Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, UAE.
Waste Manag Res. 2017 Dec;35(12):1247-1253. doi: 10.1177/0734242X17736946. Epub 2017 Nov 3.
Utilization of carbon dioxide (CO) in thermochemical treatment of waste plastics may significantly help to improve CO recycling, thus simultaneously curtailing dioxins/furans and CO emissions. Although CO is not such an effective gasifying agent as steam, a few investigations have explored the utilization of CO in conjunction with steam to achieve somewhat higher carbon conversion. This work presents a comparative evaluation study of CO and steam gasification of a typical post-consumer waste plastics mixture using an Aspen Plus equilibrium model. The effect of flow rate of gasifying medium (CO and/or steam) and gasification temperature on product gas composition, carbon conversion, and cold gas efficiency has been analyzed. Simulation results demonstrate that CO can serve as a potential gasifying agent for waste plastics gasification. The resulting product gas was rich in CO whereas CO-steam blends yield a wider H/CO ratio, thus extending the applications of the product gas.
利用二氧化碳（CO）进行废塑料热化学处理可以显著有助于提高 CO 的回收利用率，从而同时减少二恶英/呋喃和 CO 的排放。虽然 CO 不如蒸汽那样有效作为气化剂，但已有一些研究探索了利用 CO 与蒸汽结合以实现更高的碳转化率。本工作使用 Aspen Plus 平衡模型对典型消费后废塑料混合物的 CO 和蒸汽气化进行了比较评估研究。分析了气化介质（CO 和/或蒸汽）的流速和气化温度对产品气体组成、碳转化率和冷煤气效率的影响。模拟结果表明，CO 可用作废塑料气化的潜在气化剂。所得产品气体富含 CO，而 CO-蒸汽混合物则产生更宽的 H/CO 比，从而扩展了产品气体的应用范围。
