| 摘要 |
PROBLEM TO BE SOLVED: To ensure stabilized combustion while reducing nitrogen oxide by introducing fuel jet and oxidizing agent simultaneously into a main combustion zone and arranging each introduction point of main oxidizing agent jet such that the closest introduction point of fuel jet satisfies a specified formula. SOLUTION: A central fuel jet 4 and two main oxidizing agent jets 7, 8 are introduced simultaneously into a main combustion zone 2. An introduction point being defined by arrangement of a fuel injector 3 and oxidizing agent injectors 5, 6 is set such that the distance D between the introduction point of the fuel jet 4 and the introduction point of each main oxidizing agent jet 7, 8 satisfies a formula; D/√A>5 (preferably, >10) and/or D/√B>5 (preferably, >10). The distance D represents the minimum distance between the outer end part of the concerned oxidizing agent jet 7 or 8 at each introduction point and the outer end part of the fuel jet 4 and A and B represent the cross-section of the oxidizing agent jet 7 or 8 at the introduction point.
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