality detecting means 3 for measuring the hydrazine concentration in water is a hydrazine densitometer. Monitoring the concentration of hydrazine helps in monitoring the dissolved oxygen concentration. Hydrazine is injected into the circulatory system to consume dissolved oxygen. The injection amount is determined so that some hydrazine remains in the economizer eco. if,
When the injection amount of hydrazine becomes insufficient, it becomes impossible to completely remove dissolved oxygen in water, and when water with dissolved oxygen present is converted to, for example, steam and injected into a turbine, oxidation or corrosion of the turbine is accelerated. As a result, there is a disadvantage that the operable life of the power plant is shortened. So, in a thermal power plant,
It is desirable to inject a predetermined amount of hydrazine into the pipe so that all of the hydrazine is consumed by the dissolved oxygen before reaching the economizer ECO, and a small amount of hydrazine remains in the economizer ECO. Therefore, the hydrazine concentration meter is provided via a branch pipe branched from the inlet of the deaerator DEA, the inlet of the economizer ECO, and the like. The hydrazine concentration measured by the hydrazine densitometer is output to the AD converter 2 as voltage value data. In the CRT screen on the display means 12, the hydrazine concentration is N2.
Displayed in H4.

Water quality detection means 3 for measuring the concentration of dissolved hydrogen
Is a dissolved hydrogen concentration meter. By monitoring the hydrogen concentration, it is possible to detect the occurrence of an abnormal state in the turbine. A dissolved hydrogen concentration meter for measuring the concentration of dissolved hydrogen in water is provided in the reheater RH, the outlet of the intermediate pressure turbine IP, the economizer ECO, and the super heater SP. The concentration of dissolved hydrogen in water measured by the dissolved hydrogen concentration meter is output to the AD converter 2 as voltage value data. The CRT in the display means 12
On the screen, the concentration of dissolved hydrogen is displayed in DH.

The water quality detecting means 3 for measuring the total iron concentration is a total iron analyzer. The measurement of the total iron concentration can monitor the generation of scale in the pipe together with the turbidity of water described below. The all-iron analyzer analyzes iron ions in water sampled from the condensate pump CP outlet, the low-pressure heater LPHTR, the economizer ECO, and the like by batch processing. The total iron analyzer measures, for example, sampled sample water in a sample measuring tank, introduces a fixed amount of the sample water into a heating tank, adds a thioglycolic acid solution and heats it to dissolve the suspended iron, and After reducing the iron ions to ferrous ions, introduce them into the reaction tank via a cooler, adjust the pH by adding ammonium acetate buffer, and then add the TPTZ reagent to the sample water to develop the color and measure the absorbance. The measured data obtained by the measurement is output to the AD converter 2 as voltage value data. The total iron concentration analyzed by the total iron analyzer is displayed as TFE on the CRT screen of the display means 12.

By the way, since the total iron concentration measured by the total iron analyzer is a batch process, the data obtained is discontinuous in time, and the data measured by the turbidimeter directly measures the iron concentration. Since it is not due to the above, an error occurs due to ionic iron existing in water and variation in particle size, so that highly accurate analysis cannot be performed.

In order to eliminate such inconveniences of the total iron analyzer and the turbidimeter, the data of the arithmetic system described later is also adopted. That is, the data X from the turbidimeter is continuously stored in the first storage means 9 over time. The data output from this turbidimeter indicates the turbidity (transparency) of water in the water circulation system, and does not directly indicate the iron concentration. However, there is a correlation between the turbidity and the iron concentration obtained by manual analysis (manual analysis).

The first storage means 9 stores in advance a correlation function between the turbidity meter data and the data obtained by manual analysis of the iron concentration in water. This correlation function is, for example, the following linear regression line formula Y = a + bX (where Y is data obtained by manual analysis [total iron concentration conversion value], X is data obtained by a turbidimeter, and a and b are water in a power plant, etc. According to this correlation function, the correlation between the output data from the turbidimeter and the data obtained by the manual analysis of the iron concentration in water is at least about the correlation coefficient γ = 0.7. The data from the turbidimeter and the correlation function stored in the first storage means 9 are read out and the control calculation means 13
By substituting this data into the correlation function, the iron concentration converted value L is calculated. The calculated iron concentration conversion value L is stored in the first storage means 9. The data Y output from the all-iron analyzer is also stored in this first storage means 9. This data Y shows the iron concentration.

