HEAVY OIL BURNING BOILER COMBUSTION METHOD AND HEAVY OIL FIRING BOILER

摘要

PROBLEM TO BE SOLVED: To provide a heavy oil burning boiler combustion method capable of suppressing reduction in reactivity of char.SOLUTION: In a heavy oil burning boiler combustion method for introducing a heavy oil fuel and an atomized fluid into fuel sprayers of combustion burners to mix the heavy oil fuel with the atomized fluid; and injecting a mixture fluid containing oil atomized particles Po as well as combustion air into a furnace to burn the mixture fluid and the combustion air, the combustion air is supplied by regulating an air volume thereof to an air volume of primary air set to be equal to or smaller than a theoretical air volume necessary to burn a volatile component G of the atomized oil particles Po, the primary air being supplied from surroundings of the fuel sprayer, and to an air volume of secondary air supplied stepwise so as not to exceed a highest temperature in a combustion zone by the primary air.