Chemical Engineering Department, Institute of Technology, Nirma University, Ahmedabad, 382481, Gujarat, India.
Chemical Engineering Department, Institute of Technology, Nirma University, Ahmedabad, 382481, Gujarat, India.
J Environ Manage. 2024 Apr;356:120446. doi: 10.1016/j.jenvman.2024.120446. Epub 2024 Mar 13.
There is a serious concern about the large amount of accumulated plastic waste all around the world. Synthetic polymers such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (HDPE, LDPE) are substantially present in the plastic waste generated. There are various methods reported to minimise such plastics waste with certain limitations. To overcome such limitations the present study have been carried out in which thermal decomposition of plastic waste of PET, PP, HDPE, and LDPE studied using a novel plasma pyrolysis reactor. The major objective of this work is to investigate the viability of the continuous plasma pyrolysis process for the treatment of various plastic wastes with respect to waste volume reduction and production of combustible hydrogen-rich fuel gas. The effect of temperature and feed flow rate on product gas yield, product gas efficiency, solid residue yield, and H/CO ratio has been evaluated. The experiments have been carried out at different temperatures within the range of 700-1000 °C. Plasma pyrolysis system exhibited combustible hydrogen-rich gas as a product and solid residue. Liquid products have not been observed during plasma pyrolysis, unlike conventional pyrolysis. The reaction mechanism of plastic cracking has been discussed based on literature and products obtained in the present work. The effects of feed flow rate and temperature on exergy efficiency were studied using the response surface method. The mass, energy, and exergy analyses have also been carried out for all the experiments, which are in the range of 0.95-0.99, 0.48 to 0.77, and 0.30 to 0.69, respectively.
全世界都非常关注大量积累的塑料废物。在产生的塑料废物中，大量存在着诸如聚对苯二甲酸乙二醇酯（PET）、聚丙烯（PP）和聚乙烯（高密度聚乙烯、低密度聚乙烯）等合成聚合物。已经有各种报道的方法可以最大限度地减少这种塑料废物，但存在一定的局限性。为了克服这些局限性，本研究使用新型等离子体热解反应器对 PET、PP、HDPE 和 LDPE 的塑料废物进行了热分解研究。这项工作的主要目的是研究连续等离子体热解工艺在处理各种塑料废物方面的可行性，以减少废物体积并生产可燃富氢燃料气。考察了温度和进料速率对产气体积收率、产气体积效率、固体残渣收率和 H/CO 比的影响。实验在 700-1000°C 的范围内进行了不同温度下的实验。等离子体热解系统显示出作为产品的可燃富氢气和固体残渣。与传统热解不同，在等离子体热解过程中没有观察到液体产物。根据文献和本工作中获得的产物，讨论了塑料裂解的反应机制。使用响应面法研究了进料速率和温度对火用效率的影响。对所有实验进行了质量、能量和火用分析，其范围分别为 0.95-0.99、0.48 至 0.77 和 0.30 至 0.69。
