Patent ID: 8393138

Claim:
A steam generator, comprising: a) a main duct in fluid communication with a gas turbine engine; b) a furnace in fluid communication with the main duct, the furnace comprising: i) a combustion chamber having a first axial end and a second axial end; and ii) a burner located proximate to the first axial end; c) a heat exchanger having a first chamber physically separate from and in thermal communication with a second chamber, the first chamber either in fluid communication with the main duct or being part of the main duct, the first chamber in fluid communication with the second axial end of the combustion chamber; and d) a recirculation system, comprising: i) a first diverter damper in fluid communication with the first chamber of the heat exchanger and a recycle duct; ii) the recycle duct in fluid communication with the diverter damper and a mixing damper; and iii) the mixing damper in fluid communication with main duct and fresh air; e) an oxygen-enrichment system, comprising i) a source of oxygen-enriched gas in fluid communication with the burner via an oxygen line.