LEAN PREMIXING TYPE COMBUSTION APPARATUS AND ITS CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a lean premixing type combustion apparatus and a control method for the apparatus, which has excellent follow-up performance to load fluctuation while maintaining stable lean premixing combustion by keeping the air-fuel ratio of premixing burners constant even in the transient state where load suddenly fluctuates.;SOLUTION: The lean premixing type combustion apparatus comprises: the premixing burners 21, 35; a diffusion burning type reheating burner 47; an air flow acquiring means 49 acquiring premixing burner air flow passing through the premixing burners 21, 35; a fuel flow setting part 50 setting a first fuel supply amount to the premixing burners 21, 35 to obtain a constant air-fuel ratio, based on the acquired premixing burner air flow and setting a second fuel supply amount to the reheating burner 47 by subtracting the first fuel supply amount from a total fuel supply amount corresponding to load; and a fuel supply valve part 51 supplying fuel F to each of the premixing burners 21, 35 and reheating burner 47 to obtain the set first and second fuel supply amounts.;COPYRIGHT: (C)2008,JPO&INPIT