The Effect of Diesel Exhaust Fluid Dosing on Tailpipe Particle Number Emissions Cummins Emission Solutions

Format:

Conference/Event

Author/Creator:

Robinson, Robinson, author.

Contributor:

Backhaus, Jacob

Foley, Ryan

Liu, Z. Gerald

Conference Name:

SAE 2016 World Congress and Exhibition (2016-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2016

Summary:

AbstractIntroduction of modern diesel aftertreatment, primarily selective catalytic reduction (SCR) designed to reduced NOx, has increased the presence of urea decomposition byproducts, mainly ammonia, in the aftertreatment system. This increase in ammonia has been shown to lead to particle formation in the aftertreatment system. In this study, a state of the art diesel exhaust fluid (DEF)-SCR system was investigated in order to determine the influence of DEF dosing on solid particle count. Post diesel particulate filter (DPF) particle count (> 23 nm) is shown to increase by over 400% during the World Harmonized Transient Cycle (WHTC) due to DEF dosing. This increase in tailpipe particle count warranted a detailed parametric study of DEF dosing parameters effect on tailpipe particle count. Global ammonia to NOx ratio, DEF droplet residence time, and SCR catalyst inlet temperature were found to be significant factors in post-DPF DEF based particle formation. Thermogravimetric analysis (TGA) of ammonia salt particles and urea decomposition byproducts indicate significant chance of measurement using the Particle Measurement Programme (PMP) Particle Number (PN) method. These DEF based particles were not intended to be addressed by the PMP PN methodology, but are found to be over 80% of PN post DPF

Notes:

Vendor supplied data

Publisher Number:

2016-01-0995

Access Restriction:

Restricted for use by site license