| 摘要 |
<p>PURPOSE: To carry out a self exhaust-gas recirculation effectively before starting combustion, and realize a low NOx combustion by a method wherein a shielding plate, provided with a plurality of slot-type air injection units, is installed around the outer periphery of tip end part of a fuel tube while a fuel injection ports are provided radially at the tip end part of the fuel tube projected from the shielding plate. CONSTITUTION: A shielding plate 4, inscribed with the inner peripheral surface of an air pipe 2 and provided with a plurality of slot-type air injection units 3, is installed at the outer periphery of tip end part of a fuel tube 1. A base part fuel injection pipe 5 is installed at the base part of the injecting units 3 while another base part fuel injection units 6, injecting fuel radially, is provided at the tip end of the fuel injection pipe 5. Further, fuel injection ports 16 are provided radially at the tip end part of the fuel tube 1 while a disc plate 9 is provided at the upstream side of the fuel injection ports 16. In this case, 10-20% of total fuel is injected radially from the fuel injection ports 16 as auxiliary fuel to burn combustion gas by the energy of injection. The ratio of an air flow speed at the air injecting units 3 to the fuel flow speed at the fuel injection units 6 is specified so as to be 0.2 or more.</p> |