The control calculation means 13, as shown in FIG.
The output X of the turbidimeter and the output Y of the total iron analyzer, which are continuously output over time, are synchronized. When both outputs are synchronized, the iron concentration conversion value L when synchronized from the first storage means 9
Is read and the correction factor Z is calculated by dividing the iron concentration value Y obtained from the total iron analyzer by the iron concentration conversion value L. This correction factor Z is stored in the first storage means 9
Stored in. This correction factor Z is stored in the first storage means 9 without being updated until both outputs are synchronized next time. If the accuracy of the corrected iron concentration is to be improved,
The correction factor Z calculated each time both outputs are synchronized is stored in the first storage means 9 for, for example, 3 synchronizations, and the weighted average or weighted average of the correction factors Z for 3 synchronizations is calculated by the control calculation means 13. However, the obtained average correction factor Z may be stored in the first storage unit 9. The control calculation means 13 reads the correction factor Z, multiplies the correction factor Z ′ by the iron concentration converted value L, and stores the iron concentration in the first storage means 9.

When the output data X from the turbidimeter and the output data Y from the total iron analyzer are not synchronized with each other, the control calculation means 13 stores the data immediately before the one stored in the first storage means 9. The correction factor Z ′ or the average correction factor Z ′ obtained from the synchronized data is read out, and the control calculation means 13 multiplies the correction factor Z ′ by the iron concentration conversion value L to obtain the obtained iron concentration. 1 storage means 9
To store.

The water quality detecting means 3 for measuring turbidity is a turbidimeter. By measuring this turbidity, the concentration of iron as a solid content in the circulating water can be measured, and together with the total iron concentration, generation of scale in the pipe can be monitored. The turbidity meter is provided in the outlet of the condensate pump CP, in the low-pressure heater LPHTR, and in the branch pipe drawn from the economizer ECO and the like. The turbidimeter may be either an absorptiometric type or a scattered light type. From this turbidimeter, the measurement data is output to the AD converter 2 as voltage value data. The turbidity analyzed by the turbidimeter is displayed on the display means 1
The CRT screen in 2 is displayed on the TV.

Water quality detecting means 3 for measuring chlorine concentration in water
Is a chlorine concentration meter. By measuring the chlorine concentration, it is possible to detect the mixing of seawater into the circulating water together with the detection of sodium ions described below. The chlorine concentration meter is provided at the end of the branch pipe drawn out from the condensate pump CP outlet. The chlorine concentration in the water measured by the chlorine concentration meter is output to the AD converter 2 as voltage value data.

The water quality detecting means 3 for measuring the sodium concentration in water is a sodium ion concentration meter. By measuring the sodium ion concentration, it is possible to detect the mixing of seawater into the circulating water together with the measurement of the chlorine concentration.
The sodium ion concentration meter is provided at the end of the branch pipe drawn out from the condensate demineralizer DEMI outlet. The sodium ion concentration in the water measured by the sodium ion concentration meter is output to the AD converter 2 as voltage value data.

(C) AD converter 2 The AD converter 2 converts the voltage value data, which is the process signal output from the process signal generating means 1, into digital data, and the voltage output from the water quality detecting means 3. Converts analog data related to various water qualities as value data into digital data. The AD converter 2 outputs the converted digital data to the data recording section.

(D) Data recording unit 4 The data recording unit 4 converts the digital data output from the AD converter 2 into engineering value data, transfers it to the first storage means 9, and stores it.

(E) Process State Diagram Creating Means 5 The process state diagram creating means 5 is C on the display means 12.
The water circulation system is graphically displayed in a predetermined area of the RT screen, for example, the upper left half area of the CRT screen, and the various water quality data detected by the water quality detection means 3 and the water in the water circulation system detected by the process signal generation means 1 are displayed. Necessary data is read from the first storage means 9 so that the flow rate of the water circulation system can be displayed at fixed time intervals, and graphic data for displaying the water circulation system as a simple graphic, and for displaying the water circulation site in the water circulation system in color. The color display signal, the process data indicating the water flow rate in the water circulation system, and the water quality data indicating the water quality at each part in the water circulation system are output to the second storage unit 10. Further, the process state diagram creation means 5 inputs the data relating to the water quality in the abnormal state output from the abnormality alarm generation means 7, and displays the display data for displaying the abnormal water quality in red inversion on the CRT screen. Output to the storage unit 10.

(F) Trend diagram creating means 6 The trend diagram creating means 6 is a CRT on the display means 12.
In the predetermined area of the screen, for example, in the upper right half area, the specified storage condition stored in the first storage means 9 so that the change in the specified water quality for a certain period can be displayed in the graph of the vertical axis and the horizontal axis. The data regarding the water quality over a certain period is read, the water quality is converted into graphic display data to be displayed in a graphic form, and this is output to the second storage means 10.

