Self purging dual fuel injector

摘要

A self purging dual fuel injector has a valve which is pressed down, as opposed to lifting, to provide a pilot charge to the combustion chamber. As the valve further extends from the injector the pilot fuel flow is cut off and coal water slurry flows through the valve to the combustion chamber. During shut off of the slurry the retracting valve allows a shot of pilot fuel to purge the valve passageways.