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Modelling Investigation of the Thermal Treatment of Ash-Contaminated Particulate Filters

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Lao, Chung Ting 
Akroyd, Jethro 
Smith, Alastair 
Morgan, Neal 
Lee, Kok Foong 


Abstract: This paper investigates the impact of thermal treatment on the pressure drop of particulate filters containing ash deposits. A one-dimensional model has been developed and applied to describe the deposition of soot and ash particles, and estimate the spatial distribution of the deposits in such filters. Phenomenological models have been developed to describe the potential sintering and cracking of the ash deposits caused by thermal treatment of the filter. The model results are in good agreement with experimental measurements of the reduction in the pressure drop in thermally treated filters. It was found that crack formation in the ash layer can lead to significant reduction of the pressure drop at relatively low temperatures. Sintering of ash deposits in the wall and the ash plug also contributes towards a decrease in filter pressure drop at higher temperatures. This work is the first attempt to model the impact of the thermal treatment of ash in particulate filters in order to support the development of future ash management strategies. The cracking of the ash layer during the thermal treatment has been identified to be the most critical effect for pressure drop reduction.


Funder: National Research Foundation Singapore; doi:

Funder: Shell United Kingdom; doi:


Article, Ash, Particulate filter, Pressure drop, Emissions, Cracking, Sintering, Thermal treatment

Journal Title

Emission Control Science and Technology

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Springer International Publishing
Horizon 2020 (814492)
Engineering and Physical Sciences Research Council (1622599)