To prevent slagging from occurring by providing a swirling device for swirling and injecting secondary air for combustion around a fuel injection nozzle and a plurality of tertiary air nozzles for injecting tertiary air from around the swirling device into an interior of a furnace without swirling the tertiary air.
A nozzle 41 for pulverized coal having a flame stabilizer 43 provided at an end portion is provided with a start-up oil burner 42 inserted in a center thereof and secondary and tertiary air is fed as combustion air. The combustion air is regulated at a specified flow rate by means of a flow regulating damper 44 before being fed as secondary air 45 and tertiary air 46. The secondary air 45 is swirled around the nozzle 41 for pulverized coal by a swirling vane 47 and is fed into an interior of a furnace. Secondary air resistor 48 is provided as a swirling device besides the swirling vane 47 in order to intensify swirling of the secondary air. The tertiary air 46 is injected from a tertiary air nozzle in a direction of injection fumed about a burner throat. Slag can be removed without influence of burner capacity by employing the tertiary air injecting method as described above.
NOMURA SHINICHIRO
OYATSU NORIBUMI
MEGURI NOBUYASU
KIYAMA KENJI