(G) Abnormal alarm generating means 7 The abnormal alarm generating means 7 is output from the water quality detecting means 3 and the process signal generating means 1, and the first storing means 9 is provided.
When the data read from the first storage means 9 exceeds the threshold, the data (abnormal data) exceeding the threshold is read out. The date and time of occurrence, the water quality item indicated by the anomaly data, the name of the department in which the anomaly data occurred, and alarm information display data indicating the anomaly content are stored as water quality information. Further, the abnormal data is output to the process state diagram creating means 5,
As described above, on the CRT screen, the water quality in the abnormal state is displayed in red color in the process state diagram.

(H) Diagnostic Processing Means 8 This diagnostic processing means 8 comprises (1) a startup process water quality diagnostic system, (2) a seawater leak diagnostic system, (3) a chemical injection-related diagnostic system, and (4) an air leak determination assist. A diagnostic system is provided, and the diagnostic result is instructed to be displayed on the display means 12 as a message of either driving support information or water quality information.

The diagnostic systems (1) to (4) will be described below. (1) Start-up process water quality diagnostic system The start-up process water quality diagnostic system has the function of monitoring and determining the water quality in the start-up process of a power plant that is frequently started and stopped. When the power plant is started again after it is stopped, accumulated water remains in each department of the water circulation system, so it is necessary to remove them and thoroughly wash the water circulation system. Thus, whether or not the water circulation system has been sufficiently cleaned is checked by the water quality diagnostic system for the starting process.

The measurement data used for water quality determination are water conductivity, iron content of water, turbidity of water, and hydrazine concentration. In this startup process water quality diagnosis system,
The water quality in the startup process is determined by the following processing procedure.

<Water quality check by conductivity> As shown by the processing procedure of FIG. 4, the conductivity output from the conductivity meter, which is the water quality detection means 3, and the detected conductivity is compared with the set value. When the value exceeds the set value, a command for displaying a message indicating the conductivity meter measuring the conductivity exceeding the set value on the display means 12 is output, and after a certain period of time, the water in the conductivity measuring section is further discharged. Measure the conductivity.

As a result of comparing the electric conductivity with the set value, when the electric conductivity is equal to or less than the set value, the measured electric conductivity is read out from the first storage means 9 in a certain period from the present to the past. Be done. Then, it is determined whether or not some of the read conductivity exceeds the set value. This process checks whether the conductivity measured within a certain period from the present to the past is stable and within the set value, and confirms that the cleaning line was sufficiently cleaned during the startup process. ..

When any one of the conductivity measured within a certain period in the past exceeds the set value, as shown in FIG. 4, the process returns to the measurement of the conductivity after a certain period of time. When none of the conductivity measured within a certain period in the past exceeds the set value, the judgment of the conductivity water quality OK is output. This output is stored in the first storage means 9.

<Water Quality Check Based on Iron Content> In parallel with performing the procedure for checking the water quality based on the conductivity, the iron content in water in the cleaning line is checked. The presence of rust, etc. generated by the accumulated water in the water circulation system during the power plant stop is judged by the water quality check based on this iron content.

The iron content in water in the water circulation system is calculated by a total iron densitometer, a turbidimeter and an arithmetic iron system. The measured iron concentration is compared with the set value stored in the first storage means 9 in advance. When the read iron concentration is higher than the set value, the fact that the iron concentration is higher than the set value is displayed on the display means 12 via the second storage means 10, and the next iron concentration is read.

When the read iron concentration is smaller than the set value, next, the measured iron concentration in a certain period from the present to the past is read from the first storage means 9. Then, it is determined whether any of the read iron concentrations exceeds the set value. This process checks whether the iron concentration measured within a certain period from the present to the past is stable and within the set value, and the water quality related to the iron concentration in the cleaning line is stabilized. Make sure that

When any one of the iron concentrations measured within a certain period in the past exceeds the set value, the process returns to the next conductivity reading as shown in FIG. When none of the iron concentrations measured within a certain period in the past exceeds the set value, the determination of the iron concentration water quality OK is output, and this is output to the first storage means 9.

