化工学报 ›› 2012, Vol. 63 ›› Issue (3): 910-915.DOI: 10.3969/j.issn.0438-1157.2012.03.033

• 能源和环境工程 • 上一篇    下一篇

高含氯固体废弃物流化床气化的二噁英生成特性

郑皎1,2,池涌2,李建新1,王永川1,胡长兴1   

  1. 1浙江大学宁波理工学院能源与环境工程研究所;2浙江大学能源清洁利用国家重点实验室
  • 收稿日期:2011-07-08 出版日期:2012-03-05 发布日期:2012-03-05
  • 通讯作者: 郑皎

Feature of dioxin generation during gasification of solid waste containing high Cl in fluidized-bed

ZHENG Jiao1,2,CHI Yong2,LI Jianxin1,WANG Yongchuan1,HU Changxing1   

  • Received:2011-07-08 Online:2012-03-05 Published:2012-03-05

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

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

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