CONTROL METHOD OF INJECTED STEAM FLOW RATE INTO GAS TURBINE

摘要

PROBLEM TO BE SOLVED: To provide a control method of injected steam flow rate improving thermal efficiency and reducing noise by setting a sufficiently large target value of steam flow injectable into a gas turbine without causing misfire or other problems at the start of steam injection.;SOLUTION: Steam is generated with high temperature exhaust gas of the gas turbine and injected into the gas turbine. The target steam flow rate is computed from a turbine inlet temperature at the start of injection, and the turbine inlet temperature drops with steam injection. A lowered value of the target steam flow rate is thereby predicted, and the target steam flow rate is decreased beforehand by that portion. A rate limiter for the target steam flow rate is provided, and a change rate is suppressed to small to compensate a time-lag of a flow meter.;COPYRIGHT: (C)2005,JPO&NCIPI