DEVICE FOR CONTROLLING FLUE GAS DENITRATION AND METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To enhance the follow-up ability for controlling ammonia injection amount into a flue gas denitration device at time of high-speed load fluctuation. SOLUTION: An outlet NOx concentration signal 36 sent from an outlet NOx concentration meter 4 and an ammonia flow rate signal 41 sent from an ammonia flow meter 6 are inputted to a forecasting control device 30. The outlet NOx concentration of a flue gas denitration device is forecasted every future sampling period by an autoregressive model in which the causal relationship of the past ammonia mole ratio and the outlet NOx concentration of the flue gas denitration device is identified by using data. An ammonia mole ratio correction signal 31 is decided so as to minimize the sum of both square integral value of control deviation between the future outlet NOx concentration of the flue gas denitration device and an outlet NOx concentration setting signal 35 and square integral value of variation every sampling period of the ammonia mole ratio.