Modeling the regeneration of fibrous participate filter

Abstract

Diesel paniculate filters (traps) are effective devices in controlling diesel engine paniculate emissions. Mathematical modelling can be a useful design tool in assessing the performance of paniculate filters. A generalized model describing oxidation, heat and mass transfer in a porous filter substrate is developed and applied to the thermal regeneration of diesel paniculate traps. In this paper, a set of dimensionless model equations are used to decrease the number of parameters and for better analysis of the regeneration process. A FORTRAN program is coded using an EMSL subroutine to solve these partial differential equations. A parametric study of the regeneration process is carried out in order to predict safe and effective regeneration conditions. Simulation results demonstrate the effects of exhaust oxygen concentration and initial trap paniculate loading on the regeneration time, the mass of paniculate in the trap, and the temperature of the gas and solid (particulate) interface.