中国电机工程学报Issue(2)：272-278,7.DOI:10.13334/j.0258-8013.pcsee.2014.02.009
城市生活垃圾焚烧中NaCl迁移转化的实验和热力学平衡分析
Experimental and Thermodynamic Investigation on Partitioning and Speciation of NaCl During Municipal Solid Waste Incineration
摘要
Abstract
In order to investigate the partitioning and speciation of NaCl during municipal solid waste (MSW) incineration the artificial waste was experimentally burned in a quartz tube furnace. The scanning electron microscope-energy dispersive X-ray (SEM-EDS) analysis and thermodynamic equilibrium calculation were performed to study morphological transformation of chlorine. The factors include temperature, retention time, moisture in the flue gas and sulfur content on the NaCl partitioning. The results showed that temperature can promote the NaCl evaporation and decomposition, thus can increase chlorine distribution in fly ash and flue gas. After burning 12 min at 1 000℃ NaCl migration distribution tends to be stable in the experiments. The SEM-EDS results show that NaCl irregularly exists at the surface of slag substrate as the temperature is 800℃; and as the temperature is 1 000℃the chloride diffuse in the bottom slag, forming the half ball dislocation structure, while the chlorine forms the submicron fly ash in the fine structure of the nucleus of condensation. Thermodynamic equilibrium calculation show that the acidic oxides, Al2O3 and SiO2, have a strong affinity with Na, they can promote the oxidative decomposition of NaCl to generate HCl. The evident effect of moisture in flue gas on the NaCl partition-ing is not observed, as a result, hydrolysis reaction is too difficult to occur. The SO2 and SO3 in the flue gas can react with NaCl to generate Na2SO4, thus promotes its decomposi-tion, and with the decreasing temperature the effect of pro-moting is more obvious.关键词
城市生活垃圾焚烧/NaCl/迁移分布/化学形态/热力学平衡计算Key words
municipal solid waste (MSW) incineration/sodium chloride/partitioning/speciation/thermodynamic equilibrium calculation分类
资源环境引用本文复制引用
孙进,李清海,李国岫,蒙爱红,张衍国..城市生活垃圾焚烧中NaCl迁移转化的实验和热力学平衡分析[J].中国电机工程学报,2014,(2):272-278,7.基金项目
国家重点基础研究发展计划项目(973项目)(2011CB201502)；“十一五”国家科技支撑计划重大项目(2010BAC66B03)。The National Basic Research Program of China (973 Program)(2011CB201502) （973项目）
Key Project of the National Eleventh-Five Year Research Program of China (2010BAC66B03) （2010BAC66B03）