<Checking Water Quality by Amount of Hydrazine> In parallel with performing the procedure for checking water quality by the conductivity, the amount of hydrazine in water in the cleaning line is checked. The hydrazine concentration output from the hydrazine meters arranged at various places in the cleaning line is temporarily stored in the first storage means 9. As shown in FIG. 7, the stored hydrazine concentration and the set value stored in advance in the first storage unit 9 are read out, and the set value and the measured hydrazine concentration are compared.

When the hydrazine concentration is larger than the set value, a command for displaying a message indicating the hydrazine meter measuring the hydrazine concentration larger than the set value on the display means 12 is output, and the next hydrazine concentration is set to the first value. The same comparison operation is repeated by reading from the storage means 9.

When the read hydrazine concentration is smaller than the set value, next, the measured hydrazine concentration for a certain period from the present to the past is read from the first storage means 9. Then, it is determined whether or not some of the hydrazine concentrations read out exceed the set value.
This process checks whether the hydrazine concentration measured within a certain period from the present to the past is stable and within the set value, and the water quality related to the hydrazine concentration in the washing line is stable. Make sure that

When any one of the hydrazine concentrations measured within a certain period in the past exceeds the set value, the process returns to the next conductivity reading as shown in FIG. When none of the hydrazine concentrations measured within a certain period in the past exceeds the set value, the determination of hydrazine concentration water quality OK is output, and this is output to the first storage means 9.

<Comprehensive Judgment> All of the water quality according to the conductivity, the water quality according to the iron concentration and the water quality according to the hydrazine concentration are OK, and the content checked by the seawater leakage diagnosis system described later is the result of “no seawater leakage”. When there is no abnormality in the chemical injection-related data by the chemical injection-related diagnostic system described later, it is determined that the water quality in the cleaning line is a water quality that can be normally operated, and a second command for displaying that fact is displayed on the display unit 12. It is output via the storage means 10.

(2) Seawater Leakage Diagnosis System This seawater leakage diagnosis system diagnoses the presence or absence of seawater leakage to the water circulation system, and gives advice on the amount of seawater leakage, the leakage location, and the operation of the condensate desalination unit DEMI. It has a function to output etc. The water quality data in the seawater leakage diagnosis system includes the conductivity output from the conductivity meter installed in the condensed water storage tank HW, the conductivity at the outlet of the condensate pump CP as a subtraction result to be described later, and the condensate pump CP. It is the chlorine concentration at the outlet and the sodium ion concentration at the inlet of the condensate demineralizer DEMI.

The conductivity is subtracted from the conductivity meter, which is the water quality detecting means 3, and the detected conductivity and the supply amount of makeup water measured by the makeup water flow rate measuring device in the process signal generating means 1 are calculated. The increase amount of the electric conductivity based on the supplied and supplied replenishment water is subtracted from the electric conductivity measured by the electric conductivity meter, and the subtracted value is stored in the first storage means 9. The subtraction process is executed by the control calculation means 13.

Here, the reason for subtracting the electric conductivity based on the supplied makeup water is as follows. That is, the makeup water tank T is closed by the lid but is not airtight in a strict sense, and stores makeup water in an open state with respect to the outside air. Therefore, when the makeup water is stored in the makeup water tank T for a long time, the carbon dioxide gas in the outside air is dissolved in the makeup water. This dissolution of carbon dioxide increases carbonate ions in the makeup water. This carbonate ion
When make-up water is replenished to the condensate system, it increases the conductivity of the water in the condensate system. The measurement data of water conductivity is used as basic data to judge seawater leakage. Therefore, the increase in conductivity due to the supply amount of makeup water is subtracted so that the increase in conductivity in the condensate system depends not only on the inflow of makeup water but on the leakage of seawater.

Therefore, the inflow amount of the makeup water and the increase value of the electric conductivity of the water in the condensate system due to the inflow amount are stored in the first storage means as data which is experimentally determined in advance. Furthermore, since a predetermined time elapses until the water flows from the make-up water tank T to the department where the conductivity meter is installed, the predetermined time elapses after the start of the inflow of the make-up water. The conductivity based on make-up water is subtracted from the conductivity measured from time to time. Since such a predetermined delay time is unique to the department where the conductivity meter is installed,
This peculiar delay time is stored in the first storage means 9, read out at any time, and input to the diagnosis processing means 8.

