Power station water vapor system pH measurement self-calibration method and measurement calibration system

Abstract

The invention belongs to the technical field of analysis and detection, and relates to a power station water vapor system pH measurement self-calibration method and measurement calibration system.The method comprises the following steps that 1, the hydrogen conductivity value, the conductivity value sigma and the pH measurement value of a water sample are detected respectively and transmitted to a control device; 2) when the hydrogen conductivity value is greater than 0.3 [mu] S / cm, the control device extracts a pH value signal and directly outputs the pH value signal, and sends out a manual calibration prompt; and when the hydrogen conductivity value is smaller than 0.3 [mu] S / cm, the control device extracts a conductivity value signal, calculates a pH calculated value according to the pH value of 8.57 + lg sigma, calibrates the pH measured value by using the pH calculated value, and sends out a prompt for starting the automatic calibration of the pH value. According to the invention, the automatic calibration of the pH measurement result can be realized, the accuracy of the measurement result is ensured, the regular calibration period is long, and the daily maintenance is simple.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and relates to a pH measurement self-calibration method and a measurement calibration system of a water vapor system of a power station. Background technique [0002] In the operation of the power station, since the acidity of the water vapor system will cause corrosion to the thermal equipment and pipelines, the treatment method of adding ammonia water at the ammonia adding point is generally used to improve the alkalinity of the water, so as to achieve the purpose of anti-corrosion. Therefore, it is necessary to test the pH in actual operation. At present, most power stations install online pH meters at the feedwater measuring points after ammonia addition, so as to monitor the changes of water pH in real time. [0003] Although the current online pH meter measurement method can realize the control of the pH of the water vapor system, the traditional pH meter calibration method i...

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Problems solved by technology

[0003] Although the current online pH meter measurement method can realize the control of the pH of the water vapor system, the traditional pH meter calibration method is not only time-consuming but also easily introduces calibration errors due to improper operation.

The specific reason is that the existing on-line pH measurement uses the glass electrode method, and the electrode often needs to be calibrated to ensure the accuracy of pH measurement. This calibration method mainly has the following disadvantages: (1) The calibration cycle is frequent, and the general maintenance personnel need to regularly Calibrate once, as the electrode usage time increases, the calibration cycle will be more frequent, which will increase the workload of maintenance personnel; (2) The calibration process is complicated, and maintenance personnel need to prepare a calibration solution in the laboratory, which may expire, so It is also necessary to configure a new solution regularly, and then take the electrode out of the flow cell of the meter and put it into the calibration solution for calibration according to the calibration procedure; (3) This calibration method itself has the risk of introducing calibration errors, because the calibration solution is generally poured directly Into the open beaker, and then insert the electrode, at this time in the process of performing the calibration procedure, the carbon dioxide in the air will dissolve into the calibration solution to form carbonic acid, resulting in changes in the acidity and alkalinity of the calibration solution itself

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