F - Mech Eng,Light,Heat,Weapons – 23 – R
Patent
F - Mech Eng,Light,Heat,Weapons
23
R
F23R 3/40 (2006.01)
Patent
CA 2561255
The invention is characterized in that: a catalytic converter arrangement (1) is provided upstream from the flame (13) and can be flowed through by a air/pilot fuel mixture (4) that is separate from the air/fuel mixture; the catalytic converter arrangement (1) comprises at least two catalytic converter stages, which are arranged one behind the other in the direction of flow and of which the catalytic converter stage (3) situated upstream, the so-called POX catalytic converter, can be flowed through by the air/pilot fuel mixture (4) with an air/pilot fuel mixture ratio of .lambda. < 1 whereby partially oxidizing the air/pilot fuel mixture (4), and the catalytic converter stage (8) situated downstream, the so-called FOX catalytic converter, can be flowed through by a leaned air/pilot fuel mixture (7) with a mixture ratio of .lambda. > 1 whereby completely oxidizing the leaned air/pilot fuel mixture while forming an inert flow of hot gas (9).
L'invention est caractérisée en ce qu'un ensemble catalyseur (1), à travers lequel peut s'écouler un mélange air/combustible pilote (4) séparé du mélange air/combustible est placé en amont de la flamme (13) et en ce que l'ensemble catalyseur (1) présente au moins deux étages de catalyseur placés l'un derrière l'autre dans le sens d'écoulement. L'étage de catalyseur (3) placé en amont, appelé catalyseur POX, peut être traversé par le mélange air/combustible pilote (4) dans un rapport de mélange air/combustible pilote (lambda) < 1 et assure l'oxydation partielle du mélange air/combustible pilote (4). L'étage de catalyseur (8) placé en aval, appelé catalyseur FOX, peut être traversé par un mélange air/combustible pilote (7) appauvri dans un rapport de mélange air/combustible pilote (lambda) > 1 et assure l'oxydation totale du mélange air/combustible pilote appauvri, avec formation d'un flux de gaz chaud inerte (9).
Carroni Richard
Meeuwissen Thiemo
Alstom Technology Ltd.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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