Investigation of solid particle number measurement: Existence and nature of sub 23 nm particles under PMP methodology

Zhongqing Zheng, Kent C. Johnson, Thomas D. Durbin, Shaohua Hu, Tao Huai, David B. Kittelson, Heejung S. Jung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A Particle Measurement Programme (PMP)-compliant system, an AVL advanced particle counter (APC) and an alternative volatile particle removal system, a catalytic stripper (CS) were evaluated and compared for measuring solid particle number (PN) emissions. The evaluations and comparisons were conducted using diluted exhaust from a diesel particle filter (DPF)-equipped heavy-duty diesel vehicle operated on a heavy-duty chassis dynamometer under steady speed conditions at two different engine loads. PN emissions between 3 and 10 nm downstream the APC were ∼ 2 and 7 times higher than the PN emissions of particles above 10 nm at the 74 and 26% engine load, respectively. At the 26% engine load, PN level of the 3 to 10 nm particles downstream the APC were significantly higher than that in the dilution tunnel, demonstrating that the APC was making 3 to 10 nm particles. The PN emission of 3 to 10 nm particles downstream the APC was related to the heating temperature of the APC evaporation tube, suggesting these particles are artifacts formed by renucleation of semivolatiles. Considerably fewer particles between 3 to 10 nm were seen downstream of the CS for both engine loads due mainly to removal of semivolatile material by the catalytic substrates, although some of this difference could be attributed to diffusion and thermophoretic losses. The findings of this study imply that improvement of the current PMP protocol would be necessary if the PMP were to be used in other applications where the PN emissions of particles below 23 nm are important.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 Fall Meeting
PublisherWestern States Section/Combustion Institute
Pages455-461
Number of pages7
ISBN (Electronic)9781618393043
StatePublished - Jan 1 2011
EventFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 - Riverside, United States
Duration: Oct 17 2011Oct 18 2011

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011 Fall Meeting

Other

OtherFall Technical Meeting of the Western States Section of the Combustion Institute 2011, WSS/CI 2011
CountryUnited States
CityRiverside
Period10/17/1110/18/11

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