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

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874605

Burdgick, Steven Sebastian ^[1]; Burns, James Lee ^[1]

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1. Schenectady, NY

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.

• Research Organization: General Electric Co., Schenectady, NY (United States)
• DOE Contract Number: FC21-95MC31176
• Assignee: General Electric Company (Schenectady, NY)
• Patent Number(s): US 6422810
• OSTI ID: 874605
• Country of Publication: United States
• Language: English

Related Subjects

exit
chimney
joint
method
forming
closed
circuit
steam
cooled
gas
turbine
nozzles
nozzle
segment
inner
outer
band
portions
vane
extending
divided
plenums
separated
impingement
plate
cooling
supplied
cavity
flow
apertures
cool
wall
flows
leading
edge
portion
spent
plurality
cavities
exiting
secured
directly
surrounding
margin
location
intermediate
margins
cover
externally
accessible
formation
subsequent
inspection
gas turbine
closed circuit
nozzle segment
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