Abstract

In this research work, the experimental investigation on effect of preheating on the performance and emissions of a direct injection diesel engine has been reported. Four different fuels were tested using the same diesel engine: crude palm kernel oil (CPKO), preheated crude palm kernel oil (PCPKO), palm kernel oil methyl ester (PKOME) and petroleum diesel (petrodiesel) as reference fuel. A novel technique of using engine coolant to preheat the CPKO to PCPKO was employed. A bypass was created from the engine for the coolant to pass through and heat a series of coiled copper tubes inside the fuel tank and on which was the PCPKO. Preheating CPKO to obtain PCPKO reduced the viscosity by 59% and improved brake torque and brake power by 14%. BTE and BSFC of PCPKO was better than CPKO by 16% and 36%, respectively because the lowered viscosity of PCPKO facilitated a better atomization during combustion. While PKOME, biodiesel, recorded 21% less carbon monoxide and 71% less THC emissions than CPKO.

摘要

在这项研究工作中，报告了预热对直喷柴油机性能和排放影响的实验研究。使用相同的柴油发动机测试了四种不同的燃料：粗棕榈仁油 (CPKO)、预热的粗棕榈仁油 (PCPKO)、棕榈仁油甲酯 (PKOME) 和石油柴油 (petrodiesel) 作为参考燃料。采用了一种使用发动机冷却液将 CPKO 预热到 PCPKO 的新技术。从发动机创建了一个旁路，用于冷却液通过并加热燃油箱内的一系列盘绕铜管，PCPKO 位于其上。预热 CPKO 以获得 PCPKO 降低了 59% 的粘度，并提高了 14% 的制动扭矩和制动功率。PCPKO 的 BTE 和 BSFC 比 CPKO 好 16% 和 36%，分别是因为 PCPKO 的粘度降低有利于燃烧过程中更好的雾化。而生物柴油 PKOME 记录的一氧化碳排放量比 CPKO 少 21%，四氢大麻酚排放量少 71%。