| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of a boiler which can obtain stable boiler heat absorbing characteristics and a better steam temperature control characteristic by directly varying the recirculation of a gas according to an outlet gas temperature of a furnace for holding the absorption of heat at the furnace within a fixed changing range to restrict changes in the outlet gas temperature of the furnace. SOLUTION: In a boiler 20 which is provided with a furnace 1 to burn a fuel using a plurality of fuels different in combustion characteristics and heat transfer surface fouling characteristic, gas recirculation equipment to the furnace 1 and a reheating steam temperature control means other than the gas recirculation equipment, furnace outlet gas temperature detection means 11, 12, 13, 15 and 16 are arranged to actually measure the furnace outlet gas temperature or to evaluate the furnace outlet gas temperature by inversion calculated from a boiler operation data and the recirculation of the gas is directly varied according to a furnace outlet gas temperature data by the furnace outlet gas temperature detection means 11, 12, 13, 15 and 16 to control the heat absorption of the furnace.
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