| 摘要 |
PROBLEM TO BE SOLVED: To provide a further lower NOx formation by a method wherein a combustion rate of lean flame is increased or a concentration of the lean flame is made to be further low. SOLUTION: There are provided a lean flame port 12 communicated with a lean gas chamber 11 for supplying lean mixture gas; a first flame port 14 communicated with a first mixture gas chamber 13 adjacent to the lean gas chamber 11 and adjacent to the lean flame port 12; and a second flame port 17 communicated with a second mixture gas chamber 16 adjacent to the first mixture gas chamber 13 and arranged adjacent to the first flame port 14. A concentration of the first mixture gas chamber 13 is made thicker than that of the second mixture gas chamber 16, and a width of a flame port rim between the lean flame port 12 and the first flame port 14 is made smaller than a width of the flame port rim between the first flame port 14 and the second flame port 17. With such an arrangement as above, the rich mixture gas is not made lean with the lean mixture gas, but dispersion of substances from the rich mixture gas is promoted, so that even in the case of much amount of lean flame, it is stabilized and ultra-low NOx combustion can be realized.
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