Method and apparatus for introducing diluent flow into a combustor

摘要

Disclosed is a combustor including a baffle plate having at least one through baffle hole and at least one fuel nozzle extending through the at least one baffle hole. At least one shroud is secured to the baffle plate and includes at least one piston ring disposed at the shroud. The at least one piston ring is configured to meter a flow of diluent between the at least one shroud and the at least one fuel nozzle. Further disclosed is a method for providing diluent to a combustor including providing a piston ring gap defined by at least one piston ring disposed at a baffle plate and a fuel nozzle extending through a through hole in the baffle plate. The diluent is flowed through the piston ring gap toward at least one airflow hole in the fuel nozzle.

主权项

1. A combustor comprising:
a baffle plate including at least one through baffle hole; a cover ring disposed upstream of the baffle plate and defining a diluent plenum therewith, the cover ring including one or more orifices to guide a flow of diluent into the diluent plenum; at least one fuel nozzle extending through the at least one through baffle hole; at least one shroud secured to the baffle plate, the at least one shroud and the at least one fuel nozzle defining a flow channel therebetween extending from the diluent plenum through the baffle plate, the at least one shroud including at least one piston ring disposed at the at least one shroud, the at least one piston ring configured to control the flow of diluent from the diluent plenum and through the flow channel between the at least one shroud and the at least one fuel nozzle; and a plurality of air flow holes disposed in the at least one fuel nozzle, at least a portion of the flow of diluent flowing through a piston ring gap between the at least one fuel nozzle and the at least one piston ring and into the plurality of air flow holes for mixing with a flow of air and a flow of fuel in the at least one fuel nozzle.