Systems and methods for increasing power output in a waste heat driven air brayton cycle turbocharger system

A system for use with a power generator having a rotary machine including a first combustor and an exhaust passage flowing exhaust gases from the first combustor, comprising:

• a heat exchanger positioned in the exhaust passage;
• a turbocharger system, comprising:
• at least one first turbocharger including a first turbine fluidly coupled to an outlet of the heat exchanger, the first turbine adapted to receive gas flow from the heat exchanger, and a first compressor fluidly coupled to an inlet of the heat exchanger, the first compressor adapted to supply compressed air to the heat exchanger;
• at least one second turbocharger including a second turbine fluidly coupled to the outlet of the heat exchanger, the second turbine adapted to receive gas flow from the heat exchanger, and a second compressor fluidly coupled to the rotary machine, the second compressor adapted to receive gas flow from the first compressor and supply compressed air to the rotary machine;
• and
• an auxiliary, second combustor adapted to inject heated exhaust gases into a first flow path arranged between the outlet of the heat exchanger and an inlet to each of the second turbine and the first turbine;
• and
• a controller with computer readable instructions stored in memory, that when executed during operation of the power generator, cause the controller to adjust a fueling rate of fuel supplied to the second combustor for combustion based on a desired operating point for a desired power output of the rotary machine.