Patent ID: 8186935

Claim:
A steam turbine comprising: a casing including a steam inlet and an exhaust, the casing enclosing operative structure of the steam turbine, wherein the steam inlet is adapted to introduce an operative steam flow in to the casing and the exhaust is adapted to enable a portion of the operative steam flow to exit the casing; a valve controlling introduction of a control steam flow at a location of the steam turbine, the control steam flow impacting an enthalpic condition of the portion of the operative steam flow exiting the casing via the exhaust; and a controller controlling operation of the valve to attain a desired enthalpic condition of the portion of the operative steam flow exiting the casing via the exhaust, wherein the controller is adapted to adjust a position of the valve based on the enthalpy of the portion of the operative steam flow exiting the casing via the exhaust.