In the seawater leakage diagnosis, the condensed water storage tank H
Two types of set values, an upper limit and a lower limit, are set for the conductivity output from the conductivity meter installed at W, and two types of set values are set for the conductivity as a subtraction result at the outlet of the condensate pump CP. Is provided, and two kinds of set values, an upper limit and a lower limit, are set for the chlorine concentration at the outlet of the condensate pump CP, and two kinds of set values, an upper limit and the lower limit are set for the sodium ion concentration at the inlet of the condensate demineralizer DEMI. For data that exceeds the upper limit, it is determined that there is seawater leakage, and when the detected data is between the upper limit value and the lower limit value, it is determined that there is a risk of seawater leakage, and when the detected data is less than the lower limit value, seawater leakage is determined. It is determined that there is no leakage. The upper limit value and the lower limit value are stored in the first storage means 9 in advance. Table 1 shows conditions that cause seawater leakage and conditions that do not cause seawater leakage.

[0070]

[Table 1]

In this seawater diagnostic leakage system, the conductivity obtained by subtracting the conductivity output from the conductivity meter for the condensate pump CP and the conductivity output from the conductivity meter for the condensed water storage tank HW are measured. In comparison with the preset upper and lower limits, the three types of rankings are performed [(1) There is a leak, (2) There is a risk of leak, (3) There is no leak], and at the outlet of the condensate pump CP. The chlorine concentration is also compared with preset upper and lower limits to perform the above-mentioned three types of ranking, and the preset three types of sodium ion concentration in the condensate demineralizer DEMI are also assigned. Then, the presence or absence of seawater leakage is determined according to the criteria shown in Table 1 for the obtained four ranks,
When it is determined that seawater has leaked, an indication that seawater has leaked is output to the display means 12 via the second storage means 10, and an operating guideline for the condensate demineralizer DEMI, for example,
The second storage means 1 also displays the continuous operation possible time on the display means 12.
Output through 0.

(3) Drug injection-related diagnostic system This drug injection-related diagnostic system detects abnormalities in the injection of ammonia and hydrazine added to the water circulation system into the water circulation system, advises on chemical injection, and instrument abnormality. Has a function of displaying a message or the like on the display device.

The diagnostic content is calculated by calculating the electrical conductivity from the amount of injected ammonia, and comparing the electrical conductivity with the electrical conductivity at the outlet of the condensate booster pump CBP to diagnose the ammonia injection state. And hydrazine injection amount and hydrazine injection diagnosis to diagnose the injection state of hydrazine, conductivity cross-check diagnosis to diagnose normal and abnormal conductivity meter by cross-checking the conductivity measured at various places in the water circulation system, The pH is diagnosed by diagnosing the pH meter by converting the conductivity into a pH value and comparing it with the pH indication value at the same measurement point, and the pH is corrected by makeup water.

Ammonia Injection Diagnosis This ammonia injection diagnosis is based on that it is the ammonia concentration that affects the conductivity of water in the water circulation system in the power plant. Ammonia is injected by the ammonia injection pump, and two ammonia injection pumps are provided, and normally one of them is operated.

In this ammonia injection diagnosis, the ammonia concentration [NH ₃ ] and conductivity [μs] of water in the water circulation system are converted according to the following conversion formula.

[NH ₃ ] = [({μS / 1.36 × 10 ⁵ } + 1.8 × 10 ^-5 ) ² −3.24 × 10 ^-10 ] / (4.24 × 10 ^-9 ) ...・ ・ (1) [μs] = 1.36 × 10 ⁻⁵ × {−1.8 × 10 ⁻⁵ × (3.24 × 10 ⁻¹⁰ +4.0 × 1.8 × 4.24 × 10 ⁻⁹ × [NH ₃ ]} ^1/2・... (2) Therefore, as shown in FIG. 8, in advance, each conductivity measured by a conductivity meter at each place of the water circulation system is compared with each other,
Make sure that the electrical conductivity at the outlet of the condensate booster pump 8CBP is within the acceptable range. Next, the conductivity at the outlet of the condensate demineralizer DEMI is calculated by the conversion formula
Convert to ammonia concentration according to (1). The ammonia concentration after the ammonia injection is calculated by calculating and adding the ammonia concentration from the amount of ammonia injected by the ammonia injection pump and the flow rate output by the condensate system flow rate measuring device. The calculated ammonia concentration is converted into conductivity according to the conversion formula (2).
The converted conductivity is compared with the conductivity measured by the conductivity meter at the outlet of the condensate booster pump CBP. As a result of the comparison, when the two electric conductivity match within the allowable range, it is determined that there is no ammonia concentration abnormality, and a command to display a message to that effect on the display means 12 via the second storage means 10 is output.

