Development of a Diesel Particulate Filter Composition and Its Effect on Thermal Durability and Filtration Performance

Murtagh, Martin J.; Sherwood, Diana L.; Socha, Louis S.

doi:10.4271/940235

Cited by 40 publications

(22 citation statements)

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“…Penetration of soot mass inside the porous wall is only partial in wall-flow monoliths. It has been concluded from experimental works performed at the early developments of wall-flow DPF by Murtagh et al [35] and in recent works conducted to analyse the influence of filtration velocity on soot loading characteristics [36] and to propose new analysis techniques of loaded DPFs [37]. Lattice Boltzmann computation has also reported similar results in different studies focused on soot accumulation and pore structure [38], soot deposition and combustion [39] or development of fuel efficient DPFs [40].…”

Section: Methodology and Calculation Hypothesismentioning

confidence: 75%

“…Experimental and geometric data have been obtained from [35] for DPFs #A to #D and from [41] in the case of DPF #E. Micro-scale properties shown in Table 1 of the porous wall in DPFs #F and #G have been obtained applying the experimental-theoretical methodology described by Payri et al in [24]. The porous wall permeability has been computed for every DPF according to Eq.…”

Section: Resultsmentioning

confidence: 99%

“…6. Figure 1 shows the comparison between experimental and modelled pressure drop as function of the collected soot mass for DPFs #A to #D. Experiments in Figure 1 were performed with 0.285 kg/s in mass flow at 260 o C. More details of these soot loading tests can be found in [35]. Figure 2 represents the prediction of the model for DPF #E considering different mass flows.…”

Section: Resultsmentioning

confidence: 99%

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Packed bed of spherical particles approach for pressure drop prediction in wall-flow DPFs (diesel particulate filters) under soot loading conditions

Serrano

Arnau

García-Afonso

2013

Energy

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ElsevierSerrano Cruz, JR.; Arnau Martínez, FJ.; Piqueras Cabrera, P.; Garcia Afonso, O. (2013) AbstractThe soot loading process in wall-flow DPFs affects the substrate structure depending on the filtration regime and produces the increase of pressure drop. Deep bed filtration regime produces the decrease of the porous wall permeability because of the soot particulates deposition inside it. Additionally, a layer of soot particulates grows on the porous wall surface when it becomes saturated. As soot loading increases, the pressure drop across the DPF depends on the porous wall and particulate layer permeabilities, which are in turn function of the substrate and soot properties. The need to consider the DPF pressure drop influence on engine performance analysis or DPF regeneration processes requires the use of low-computational effort models describing the structure of the soot deposition and its effect on permeability.This paper presents a model to describe the micro-scale of the porous wall and the particulate layer structure assuming them as packed beds of spherical particles. To assess the model's capability, it is applied to predict the DPF pressure drop under different experimental conditions in soot loading, mass flow and gas temperature.

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Section: Methodology and Calculation Hypothesismentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Packed bed of spherical particles approach for pressure drop prediction in wall-flow DPFs (diesel particulate filters) under soot loading conditions

Serrano

Arnau

García-Afonso

2013

Energy

View full text Add to dashboard Cite

show abstract

“…This phenomenon has been shown by different authors covering experimental approaches, such as the works on filtration performance performed by Murtagh et al [31], the development of new techniques for loading characterisation carried out by Fino et al [32], the investigations of Yapaulo et al [33] on the impact of the filtration velocity or the visual analysis of particle matter depositions presented by Liati et al [34]. Theoretical and modelling works have also corroborated this conclusion considering meso-scale porous wall description [28] and micro-scale modelling of the flow and particles path in the porous wall [35] by using Lattice-Boltzmann techniques [36].…”

Section: Dpf Filtration Efficiencymentioning

confidence: 93%

Pre-DPF water injection technique for pressure drop control in loaded wall-flow diesel particulate filters

et al. 2015

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ElsevierBermúdez Tamarit, VR.; Serrano Cruz, JR.; Piqueras Cabrera, P.; Garcia Afonso, O. (2015 AbstractWall-flow type diesel particulate filter (DPF) is a required aftertreatment system for particle emission abatement and standards fulfilment in Diesel engines. However, the DPF use involves an important flow restriction, especially as the substrate gets soot and ash loaded. It gives as a result the increase of the exhaust back-pressure and hence a fuel consumption penalty. The increasing damage of fuel consumption with DPF soot loading leads to the need of the regeneration process. Usually based on active strategies, this process involves an additional fuel penalty but prevents from excessive DPF pressure drop and ensures secure soot burnt out.Under this context, new solutions are required to improve the state of the art DPF soot loading to pressure drop ratio. This paper presents a novel technique based on pre-DPF water injection to reduce the DPF pressure drop under soot loading conditions by disrupting its dependence on soot/ash loading. It provides benefits to engine fuel economy and also higher flexibility for DPF regeneration and maintenance. The work covers a test campaign performed in a passenger car turbocharged Diesel engine equipped with a wall-flow DPF. The main objective is to describe the technique, to provide a figure of its potential for pressure drop control and fuel consumption reduction. The results of the experiments also confirm soot and ash loading capacity increase and demonstrate the lack of negative effects on filtration efficiency and active and passive regeneration.

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“…In particular, the permeability of the porous wall is calculated considering that the soot penetration is only partial [24,25], so that Equation (7) is applied to a soot-loaded porous wall thickness and to the complementary one, which is considered to be kept fully clean:…”

Section: Wall-flow Dpf Modelmentioning

confidence: 99%

On the Impact of Particulate Matter Distribution on Pressure Drop of Wall-Flow Particulate Filters

et al. 2017

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Wall-flow particulate filters are a required exhaust aftertreatment system to abate particulate matter emissions and meet current and incoming regulations applying worldwide to new generations of diesel and gasoline internal combustion engines. Despite the high filtration efficiency covering the whole range of emitted particle sizes, the porous substrate constitutes a flow restriction especially relevant as particulate matter, both soot and ash, is collected. The dependence of the resulting pressure drop, and hence the fuel consumption penalty, on the particulate matter distribution along the inlet channels is discussed in this paper taking as reference experimental data obtained in water injection tests before the particulate filter. This technique is demonstrated to reduce the particulate filter pressure drop without negative effects on filtration performance. In order to justify these experimental data, the characteristics of the particulate layer are diagnosed applying modeling techniques. Different soot mass distributions along the inlet channels are analyzed combined with porosity change to assess the new properties after water injection. Their influence on the subsequent soot loading process and regeneration is assessed. The results evidence the main mechanisms of the water injection at the filter inlet to reduce pressure drop and boost the interest for control strategies able to force the re-entrainment of most of the particulate matter towards the inlet channels' end.

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Development of a Diesel Particulate Filter Composition and Its Effect on Thermal Durability and Filtration Performance

Cited by 40 publications

References 1 publication

Packed bed of spherical particles approach for pressure drop prediction in wall-flow DPFs (diesel particulate filters) under soot loading conditions

Packed bed of spherical particles approach for pressure drop prediction in wall-flow DPFs (diesel particulate filters) under soot loading conditions

Pre-DPF water injection technique for pressure drop control in loaded wall-flow diesel particulate filters

On the Impact of Particulate Matter Distribution on Pressure Drop of Wall-Flow Particulate Filters

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