| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion device realizing low NOx.SOLUTION: This invention comprises a primary fuel nozzle 37 arranged inside an air box 32, a flame holder 41 arranged around the primary fuel nozzle 37, and a plurality of secondary fuel nozzles 52 placed at an outer peripheral side of the flame holder 41 and spaced apart to each other in a peripheral direction on the annular region around the primary fuel nozzle 37. A plurality of secondary air nozzles 62 are arranged at the outer periphery of the flame holder 41, spaced apart to each other on the annular region and arranged at the front plate of the air box 32, the plurality of secondary air nozzles 62 and the plurality of secondary fuel nozzles 52 are alternatively arranged. Due to this arrangement, the fuel gas got from the secondary fuel nozzle 52 is gradually mixed to the re-circulation flow, ignited gradually to reduce NOx.SELECTED DRAWING: Figure 1 |