On the other hand, as a result of the comparison, when the two electric conductivities are out of the allowable range and do not match, the ammonia injection pump is switched to another ammonia injection pump. Then, as in the previous time, the ammonia concentration of water in the water circulation system is calculated again, the obtained ammonia concentration is converted to electric conductivity, and the electric conductivity of water measured by a conductivity meter is calculated separately from the electric conductivity obtained by conversion. Compare with the rate. As a result, when the converted conductivity and the measured conductivity match within the allowable range, it is determined that the ammonia injection pump is abnormal, and the ammonia injection pump should be checked. And outputs a command to display the message on the display unit 12 via the second storage unit 10. If the conductivity obtained by conversion and the measured conductivity do not match within the allowable range, it is determined that the concentration of ammonia water injected into the water circulation system is abnormal, and the concentration of ammonia water is checked. A command to display a message to the effect on the display means 12 via the second storage means 10 is output.

Hydrazine Injection Diagnosis This hydrazine injection diagnosis diagnoses whether or not the injection of hydrazine by the hydrazine injection pump is appropriate. This hydrazine infusion pump has two groups, a first hydrazine infusion pump and a second hydrazine infusion pump, and normally one of them is used.
The base is operating.

The hydrazine concentration in water at a predetermined position in the water circulation system was measured by a hydrazine meter, and the A / D converter 2
The measured hydrazine concentration is stored in the first storage means 9 via. The first storage unit 9 stores the maximum hydrazine concentration in water during normal operation (maximum hydrazine concentration) and the minimum hydrazine concentration in water during normal operation (minimum hydrazine concentration). As shown in FIG. 9, the measured hydrazine concentration read from the first storage means 9 is compared with the maximum hydrazine concentration and the minimum hydrazine concentration read from the first storage means 9.

As a result of the comparison, if the measured hydrazine concentration is within the range between the maximum hydrazine concentration and the minimum hydrazine concentration, it is determined that the injection of hydrazine is properly performed, and a message to that effect is given to the second storage means. A command to be displayed on the display means 12 is output via 10.

As a result of the comparison, when it is determined that the measured hydrazine concentration exceeds the maximum hydrazine concentration, the operation of the first hydrazine infusion pump is stopped while the operation of the second hydrazine infusion pump is started. 2 A command to be displayed on the display means 12 is output via the storage means 10. Next, the hydrazine concentration in the water after injecting hydrazine into the water circulation system by the second hydrazine injection pump is measured by a hydrazine meter and output to the first storage means 9,
Remember. Then, the measured hydrazide concentration read from the first storage means 9 is compared with the maximum hydrazine concentration and the minimum hydrazine concentration read from the first storage means 9.

As a result of the comparison, if the measured hydrazine concentration is within the range between the maximum hydrazine concentration and the minimum hydrazine concentration, a message indicating that the pump is abnormal and the pump should be checked is displayed in the second storage means 10. A command to be displayed on the display means 12 is output via the. As a result of the comparison, when the measured hydrazine concentration is higher than the maximum hydrazine concentration, it is judged that there is no abnormality in the pump and the concentration of the hydrazine solution stored in the hydrazine tank is abnormal, and the concentration of the hydrazine solution should be checked. And outputs a command to display the message on the display unit 12 via the second storage unit 10.

Cross-Check Diagnosis This cross-check diagnosis has a function of determining whether or not a conductivity meter for measuring the conductivity of each part of the water circulation system is operating normally and displaying an abnormal conductivity meter.

In this cross-check diagnosis, the respective electric conductivities output from the electric conductivity meters for measuring the electric conductivities at various places in the water circulation system are compared with each other, and the difference is taken. Is the difference within the allowable range? To judge. When a conductivity whose difference is outside the allowable range is found, a command to display the conductivity meter that outputs the conductivity on the display unit 12 via the second storage unit 10 is output.

PH Meter Diagnosis This pH meter diagnosis monitors the normal operation of the pH meter and diagnoses the presence of abnormal pH meters. In this pH meter diagnosis, the conductivity of water in the water circulation system is converted into a pH value according to the following conversion formula.

[PH] = log (conductivity) +8.565
6. Therefore, as shown in FIG. 10, the electric conductivity measured by the electric conductivity meter at each place of the water circulation system is compared with each other in advance, and it is confirmed that the electric conductivity is within the allowable range. Then, the pH value measured by the pH meter is converted into conductivity according to the conversion formula. The converted conductivity (converted conductivity) is compared with the conductivity measured by a conductivity meter (measured conductivity). As a result of the comparison, when both conductivity values are within the allowable range, it is determined that the pH meter is normal,
A command to display a message to that effect on the display means 12 via the second storage means 10 is output.

