Apparatus and methods of reheating gas turbine cooling steam and high pressure steam turbine exhaust in a combined cycle power generating system

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874471

Tomlinson, Leroy Omar ^[1]; Smith, Raub Warfield ^[2]

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1. Niskayuna, NY
2. Ballston Lake, NY

In a combined cycle system having a multi-pressure heat recovery steam generator, a gas turbine and steam turbine, steam for cooling gas turbine components is supplied from the intermediate pressure section of the heat recovery steam generator supplemented by a portion of the steam exhausting from the HP section of the steam turbine, steam from the gas turbine cooling cycle and the exhaust from the HP section of the steam turbine are combined for flow through a reheat section of the HRSG. The reheated steam is supplied to the IP section inlet of the steam turbine. Thus, where gas turbine cooling steam temperature is lower than optimum, a net improvement in performance is achieved by flowing the cooling steam exhausting from the gas turbine and the exhaust steam from the high pressure section of the steam turbine in series through the reheater of the HRSG for applying steam at optimum temperature to the IP section of the steam turbine.

• Research Organization: General Electric Co., Schenectady, NY (United States)
• DOE Contract Number: FC21-95MC31176
• Assignee: General Electric Company (Schenectady, NY)
• Patent Number(s): US 6397575
• OSTI ID: 874471
• Country of Publication: United States
• Language: English

Related Subjects

apparatus
methods
reheating
gas
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cooling
steam
pressure
exhaust
combined
cycle
power
generating
multi-pressure
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recovery
generator
components
supplied
intermediate
section
supplemented
portion
exhausting
hp
flow
reheat
hrsg
reheated
inlet
temperature
optimum
net
improvement
performance
achieved
flowing
series
reheater
applying
gas turbine
steam generator
heating gas
cycle power
steam turbine
combined cycle
pressure steam
turbine exhaust
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