| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-positional control burner which can effectively suppress the production of NOx at high load combustion. SOLUTION: Fuel oil of the quantity geared to high load combustion or low load combustion is sprayed into a combustion chamber 2 from a fuel oil spray nozzle 13 which constituted one piece of constant supply oil pressure return type spray valve structure arranged in a burner throat 11. Primary air 16a less than the theoretical combustion air quantity is supplied in whirling flow into the combustion chamber 2 from the burner throat 11, and also secondary air 16b of the quantity equivalent to or less than the primary air 16a is supplied into the combustion chamber 2 from plural air jet nozzles 18 provided at the side of the burner throat 11. The air jet nozzle 18 is, in the peripheral circular region of the burner throat 11, arranged in condition that it is inclined to the axis of the combustion chamber 2, so that it may jet the secondary air 16b toward the center on downstream side of the primary combustion part 46 by the primary air 16a and that the jetted air current 56 from the air jet nozzle 18 may not interfere with it upstream of it.
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