Modeling of Catalytic Conversion of CO/HC in Gasoline Exhaust at Engine Cold-Start Nanyang Technological University

Format:

Conference/Event

Author/Creator:

Chan, S. H., author.

Conference Name:

International Congress & Exposition (1999-03-01 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

Heat transfer study is particularly important in a modern engine exhaust system incorporated with a catalytic converter. Heat loss along the exhaust system, which includes exhaust ports, manifold, tailpipe and catalytic converter, causes prolonged lightoff time of catalysts at engine cold-start. This implicitly means that more noxious gas emissions in the cold-start phase will be produced at the engine tailpipe, which contributes to an overall increase in exhaust toxic emissions, in particular for urban driving where heavy traffic is frequently encountered. Modeling of exhaust heat transfer is thus necessary, as it is a powerful and cost effective tool for estimating the lightoff time and conversion efficiency of the catalysts. Furthermore, the concentrations of noxious gases in the exhaust tailpipe can be calculated.This paper considers the chemical conversion of carbon monoxide and unburned hydrocarbons in the oxidation process with detailed heat transfer modeling, which includes conductive, convective and radiative heat transfers. The effects of water vapor condensation and water evaporation on temporal distribution of exhaust gas temperature in the exhaust system are also considered with simplified heat transfer model

Notes:

Vendor supplied data

Publisher Number:

1999-01-0452

Access Restriction:

Restricted for use by site license