Performance and emissions of a heavy-duty diesel engine fuelled with diesel and LNG (liquid natural gas)

This paper presents the effects of liquid natural gas on a heavy-duty diesel engine. Natural gas was used as primary fuel, while a pilot amount of diesel was used as an ignition source. The amount of each fuel was adjusted to obtain comparable brake torque and power output from the dual engine operation, while no knocking was observed. The engine performance and emissions from the diesel and dual fuel engine tests were conducted over the engine speed range between 1100 and 1900 rpm. The engine performance included torque, power, specific fuel consumption (SFC), volume efficiency, and thermal efficiency. The emissions tested were total hydrocarbon (THC), nitrogen oxides (NOx), carbon dioxide (CO2) and carbon monoxide (CO) emissions. The results showed that the maximum portion of natural gas in the dual fuel engine operation was up to 77.90% at 1300 rpm. Compared to the diesel operation, the dual fuel operation showed less specific fuel consumption, thermal efficiency, and volumetric efficiency. The emissions of THC and CO from the dual fuel engine operation were higher, while the emissions of NOx and CO2 were lower.

[1]  Nakorn Tippayawong,et al.  Long-term operation of a small biogas/diesel dual-fuel engine for on-farm electricity generation , 2007 .

[2]  Ghazi A. Karim,et al.  Combustion in Gas Fueled Compression: Ignition Engines of the Dual Fuel Type , 2003 .

[3]  S. Murugan,et al.  Investigation on combustion performance and emission characteristics of a DI (direct injection) diesel engine fueled with biogas–diesel in dual fuel mode , 2014 .

[4]  Mohamed Y. E. Selim,et al.  Pressure-time characteristics in diesel engine fueled with natural gas , 2001 .

[5]  G. Karim,et al.  An Examination of the Ignition Delay Period in Gas-Fueled Diesel Engines , 1998 .

[6]  A Henham,et al.  Combustion of simulated biogas in a dual-fuel diesel engine , 1998 .

[7]  Satish Kumar,et al.  LNG: An eco-friendly cryogenic fuel for sustainable development , 2011 .

[8]  Mohand Tazerout,et al.  Towards improvement of natural gas-diesel dual fuel mode: An experimental investigation on performance and exhaust emissions , 2014 .

[9]  Dimitrios T. Hountalas,et al.  Experimental investigation concerning the effect of natural gas percentage on performance and emissions of a DI dual fuel diesel engine , 2003 .

[10]  K. A. Subramanian,et al.  A CFD (computational fluid dynamics) study for optimization of gas injector orientation for performance improvement of a dual-fuel diesel engine , 2013 .

[11]  Willard W. Pulkrabek,et al.  Engineering Fundamentals of the Internal Combustion Engine , 1997 .

[12]  T. Korakianitis,et al.  Natural-gas fueled spark-ignition (SI) and compression-ignition (CI) engine performance and emissions , 2011 .

[13]  Dimitrios T. Hountalas,et al.  Combustion and exhaust emission characteristics of a dual fuel compression ignition engine operated with pilot Diesel fuel and natural gas , 2004 .

[14]  G. Kadijk,et al.  Environmental and economic aspects of using LNG as a fuel for shipping in The Netherlands , 2011 .

[15]  O. M. I. Nwafor,et al.  Effect of advanced injection timing on the performance of natural gas in diesel engines , 2000 .

[16]  Dimitrios T. Hountalas,et al.  Theoretical study of the effects of engine parameters on performance and emissions of a pilot ignited natural gas diesel engine , 2010 .

[17]  A. Bounif,et al.  Gas-Diesel (dual-fuel) modeling in diesel engine environment , 2001 .

[18]  O. M. I. Nwafor,et al.  Knock characteristics of dual-fuel combustion in diesel engines using natural gas as primary fuel , 2002 .

[19]  Fabio Polonara,et al.  Life-cycle greenhouse gas analysis of LNG as a heavy vehicle fuel in Europe , 2010 .

[20]  O. M. I. Nwafor,et al.  Effect of advanced injection timing on emission characteristics of diesel engine running on natural gas , 2007 .

[21]  Mohamed Y. E. Selim,et al.  Sensitivity of dual fuel engine combustion and knocking limits to gaseous fuel composition , 2004 .

[22]  O. A. Badr,et al.  Effect of injection timing on the performance of a dual fuel engine , 2002 .