A New Theoretical Approach of Designing Cyclone Separator for Controlling Diesel Soot Particulate Emission 2006-01-1978

The reduction of particulate emissions from diesel engines is one of the most challenging problems associated with the exhaust air pollution control. Particulate emissions can be controlled by the adjustments of the combustion parameters of a diesel engine but these measures result in increased emissions of oxides of Nitrogen.Diesel particulate Filters (DPF) hold out the prospects of substantially reducing regulated particulate emissions but the question of the reliable regeneration of filters still remains a difficult hurdle. Many of the solutions proposed to date suffer from high engineering complexity, cost, thermal cracking, increased backpressure which in turn deteriorates diesel engine combustion performance. This paper presents an improved computer aided analytical approach for controlling Diesel soot particulate emission by Cyclone separator. Reduction of soot particles in the exhaust in turn reduces the Diesel Particulate Matter formation. Cyclone Separator with low initial cost, no thermal failure, simple construction produces low back pressure and reasonably high particulate collection efficiencies with reduced regeneration problems. Earlier studies of Cyclone as a two phase flow separator concentrates on finding of the particulate collection efficiencies as a whole of the Cyclone system without considering the cylindrical and conical components for overall grade efficiency. Almost no studies are available with analytical modeling of Cyclone separator as a Diesel soot particulate emission arrester In this work a new approach is proposed for calculating the overall grade efficiencies for Diesel particulate emission considering the outer vortex in the cylindrical part, outer vortex in conical part and inner vortex of Cyclone separator. Angle of turn by the exhaust gases for outer vortex in the cylindrical part, outer vortex in conical part, inner vortex and overall angle of turn in outer vortex are also proposed. Modified cut size diameter model is also presented in this study. The result shows good agreements with existing cyclone and DPF flow characteristics.