This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Acidic Condensation in HP EGR Systems Cooled at Low Temperature Using Diesel and Biodiesel Fuels
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 05, 2010 by SAE International in United States
Annotation ability available
In order to further reduce NOx emissions in increasing HP EGR cooler performance, several OEMs have decided to use a secondary cooling loop dedicated to bring cold water (around 35°C) to the HP EGR heat exchanger. Nevertheless, strongly cooled EGR gases can condensate in the cooler-producing acidic liquids which can corrode some parts in the loop. It is therefore necessary to define EGR components compatible with such kind of environment and constraints.
Testing was performed on a 2.0-liter EU4 diesel engine, using a large panel of current fuels including neat biodiesels from soybean, rapeseed or palm, as well as low and high sulfur petroleum-based diesels. In order to cover all existing cycle conditions, the HP EGR is cooled from 20°C to 90°C independently from the engine coolant circuit. In the aim to perform a fair comparison among biodiesels and diesels, injection and air mass flow setpoints coming from the serial EU4 calibration were adapted to achieve same torque and similar NOx emissions for all fuels.
As expected, at a constant air mass flow setpoint, a strong EGR cooling allows a noticeable reduction of NOx emissions due to a significant increase of the EGR rate. Volumes and acidity of condensates were measured: as calculated and correlated by means of psychrometric charts, and depending on the calibration, tests show that condensation occurs for gas temperatures below 50°C and represent up to 400 ml/h at 20°C ambient temperature. Condensate acidity is similar for all tested fuels and stays within an acceptable range for products in series.
CitationBourgoin, G., Tomas, E., Lujan, J., and Pla, B., "Acidic Condensation in HP EGR Systems Cooled at Low Temperature Using Diesel and Biodiesel Fuels," SAE Technical Paper 2010-01-1530, 2010, https://doi.org/10.4271/2010-01-1530.
- Lapuerta, M. Hernandez, JJ. Gimenez, F. “Evaluation of exhaust gas recirculation as a technique for reducing diesel engine NOx emissions” Proc. Inst. Mech. Eng. Part D-J. Automob. Eng. 214 85 93 2000
- Moroz, S. Bourgoin, G. Luján, J.M. Pla, B. “Acidic Condensation in Low Pressure EGR Systems using Diesel and Biodiesel Fuels,” SAE Int. J. Fuels Lubr. 2 2 305 312 2009
- Lapuerta, M. Hernandez, JJ. Ballesteros, R. Duran, A. “Composition and size of diesel particulate emissions from a commercial European engine tested with present and future fuels” Proc. Inst. Mech. Eng. Part D-J. Automob. Eng. 217
- Agarwal, A.K. “Biofuels (alcohols and biodiesel) applications as fuels for internal combustion engines” Progress in Energy and Combustion Science 33 233 271 2007
- Biodiesel Handling and Use Guide Fourth Edition National Renewable Energy Laboratory 2008
- Kawano, D. Ishii, H. Goto, Y. Noda, A. et al. “Application of Biodiesel Fuel to Modern Diesel Engine,” SAE Technical Paper 2006-01-0233 2006
- International Fuel Quality Center “International Diesel Rankings - Top 100 Sulfur” http://www.ifqc.org/NM_Top5.aspx September 2009
- Girard, J.W. Gratz, L.D. Johnson, J.H. Bagley, S.T. et al. “A Study of the Character and Deposition Rates of Sulfur Species in the EGR Cooling System of a Heavy-Duty Diesel Engine,” SAE Technical Paper 1999-01-3566 1999
- Kreso, A.M. Johnson, J.H. Gratz, L.D. Bagley, S.T. et al. “A Study of the Vapor- and Particle-Phase Sulfur Species in the Heavy-Duty Diesel Engine EGR Cooler,” SAE Technical Paper 981423 1998
- Lapuerta, M. Armas, O. Rodríguez-Fernández, J. “Effect of biodiesel fuels on diesel engine emissions” Progress in Energy and Combustion Science 34 198 223 2008
- Ban-Weiss, G.A. Chen, J.Y. Buchholz, B.A. Dibble, R.W. “A numerical investigation into the anomalous slight NOx increase when burning biodiesel; A new (old) theory” Fuel Processing Technology 88 7 659 667 2007
- Moroz, S. Bourgoin, G. Luján, J.M. Pla, B. “Advanced Cooling Systems for Low Pressure Exhaust Gas Recirculation in a Turbocharged Diesel Passenger Car Engine” FISITA World Automotive Congress, F2008-06-0152 2008