EFFECTS OF PARTIAL RCCI APPLICATION OF LPG ON PERFORMANCE, COMBUSTION AND EXHAUST EMISSIONS IN A DIESEL ENGINE POWERED GENERATOR

Abstract

In this study, engine performance, combustion and emissions a diesel engine used for driving an electrical generator was investigated with LPG fumigation into the manifold of the engine as secondary fuel. Tests were carried out in 4 cylinders, 4 strokes water-cooled and direct-injection diesel engine generator. According to the test results; cylinder pressure, average gas temperature and peak values of heat release rate were increased as amount of LPG was increased. However, brake specific fuel consumption and mass fuel consumption were higher. Generally, with LPG addition, CO and HC emissions were found higher. Up to 40% LPG addition, CO₂ emissions were lowered and over 40% LPG addition, CO₂ emission increased. With increasing LPG ratio, there was a decrease in NOx emission values. On the other hand, generally, as LPG content was increased, O₂ emissions were decreased significantly. Generally, the usage of LPG until certain levels found to be possible as secondary fuel in diesel engines. However, its usage in the engine up to certain levels resulted in considerable negative changes in performance, combustion and emissions changes. Over 55% LPG fumigation resulted in quite high flame velocity and propagation which eventually resulted in the accelerated pressure increase for per crank angle. This condition may be accepted as the starting of the knock. Therefore, only certain low amounts of LPG usage as secondary nonreactive fuel in diesel engine were found to be possible.

Keywords

• : Diesel engine
• Dual-Fuel system
• Emission
• LPG
• Performance

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