Boiler plant, power plant, and boiler plant control method

摘要

PROBLEM TO BE SOLVED: To quickly adjust a pH value to a target value and suppress an increase in plant operating cost due to excessive injection of ammonia. SOLUTION: Ammonia is added to the condensed water supplied to the exhaust heat recovery boiler on the upstream side of the exhaust heat recovery boiler, the steam turbine 20, the condenser 30, the condenser pump 40, and the condenser pump 40. Ammonia injection unit 50 to inject, measurement unit 80 to measure the pH value of condensed water supplied from the condensate pump 40 to the exhaust heat recovery boiler, or to calculate the pH value from the measured electrical conductivity, and ammonia injection unit A control unit 90 for controlling 50 is provided, and the control unit 90 measures the pH value measured by the measurement unit 80 when the ammonia injection unit 50 injects ammonia before the ammonia injection unit 50 injects ammonia. Provided is a boiler plant that calculates the injection amount of ammonia according to the value and the target value of the pH value, and controls the ammonia injection unit 50 so as to inject the injection amount of ammonia. [Selection diagram] Fig. 2