Patent ID: 6679046
Filing Date: 2004-01-20
Classification: F01D,F01K,F02C,F05D,Y02E

Abstract:
A single-shaft combined plant comprising a gas turbine and a steam turbine connected together by a single shaft, and a clutch interposed between the gas turbine and the steam turbine, whereby the gas turbine and the steam turbine can be connected to or disconnected from each other, further comprising:an emergency shut-off oil system including a gas turbine emergency shut-off oil line, and a steam turbine emergency shut-off oil line, and wherein when a tripping valve provided on the gas turbine emergency shut-off oil line is opened, an emergency shut-off oil is released from a valve provided on a fuel supply line via the gas turbine emergency shut-off oil line, whereby only the valve provided on the fuel supply line is shut off to stop supply of a fuel to the gas turbine, when a tripping valve provided on the steam turbine emergency shut-off oil line is opened, an emergency shut-off oil is released from a valve provided on a steam supply line via the steam turbine emergency shut-off oil line, whereby only the valve provided on the steam supply line is shut off to stop supply of steam to the steam turbine, a master tripping valve is connected to the gas turbine emergency shut-off oil line and the steam turbine emergency shut-off oil line via check valves, and when the master tripping valve is opened, the emergency shut-off oils are released from the valve provided on the fuel supply line and the valve provided on the steam supply line via the gas turbine emergency shut-off oil line and the steam turbine emergency shut-off oil line, whereby both the valve provided on the fuel supply line and the valve provided on the steam supply line are shut off to stop supply of the fuel to the gas turbine and supply of the steam to the steam turbine.