| 摘要 |
PROBLEM TO BE SOLVED: To provide a low NOx formation and assure a variable range of combustion amount by increasing a combustion rate of lean flame or by further making lean concentration of the lean flame. 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; 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 flow rates of the lean mixture gas, the first mixture gas and the second mixture gas can be increased or decreased under the same rate. With such an arrangement as above, even if 'the high temperature and high reaction region' where an active combustion reaction is attained increases or decreases the amount of combustion, it may always be formed. Thus, a concentration of the lean mixture gas is decreased to enable an ultra-low NOx formation to be attained and at the same time, it is possible to keep a high variable range of combustion amount maintaining a superior combustion.
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