Soot Combustion Dynamics in a Planar Diesel Particulate Filter

2009 ◽  
Vol 48 (7) ◽  
pp. 3323-3330 ◽  
Author(s):  
K. Chen ◽  
K. S. Martirosyan ◽  
D. Luss
Keyword(s):  
Diesel Particulate Filter ◽  
Particulate Filter ◽  
Soot Combustion ◽  
Combustion Dynamics ◽  
Diesel Particulate

Boundary Conditions for Combustion Field and LB Simulation of Diesel Particulate Filter

2013 ◽  
Vol 13 (3) ◽  
pp. 769-779 ◽  
Author(s):  
Kazuhiro Yamamoto
Keyword(s):  
Lattice Boltzmann ◽  
Diesel Particulate Filter ◽  
Complex Geometry ◽  
Numerical Procedure ◽  
Soot Oxidation ◽  
Particulate Filter ◽  
Soot Combustion ◽  
Diesel Particulate ◽  
Soot Deposition ◽  
Lattice Boltzmann Simulation

AbstractA diesel particulate filter (DPF) is a key technology to meet future emission standards of particulate matters (PM), mainly soot. It is generally consists of a wall-flow type filter positioned in the exhaust stream of a diesel vehicle. It is difficult to simulate the thermal flow in DPF, because we need to consider the soot deposition and combustion in the complex geometry of filter wall. In our previous study, we proposed an approach for the conjugate simulation of gas-solid flow. That is, the gas phase was simulated by the lattice Boltzmann method (LBM), coupled with the equation of heat conduction inside the solid filter substrate. However, its numerical procedure was slightly complex. In this study, to reduce numerical costs, we have tested a new boundary condition with chemical equilibrium in soot combustion at the surface of filter substrate. Based on the soot oxidation rate with catalysts evaluated in experiments, the lattice Boltzmann simulation of soot combustion in the catalyzed DPF is firstly presented to consider the process in the after-treatment of diesel exhaust gas. The heat and mass transfer is shown to discuss the effect of catalysts.

scholarly journals Using CFD Simulation as a Tool to Identify Optimal Operating Conditions for Regeneration of a Catalytic Diesel Particulate Filter

2019 ◽  
Vol 9 (17) ◽  
pp. 3453 ◽  
Author(s):  
Valeria Di Sarli ◽  
Almerinda Di Benedetto
Keyword(s):  
Diesel Particulate Filter ◽  
Cfd Simulation ◽  
Catalyst Activity ◽  
High Sensitivity ◽  
Operating Conditions ◽  
Particulate Filter ◽  
Optimal Operating ◽  
Combustion Dynamics ◽  
Diesel Particulate ◽  
Time Required

In the work presented in this paper, CFD-based simulations of the regeneration process of a catalytic diesel particulate filter were performed with the aim of identifying optimal operating conditions in terms of trade-off between time for regeneration and peak temperature. In the model, all the soot trapped inside the filter was assumed to be in contact with the catalyst. Numerical results have revealed that optimization can be achieved at low inlet gas velocity by taking advantage of the high sensitivity of the soot combustion dynamics to the availability of oxygen. In particular, optimal conditions have been identified when operating with highly active catalysts at sufficiently low inlet gas temperatures, so as to lie on the boundary between kinetics-limited regeneration and oxygen transport-limited regeneration. As catalyst activity is increased, this boundary progressively shifts towards lower inlet gas temperatures, resulting in lower peak temperatures and shorter times for filter regeneration. Under such conditions, in order to further speed up the process while still ensuring temperature control, it is essential to keep the filter adequately hot, thus minimizing the time required for the preheating phase, which may be a significant part (up to 65%) of the total time required for regeneration (preheating plus soot consumption).

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