Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-03-23
1997-02-18
Heyman, Leonard
Power plants
Internal combustion engine with treatment or handling of...
Methods
60284, 60297, 60298, 60300, 60307, 60311, F01N 310
Patent
active
056032153
ABSTRACT:
In a system for treating an exhaust stream, such as the exhaust of an internal combustion engine (10), the exhaust is initially treated by a first catalytic converter (14) and its effluent is cooled in an indirect heat exchanger (18) with an extraneous coolant fluid, i.e., one other than recycled engine exhaust, before introducing the exhaust into a hydrocarbon trap (30) to adsorb hydrocarbons therefrom at least during a cold-start period of engine operation. Such cooling enables utilization of highly efficient adsorbent materials such as activated carbon which otherwise could not be used. Adsorbed hydrocarbons are desorbed from the hydrocarbon trap (30) as the engine exhaust heats up. The exhaust is passed from hydrocarbon trap (30) to a second catalytic converter (34) for oxidation of the hydrocarbons. The coolant fluid may be air and the heated air obtained from the heat exchanger (18) may be introduced into the oxidation catalytic converter (34) to heat the latter at least during cold-start operation and to supply additional oxygen.
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Burk Patrick L.
Sung Shiang
Engelhard Corporation
Heyman Leonard
Negin Richard A.
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