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Reduction of Heavy-Duty Diesel Exhaust Particle Number and Mass at Low Exhaust Temperature Driving by the DOC and the SCR

SAE International Journal of Fuels and Lubricants

Proventia Emission Control Oy-Arno Amberla
Finnish Meteorological Institute-Sanna Saarikoski, Minna Aurela, Risto Hillamo
  • Journal Article
  • 2012-01-1664
Published 2012-09-10 by SAE International in United States
The effect of SCR on nanoparticle emissions has been a subject for some recent diesel particle emission related studies. In this study, the effect of after-treatment (DOC and SCR) on particle emissions was studied with a heavy-duty off-road diesel engine (emission level stage 3b with an SCR). A special “transient cold test cycle” (TCTC) was designed to describe the SCR system operation at low exhaust gas temperatures. The particle instrumentation made it possible to measure on-line the particle number concentration, particle size distribution and chemical composition of particles. The largest particle number concentrations were measured after the exhaust manifold. The exhaust after-treatment was observed to reduce the total particle number concentration by 82.5% with the DOC and 95.7% with the DOC+SCR. Also the mean particle composition was affected by the after-treatment; while the organics formed the main fraction of the particulate mass without exhaust after-treatment, after the DOC and especially after the DOC+SCR the organic particulate matter was reduced so that most significant particle fraction was soot. The effect of after-treatment was similar both on…
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