Review of the state-of-the-art of exhaust particulate filter technology in internal combustion engines

Biomorphic SiC is a biotemplated material fabricated by Si melt-infiltration of carbon preforms from wood pyrolysis. In this work, porous bioSiC ceramics from five different wood precursors, with porosities between 45 and 72% were studied for their feasibility in filtering applications. Gas permeability and mechanical stability were investigated as a function of the microstructure of the starting wood precursor. Air-permeation performance at room temperature was measured for a range of flow rates, and the permeability constants were assessed by fitting of Forchheimer's equation to the experimental data. Darcian permeabilities were achieved in the range 10 −11 -10 −12 m 2 , while inertial terms were in the range 10 −7 -10 −8 m, showing a correlation with the average pore size and orientation of the larger channels. Regarding the mechanical stability, maximum compressive strength values were reached in the range of 3-115 MPa. These results improve our understanding of the ways in which the microstructure influences permeability and mechanical robustness, enabling the device requirements to be tailored by selecting the wood precursor. It was also shown that these materials are promising for hot-gas filtering applications.

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“…(15) in conjunction with the Kozeny-Carman relationship of Eq. (12) to estimate an equivalent pore size. The validity of Eq.…”

Section: Permeability Predictionmentioning

confidence: 99%

“…One of the solutions is the use of diesel particulate filters (DPF) as physical barriers that remove particles from the exhaust gas of a diesel engine [12]. The most widely used filters to reduce the solid emissions is the well-known wall flow filter.…”

Section: Introductionmentioning

confidence: 99%

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

et al. 2016

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“…Soot particles are composed of a complex mixture of black carbon, metal ashes, hydrocarbons, water, and sulfur compounds. Due to their small size, they can penetrate deep into the human lung producing a cancer risk [26,27]. On the other hand, exhaust gases of diesel engines also contain a variety of harmful VOCs, from C5 to C11, or more [28].…”

Section: Introductionmentioning

confidence: 99%

Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot

et al. 2018

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Structured catalysts based on Pt,CeO 2 deposited on stainless steel wire meshes were developed to build catalytic cartridges for the treatment of diesel exhaust gases. The cartridges were tested for the simultaneous combustion of volatile organic compounds (VOCs) and soot. To this end, n-hexane, acetyl acetate, and toluene were selected as probe molecules. Each of them were loaded together with real soot into the cartridges showing that while VOCs abatement takes place between 200 • C and 350 • C, soot combustion occurs in the 300-500 • C temperature range with an average maximum combustion rate at 420 • C. The catalytic cartridges were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques. The mechanical stability of the coatings was confirmed by the ultrasound method. Air permeability of the cartridges prepared with different mesh sizes was also measured and the results were correlated using the Payri equation.

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“…The PM emission is accumulated and burned in the DPF, which is called DPF regeneration. The use of DPF is considered to be the only feasible Diesel after-treatment technology that can meet the increasingly stringent PM regulations (Guan, B. et al (2015)). …”

Section: Introductionmentioning

confidence: 99%

Composite Control of DOC-out Temperature for DPF regeneration

Ning

Yan

2016

IFAC-PapersOnLine

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Control of Diesel Oxidation Catalyst (DOC) outlet temperature is critical for the downstream Diesel Particulate Filter (DPF) regeneration. However, the disturbances, delay time variation and model uncertainties make it difficult to control DOC outlet temperature. A Composite Controller (CC) based on modified Active Disturbance Rejection Control (mADRC) with delay-time adaptation was proposed for DOC-out temperature control in this paper. The proposed controller includes a model-based Feedforward controller(FF) and a mADRC. The model based FF was designed based on the model between the reference temperature, inlet temperature, mass flow rate and the fuel injection. The mADRC was modified from regular Active Disturbance Rejection Contoller (rADRC) with an adaptation of input delay time. The input delay time is adapted according to the mass flow rate of exhaust gas. Simulation and test results through high-fidelity GT-Power model show that the proposed design can effectively control the DOC-out temperature.

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Review of the state-of-the-art of exhaust particulate filter technology in internal combustion engines

Cited by 356 publications

References 34 publications

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot

Composite Control of DOC-out Temperature for DPF regeneration

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