Catalytic combustor having secondary fuel injection for low...

F - Mech Eng,Light,Heat,Weapons – 02 – C

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60/173

F02C 3/00 (2006.01)

Patent

CA 1245060

13 ABSTRACT OF THE DISCLOSURE A combustor basket is provided with an outer tubular sidewall which is coupled to a catalytic unit at its downstream end. An inner tubular sidewall extends from the upstream end of the basket to a downstream point where a secondary mixing zone begins within the basket. An annular space between the two tubular sidewalls forms a primary combustion zone from which combustion products flow to the downstream secondary zone. The combustor basket is provided with plural primary nozzles z about the annular space at its upstream end to provide fuel for conventional combustion and dilu- tion in the primary zone. A plurality of secondary nozzles are provided for fuel injection through the inner tubular sidewall at the downstream end of the primary zone. The secondary fuel mixing zone extends from the secondary fuel injection location to the catalytic unit to provide uni- form mixing of the fuel in the gas flow. During startup and lower loads, primary fuel is supplied to energize the turbine without secondary fuel. At a predetermined load, secondary fuel flow is initiated and primary fuel is cut back to a level sufficient to provide any preheat needed to raise the secondary fuel mixture to a level required for catalytic activity.

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