| 摘要 |
<p>PURPOSE:To suppress NOx to a predetermined value or less in an optimum NOx removing substance blow-in amount, by mounting a blow-in amount control means for receiving the information of the combustion state relating to a NOx generation amount and changing the blow-in amount control signal of a NOx removing substance on the basis of said information. CONSTITUTION:A NOx densitometer 5 detects the amount of NOx in exhaust gas to send the measuring signal to a subtractor 6 and the deviation with a NOx set value NS is sent to a blow-in amount feedback control part 7 which, in turn, sends a blow-in control signal to an adder 8 so as to set the deviation to 0. The detection signals from a furnace internal thermometer 11, a furnace outlet thermometer 12, a combustion air flowmeter 13, an exhaust gas O2- densitometer 14 and a steam flowmeter 15 are sent to a generated NOx amount estimation device 16 and a control signal is sent to the adder 8 through a blow-in amount feedforward control part 17. The adder 8 sends a blow-in control signal of a necessary amount of NH3 to a NH3 blow-in apparatus 9.</p> |
