Plasma Suppression of Diesel Soot Deposition During Diesel Engine Operations
J. S. Chang1, C. Luthereau1, 2, E. dela Cruz1, P. I. Khalaf1, 3, D. Brocilo1, G. D. Harvel1, 4, D. Ewing1, N. A. Debacher3, F. McCluskey2, J. S. Cotton1, 5, and M. Bardeleben5
1 McIARS, McMaster University, Canada
2 IOT, Universite Joseph Fourier, France
3 Federal University of Santa Catalina, Brazil
4 University of Ontario Institute of Technology, Canada
5 Dana Corp, Long Mfg Inc., Canada
Abstract
This About 40 % of the air pollution is generated by vehicles and transports. The particulate matter (PM) emission significantly impacts human health. Fine particles below 2.5 µm (PM2.5) can enter the lungs and lead to respiratory problems. These particles not only influence human health, but also reduce the capability of many au-tomobile exhaust heat exchanging devices, such as exhaust gas recirculation (EGR) cooling systems and corro-sion problems in exhaust systems of a diesel engine, since the soot deposit layer acts as thermal isolation and adsorbs corrosive gases. This study examines using non-thermal plasma systems to prevent significant formation and deposition of soot. An experiment was conducted to suppress soot deposition to the pipe wall by non-thermal plasma generated radicals, metastables and ions. The results show that the chemical oxidation and reduction that occur during the plasma process may suppress soot deposition on the pipe wall since some soot oxidation and ash reduction gaseous by-products were observed. Non-thermal plasma also contributed a removal of NOx and CO from the diesel exhaust. The physical suppression of soot deposition is also observed, since soot layer thickness in the pipe wall is relatively uniform which may be due to the re-entrainment of the deposited soot and effect of electrohydrodynamic flow.
Keywords - Diesel Soot Removal, Non-thermal Plasma, Flow Stabilized Corona, Electrohydrodynamics, Neutron Radiography Imaging
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