The enormous rise in plastic waste leads to severe environmental issues and complete removal is a quiet challenge. The entire world focuses on finding new alternate for traditional conventional fuel. The waste low-density polyethylene is chosen as feedstock for the preparation of fuel from thermo-catalytic pyrolysis, considering the silica–alumina catalyst at a reaction temperature of 500 °C. From our previous study, the lower blends of waste low-density polyethylene exhibit a similar performance to diesel. However, brake thermal efficiency and oxides of nitrogen are not encouraging. Further improving combustion behaviour, the present research is carried out at different injection timings. The investigation is carried on standard injection timing of 23°bTDC and three retarded injection timings, namely, 21°bTDC, 19°bTDC and 17°bTDC. Retarded injection timing exhibits higher performance and lower unburned hydrocarbon, oxides of nitrogen and carbon monoxide emissions. However, smoke emission is increased due to the reduced heat release at all the considered test parameters. The result divulges that reduced performance and increased smoke at 17°bTDC due to the lack of burning rate. The combustion behaviour of 20% waste low-density polyethylene by volume at 19°bTDC is similar to that of diesel at 23°bTDC. Hence, the injection timing of 19°bTDC is preferred as an optimized condition for the test fuel 20% waste low-density polyethylene by volume.

塑料垃圾的大量增加导致了严重的环境问题，彻底清除塑料垃圾是一项艰巨的挑战。全世界都在为传统传统燃料寻找新的替代品。考虑到二氧化硅-氧化铝催化剂在 500 °C 的反应温度下，选择废弃的低密度聚乙烯作为热催化热解制备燃料的原料。根据我们之前的研究，废低密度聚乙烯的较低混合物表现出与柴油相似的性能。然而，制动热效率和氮氧化物并不令人鼓舞。进一步改善燃烧行为，目前的研究是在不同的喷射正时进行的。研究是在 23°bTDC 的标准喷射正时和三个延迟喷射正时进行的，即 21°bTDC、19°bTDC 和 17°bTDC。延迟喷射正时表现出更高的性能和更低的未燃烧碳氢化合物、氮氧化物和一氧化碳排放。然而，由于在所有考虑的测试参数下放热减少，烟雾排放增加。结果表明，由于缺乏燃烧速度，在 17°bTDC 时性能降低并增加了烟雾。20% 废低密度聚乙烯在 19°bTDC 时的燃烧行为与柴油在 23°bTDC 时的燃烧行为相似。因此，19°bTDC 的喷射时间是优选的，作为测试燃料 20% 废低密度聚乙烯体积的优化条件。结果表明，由于缺乏燃烧速度，在 17°bTDC 时性能降低并增加了烟雾。20% 废低密度聚乙烯在 19°bTDC 时的燃烧行为与柴油在 23°bTDC 时的燃烧行为相似。因此，19°bTDC 的喷射时间是优选的，作为测试燃料 20% 废低密度聚乙烯体积的优化条件。结果表明，由于缺乏燃烧速度，在 17°bTDC 时性能降低并增加了烟雾。20% 废低密度聚乙烯在 19°bTDC 时的燃烧行为与柴油在 23°bTDC 时的燃烧行为相似。因此，19°bTDC 的喷射时间是优选的，作为测试燃料 20% 废低密度聚乙烯体积的优化条件。