Patent ID: 8302545

Claim:
A fuel-fired furnace comprising: a primary combustion zone configured to produce combustion gases; an intermediate air zone downstream from said primary combustion zone, said intermediate air zone configured to inject an intermediate air stream into the combustion gases; a reburning zone downstream from said intermediate air zone such that said intermediate air zone is defined between said primary combustion zone and said reburning zone, said reburning zone comprising an injector configured to inject fuel into the combustion gases; a burnout zone downstream from said reburning zone, said burnout zone configured to inject an overfire air stream into the combustion gases; at least one burner within said primary combustion zone configured to inject a fuel stream and a windbox air stream into said primary combustion zone; at least one hybrid-boosted intermediate air injector within said intermediate air zone, said at least one hybrid-boosted air intermediate injector configured to substantially simultaneously inject a boosted air stream and a windbox air stream into the combustion gases; and at least one hybrid-boosted overfire air injector within said burnout zone, said at least one hybrid-boosted overfire air injector configured to substantially simultaneously inject the boosted air stream and the windbox air stream into the combustion gases.