Modeling and simulation of soot combustion dynamics in a catalytic diesel particulate filter

Sarli, Valeria Di; Benedetto, Almerinda Di

doi:10.1016/j.ces.2015.06.011

Cited by 91 publications

(58 citation statements)

References 24 publications

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“…Preliminary results were also obtained in the absence of cake [16]. An abrupt transition from slow to fast regeneration was predicted to occur with increasing catalyst activity [14,15] and soot load [16]. This transition progressively shifts towards higher catalyst activity with increasing inlet gas velocity [15].…”

Section: Introductionmentioning

confidence: 94%

“…More recently, we proposed a two-dimensional CFD-based model of regeneration of a single-channel catalytic DPF [14], and performed simulations varying the catalyst activity, the inlet gas velocity, and the amount of soot loaded as cake [14][15][16]. Our attention was mainly focused on the interaction between combustion of the soot trapped inside the catalytic wall of the filter and combustion of the cake.…”

Section: Introductionmentioning

confidence: 99%

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

Sarli

Benedetto

2019

Applied Sciences

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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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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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

Sarli

Benedetto

2019

Applied Sciences

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“…The burning of the accumulated soot particles creates overheating spots in the filter which will damage the system [55]. A single channel model of the DPF filter was used in [56] for simulating the soot combustion in a DPF. The results of simulation showed that the combustion of soot causes a high temperature rise in the filter which would affect the durability of DPF.…”

Section: Commercial Fuel Based Active Regeneration Of Dpfmentioning

confidence: 99%

Review on Post-Treatment Emission Control Technique by Application of Diesel Oxidation Catalysis and Diesel Particulate Filtration

Kurien¹

2019

Journal of Thermal Engineering

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The toxic nature of exhaust gases released by these engines has led to environmental concerns, affecting its sustainability. The exhaust emission from diesel engine includes carbon monoxide, nitrates, hydrocarbons and particulate matter. Soot particles contained in the particulate matter is also found to be carcinogenic in nature and also leads to various lung diseases. Diesel oxidation catalysis system involves oxidation of hydrocarbons, nitrates and soluble organic fraction. Diesel particulate filtration blocks the soot particles with the help of alternately plugged diesel particulate filter with porous walls. The regeneration of accumulated soot is one of the major challenges faced by automotive industries for effective implementation of diesel particulate filtration system. A detailed review on the challenges faced in the implementation of emission control techniques has been carried out in this study and it has been explored from the results of literature study that microwave based regeneration technique would be an effective technique. This paper provides a platform for understanding the working principle of post treatment emission control techniques and also on the role of regeneration in effective operation of Diesel Particulate Filter.

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“…There are also a few works on two-dimensional (2D) models applying a commercial CFD software (see, for example, References [15][16][17]). It turns out that little improvement is gained by the 2D models when compared with the 1D models, while significant flow detail is lost relative to the 3D models.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Flow and Particle Deposition in Wall-Flow Filters with Intact or Damaged Exit

Tzorbatzoglou

Μαστρόκαλος

Haralampous

2019

Fluids

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We examine the time-dependent three-dimensional gas-particle flow in an intact wall-flow filter consisting of channels alternatively plugged at each end and a partially damaged filter in which the rear plugs are removed. Our focus is placed on highlighting the differences in the flow pattern and the deposition process between the two geometries. The Navier–Stokes equations are solved for the fluid flow coupled with a Brinkman/Forchheimmer model in order to simulate the flow in the porous walls and plugs. Discrete particle simulation is utilized to determine the nanoparticle trajectories. Using this scheme, we are able to characterize the main features of the flow fields developing in the intact and damaged filters with respect to the Reynolds number and identify those affecting the transport and deposition of particles that have three representative response times. We present fluid velocity iso-contours, which describe the flow regimes inside the channels, as well as in regions upstream and downstream of them. We provide evidence of local recirculating bubbles at the entrance of the channels and after their exit, whereas back-flow occurs in front of the rear plugs of the intact channels. We show that the flow leaves the channels as strong jets that may break up for certain flow parameters, leading to turbulence with features that depend on the presence of the rear plugs. The removal of the rear plugs affects the flow distribution, which, in turn influences the flow rates along the channels and through the walls. We describe the particle trajectories and the topology of deposited particles and show that particles follow closely the streamlines, which may cross the surface of permeable walls for both flow configurations. The distribution of deposited particles resembles the spatial variation of the through-wall flow rate, exhibiting two peak values at both ends of the intact filter channel, and one local maximum near the entrance of the damaged filter channel that is diminished at the exit. We also investigate in detail the particle deposition on the frontal face and indicate that particle accumulation at the edges of the entrance is favored for particles with low response times in flows with high fluid mass rates for both intact and damaged filters. Finally, we examine the filtration efficiency for the defective channels without rear plugs and show that fewer particles are captured as the Reynolds number is increased. A smaller reduction of the filtration efficiency is also predicted with increasing particle size.

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Modeling and simulation of soot combustion dynamics in a catalytic diesel particulate filter

Cited by 91 publications

References 24 publications

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

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

Review on Post-Treatment Emission Control Technique by Application of Diesel Oxidation Catalysis and Diesel Particulate Filtration

Numerical Study of Flow and Particle Deposition in Wall-Flow Filters with Intact or Damaged Exit

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