System and Method for Controlling Gas Turbine Exhaust Energy Via Exhaust Gas Damper and Compressed Gas Supply

摘要

A system and method for controlling gas turbine exhaust energy for a gas turbine power plant is disclosed herein. The system includes a gas turbine having a combustor downstream from a compressor, a turbine disposed downstream from the combustor and an exhaust duct downstream from an outlet of the turbine. An exhaust gas damper is operably connected to a downstream end of the exhaust duct and a compressed gas supply is in fluid communication with the exhaust duct downstream from the turbine outlet and upstream from the exhaust gas damper. During operation of the gas turbine, the exhaust gas damper and the compressed gas supply increase backpressure at the turbine outlet and restrict axial exit velocity of the exhaust gas exiting the turbine outlet.