城市生活垃圾焚烧中铅形态转化的热力学平衡

发布时间：2018-01-13 13:33

本文关键词：城市生活垃圾焚烧中铅形态转化的热力学平衡　出处：《中南大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：采用热力学平衡计算方法,研究城市生活垃圾焚烧过程中焚烧温度、S,Cl以及空气过量系数等影响因素间的交互作用对Pb的形态转化的影响,并考察不同焚烧工况下,CaO和SiO_2对焚烧中Pb的吸附效果。研究结果表明:不同焚烧气氛下S和Cl对焚烧中Pb的形态转化特性影响较大;在氧化性气氛下,S可抑制焚烧中Pb的挥发,Cl可促进Pb的挥发;在还原性气氛下,S和Cl均能较好地促进Pb的挥发。焚烧中S与Pb的亲和性比Cl与Pb的亲和性强;Na与S,Cl的亲和性比Pb的好,Na在一定程度上抑制了S和Cl对Pb作用。CaO对Pb的吸附效果较差,但可有效地减弱S和Cl对Pb的影响;SiO_2可在较大的温度范围内有效吸附焚烧中的Pb,垃圾中的Cl会降低SiO_2的吸附效果,S对SiO_2的吸附效果影响不大。
[Abstract]:The thermodynamic equilibrium calculation method was used to study the interaction between the combustion temperature and the air excess coefficient in the incineration process of municipal solid waste (MSW). The adsorption effects of Cao and SiO_2 on Pb in incineration under different incineration conditions were investigated. The results showed that S and Cl had a great influence on the speciation transformation of Pb in incineration under different incineration atmospheres. In the oxidizing atmosphere, the volatilization of Pb and Cl can be inhibited, and the volatilization of Pb can be promoted. Both S and Cl can promote the volatilization of Pb in reductive atmosphere. The affinity between S and Pb in incineration is stronger than that between Cl and Pb. The affinity of Na to SfCl is better than that of Pb. To a certain extent, Na can inhibit the adsorption of Pb by S and Cl, but it can weaken the effect of S and Cl on Pb. SiO_2 can effectively adsorb Pb in incineration in a large temperature range, and Cl in garbage can reduce the adsorption effect of SiO_2. S has little effect on the adsorption of SiO_2.
【作者单位】：东南大学能源热转换及其过程测控教育部重点实验室;中国电力工程顾问集团华北电力设计院有限公司;
【基金】：国家自然科学基金资助项目(51476031) 高等学校博士学科点专项科研基金资助项目(20130092110007)~~
【分类号】：X799.3
【正文快照】： 垃圾焚烧是一种能够实现垃圾的减量化、无害化和资源化的有效方法,但因技术、运行的不足使垃圾焚烧不可避免地产生二次污染,特别是其中的重金属污染,已成为目前垃圾焚烧环保方面的研究热点。在垃圾焚烧过程中,重金属会发生迁移转化形成重金属及其化合物蒸气,且部分蒸气会与亚

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