Catalytic combustion

Details Catalytic combustion Catalytic combustion

F - Mech Eng,Light,Heat,Weapons

23

R

F23R 3/40 (2006.01) F23C 13/00 (2006.01)

Patent

CA 2137579

Combustion apparatus, e.g. for a gas turbine, has at least one catalytic combustion unit (14, 15, 16) having a plurality of through passages of which some are combustion passages (28) having a combustion catalyst on the passage walls and at least some others are bypass preheat passages (29) that are free of catalyst and are adjacent the combustion passages. A first gas stream containing air and fuel is supplied to the combustion and bypass preheat passages; catalytic combustion of the fuel occurs in the combustion passages (28) and heat is transferred through the passage walls to heat the gas in the bypass preheat passages (29). On emergence from the combustion unit (14, 15, 16) the preheated gas from the bypass passages (29) combusts in a down- stream afterburn zone (20). A second gas stream containing air and a variable amount of fuel is supplied to the afterburn zone (20). Where there is more than one combustion unit, larger bypass passages (26) may be provided through the first combustion unit (14) so that part of the first gas stream passses through the first combustion unit (14) without preheating and mixes, in a zone (17) between the first and second combustion units (14, 15), with the gas from the combustion passages (28) and bypass preheat passages (29) of combustion unit (14) to form the gas stream fed to the second combustion unit (15).

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