THERMAL POWER PLANT AND METHOD FOR MANAGING ITS OPERATION

摘要

PROBLEM TO BE SOLVED: To provide a thermal power plant having excellent corrosion resistance capable of deciding a charging amount of a deoxidizer by using a result by clarifying a necessary deoxidizer concentration by measuring the corrosion electric potential in a boiler circulating water system and a method for managing its operation. SOLUTION: The thermal power plant having a water circulating system including a boiler, a turbine and a condenser comprises a means for measuring a corrosion potential of metal brought into contact with boiler water or feed water, and a means for regulating a concentration of a less toxic deoxidizer than a hydrazine so as to make corrosion potential lower than that of metal when deaerated. The method for managing an operation of the plant comprises the steps of measuring the corrosion potential of the metal brought into contact with boiler water or feed water by using a reference electrode and a potentiometer, and regulating the concentration of the deoxidizer so that its molecular weight is larger than that of the hydrazine and smaller than that of a tunnin and the concentration of the deoxidizer reacted with oxygen in water is lower than the potential of the metal when deaerated.