Reactors for investigation of soot combustion on filter surfaces

Herz, Richard K.; Sinkevitch, Robert M.

doi:10.1016/0008-6223(86)90268-x

Cited by 18 publications

(10 citation statements)

References 5 publications

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“…Following this shift the maximum DPF temperature is a monotonic increasing function of the filtration velocity. Eventually this trend is reversed 46, 47. All the experiments reported here were conducted under conditions that an increase in either the feed temperature, the oxygen concentration, or the filtration velocity increased the DPF temperature under stationary operation.…”

Section: Introductionmentioning

confidence: 95%

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Chen¹,

Martirosyan²,

Luss³

2010

AIChE Journal

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A major technological challenge in the regeneration of diesel particulate filters (DPFs) is that sometimes local high temperature excursions melt the cordierite ceramic filter. The cause of this melting is still an open question as the highest temperature attained under stationary (constant feed) combustion of the accumulated particulate matter is too low to cause this melting (melting temperature $1250 C). We recently conjectured that the high temperature excursions are a counterintuitive response to a rapid deceleration, which decreases the exhaust gas temperature and flow rate and increases the oxygen concentration. Infrared measurements of the spatiotemporal temperature during soot combustion on a single-layer DPF showed that a simultaneous step change of the feed temperature, flow rate, and oxygen concentration can lead to a transient temperature that exceeds the highest attained for stationary operation under either the initial or the final operation conditions. The experiments revealed that the magnitude of the temperature rise depends in a complex way on several factors, such as the direction of movement of the propagating temperature front. The amplitude of the temperature rise is a monotonic decreasing function of the distance that the temperature front moved before the step change. The rapid response to the feed oxygen concentration increases initially the moving front temperature. The slow response of the ceramic DPF to a decrease in the feed temperature may eventually decrease the moving front temperature and even lead to premature extinction and partial regeneration.

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Section: Introductionmentioning

confidence: 95%

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Chen¹,

Martirosyan²,

Luss³

2010

AIChE Journal

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“…The first peak is related to oxidation of hydrocarbons adsorbed onto the soot surface and the second peak to oxidation of the solid fraction. Herz and Sinkevitch reported that the ignition and combustion characteristics of the soot deposits were strongly affected by the amount of adsorbed hydrocarbons [10].…”

Section: Introductionmentioning

confidence: 99%

The role of fuel-borne catalyst in diesel particulate oxidation behavior

Song

Wang

Boehman

2006

Combustion and Flame

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“…Extensive experiments2–10 and theoretical simulations11–26 attempted to determine what generates these large temperature excursions. Most studies determined the dependence of the temperature rise on various operating conditions such as feed composition, temperature and flow rate, and PM‐deposit layer thickness under stationary feed conditions.…”

Section: Introductionmentioning

confidence: 99%

Hot zones formation during regeneration of diesel particulate filters

2011

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A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the diesel engine exhaust. The accumulated PM is periodically removed by combustion, which sometimes leads to excessive temperature excursions that melt the ceramic filter. This behavior cannot be explained by operation under stationary feed conditions. We propose that these temperature excursions are a dynamic effect following a rapid change in the driving mode while the DPF is being regenerated. Specifically, a rapid decrease in the exhaust temperature can lead to a counterintuitive large transient temperature rise above that which would exist under a higher stationary feed temperature. This unexpected behavior is similar to the well-known wrong-way behavior in packedbed reactors, even though the axial-dependent flow through the filter in a DPF is rather different from the constant axial flow through a packed bed. We present simulations that provide insight about the dependence of the amplitude of this wrong-way temperature rise on the filtration velocity, the PM loading, dimensions of the DPF, and the amplitude of the rapid temperature decrease and when it occurs after the start of the regeneration. The insight provided by these simulations will help develop operation and control protocols that circumvent or at least decrease the probability of the occurrence of the destructive melting of the DPF. V

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Reactors for investigation of soot combustion on filter surfaces

Cited by 18 publications

References 5 publications

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

The role of fuel-borne catalyst in diesel particulate oxidation behavior

Hot zones formation during regeneration of diesel particulate filters

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