An Experimental and Comparative study about the engine emissions of conventional diesel engine and dual fuel engine.

Because of the high thermal effectiveness, consistency, flexibility and economical cost diesel engines are extensively used in the world. Diesel engine emissions are producing serious environmental pollution which consists of oxides of nitrogen (NOX), carbon monoxide (CO) and particulate matter (PM). So it’s necessary to find the alternate solution to control diesel emissions. Natural gas is a highly attractive due to its clean burning, low cost and wide spread availability. In this experimental work, single cylinder (8.6 Hp LA186F) four stroke conventional diesel engine was studied. Natural gas is the major gaseous fuel used in dual fuel method which is up to 80% while diesel is used as a pilot fuel for the source of ignition up to 20%. In comparison with the conventional diesel method, it was observed that the dual fuel method significantly reduces the NOX maximum up to 68%, carbon dioxide (CO2) up to 50% and CO maximum up to 72%. However, the HC increased several times, even more than the 5 times in comparison with normal diesel combustion. During dual fuel method the emissions of HCand NOX shows the trade-off connection.