PROBLEM TO BE SOLVED: To restrain the generation of unburnt hydrocarbon upon igniting and fire distinguishing by a method wherein fuel is burnt by only concentrated flame temporarily upon igniting, in a low-NOx combustion device. ;SOLUTION: Fuel, supplied from a fuel supplying system 19, is passed through an intercepting valve 11 and the flow rate thereof is regulated by a proportional valve 17 so as to have a predetermined value, then, the flow of the fuel is branched into a concentrated fuel supplying system 12 and a thin fuel supplying system 13 to inject from a concentrated fuel nozzle 14 and a thin fuel nozzle 15 into a concentrated fuel burner 10 and a thin fuel burner 11. The flow of air, supplied from a fan 21, is regulated by a flow regulating unit 22 at the bottom part of a burner case 20 so as to be uniform flow and, thereafter, the air is supplied from an air supplying port into the burners. The air is mixed into the fuel, supplied from the concentrated fuel nozzle 14, in the concentrated fuel burner and the mixture flows out through a flame port as concentrated mixture, concentrated much more than a logical mixing ratio, and the mixture is ignited by an igniter 23 to form stabilized concentrated flame. According to this method, the discharging concentration of unburnt hydrocarbon upon igniting can be reduced remarkably.;COPYRIGHT: (C)1999,JPO
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