Experimental Investigations and Dynamic Simulation of Diesel Particulate Filter Systems

Peck, Rainer Stefan; Becker, Carsten

doi:10.1002/ceat.200900192

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…In various cases a DPF is connected by a wide-angled cone to the engine exhaust pipe. Examples are the recently developed catalytic DPFs − that simultaneously remove the PM and oxidize the effluent organic compounds, and the new DPFs − that reduce both the PM and NOx emissions. A potentially dangerous temperature excursion occurs following a rapid deceleration of the diesel engine or a sudden shift to idle.…”

Section: Discussionmentioning

confidence: 99%

“…Circumventing these occasional local temperature excursions is still a major technological challenge in the design, operation, and control of a DPF. Numerous experimental and theoretical studies have attempted to understand and predict the undesirable formation of the high temperature excursions in a DPF. − …”

Section: Introductionmentioning

confidence: 99%

“…Recently, catalytic DPFs have been developed, which simultaneously remove the PM and oxidize any emitted organic compounds. − Also, new DPF systems for simultaneous NOx and PM reduction are under intense development. − In these cases the exhaust pipe is connected to the larger diameter DPF by a wide-angled cone (diffuser). Stratakis and Stamatelos , experiments revealed that the cone caused mal-distribution of the inlet velocity to the various channels.…”

Section: Introductionmentioning

confidence: 99%

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Inlet Cone Effect on Diesel Particulate Filter Regeneration upon a Rapid Shift to Idle

Luss

2012

Ind. Eng. Chem. Res.

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The particulate matter (PM) emitted by a diesel engine is collected and then burned in a diesel particulate filter (DPF). A major technological challenge in the operation of the ceramic, often cordierite, filter is that a rapid shift to idle may create a local hot region with a temperature much higher than under stationary feed conditions. This excessive transient temperature rise may cause local melting or cracking of the ceramic filter. Almost all previous studies of temperature excursions during the DPF regeneration (combustion of the deposited PM) were of cases in which equal exhaust flow rate was fed to all the parallel inlet channels. The diesel engine exhaust pipe is sometimes connected to the DPF by a wide-angled cone (diffuser). This leads to a mal-distribution of the flow rate to the inlet channels and of the deposited PM. Simulations revealed that following a rapid shift to idle the highest regeneration temperature in a DPF fed by a cone exceeded that in one not fed by a cone and it may exceed the cordierite DPF melting temperature (1200 °C). Moreover, it may generate transient radial and axial temperature gradients several times higher than under stationary regeneration that may crack the cordierite DPF. The increase in the temperature gradient is especially large in the axial direction. One of the surprising findings is that the highest temperature attained following a step change to idle is not a monotonic function of the initial PM loading.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inlet Cone Effect on Diesel Particulate Filter Regeneration upon a Rapid Shift to Idle

Luss

2012

Ind. Eng. Chem. Res.

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“…Diesel particulate filter (DPF) is an effective tool to control soot from diesel engine. Generally, the exhaust temperature ranges from 150 • C to 450 • C, while the oxidation temperature of soot exceeds 550 • C. It is, therefore, necessary to raise the temperature for soot combustion, but excessive soot combustion temperature will damage the filter material [5]. Therefore, a superior solution is to reduce the oxidation reaction temperature of soot using catalysts.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation on the Catalytic Activity of a Novel CeZrK/rGO Nanocomposite for Soot Oxidation in Catalyzed Diesel Particulate Filter

Tang

et al. 2021

Processes

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A nanostructured solid solution catalyst CeZrK/rGO for soot oxidation in catalyzed diesel particulate filter was synthesized using the dipping method. The reduced graphene oxide (rGO) was used as the catalyst carrier, and CeO2, ZrO2, and K2O were mixed with the molar ratio of 5:1:1, 5:2:2 and 5:3:3, which were referred to as Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO, respectively. The structure, morphology and catalytic activity of the CeZrK/rGO nanocomposites were thoroughly investigated and the results show that the CeZrK/rGO nanocomposites have nanoscale pore structure (36.1–36.9 nm), high-dispersion quality, large specific surface area (117.2–152.4 m2/g), small crystallite size (6.7–8.3 nm), abundant oxygen vacancies and superior redox capacity. The 50% soot conversion temperatures of Ce5Zr1K1/rGO, Ce5Zr2K2/rGO, and Ce5Zr3K3/rGO under tight contact condition were decreased to 352 °C, 339 °C and 358 °C respectively. The high catalytic activity of CeZrK/rGO nanocomposites can be ascribed to the following factors: the doping of Zr and K ions causes the nanocrystalline phase formation in CeZrK solid solutions, reduces the crystallite size, generates abundant oxygen vacancies and improves redox capacity; the rGO as a carrier provides a large specific surface area, thereby improving the contact between soot and catalyst.

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“…Recently, a catalytic DPF has been developed, which simultaneously removes the PM and oxidizes the emitted uncombusted organic compounds. − In these cases the exhaust pipe is connected to the larger diameter DPF by a wide-angled cone (diffuser). The experiments of Stratakis and Stamatelos , revealed that the cone caused mal-distribution of the inlet velocity to the various channels.…”

Section: Introductionmentioning

confidence: 99%

Inlet Cone Effect on Particulate Matter Deposition and Regeneration Temperature in a Diesel Particulate Filter

Luss

2012

Ind. Eng. Chem. Res.

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A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the effluent of a diesel engine. A major technological challenge in the operation of the ceramic cordierite filter is to prevent formation of local high temperatures that can melt the DPF or generate a thermal stress that may cause cracking. Most previous studies of the temperature rise during the DPF periodic regeneration (combustion of the deposited PM) considered cases in which the inlet velocity to all the parallel channels was uniform. A wide-angled cone (diffuser) is sometimes used to connect the diesel engine exhaust pipe to the DPF leading to a nonuniform velocity to the inlet channels, with the highest attained at the DPF center. We used a PM deposition and regeneration computational model to investigate the impact of the inlet cone on the DPF behavior under stationary feed conditions. The cone led to mal-distribution of the deposited PM, with the highest thickness in the DPF center. The highest regeneration temperature when using an inlet cone may be quite higher than when it is absent. Moreover, the inlet cone can generate higher temperature gradients and the resulting thermal stresses may crack the ceramic support. The largest radial thermal gradients are encountered close to the wall in the downstream section of DPF, shortly after the temperature inside the filter reaches its peak. The cone leads to a slightly faster regeneration than when it is not used.

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Experimental Investigations and Dynamic Simulation of Diesel Particulate Filter Systems

Cited by 16 publications

References 8 publications

Inlet Cone Effect on Diesel Particulate Filter Regeneration upon a Rapid Shift to Idle

Inlet Cone Effect on Diesel Particulate Filter Regeneration upon a Rapid Shift to Idle

Experimental Evaluation on the Catalytic Activity of a Novel CeZrK/rGO Nanocomposite for Soot Oxidation in Catalyzed Diesel Particulate Filter

Inlet Cone Effect on Particulate Matter Deposition and Regeneration Temperature in a Diesel Particulate Filter

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