| 摘要 |
PROBLEM TO BE SOLVED: To prevent the adhesion of unburnt carbon to the tip end unit of a nozzle due to the mist of oil fuel when the oil fuel is employed in the pilot nozzle. SOLUTION: Oil fuel 10 is supplied from an oil fuel supplying pipe 3 and is injected through an oil fuel injection port 5 to burn the same. Air 11 is guided from a circumferential air passage 2 and is injected from an air injection port 6 to diffuse the fuel. A water injection port 8 is provided around the oil fuel injection port 5 to cool the circumference of the injection port 5 by injecting water 9. A cover ring 13, covering the outside of the air injection port 6 so as to cover the circumference annularly by being extended into the direction of central axis of the nozzle while the central part of the same is opened, is provided. The injected air 11 flows into the direction of the central axis as shown by arrow signs 11a in a diagram, then, is dispersed to invade into the tip end unit and blow off mist, trying to adhere to the tip end unit, whereby the adhesion, carbonization and accumulation of the mist as unburnt carbon as well as the blocking of the water injection port by the unburnt carbon can be prevented.
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