Multiple staged compressor with last stage airfoil cooling

摘要

An industrial gas turbine engine in which a compressor includes later stage airfoils that are cooled using a coolant from an external closed loop cooling circuit or from a heat recovery steam generator. Cooling air compressed by a compressor external to the IGT engine can be used for cooling of the main compressor airfoils with a heat exchanger to preheat a fuel used in the combustor. Or, water and steam from a heat recover steam generator can be used to cool the compressor airfoils in which steam can be bled off from the steam generator for cooling and then reintroduced into the HRSG at a downstream stage. Steam is used to cool the rotor blades while water is used to cool the stator vanes.

主权项

1. A gas turbine engine comprising:
a multiple stage compressor with stages of stator vanes and rotor blades; a combustor; a turbine; a heat exchanger; a compressor driven by a motor; the compressor providing compressed air to the combustor that is burned with a fuel to produce a hot gas stream that is passed through the turbine; and, a closed loop cooling circuit passing through the compressor and the heat exchanger and a row of stator vanes or rotor blades of the multiple stage compressor to provide cooling for the row of stator vanes or rotor blades.