Abstract

In this study, biodiesel produced from seeds obtained from a Nigerian bioengineered rubber tree (Hevea brasiliensis, NIG800 series) was investigated for engine performance analysis and emission study. All tests were conducted for diesel, biodiesel, and blends over the entire speed range (1500–3500 rpm, at increments of 500 rpm) under full load operating conditions. The results showed that the brake specific fuel consumption is higher for biodiesel and blends compared to diesel due to the lower heating value of the biodiesel, but B20 and diesel results were the same (0.20 kg/kWh) at 2750 rpm. Exhaust gas temperature is significantly higher for biodiesel because the higher oxygen content (10–12%) and higher cetane number assisted complete combustion. Engine power, brake thermal efficiency, and engine torque were higher with diesel fuel compared to biodiesel and blends because of the higher energy content of diesel fuel. There is a significant reduction in carbon monoxide, unburned total hydrocarbons, and smoke opacity with biodiesel, but nitric oxide and carbon dioxide increased slightly. The B20 blend at 2500 rpm shows the best performance, and biodiesel sourced from rubber seeds is environmentally friendly and can be used in modern diesel engines without technical modifications.

摘要

在这项研究中，从尼日利亚生物工程橡胶树 ( Hevea brasiliensis ) 的种子中提取的生物柴油, NIG800 系列）用于发动机性能分析和排放研究。所有测试均针对柴油、生物柴油和混合物在全负荷运行条件下在整个速度范围（1500-3500 rpm，以 500 rpm 的增量）进行。结果表明，由于生物柴油的热值较低，与柴油相比，生物柴油和混合物的制动比燃料消耗更高，但在 2750 rpm 时 B20 和柴油的结果相同（0.20 kg/kWh）。生物柴油的废气温度明显较高，因为较高的氧含量（10-12%）和较高的十六烷值有助于完全燃烧。与生物柴油和混合物相比，柴油燃料的发动机功率、制动热效率和发动机扭矩更高，因为柴油燃料的能量含量更高。使用生物柴油可以显着减少一氧化碳、未燃烧的总碳氢化合物和烟雾不透明性，但一氧化氮和二氧化碳略有增加。2500 rpm 的 B20 混合物表现出最佳性能，从橡胶种子中提取的生物柴油是环保的，无需技术改造即可用于现代柴油发动机。