Deducing targets of emerging technologies based on ex ante life cycle thinking: Case study on a chlorine recovery process for polyvinyl chloride wastes
Deducing targets of emerging technologies based on ex ante life cycle thinking: Case study on a chlorine recovery process for polyvinyl chloride wastes
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DOI：
10.1016/j.resconrec.2019.104500
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发表时间：
2019-12
影响因子：
13.2
通讯作者：
Jiaqi Lu;S. Kumagai;H. Ohno;T. Kameda;Yuko Saito;T. Yoshioka;Y. Fukushima
中科院分区：
文献类型：
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作者：
Jiaqi Lu;S. Kumagai;H. Ohno;T. Kameda;Yuko Saito;T. Yoshioka;Y. Fukushima
一种用于聚氯乙烯（PVC）废物的新型氯（Cl）回收方法可以潜在地避免在热处理期间形成不期望的含Cl化合物，改善烃可用性，并创建Cl循环系统。在这里，使用在日本的案例研究，我们采用了一种基于onex前生命周期思维的方法，以指导未来发展的Cl回收过程中的潜在能源效率和温室气体（GHG）排放。首先，与当前PVC废物处理相关的能源消耗和温室气体排放进行了调查，以基准评估过程。其次，基于化学计量学原理，利用实验和物质流分析方法，建立了含脱氯度X和P/K（由运行条件决定的变量）两个变量的生命周期清单模型。使用LCI，潜在的净能耗和温室气体排放的Cl回收过程中的调查变量的基础上得到的。然后，通过与基准值的比较，推导出变量值的目标阈值。通过贡献度分析，虽然脱氯工艺将成为能源消耗的热点，但PVC废弃物热加工尾气的降氯处理和回收盐可以产生能源信用。可接受的变量阈值可用于建议工业规模Cl回收工艺的开发目标设定。
A novel chlorine (Cl) recovery process for polyvinyl chloride (PVC) wastes can potentially avoid the formation of undesirable Cl-containing compounds during thermal treatments, improve hydrocarbon usability, and create a Cl circulation system. Here, using a case study in Japan, we applied an approach based onex antelife cycle thinking to guide the future development of the Cl recovery process in terms of the potential energy efficiency and greenhouse gas (GHG) emission. First, energy consumption and GHG emissions associated with current PVC waste treatments were investigated to benchmark the evaluated process. Next, a life cycle inventory (LCI) model containing two variables, dechlorination degreeXandP/K(a variable decided by operating conditions), was developed based on chemical stoichiometry using previous experimental and material flow analysis studies. Using the LCI, the potential net energy consumption and GHG emission of the Cl recovery process based on the investigated variables were obtained. Subsequently, the target thresholds of variable values were deduced by comparing the impacts against the benchmarks. Based on a contribution analysis, although the dechlorination process would be a hotspot for energy consumption, the energy credit could be generated from the reduced Cl treatment for tail gas during thermal processing of PVC wastes and recovered salt. The acceptable variable thresholds can be used to suggest the development target setting for the Cl recovery process at an industrial scale.