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.
Highlights
Internal combustion engines (ICEs) are a major source for particulate matter (PM) emissions [1]
The introduction of regulations governing particle number (PN) emissions has driven the introduction of gasoline particulate filters (GPFs) on gasoline direct injection (GDI) vehicles [9,10,11]
A particulate filter model has been developed to simulate the change in the behaviour of ash-contaminated particulate filters when the filters are thermally treated by exposing them to high temperatures
Summary
Internal combustion engines (ICEs) are a major source for particulate matter (PM) emissions [1]. Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore standards and more rigorous testing protocols to reduce pollution [4,5,6,7] from ICEs. Diesel particulate filters (DPFs) have been widely adopted for diesel-fuelled engines in order to comply with these emission standards [8]. The introduction of regulations governing particle number (PN) emissions has driven the introduction of gasoline particulate filters (GPFs) on gasoline direct injection (GDI) vehicles [9,10,11]. The typical operating cycle of a particulate filter involves the collection of solid particles, followed by an active regeneration process that reduces the pressure drop of the filter by burning off the trapped particles.
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