| 摘要 |
PURPOSE:To improve heat transfer efficiency by providing a plurality of fuel injection nozzles and combustion air holes on a burner annularly arranged in the center part of a combustion chamber. CONSTITUTION:A heater 11 is annularly arranged in the center part of a combustion chamber 37, and an annular burner 18 is arranged in the lower part of the outside of the heater 11. This burner 18 has a plurality of fuel injection nozzles 40 and combustion air holes 36, and one side holes of both kinds are provided at the joint face 45 between the upper and lower parts of the burner. Further, a tapered face 48 is provided on the inner circumferential surface of the burner 18. As the burner 18 arranged in the lower part of the outside of the annular heater 11 can simultaneously emit combustion air and fuel and generate high temperature combustion gas on the outer circumferential side of the heater and let the gas flow to the inner circumferential side of it, the heat transfer efficiency can be improved. Further, as the burner 18 is of a split construction, mutual direction and numbers of the holes 36 and 40 can be optionally selected. |
