| abstract |
Device for controlling NH3 injection in flue gas denitrification comprises: a system (8) measuring NOx concn. in exhaust gas entering a denitrification unit (3), a unit that determines an NH3 base quantity, a unit (28) emitting pulses in response to the exhaust gas flow rate and sharp NOx concn. changes, a unit emitting pulses corresp. to the difference between NOx observed and set values, a unit (32) metering the denitrification unit outlet NH3 concn., a unit (10) that forecasts residual NH3 concn. at the denitrification unit outlet on the basis of the exhaust gas NOx concn. denitrification rate and amt. of NH3 injected and a unit that outputs NH3 injection correction pulses based on the forecast residual NH3 concn. |