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Exit chimney joint and method of forming the joint for closed circuit steam cooled gas turbine nozzles

United States Patent

July 23, 2002
View the Complete Patent at the US Patent & Trademark Office
A nozzle segment for a gas turbine includes inner and outer band portions and a vane extending between the band portions. The inner and outer band portions are each divided into first and second plenums separated by an impingement plate. Cooling steam is supplied to the first cavity for flow through the apertures to cool the outer nozzle wall. The steam flows through a leading edge cavity in the vane into the first cavity of the inner band portion for flow through apertures of the impingement plate to cool the inner nozzle wall. Spent cooling steam flows through a plurality of cavities in the vane, exiting through an exit chimney in the outer band. The exit chimney is secured at its inner end directly to the nozzle vane wall surrounding the exit cavities, to the margin of the impingement plate at a location intermediate the ends of the exit chimney and to margins of an opening through the cover whereby each joint is externally accessible for joint formation and for subsequent inspection.
Burdgick; Steven Sebastian (Schenectady, NY), Burns; James Lee (Schenectady, NY)
General Electric Company (Schenectady, NY)
09/ 578,006
May 24, 2000
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has rights in this invention.