The pH values of boiler feed water

steam

boiler water and other measuring points in a chemical power plant were abnormally low

and the problem could not be effectively solved by adjusting the boiler water dosing process. In order to solve this problem and ensure the safe operation of the unit

this paper discusses and analyzes the influence of water sample temperature on p H electrode

Nernst temperature coefficient slope and solution temperature coefficient(ionic activity)

and verifies through experiments that the abnormally low pH measurement value is caused by the large deviation of water sample temperature from 25 ℃

and the pH measurement method cannot provide correct temperature compensation. Strict control of water sample temperature

adoption of computational pH meter or selection of high-precision pH meter with precise non-linear temperature compensation function can effectively solve the problem of abnormally low pH measurement in the water and steam system.