Recovery of energy from waste is appealing as it meets the energy demand and minimize the problems associated with waste management. Biodiesel derived from waste cooking oil was used in this study along with 1-propanol and 1-hexanol to make a comparative assessment of the alcohol addition on different diesel engine characteristics. Experimental trials were carried out by utilizing two ternary blends with 20% by volume of higher alcohols (propanol & hexanol), 30% by volume of biodiesel and 50% by volume of diesel. Later, the results were compared with binary blend of 50% by volume of diesel and 50% by volume of biodiesel (D50B50), pure diesel (D100) and biodiesel (B100). Results divulge that ignition delay period got longer for both Pr20 blend and HX20 blend which resulted in a 2% and 1% increase in peak cylinder pressure and 26% and 15% increase in peak heat release rate respectively against D50B50 blend operation. In comparison with the binary blend, the engine brake thermal efficiency improved by 3% and deteriorated by 2% against hexanol and propanol blend respectively. The NOx emission aggravated with ternary blends, nearly 8% higher NOx emission was observed for propanol blend when compared to hexanol blend. Both smoke opacity and carbon monoxide emission reduced, while unburnt hydrocarbon emission was on the higher side with the introduction of alcohol. It is concluded from the observations that the HX20 blend was found to be optimal in terms of improved engine performance and emission characteristics.

从废物中回收能源很有吸引力，因为它可以满足能源需求，并最大限度地减少与废物管理相关的问题。在这项研究中，使用了来自废食用油的生物柴油，以及1-丙醇和1-己醇，以比较评估不同柴油发动机特性下的酒精添加量。通过利用两种三元共混物进行实验，其中三元共混物具有20体积％的高级醇（丙醇和己醇），30体积％的生物柴油和50体积％的柴油。随后，将结果与50％体积的柴油和50％体积的生物柴油（D50B50），纯柴油（D100）和生物柴油（B100）的二元混合物进行了比较。结果表明，Pr20混合气和HX20混合气的点火延迟时间都更长，与D50B50混合气操作相比，峰值气缸压力分别提高了2％和1％，峰值放热率分别提高了26％和15％。与二元混合物相比，与己醇和丙醇混合物相比，发动机制动热效率分别提高了3％和2％。三元混合物会加剧NOx排放，与己醇混合物相比，丙醇混合物的NOx排放高出近8％。引入酒精后，烟的不透明度和一氧化碳排放均降低，而未燃烧的碳氢化合物排放则更高。从观察结果可以得出结论，就改善发动机性能和排放特性而言，发现HX20混合物是最佳的。