Browse Publications Technical Papers 2010-01-0561
2010-04-12

Fuel Vaporizer: Alternative Solution for DPF Regeneration 2010-01-0561

Current emission standards for diesel passenger cars in Europe and the US require the use of diesel particulate filters (DPF). For optimal engine performance the accumulated soot on the filter has to be removed periodically at elevated exhaust gas temperature of 600-650\,DC. Since many driving conditions do not allow such exhaust gas temperature additional measures have to be applied to increase the temperature in the exhaust.
Post-injection of diesel fuel in the combustion chamber is the more common solution used to increase the exhaust temperature for particulate filter regeneration. Oil dilution is one of the drawbacks of regeneration by post-injection.
The use of a fuel vaporizer is another option to increase the exhaust temperature by introducing fuel in vapor form into the exhaust system. The vaporizer can be located in front of the DOC/DPF either in a close coupled position to the engine or in an underfloor position. The vaporized hydrocarbons (HC) are burnt on the diesel oxidation catalyst (DOC). Energy is released by exothermal chemical reactions and the required regeneration temperature is obtained in front of the DPF.
This paper discusses the impact of different exhaust system designs and different fuel vaporizer locations on the performance of such technology. The performance is analyzed relative to uniform temperature distribution and HC-slip. The results of these measurements are used to discuss how a fuel vaporizer can be used to develop an optimized strategy for DPF regeneration in combination with post-injection.

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