| 摘要 |
<p>PURPOSE: To recirculate own exhaust effectively and realize low NOx combustion by a method wherein a shielding plate, provided with a plurality of slot-type air injection units, is installed around the tip end part of a fuel tube and side fuel injection pipes are installed at one side of the air injection units while fuel injection ports are axially provided at the tip end part of the fuel tube. CONSTITUTION: A shielding plate 4, provided with a plurality of slot type air injection units 3, is installed around the outer periphery of tip end part of a fuel tube 1 and side fuel injection pipes 5 are installed at one side of the air injection units 3 while the other side fuel injection unit 6, injecting fuel circumferentially, are provided at the side of the fuel injection pipes 5. Fuel injection ports 14 are radially provided at the tip end part of the fuel tube 1 while a disc plate 7 is installed at the upstream side of the fuel injection ports 14. In this case, 10-20% of total fuel is injected axially from the fuel injection ports 14 are auxiliary fuel and combustion gas in a furnace is burnt by the energy of the injection while being whirled. The ratio or air flow speed at the air injection units 3 to the fuel flow speed at the fuel injection units 6 is specified so as to be 0.2 or more.</p> |
