Si/Al基质作用下NaCl高温氯化PbO的机制

doi:10.11949/j.issn.0438-1157.20180206

化工学报 ›› 2018, Vol. 69 ›› Issue (9): 3993-4000.DOI: 10.11949/j.issn.0438-1157.20180206

Si/Al基质作用下NaCl高温氯化PbO的机制

王昕晔¹, 杜荣¹, 张程文¹, 赵志远¹, 张居兵¹, 卜昌盛¹, 黄亚继², 张文³

1. 南京师范大学能源与机械工程学院, 江苏省物质循环与污染控制重点实验室, 江苏南京 210042;
2. 东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室, 江苏南京 210096;
3. 南京上元工业气体厂, 江苏南京 211100

收稿日期:2018-02-23 修回日期:2018-04-28 出版日期:2018-09-05 发布日期:2018-09-05
通讯作者: 王昕晔
基金资助:
国家自然科学基金项目（51706106，51676040）；中国博士后科学基金项目（2017M621778）；安徽省科技重大专项计划项目（15czz02045）。

High temperature chlorination of PbO by NaCl and Si/Al matrix

WANG Xinye¹, DU Rong¹, ZHANG Chengwen¹, ZHAO Zhiyuan¹, ZHANG Jubing¹, BU Changsheng¹, HUANG Yaji², ZHANG Wen³

1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China;
2. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China;
3. Nanjing Shangyuan Industrial Gas Plant, Nanjing 211100, Jiangsu, China

Received:2018-02-23 Revised:2018-04-28 Online:2018-09-05 Published:2018-09-05
Supported by:
supported by the National Natural Science Foundation of China (51706106, 51676040), the China Postdoctoral Science Foundation (2017M621778) and the Science and Technology Major Project of Anhui Province (15czz02045).

摘要/Abstract

摘要：

垃圾焚烧过程中，在灰中Si/Al基质的作用，NaCl可以将不易挥发的PbO转化为易挥发的PbCl₂，从而显著增加烟气中的Pb排放。使用管式炉加热NaCl/Si/Al基质/PbO反应物体系，通过分析升温过程Cl和Pb的释放过程，从间接氯化和直接氯化角度，探索了高温氯化规律与机制。试验发现，间接氯化时氧气中有水蒸气比无水蒸气更有利于反应，Al₂O₃比SiO₂更有利于反应，初始氯化温度通常为700~800℃，NaCl以气态形式参与反应；通过SiO₂直接氯化时，约500℃时PbO与SiO₂反应生成硅酸盐，然后与NaCl蒸气反应，初始氯化温度约650℃；通过Al₂O₃直接氯化时，700~800℃时PbO与Al₂O₃反应生成铝酸盐，然后与NaCl蒸气反应；向SiO₂中添加Al₂O₃会阻碍PbO与SiO₂的反应，氯释放特征由SiO₂基质型向Al₂O₃基质型转变，初始氯化温度升高至700~800℃。

关键词: 垃圾焚烧, 氯化钠, 铅, 氯化, 硅铝

Abstract:

During waste incineration, PbO (difficult to volatilize) can be chlorinated to PbCl₂ (easy to volatilize) by the interaction of NaCl and Si/Al in ash at high temperature. The mechanisms of this transformation were investigated by analyzing the release of chlorine and lead in the view of indirect and direct chlorination during the tube furnace incineration at rising temperature. During the indirect chlorination initialized at 700-800℃, oxygen containing water vapor was found more favorable to reaction than oxygen without water vapor, while Al₂O₃ was more favorable than SiO₂. NaCl was found as vapor to participate indirect chlorination. During the direct chlorination through SiO₂, PbO reacted with SiO₂ first to form silicate at about 500℃, and then reacted with NaCl vapor produced initially at about 650℃. During the direct chlorination through Al₂O₃, PbO reacted with Al₂O₃ first to form aluminate at 700-800℃, and then reacted with NaCl. When Al₂O₃ was mixed with SiO₂, the direct chlorination properties turned from SiO₂ matrix type to Al₂O₃ matrix type, and the initial chlorination temperature increased from about 650℃ to 700-800℃.

Key words: waste incineration, sodium chloride, lead, chlorination, silicon and aluminium

中图分类号:

TK16

王昕晔, 杜荣, 张程文, 赵志远, 张居兵, 卜昌盛, 黄亚继, 张文. Si/Al基质作用下NaCl高温氯化PbO的机制[J]. 化工学报, 2018, 69(9): 3993-4000.

WANG Xinye, DU Rong, ZHANG Chengwen, ZHAO Zhiyuan, ZHANG Jubing, BU Changsheng, HUANG Yaji, ZHANG Wen. High temperature chlorination of PbO by NaCl and Si/Al matrix[J]. CIESC Journal, 2018, 69(9): 3993-4000.

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Si/Al基质作用下NaCl高温氯化PbO的机制

High temperature chlorination of PbO by NaCl and Si/Al matrix

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