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Combustion and Exhaust Emissions in a Direct-injection Diesel Engine Dual-Fueled with Natural Gas
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Abstract
Dual-fuel operation of a direct-injection diesel engine with natural gas fuel can yield a high thermal efficiency almost comparable to the diesel operation at higher loads. The dual-fuel operation, however, at lower loads inevitably suffers from lower thermal efficiency and higher unburned fuel. To improve this problem, engine tests were carried out on a variety of engine parameters including diesel fuel injection timing advance, intake throttling and hot and cooled exhaust gas recirculation (EGR). It was found that diesel injection timing advance gave little improvement in thermal efficiency and increased NOx. Intake throttling promoted better combustion and shortened its duration with a consequent improvement in efficiency at higher natural gas fractions. Hot EGR raised thermal efficiency, reduced smoke levels, and maintained low NOx levels. Cooled EGR reduced NOx emissions but lowered thermal efficiency. The use of hot EGR is considered to be the best means to improve diesel engine dual-fuel operation with natural gas at low loads.
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Daisho, Y., Yaeo, T., Koseki, T., Saito, T. et al., "Combustion and Exhaust Emissions in a Direct-injection Diesel Engine Dual-Fueled with Natural Gas," SAE Technical Paper 950465, 1995, https://doi.org/10.4271/950465.Also In
References
- Karim G.A. “The Dual Fuel Engine,” Evans Robert L. Automotive Engine Alternatives Plenum Press New York 1987
- Sato T. Saito T. Daisho Y. “Combustion and Exhaust Emission Control in a Dual-Fueled Engine,” JSAE Paper No. 9305346 1993
- Karim G.A. “An Examination of Some Measures for Improving the Performance of Gas Fueled Diesel Engines at Light Load,” SAE Paper No. 912366
- Weavar C.S. Turner S.H. “Dual Fuel Natural Gas / Diesel Engines: Technology, Performance, and Emissions,” SAE Paper No. 940548 1994