污泥有机/无机组分对污泥-PVC共热解氯元素迁移转化影响机制

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摘要为了在城市有机固废共热解过程中实现HCl减排,以市政污泥和含氯塑料(PVC)为研究对象,系统研究污泥有机/无机矿物组分对氯迁移路径及空间分布转变的影响机制,并通过建立神经网络模型确定了污泥各组分对共热解氯固化率的相对影响.结果表明,污泥与PVC掺混比为3:1时气相氯的排放量从93.29%降低到58.21%,焦油中的氯也由4.82%增加到32.66%,热解焦中氯的保留率从1.89%增加到9.13%;污泥有机组分纤维素、半纤维素、多糖、蛋白质以及无机矿物组分Fe₂O₃主要促进气相氯向液相转化,有机组分木质素与无机组分CaO促进气相氯向固体转移的能力更强.本文所建立的神经网络模型具备一定的准确性和有效性,模型预测的结果表明,污泥总有机组分对气相氯向固相和液相转化的总贡献率达到71.35%;而各单一组分中,无机组分氧化钙对气相氯向固相转化的贡献最大,与实验结果相符.

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关键词 ：城市有机固废, 共热解, 有机/无机组分, 氯元素富集, 机理

Abstract：In order to achieve the reduction of HCl emissions, the migration and spatial distribution of chlorine with organic and inorganic components in sludge during co-pyrolysis with urban organic solid waste was investigated. The representative organic/inorganic components of sludge and PVC were selected for the co-pyrolysis experiments, and the contribution of different sludge components on chlorine solidification during co-pyrolysis were determined through a neural network model. The results showed that the emission of gaseous chlorine decreased from 93.29% to 58.21%, the chlorine in tar also increased from 4.82% to 32.66%, and the chlorine remains in pyrolysis coke increased from 1.89% to 9.13% with the mixing ratio of sludge and PVC of 3:1. Cellulose, hemicellulose, polysaccharide, protein, and Fe₂O₃ in inorganic mineral components of sludge mainly promoted the transformation of gaseous chlorine to liquid phase, while lignin and CaO further promoted the transfer of gaseous chlorine to the solid phase. The established neural network model showed that the contribution of the main organic components accounts for 71.35%, and among each component, calcium oxide, in consistent with the experimental results, has the greatest contribution to the chlorine curing rate.

Key words： urban organic solid waste co-pyrolysis organic/inorganic components chlorine enrichment mechanism

收稿日期: 2023-05-08

PACS:

X703.5

基金资助:国家重点研发计划(2020YFC1908703);安徽省自然科学基金项目(2008085ME161)

通讯作者: 苏明雪,工程师,smx123@mail.ustc.edu.cn E-mail: smx123@mail.ustc.edu.cn

作者简介: 顾春晗(1997-),男,安徽合肥人,工程师,硕士,主要从事固体废弃物资源化利用研究.发表论文2篇.guch@mail.ustc.edu.cn.

引用本文:

顾春晗, 苏明雪, 李宁, 朱兵. 污泥有机/无机组分对污泥-PVC共热解氯元素迁移转化影响机制[J]. 中国环境科学, 2023, 43(12): 6386-6392. GU Chun-han, SU Ming-xue, LI Ning, ZHU Bing. The influencing mechanism of organic/inorganic components of sludge on chloride migration and transformation during sludge-PVC co-pyrolysis. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6386-6392.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I12/6386

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