US 11,852,074 B1
Combined cycle power plants with exhaust gas recirculation intercooling
Raub Warfield Smith, Ballston Lake, NY (US)
Assigned to GENERAL ELECTRIC COMPANY, Schenectady, NY (US)
Filed by GENERAL ELECTRIC COMPANY, Schenectady, NY (US)
Filed on Jul. 12, 2022, as Appl. No. 17/863,011.
Int. Cl. F02C 7/18 (2006.01); F01K 23/10 (2006.01); F02C 3/34 (2006.01); F02C 7/143 (2006.01)
CPC F02C 7/185 (2013.01) [F01K 23/101 (2013.01); F02C 3/34 (2013.01); F02C 7/143 (2013.01); F05D 2220/31 (2013.01); F05D 2220/32 (2013.01); F05D 2220/62 (2013.01); F05D 2220/72 (2013.01); F05D 2260/213 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A combined cycle power plant comprising:
a gas turbine engine comprising a compressor having a compressor inlet, a compressor outlet, and an interstage inlet defined therebetween, the gas turbine engine further comprising a turbine outlet configured to discharge a first exhaust gas stream therefrom;
a heat recovery steam generator configured to:
receive the first exhaust gas stream therein;
extract heat from the first exhaust gas stream; and
discharge a second exhaust gas stream therefrom;
a recirculation compressor configured to selectively pressurize a first portion of the second exhaust gas stream for recirculation towards the compressor;
a first cooler configured to cool the first portion of the second exhaust gas stream after compression, thereby defining a cooled exhaust gas stream, wherein the first cooler discharges the cooled exhaust gas stream to the interstage inlet of the compressor; and
a controller configured to modulate the flow and temperature of the first portion of the second exhaust gas stream recirculated towards the compressor to facilitate increasing the output of the combined cycle power plant.