Alstom Technology Limited

Ulf Schirmeister

Mengbin Zhang

Klaus-Dieter Liedtke

Aysegul Kirecci

A method for operating a gas turbine includes supplying fuel via at least one control valve regulated using an open-loop control system based on a predetermined load setpoint value. A valve stroke control command (s) is generated based on a fuel mass flow control command (m) using a mass flow-valve stroke converter. The valve stroke control command (s) is compared with a valve stroke limit value (min{s, s}) using a variable pressure regulator. A load limit value is generated if the valve stroke control command (s) exceeds the valve stroke limit value (min{s, s}) to reduce the load setpoint value. Operation of the gas turbine is stabilized using a low limit value (x) of a pressure drop ratio (x), wherein the pressure drop ratio (x) is a quotient of a pressure drop (dp) which occurs at the control valve and of a pressure (p) upstream of the control valve.

Method for operating a gas turbine

The disclosure relates to a method for operating a gas turbine plant which is supplied with a fuel gas via a compressor station. The compressor station includes a compressor which compresses the fuel gas which is fed via a gas feed line and delivers it via at least one control valve to a combustion chamber of the gas turbine plant. A bypass system is arranged in parallel to the compressor via which fuel gas can be directed in a switchable manner past the compressor to the at least one control valve. An energy-saving operation can be achieved in a simple manner by continuously measuring the fuel gas pressure at the outlet of the at least one control valve. A minimum fuel gas pressure, which is desired (e.g., necessary) for operation of the gas turbine, at the inlet of the at least one control valve is determined from the measured pressure values in each case. The compressor station can be switched over to bypass operation when the fuel gas pressure which reaches the inlet of the at least one control valve via the bypass system is greater than or equal to the minimum fuel gas pressure.

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Endingen, Switzerland

Ulf Schirmeister