Abstract: The generation of dioxin during recycling of solid waste is widely concerned. An experimental research on gasification of simulation garbage containing-high-PVC was carried out on a special designed integrated experimental platform for fluidized-bed gasification. The effects of PVC content and equivalent air ratio (ER) on feature of dioxins generation were discussed. The results show that when PVC content is 20% and ER decreases from 1.2 to 0.4, the yield and TEQ of dioxin produced per gram of PVC are decreased from 146.53 ng·g^-1 and 20.71 ng I-TEQ·g^-1 to 2.07 ng·g^-1 and 0.31 ng I-TEQ·g^-1, respectively. For the same ER 0.4 and PVC decreased from 20% to 1%, the yield and TEQ of dioxin produced per gram of PVC reduced from 23.54 ng·g^-1 and 3.49 ng I-TEQ·g^-1 to 2.07 ng·g^-1 and 0.31 ng I-TEQ·g^-1. That means that the risk of dioxin generation in gasification of the solid waste increases with PVC content, while low-air equivalent factor can suppress its generation.

Key words: PVC, fluidized-bed, gasification, solid waste, dioxin

摘要： 针对固体废弃物资源化过程中普遍关心的二噁英生成问题，利用自行设计建造的流化床气化综合实验平台对高含PVC模拟垃圾进行了流化床气化实验，讨论了PVC含量、空气计量系数对二噁英生成特性的影响规律。结果显示，对于PVC含量为20%的模拟垃圾，在空气计量系数由1.2降至0.4时，单位PVC的二噁英生成量和毒性当量分别由146.53 ng·g^-1和20.71 ng I-TEQ·g^-1降至2.07 ng·g^-1和0.31 ng I-TEQ·g^-1；在空气计量系数同为0.4时，随着PVC含量由20%降至1%，单位PVC的二噁英生成量及其毒性当量由23.54 ng·g^-1和3.49 ng I-TEQ·g^-1降至2.07 ng·g^-1和0.31 ng I-TEQ·g^-1。因此，在固废处理过程中，二噁英的生成风险随着PVC含量的增加而增加，而气化和低空气计量系数有利于抑制二噁英的生成。

关键词: PVC, 流化床, 气化, 固体废弃物, 二噁英