Exhaust gas treatment facility

An exhaust gas treatment facility for treating exhaust gas discharged from a coal-fired boiler in a thermal power generation facility, the exhaust gas treatment facility comprising:

• a control valve controlling an injection amount of a reducing agent to be injected into exhaust gas flowing from the coal-fired boiler toward a denitrification reactor of a denitrification device;
• and
• a control system controlling a valve opening degree of the control valve,
• wherein the control system includes:
• a first predictor, based on a first operation data which is operation data of the thermal power generation facility at a first time point, predicting a first concentration, which is a concentration of nitrogen oxides in the exhaust gas flowing from the coal-fired boiler toward the denitrification reactor at a second time point after a predetermined period of time from the first operation data;
• a first calculator calculating a first needed flow rate which is a flow rate of the reducing agent at the second time point, needed to denitrify the nitrogen oxides such that a concentration of the nitrogen oxides is a target value or lower when the nitrogen oxides with the first concentration predicted by the first predictor are introduced into the denitrification device, and
• a controller controlling the valve opening degree of the control valve such that the injection amount at the second time point is based on a predicted value of the first concentration predicted by the first predictor and the first needed flow rate calculated by the first calculator,
• wherein the first operation data includes at least either one of a second operation data and a third operation data, the second operation data being operation data at the first time point of one or more coal pulverizers provided in the thermal power generation facility, and the third operation data being operation data at the first time point of the coal-fired boiler affected by variation in operation conditions of the one or more coal pulverizers.