Department of Mechanical Engineering, School of Engineering, Aalto University, Sähkömiehentie 4J, 02150 Espoo, Finland; Department of Space, Earth and Environment, Chalmers University of Technology, Hörsalsvägen 7B, 41293 Gothenburg, Sweden.
Department of Space, Earth and Environment, Chalmers University of Technology, Hörsalsvägen 7B, 41293 Gothenburg, Sweden.
Waste Manag. 2021 Jul 1;130:117-126. doi: 10.1016/j.wasman.2021.05.023. Epub 2021 May 31.
Polyethylene terephthalate (PET) is widely used in textile fiber, film, and bottles. Although PET bottle recycling has made great progress, other PET waste is still not recycled. Gasification could be an option for recycling or recovering energy and chemicals from PET waste. However, single stream PET steam gasification in fluidized bed is seldom investigated. In this paper, individual PET gasification experiments were then conducted in a lab-scale bubbling fluidized bed to investigate how gasifying agents, temperature, residence time and steam/fuel ratio affect the product composition. The results showed that, in steam gasification, steam was the main source of H, but increasing the steam to fuel ratio cannot increase the H yield remarkably. Temperature was an essential parameter. Increasing temperature from 750 to 800 °C improved the yields of H (+87.7%), the dominant gas product CO (+40.3%), and biphenyl (+123%) notably. In contrast to other common thermoplastics, high concentrations of CO and biphenyl are the prominent characteristics of PET steam gasification. In addition, plastic steam gasification optimizations for syngas applications were discussed.
聚对苯二甲酸乙二醇酯（PET）广泛应用于纺织纤维、薄膜和瓶子。尽管 PET 瓶回收已经取得了很大的进展，但其他 PET 废物仍未得到回收。气化可能是回收或从 PET 废物中回收能源和化学品的一种选择。然而，在流化床中对单一流 PET 蒸汽气化的研究很少。本文在实验室规模的鼓泡流化床中进行了单独的 PET 气化实验，以研究气化剂、温度、停留时间和蒸汽/燃料比对产物组成的影响。结果表明，在蒸汽气化中，蒸汽是 H 的主要来源，但增加蒸汽与燃料的比例并不能显著增加 H 的产率。温度是一个重要的参数。将温度从 750°C 提高到 800°C，显著提高了 H（+87.7%）、主要气体产物 CO（+40.3%）和联苯（+123%）的产率。与其他常见的热塑性塑料相比，高浓度的 CO 和联苯是 PET 蒸汽气化的显著特点。此外，还讨论了用于合成气应用的塑料蒸汽气化优化。
