Development of an Engine Test to Rate the EGR Deposit Formation Propensity of Fuels in Light-Duty Diesel Engines
- Rod Williams - Shell Global Solutions (UK) ,
- Stephen Cook - Innospec Ltd ,
- Keith Woodall - Innospec Ltd ,
- Christopher Clayton - Shell Global Solutions (UK) ,
- Michael Gee - Shell Global Solutions (UK) ,
- Simon Mulqueen - Innospec Ltd ,
- Jacqueline Reid - Innospec Ltd ,
- John Rimmer - Shell Global Solutions (UK) ,
- Alan Ross - Innospec Ltd
Journal Article
2020-01-2096
ISSN: 2641-9645, e-ISSN: 2641-9645
Sector:
Topic:
Citation:
Williams, R., Cook, S., Woodall, K., Clayton, C. et al., "Development of an Engine Test to Rate the EGR Deposit Formation Propensity of Fuels in Light-Duty Diesel Engines," SAE Int. J. Adv. & Curr. Prac. in Mobility 3(1):337-348, 2021, https://doi.org/10.4271/2020-01-2096.
Language:
English
Abstract:
Exhaust Gas Recirculation (EGR) is employed in diesel engines to reduce
engine-out NOx. Carbon-containing deposits form in the EGR systems of modern
diesel engines as the particulate matter, hydrocarbons and other entrained
species deposit from the exhaust gas flow as it cools. Much work has been done
by Original Equipment Manufacturers (OEMs) to reduce deposits and mitigate their
effects by optimized dimensioning of EGR coolers and valves, introduction of EGR
cooler bypass for use in the most sensitive cold conditions and experimenting
with oxidation catalysts upstream of the EGR system. Nevertheless, deposits
forming in the high-pressure Exhaust Gas Recirculation (HP-EGR) systems of
modern diesel engines can sometimes lead to a number of problems including
emissions and fuel consumption deterioration, poor performance and drivability,
as well as breakdowns. An engine test method has been developed to enable the
impact of fuel on deposits in the HP-EGR system to be studied. This paper
describes the work undertaken in the test development and initial fuel effects
testing to prove the discriminatory power of the method. In the test method a
4-cylinder light-duty diesel engine of 1.6L displacement runs at conditions
conducive to EGR deposit formation over 24 hours and the impact of fuels on
deposit formation is determined through weighing of the EGR system components
before and after the test. Initial tests comparing a B7 representative of
European EN590 diesel fuel and a Fischer-Tropsch Gas-to-Liquid (GTL) gasoil fuel
showed that 72% less deposit formed with GTL than with B7. This work provides a
foundation for further study of fuel effects on EGR deposits.