| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure the flow rate by narrowing down a flow channel cross sectional area when the flow rate of combustion air is small in changing the flow channel cross sectional area of combustion air by moving a member in the vertical direction and adequately mix the fuel with combustion air, in order to increase the turn-down ratio and attain the low air ratio combustion. <P>SOLUTION: A burner includes fuel nozzles 2, 3 for spraying the fuel, and air nozzles 26 which are provided at the position surrounding fore ends of the fuel nozzles 2, 3 to eject combustion air. The air nozzle 26 is formed in a cylindrical shape in which the flow channel cross sectional area of combustion air becomes smaller downwardly, and a part of a sidewall (movable sidewall 28) is vertically slidable. By the vertical slide of the movable sidewall 28, the size of an opening part of an outlet of the air nozzle 26 can be changed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
