On the Effects of Urea and Water Injection on Particles across the SCR Catalyst in a Heavy - Duty Euro VI Diesel Engine
Technical Paper
2020-01-2196
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
Particle emissions from heavy-duty engines are regulated both by mass and number
by Euro VI regulation. Understanding the evolution of particle size and number
from the exhaust valve to the tail pipe is of vital importance to expand the
possibilities of particle reduction. In this study, experiments were carried out
on a heavy-duty Euro VI engine after-treatment system consisting of diesel
oxidation catalyst, diesel particulate filter and selective catalytic reduction
(SCR) unit with AdBlue injection followed by ammonia slip catalyst. The present
work focusses on the SCR unit with regard to total particle number with and
without nucleation particles both. Experiments were conducted by varying the
AdBlue injection quantity, SCR inlet temperature [to vary the reaction
temperature], exhaust mass flow rate [to vary the residence time in SCR], and
fuel injection pressures [to vary inlet particle number and inlet
NOx]. Sampling for particle measurements was performed at the inlet,
upstream of the urea injector and the outlet of the SCR. Particle measurements
were made using two different two-stage dilution systems, for measuring
non-volatile and volatile particles, respectively. The total particle number
(PN) was measured using two different condensation particle counters (CPC), one
with the cut-off size at 23nm and another with a cut-off size at 7 nm to capture
nuclei mode particles. An increase in the total number of particles was observed
at 400°C and 1200 bar of fuel injection pressure with the higher AdBlue
injection quantities compared to the dry-run SCR. At 400°C, a surge in
nucleation occurs irrespective of the fuel injection pressures. An experiment
was also made to isolate the water droplets effect on PN from nitrate formation.
The SCR was injected with de-ionized water and a PN reduction was observed
across the SCR and the reduction was higher with higher inlet PN to the SCR.
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Authors
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Citation
K, A., Bernemyr, H., and Erlandsson, A., "On the Effects of Urea and Water Injection on Particles across the SCR Catalyst in a Heavy - Duty Euro VI Diesel Engine," SAE Technical Paper 2020-01-2196, 2020, https://doi.org/10.4271/2020-01-2196.Data Sets - Support Documents
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