Patent ID: 8430665
Filing Date: 2013-04-30
Classification: F23C,F23D,F23L

Abstract:
1. A process for using a combustion system, said process comprising: supplying a first injection of hydrocarbon fuel and an injection of primary air under fuel rich conditions to a combustion zone comprising a burner to form a flue gas; channeling the flue gas to an intermediate staged air zone that includes an intermediate staged air inlet downstream of the combustion zone; supplying intermediate staged air to the flue gas through the intermediate staged air inlet downstream of the combustion zone to produce fuel lean conditions within the intermediate staged air zone; regulating the flow of intermediate staged air into the intermediate staged air zone via at least one damper positioned between the combustion zone and the intermediate staged air inlet such that the stoichiometric ratio within the intermediate staged air zone is maintained at greater than 1; and channeling the flue gas to pass to a reburn zone downstream from the intermediate staged air inlet, such that said intermediate staged air zone is defined between said combustion zone and said reburn zone and receiving a second injection of hydrocarbon fuel for producing fuel rich conditions within said reburn zone channeling the flue gas downstream to a burnout zone downstream from the reburn zone, wherein the burnout zone receives an injection of overfire air and producing fuel lean conditions within the burnout zone.