Overspeed protection method for a gas turbine/steam turbine combined cycle

Patent Application · Tue Aug 27 00:00:00 EDT 1991

OSTI ID:5782420

Moore, J H

This patent describes a method for achieving overspeed protection in a combined cycle gas and steam turbine power plant. It comprises solidly coupling together to rotate at all times as a single rotor unit, including during sudden loss of load occurrences, the rotating members of a gas turbine with its associated combustor and air compressor, a high pressure steam turbine at least one lower pressure stream turbine and an electrical generator; transferring heat from the gas turbine exhaust to steam exhausted from the high pressure steam turbine in a steam reheater before it is input to the at least one lower pressure steam turbine; connecting an output of the steam reheater with an input of the lower pressure steam turbine via a valveless steam conduit; and using a single overspeed control to detect a sudden loss of load occurrence and, in response, simultaneously reducing steam input to the high pressure steam turbine and reducing fuel input to the gas turbine combustor while permitting residual reheater output to continue to expand freely through the at least one lower pressure steam turbine.

• Assignee: General Electric Co., Schenectady, NY (USA)
• Application Number: PPN: US 7-590940
• OSTI ID: 5782420
• Resource Relation: Patent File Date: 1 Oct 1990
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
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ON-LINE CONTROL SYSTEMS
GAS TURBINES
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STEAM TURBINES
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