| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize an NOx concentration at the exit of an exhaust gas denitrizer. <P>SOLUTION: In the controller 8 of an NOx treatment facility 1, a feed-forward control part 81 obtains a molar ratio on the basis of a denitfication rate target value obtained by subtracting an exit NOx concentration target value from an entrance NOx concentration measured value and dividing the value by the entrance NOx concentration measured value. An ammonia injection amount obtained by mulyiplying the molar ratio, the entrance NOx concentration measured value and a combustion gas amount predicted value computed from a fuel flow rate is output to an adder A1. A feedback control part 82 outputs the larger one of an exit NOx concentration deviation correction signal from a subtractor S1 and the change amount of the entrance NOx concentration measured value from a differentiator D1 to the adder A1. An adder A2 adds the change amount of the entrance NOx concentration measured value, the change amount of a burner combustion number, and the change amount of generator output and performs output to the adder A1. A subtractor S2 outputs a difference between an ammonia flow rate measured value from a flow rate measuring instrument 7 and an ammonia flow rate set value from the adder A1 to an PID control part 84. <P>COPYRIGHT: (C)2011,JPO&INPIT |