On the other hand, as a result of the comparison, when the two electric conductivities exceed the permissible range and do not match, it is determined that the pH meter is abnormal, and a message indicating the pH meter that outputs an abnormal pH value is displayed in the second storage means. A command to be displayed on the display means 12 is output via 10.

Corrective Diagnosis of pH by Make-up Water This corrective diagnosis of PH has a function of correcting a decrease in pH of the circulating water in the water circulating system due to the introduced make-up water when the make-up water is introduced from the make-up water tank T into the water circulating system. Have. The pH value output from the pH meter in the condensate pump CP, which is the water quality detecting means 3, and the detected pH value and the supply amount of the makeup water measured by the makeup water flow rate measuring device in the process signal generating means 1 are input and supplemented. PH based on the makeup water supplied
The decrease in the value is added to the pH value measured by the pH meter, and the added value is stored in the first storage means 9. The addition processing is executed by the control calculation means 13. The exact pH value obtained as a result of the addition is applied in the diagnosis described above.

Here, the reason for adding the amount of decrease in the pH value based on the replenished water that has been replenished is the same as described in <Water quality check by conductivity>. In this correction diagnosis, the inflow amount of the makeup water and the decrease value of the pH value of the water in the condensate system due to the inflow amount are stored in the first storage means 9 as data which is experimentally determined in advance. Furthermore, since a predetermined time elapses until the water flows from the makeup water tank T to the department where the pH meter is installed, the makeup water is sent at a predetermined time after the start of the inflow of makeup water. From the measured pH value, the pH value based on makeup water is added. Since such a predetermined delay time is unique to the department in which the pH meter is installed, this specific delay time is stored in the first storage means 9 and read out at any time to the diagnostic processing means 8. Is entered.

As a result of comparing the pH value as the addition result with the set value, if the pH value after the addition exceeds the set value, a message indicating the pH meter measuring the pH value exceeding the set value is displayed on the display means 12. Output the command to be displayed.

(I) First Storage Means 9 The first storage means 9 stores various process data measured by the process signal generation means 1 and various water quality data detected by the water quality detection means 2, It stores various calculation results obtained by the diagnosis processing means and various preset threshold values or set values.

(J) Second Storage Means 10 The second storage means 10 stores the image data created by the process state diagram creation means 5, various real-time water quality data and process data stored in the first storage means 9. , The image data created by the trend diagram creation means 6, the image data created by the abnormality warning generation means 7, and the diagnostic processing means 8
The image data for displaying the various diagnostic results created in step 1 as an image is stored.

(K) Display Drive Means 11 The display drive means reads the image data stored in the second storage means 10 and outputs it to the display means 12. (L) Display Means 12 The display means 12 is, for example, a CRT. On the upper left half of the CRT screen, an image displaying a process state diagram based on the image data created by the process state diagram creating means 5 is displayed. In the image displaying this process state diagram, the water circulation system as shown in FIG. 1 is displayed in a graphic form, and the line in which water exists in the water circulation system is displayed in, for example, light blue and the steam system line is displayed in yellow. However, the line in which water does not exist is simply displayed in black, while the various water qualities detected by the water quality detection means 3 and the various process data measured or detected by the process signal generation means 1 are color-coded in predetermined colors. The water quality data indicating abnormalities are displayed in white on a red background. The water quality data and the process data are updated and displayed on the CRT screen at regular intervals. It should be noted that the image displaying this process state diagram is displayed by an input operation in the input means 14, for example, a key operation or a mouse operation.
It is also possible to enlarge and display the entire CRT screen.

On the upper right half of the CRT screen, an image for displaying the trend diagram created by the trend diagram creating means 6 is displayed. In the image displaying this trend diagram, changes in water quality data and process data designated by the input means 14 over a certain period are displayed in a graph.
The fixed period can be arbitrarily changed, and which period is selected is arbitrarily determined by the input operation of the input unit 14. The image for displaying the trend diagram can be enlarged and displayed on the entire CRT screen by an input operation in the input means 14, for example, a key operation or a mouse operation.

On the lower left half of the CRT screen, an image displaying messages relating to various driving assistance diagnosed by the diagnostic processing means 8 is displayed. The diagnostic message includes the date of the diagnostic processing, the hour, minute, second, the type of diagnostic and the diagnostic content. Such messages are displayed and stored in the first storage means 9, and when a certain number of alarms are displayed, the oldest messages are sequentially deleted.
It is read from the first storage means 9 again by an input operation in the input means 14, for example, a key operation or a mouse operation,
Can be displayed. The latest message is displayed in red, white is displayed by inputting a message confirmation by the input means 14, and it can be deleted by removing the cause of outputting the message. The work capacity related to the message can be printed out.

