| 摘要 |
PURPOSE:To reduce the generating amount of nitrogen oxides by a method wherein a burner head, provided with a plurality of primary flame ports at the side surface thereof, and a primary combustion chamber, covering the burner head and provided with secondary flame ports, are provided while a secondary air supplying passageway is provided in the burner head and the primary combustion chamber so as to penetrate them. CONSTITUTION:A burner head 18, provided with a plurality of primary flame ports 20 on the side surface thereof, is covered by a primary combustion chamber 22, provided with secondary flame ports 23 on the upper part thereof, while a secondary air supplying passageway 24 is provided in the burner head 18 and the primary combustion chamber 22 so as to penetrate them. Primary combustion in the primary combustion chamber 22 is effected in a degree higher than a combustible limit effected by the primary air principally and lower than the same effected by the logical amount of air. As a result, the generating amount of nitrogen oxides (NOx), especially that of nitrogen dioxide NO2, may be reduced.
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