| 摘要 |
PURPOSE:To allow for sufficient turndown through a simple construction without limitation of a flow rate of the air for combustion and oxygen concentration in the air, by a method wherein a plurality of fuel injection nozzles, being different in a nozzle size, and a plurality of fuel-air premixture injection nozzles, being different in a nozzle size, are alternately formed in a fuel pipe and a front panel. CONSTITUTION:An air guide vane 1, widened toward the end, is attached to one side of a fuel pipe 3, a slitform gap 2 is provided between the fuel pipe 3 and the base of the air guide vane 1, and the fuel pipe 3 and the air guide vane 1 are secured by means of several securing plates therebetween. A plurality of large fuel injection nozzle hole 4A and plural small nozzle holes 4B are alternately formed in the front of the fuel pipe 3. Further, a fuel-air premixture chamber 5 is formed by surrounding it by means of the fuel pipe 3, the air guide vane 1, and a front panel 5B. Plural large fuel-air premixture injection nozzles 7A and plural small fuel-air premixture injection nozzles 7B are alternately provided in the front panel 5B of a fuel-air premixture chamber 5. |
