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2016 ; 60
(2
): 252-62
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gab.com Text
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Emissions from a Diesel Engine using Fe-based Fuel Additives and a Sintered Metal
Filtration System
#MMPMID26424805
Bugarski AD
; Hummer JA
; Stachulak JS
; Miller A
; Patts LD
; Cauda EG
Ann Occup Hyg
2016[Mar]; 60
(2
): 252-62
PMID26424805
show ga
A series of laboratory tests were conducted to assess the effects of
Fe-containing fuel additives on aerosols emitted by a diesel engine retrofitted
with a sintered metal filter (SMF) system. Emission measurements performed
upstream and downstream of the SMF system were compared, for cases when the
engine was fueled with neat ultralow sulfur diesel (ULSD) and with ULSD treated
with two formulations of additives containing Fe-based catalysts. The effects
were assessed for four steady-state engine operating conditions and one transient
cycle. The results showed that the SMF system reduced the average total number
and surface area concentrations of aerosols by more than 100-fold. The total mass
and elemental carbon results confirmed that the SMF system was indeed very
effective in the removal of diesel aerosols. When added at the recommended
concentrations (30 p.p.m. of iron), the tested additives had minor adverse
impacts on the number, surface area, and mass concentrations of filter-out (FOut)
aerosols. For one of the test cases, the additives may have contributed to
measurable concentrations of engine-out (EOut) nucleation mode aerosols. The
additives had only a minor impact on the concentration and size distribution of
volatile and semi-volatile FOut aerosols. Metal analysis showed that the
introduction of Fe with the additives substantially increased Fe concentration in
the EOut, but the SMF system was effective in removal of Fe-containing aerosols.
The FOut Fe concentrations for all three tested fuels were found to be much lower
than the corresponding EOut Fe concentrations for the case of untreated ULSD
fuel. The results support recommendations that these additives should not be used
in diesel engines unless they are equipped with exhaust filtration systems. Since
the tested SMF system was found to be very efficient in removing Fe introduced by
the additives, the use of these additives should not result in a measurable
increase in emissions of de novo generated Fe-containing aerosols. The findings
from this study should promote a better understanding of the benefits and
challenges of using sintered metal systems and fuel additives to control the
exposure of underground miners and other workers to diesel aerosols and gases.
|*Gasoline
[MESH]
|Aerosols/*analysis
[MESH]
|Air Pollutants, Occupational/analysis
[MESH]
|Carbon/analysis
[MESH]
|Filtration/instrumentation/*methods
[MESH]
|Gases/analysis
[MESH]
|Humans
[MESH]
|Iron/*analysis
[MESH]
|Metals
[MESH]
|Mining
[MESH]
|Occupational Exposure/prevention & control
[MESH]