On the lower right half of the CRT screen, an image displaying a diagnostic message relating to various water quality information diagnosed by the diagnostic processing means 8 is displayed. The diagnostic message includes the date of the diagnostic processing, the hour, minute, second, the type of diagnostic, and the diagnostic content. Table 2 shows a specific example of the content of the diagnostic message.

[0097]

[Table 2]

As described above, the image showing the process state diagram, the image showing the trend diagram, the image showing the driving support message, and the image showing the water quality diagnostic message are driven and displayed independently of each other. (M) The control calculation means 13 is a computer system that controls each means of each unit and controls execution of each system. (N) The input means 14 is, for example, a keyboard or a mouse.

[0099]

According to the water quality diagnostic apparatus of the present invention, the water quality of the water circulation system in a thermal power plant is automatically analyzed, and an abnormal condition is found and its cause and countermeasures are diagnosed. It was possible to detect the presence or absence of seawater leakage at an early stage, reduce the analysis work load on water quality analysis experts, and even inexperienced plant operators can operate power generation plants. Like

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a water circulation system in a thermal power plant.

FIG. 2 is a block diagram showing a water quality monitoring device provided with the water circulation system display device of the present invention.

FIG. 3 is an explanatory diagram showing a CRT screen of a water circulation system display device.

FIG. 4 is a flow chart showing a processing procedure for checking water quality based on conductivity in the water quality diagnostic system for a startup process.

FIG. 5 is a flow chart showing a procedure for calculating an iron content corrected by the turbidity measured by a turbidimeter and the total iron concentration by a total iron analyzer.

FIG. 6 is a flow chart showing a processing procedure for checking the water quality based on the iron content in the startup process water quality diagnosis system.

FIG. 7 is a flow chart showing a processing procedure for checking the water quality by the amount of hydrazine in the starting process water quality diagnostic system.

FIG. 8 is a flowchart showing a processing procedure of ammonia injection diagnosis in the medicine injection related diagnosis system.

FIG. 9 is a flowchart showing a processing procedure of hydrazine injection diagnosis in the drug injection-related diagnosis system.

FIG. 10 is a flowchart showing a processing procedure of cross-check diagnosis in the drug injection-related diagnosis system.

[Explanation of symbols]

ST Cooling pipe C Steam condensator HW Condensate tank CP Condensate pump DEMI Condensate demineralizer CBP Condensate booster pump LPHTR Low pressure presser DEA Deaerator V ₁ 1st valve V ₂ 2nd valve V ₃ 3rd valve V ₄ 4th valve V ₅ 5th valve BFP High-pressure pump HPHTR High-pressure heater ECO Eco-friendly economizer WW Waterwall WS Water separator V ₆ 6th valve V ₇ 7th valve V ₈ 8th valve SP Super heater HP High-pressure turbine RH reheater IP Medium pressure turbine LP Low pressure turbine 1 Process signal generation means 2 AD converter 3 Water quality detection means 4 Data recording section 5 Process state diagram creation means 6 Trend diagram creation means 7 Abnormal warning generation means 8 Diagnostic processing means 9 First storage means 10 Second storage means 11 Display drive means 12 Display means 13 Control calculation means 14 Input means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kuwa Middle East, 34-2, Shibuya-ku, Tokyo 3-2, Nikkiso Co., Ltd. (72) Inventor Toshiaki Aoki 3-43, Ebisu, Shibuya-ku, Tokyo Nikkiso Co., Ltd.

Claims (1)

[Claims] 1. A hydrazine meter, a total iron meter, a turbidimeter, a calculation iron system, a chlorine ion meter, a conductivity meter, a pH meter, and a dissolved water circulation system including a water supply system, a steam system, and a condensate system in a thermal power plant. Water quality detection means consisting of an oximeter, a sodium meter and a dissolved hydrogen meter, a storage means for storing water quality data output from the water quality detection means, data output from the process signal generation means and the water quality detection means, and , Inputting past water quality data from the first storage means, diagnosing the cause of the operation support relating to the power plant operation and abnormal water quality, and displaying the content thereof,
A water quality diagnostic device for a plant, comprising a diagnostic processing means for processing data, and a display device for displaying a diagnostic result.