Intermittent application of syngas to nox trap and/or diesel...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/00 (2006.01) F01N 3/10 (2006.01)

Patent

CA 2543410

A catalytic partial oxidizer (30) provides syngas (hydrogen and carbon monoxide) to an apparatus intermittently using syngas such as valves (34) feeding NOx traps (35), for brief periods of time. During turndown times when syngas is not being used, either the output of the CPO is diverted (33) to the inlet (13) of an engine (12) through the engine gas recycle (EGR) system (43- 46), or the amount of fuel (19) and exhaust (23) applied to the CPO is reduced (24, 26; 59, 60) so that the CPO merely stays warm and in a reduced state, thereby being ready to restart immediately. A mini-CPO (62) may provide syngas and heat to the major CPO (30) during the turndown time when syngas is not being used by the NOx traps.

L'invention concerne un agent oxydant (30) catalytique partiel fournissant un gaz de synthèse (hydrogène et monoxyde de carbone) de manière intermittente à un appareil, tel que des soupapes (34) alimentant des pièges à NOx (35) pendant de courtes périodes. Pendant des périodes de débit moyen lorsqu'on n'utilise pas de gaz de synthèse, soit la sortie de l'agent oxydant catalytique partiel (CPO) est déviée (33) vers l'entrée (13) d'un moteur (12) à travers le système (43-46) de recirculation des gaz de moteur (EGR), soit la quantité de carburant (19) et d'échappement (23) appliquée au CPO est réduite (24, 26; 59, 60) de sorte que celui-ci reste tout simplement chaud et à l'état réduit, et de ce fait est prêt à redémarrer immédiatement. Un mini-CPO (62) peut fournir un gaz de synthèse et chauffer le CPO principal (30) pendant le débit moyen lorsque le gaz de synthèse n'est pas utilisé par les pièges à NOx.

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