| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for regulating the amount of NH3 of a denitration apparatus which can reduce regulating elements for decreasing the deviation of the measure value of NOx at the outlet of the denitration apparatus from a set value and find out an optimum amount of NH3 for correction. SOLUTION: This apparatus is equipped with a means for obtaining a total amount of NOx from a gas flow rate at the inlet of a denitration apparatus and the output of an NOx meter at the inlet, an operation part for obtaining a necessary mole ratio from NOx concentrations at the inlet and outlet of the denitration apparatus, a means for obtaining the amount of NH3 to be injected from the total amount of NOx and the necessary mole ratio, a one step differential circuit for obtaining a bias value of NH3 to be injected precedingly which is added only when a load is changed, and a flow-regulating valve for NH3 regulated on the basis of the bias value and the amount of NH3 to be injected. At the start of the change of the load based on a load command, the amount of NH3 to be injected is corrected by operating a flow regulating valve 2 for the amount of NH3 in one stroke to a valve travel through a setting device 17a which sets up a valve travel corresponding to each load in advance at the arrival of the change of the load. |
