Thermal regeneration of diesel‐particulate monolithic filters

Abstract

A mathematical model is developed to describe the process of thermal regeneration in diesel-particulate monolithic filters. The model shows that a typical regeneration cycle consists of four stages: preheating, ignition, transportcontrolled combustion, and cooling. The total regeneration time and the peak temperature are the important regeneration characteristics and can be controlled by initial particulate loading, total filtration area, and channel wall thickness.

Catalyzed diesel particulate filter modeling

“…This will begin by first illustrating some of the early preliminary efforts at modeling both fibrous-and monolithic-type devices. Next, the authors summarize the pioneering work by Bissett and Shadman (Bissett 1984, 1985, Bissett and Shadman 1985 to illustrate the foundation of the classic 1D model. Then, this article illustrates the extensions to the model according to the governing equations of flow, indicating primary and secondary phenomena along with how the equations are continually evolving into 1 + 1D, 2D, and 3D regimes.…”

“…When t d / d is close to zero, no variability needs to be taken into account (Bissett and Shadman 1985 ). In the range of t d / d < < 1, a " quasi 1D flow " can be assumed in a thin cake with the variable filtration area useful in modeling activities.…”

“…Koltsakis and Stamatelos (1996a,b) modify the Bissett and Shadman (1985) model by accounting for incomplete PM oxidation. In the energy equation formulation, this only influences the reaction enthalpy in Eqs.…”

Experimental investigation of catalytic soot oxidation and pressure drop characteristics in wall-flow diesel particulate filters

“…This is a fundamental assumption that is supported by the original work of Bissett and Shadmann [64] (see also the boundary conditions below). The solution yields the total consumption of oxygen ( ) ( )…”

“…• Hydrocarbon adsorption/ desorption -combustion characteristics • Fuel additive type and concentration in fuel and soot • Engine operation point (exhaust gas mass flow rate, soot emissions, fuel consumption) Although a fairly large variety of models are emerging during the last years in the literature, the pioneering work of Bisset and Shadmann [64] remains a valid, mathematically proper and well-documented approach for thermal regeneration modeling that deserves careful study by any newcomer in the field. This work has been adopted and extended in [65], allowing the reliable study and experimental validation of high space velocity thermal regeneration events, with a systematic methodology of filter loading assessment by energy balances.…”