The following briefly introduces how the circulating cooling water of the plate heat exchanger performs automatic heat exchange control.

In the field of industrial water, the presence of cooling water fouling and corrosion seriously affects the operation of equipment, and at the same time causes huge energy waste. Automatic dosing control scheme for circulating cooling water. The system uses fouling thermal resistance as a feedback variable, and compares the difference with the fouling thermal resistance threshold set by the program. According to the comparison result, it outputs a control signal to the PID controller to control the start, stop and stop of the corrosion and scale inhibitor dosing pump The opening degree can adjust the dosage of corrosion and scale inhibitor.

At the same time, according to the comparison result of the calculated fouling thermal resistance value and the fouling thermal resistance threshold value, the threshold values ​​of pH value, ORP and concentration ratio are automatically adjusted. By changing the threshold value of key water quality parameters, the dosage of concentrated sulfuric acid and bactericidal algicide is controlled. Increase the amount to control the amount of supplementary water and sewage.

On-line monitoring components The measuring components are composed of dirt thermal resistance monitor, flow meter, pH meter, conductivity meter and ORP analyzer. An online fouling thermal resistance monitor is designed according to the principle of fouling thermal resistance measurement. The monitor is based on the actual flow pattern, water quality, metal material and heat exchange intensity of the circulating cooling water in the power plant by simulating the heat exchanger. To simulate the heat exchange effect of the condenser, thermal resistance sensors, thermocouple sensors and flow meters are used to collect the inlet and outlet temperature, pipe wall temperature and flow velocity of the simulated heat exchanger respectively.

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