| 摘要 |
<p>PURPOSE: To carry out a self exhaust-gas recirculation 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 of a fuel tube and side fuel injection pipes are installed at one side of the air injection units while fuel injection ports are radially 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 other side fuel injection units 6, injecting fuel circumferentially, are provided at the side of the fuel injection pipes 5. Further, radial fuel injection ports 14 are provided at the tip end part of the fuel tube 1 while a disc plate 7 is provided at the upstream side of the fuel injection ports 14. In this case, 10-20% of total fuel is injected radially from the radial fuel injection ports 14 as auxiliary fuel and the combustion gas in a furnace is burnt by the energy of the injection while being whirled. The ratio of air flow speed at the air injection unit 3 to the fuel flow speed at the fuel injection units 6 is specified so as to be 0.2 or more.</p> |
