Patent ID: 8166766

Claim:
A method of operating a turbomachine system to generate electricity, the method comprising: permitting a portion of turbomachine exhaust to be received in a first heat recovery steam generator (HRSG) for delivery to a compressor of the turbomachine and a remaining portion of the turbomachine exhaust to be received in a second HRSG in which Oxides of Nitrogen (NOx) and Carbon Monoxide (CO) in the turbomachine exhaust are consumed; sensing whether the NOx and the CO consumption in the second HRSG is substantially complete; and in an event the NOx consumption is incomplete, modulating the relative amounts of the portion and the remaining portion of the turbomachine exhaust respectively received in the first and second HRSGs and, in an event the CO consumption is incomplete, modulating an amount of air injected into the second HRSG.