Pyrolysis as a value added method for plastic waste management: A review on converting LDPE and HDPE waste into fuel

P. G. I. Uthpalani, J. K. Premachandra, D. S. M. De Silva, V. P. A. Weerasinghe
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引用次数: 1

Abstract

The global demand for plastic is increasing year by year due to its indispensable uses and excellent properties. Plastic wastes persist for many years due to their slow deterioration and cause severe environmental problems. Therefore, there is a growing focus worldwide on plastic waste disposal methods to overcome adverse environmental impacts. As plastics are petroleum-based materials, the pyrolysis of plastics to fuel oil, gases, and char, has more concern than the other plastic waste management methods of recycling and landfilling. A yield of 70-80 wt.% of liquid fuel from pyrolysis waste has been reported elsewhere, emerging the importance and aptness of this method in plastic waste management. The common reactor types for the pyrolysis process are batch reactor, semi-batch reactor, spouted bed reactor, and fluidized bed reactor.  The common catalysts employed in plastic pyrolysis were zeolites, including ZSM-5, HUSY, Zeolite X, and Y. The pore structure and the catalyst’s acidity are the most influencing parameters in increasing the liquid yield and the quality of the oil produced in the pyrolysis process. This paper reviews the existing literature on pyrolysis processes developed for HDPE and LDPE wastes globally and their governing factors. Furthermore, emissions in the pyrolysis process and engine combustion of the fuel oil, performance, and emission characteristics were discussed. Although plastic waste separation prior to its management is a challenging process, this review highlights the conversion of waste plastic into energy as a smart way to meet the rising demands.
热解作为塑料废物管理的一种增值方法:LDPE和HDPE废物转化为燃料的综述
由于其不可缺少的用途和优异的性能,全球对塑料的需求逐年增加。塑料垃圾因其降解缓慢而存在多年,造成严重的环境问题。因此,全世界越来越关注塑料废物的处理方法,以克服不利的环境影响。由于塑料是石油基材料,与回收和填埋等其他塑料废物管理方法相比,将塑料热解为燃料油、气体和木炭更受关注。70- 80wt .%的液体燃料的产率从热解废物已被报道在其他地方,新兴的重要性和这种方法在塑料废物管理的适用性。热解过程常用的反应器类型有间歇式反应器、半间歇式反应器、喷淋床反应器和流化床反应器。塑料热解常用的催化剂为沸石,包括ZSM-5、HUSY、X型沸石和y型沸石。其中,孔隙结构和催化剂酸度是提高热解产液率和产油质量影响最大的参数。本文综述了国内外关于HDPE和LDPE废弃物热解工艺及其影响因素的文献。此外,还讨论了燃料油在热解过程和发动机燃烧过程中的排放、性能和排放特征。尽管塑料废物在管理之前进行分类是一个具有挑战性的过程,但本综述强调,将废塑料转化为能源是满足日益增长的需求的一种明智方式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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