Effect of Exhaust Gas Recirculation on Performance and Emission Characteristics of a Diesel-Piloted Biogas Engine


In this research, a Direct Injection Compression Ignition (DICI) engine was modified into a dual-fuel engine that used biogas as the primary fuel and diesel as pilot fuel, with the focus on reduction of harmful exhaust emissions while maintaining high thermal efficiency. The effect of exhaust gas recirculation (EGR) on engine performance and emission characteristics was studied. The EGR system was developed and tested with different EGR percentages, i.e. 0%, 10%, 20% and 30%. The effect of EGR on exhaust gas temperature and performance parameters like brake specific fuel consumption, brake power and brake thermal efficiency was studied. The performance and emission characteristics of the modified engine were compared with those of the conventional diesel engine. The results showed that EGR led to a decrease in specific fuel consumption and an increase in brake thermal efficiency. With increase in percent (%) of EGR, the percentage increase in brake thermal efficiency was up to 10.3% at quarter load and up to 14.5% at full load for single fuel operation while for dual-fuel operation an increase up to 9.5% at quarter load and up to 11.2% at full load was observed. The results also showed that EGR caused a decrease in exhaust gas temperature; hence it’s potential to reduce NOX emission. However, emissions of HC and CO increased slightly with EGR.

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Hawi, M. , Kiplimo, R. and Ndiritu, H. (2015) Effect of Exhaust Gas Recirculation on Performance and Emission Characteristics of a Diesel-Piloted Biogas Engine. Smart Grid and Renewable Energy, 6, 49-58. doi: 10.4236/sgre.2015.64005.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Karim, G.A. (2003) Combustion in Gas Fueled Compression: Ignition Engines of the Dual Fuel Type. Journal of Engineering for Gas Turbines and Power, 125, 827-836.
[2] Tippayawong, N., Promwungkwa, A. and Rerkkriangkrai, P. (2007) Long Term Operation of a Small Biogas/Diesel Dual-Fuel Engine for On-Farm Electricity Generation. Bio-Systems Engineering, 98, 26-32.
[3] Kumar, N.R., Sekhar, Y.M.C. and Adinarayana, S. (2013) Effects of Compression Ratio and EGR on Performance, Combustion and Emissions of Direct Injection Diesel Engine. International Journal of Applied Science and Engineering, 11, 41-49.
[4] Agrawal, A.K., Singh, S.K., Sinha, S. and Shukla, M.K. (2004) Effect of EGR on the Exhaust Gas Temperature and Exhaust Opacity in Compression Ignition Engines. Sadhana, 29, 275-284.
[5] Hosseinzadeh, A., Saray, R.K. and Mahmoudi, S.M.S. (2010) Comparison of Thermal, Radical and Chemical Effects of EGR Gases Using Availability Analysis in Dual-Fuel Engines at Part Loads. Energy Conversion and Management, 51, 2321-2329.
[6] Venkateswarlu, K., Murthy, B.S.R.C. and Subbarao, V.V. (2013) The Effect of Exhaust Gas Recirculation and Di-Tertiary Butyl Peroxide on Diesel-Biodiesel Blends for Performance and Emission Studies. International Journal of Advanced Science and Technology, 54, 49-60.
[7] Mahla, S.K., Das, L.M. and Babu, M.K.G. (2010) Effect of EGR on Performance and Emission Characteristics of Natural Gas Fueled Diesel Engine. Jordan Journal of Mechanical and Industrial Engineering, 4, 523-530.

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