Experimental study of regulated and unregulated emissions from a diesel engine using coal-based fuels

Abstract

Both methanol and F-T diesel can be made from coal. The use of coal-based fuels can increase coal utilization and promote the diversified development of diesel fuel. Based on F-T diesel, this study prepared coal-based fuels with methanol volume fractions of 0%, 5%, 10%, and 15%, respectively, which are represented by FM0, FM5, FM10, and FM15. The emissions of regulated and unregulated pollutants were measured on a non-road high-pressure common-rail four-cylinder turbocharged inter-cooled diesel engine. The results showed that at the rated speed (2100r/min), blending methanol with F-T diesel reduced NOX emissions and smoke emissions, but increased CO and HC emissions. Under maximum torque condition (1500r/min, 100%), the total emissions of alkanes, alkenes, aromatic hydrocarbons (AHs) and carbonyl compounds (CBCs) using FM10 are the lowest. Under nominal operating condition (2100r/min, 100%), compared with FM0, the emissions of alkanes, olefins and AHs generated by FM15 were reduced by 28.0%, 38.3% and 23.7%, respectively, and the emissions of CBCs were increased by 31.3%. Compared with other test fuels, the use of FM15 has the smallest O3 generation potential. When using FM10 fuel, the emissions of alkanes, AHs and CBCs were the highest under idle condition, and the emissions of olefins are highest during the nominal operating condition.