Gopinath Soundararajan, Devan P K, Pitchandi K
Department of Mechanical Engineering, RMK College of Engineering and Technology Puduvoyal - 601 206 Tamil Nadu India
Department of Mechanical Engineering, Sri Venkateswara College of Engineering Sriperumbudur - 602 117 Tamil Nadu India.
RSC Adv. 2020 Oct 12;10(61):37266-37279. doi: 10.1039/d0ra07073d. eCollection 2020 Oct 7.
A rapid increase in the use of non-biodegradable plastics and their disposal after use has had a detrimental impact on the environment. Used plastics (used low-density polyethylene - ULDP) were selected as feedstock for the extraction of pyrolytic oil. The pyrolysis process was carried out in a semi-batch reactor with a silica alumina catalyst in the existence of fluidizing gas N in a reactor at 500 °C for 60 min. The maximum liquid, gas, and char yields were 93.5 wt%, 5.4 wt%, and 1.1 wt%, respectively. Experimental analysis was carried out to obtain their functional and structural groups by FT-IR and the carbon distribution was identified by GC-MS analysis. The blends of 20%, 40%, 60%, 80%, and 100% on a volume basis were chosen for the detailed study. For the pyrolytic blends, the combustion, performance, and emission characteristics were tested at different engine loads. During combustion, the heat release rate was extremely high for neat ULDP oil because of the high energy content and a higher cetane index. The efficiency of ULDP20 was higher than in other blends, whereas NOx and smoke emissions of ULDP20 were lower among the blends but higher than diesel. ULDP20 performed similarly as diesel. Hence, ULDP20 is recommended as a fuel for the diesel engine.
不可生物降解塑料的使用及其使用后处理量的迅速增加对环境产生了不利影响。选用废旧塑料（废旧低密度聚乙烯 - ULDP）作为热解油提取的原料。热解过程在半间歇式反应器中进行，使用硅铝催化剂，在反应器中于500℃通入流化气体N 60分钟。液体、气体和焦炭的最大产率分别为93.5 wt%、5.4 wt%和1.1 wt%。通过傅里叶变换红外光谱（FT - IR）进行实验分析以获得其官能团和结构基团，并通过气相色谱 - 质谱联用（GC - MS）分析确定碳分布。详细研究选用了体积比为20%、40%、60%、80%和100%的混合物。对于热解混合物，在不同发动机负荷下测试了其燃烧、性能和排放特性。在燃烧过程中，由于高能量含量和较高的十六烷值，纯ULDP油的热释放率极高。ULDP20的效率高于其他混合物，而ULDP20的氮氧化物和烟雾排放在混合物中较低，但高于柴油。ULDP20的性能与柴油相似。因此，推荐将ULDP20作为柴油发动机的燃料。
