Title
Experimental study into plasma-assisted PM removal for diesel engines
Author
Willems, F.P.T.
Creyghton, Y.
van Gulijk, C.
Oonk, H.
Maisuls, S.
TNO Wegtransportmiddelen
Publication year
2003
Abstract
Plasma-assisted PM removal is examined in a packed-bed plasma system. This study focuses on the effect of plasma power, space velocity and exhaust gas composition on PM filtration. Experiments are done on an engine dynamometer with a VW 1.2l TDI engine. During these experiments, the airflow is throttled so large smoke levels are realized. Then, absolute filtration effects can better be observed. For relatively small space velocities, 90% filtration efficiency based on smoke measurements is determined at an energy density of 25 J/l (i.e. plasma power per exhaust gas volume flow). In the studied operating point, the filtration efficiency is not further increased for larger energy densities. Based on these results, we conclude that the available plasma power has to be increased for full flow experiments. In cases without airflow throttling, the plasma has no effect on PM filtration. Application of a 10 kV bias to enhance electrostatic precipitation is also seen to be ineffective. Future research into the effects of plasma on particle charge distribution has to give more insight in the observed processes at these relatively small particulate concentrations. NO2 production is also examined, since this gives an indication of maximal theoretical PM oxidation. For the case with maximal NO2 production, we found a NO2 energy efficiency of 0.12 kWh/g without adding hydrocarbons. Comparison with other experimental systems using hydrocarbon injection learns that the studied system is relatively efficient. The determined NO2 production corresponds with maximal 0.89 kWh/g PM oxidation. Copyright © 2003 Society of Automotive Engineers of Japan, Inc.
Subject
Electrostatic precipitation
Energy density
Exhaust Gas Composition
Experimental studies
Experimental system
Filtration efficiency
Flow experiments
Gas volume
Operating points
Particle charge distribution
Plasma power
Plasma systems
PM removal
Smoke levels
Smoke measurement
Space velocities
Diesel engines
Electrostatic separators
Enzyme immobilization
Experiments
Hydrocarbons
Nitrogen oxides
Plasmas
Energy efficiency
Plasma-assisted PM removal
To reference this document use:
http://resolver.tudelft.nl/uuid:09451a9c-016c-4313-b59d-9693c033298f
TNO identifier
362670
Source
JSAE Conference 2003
Article number
SAE technical paper 2003-01-1878
Document type
conference paper