NH4Cl改性活性炭脱除气态Hg0的特性分析

doi:10.16085/j.issn.1000-6613.2018-0124

化工进展 ›› 2018, Vol. 37 ›› Issue (10): 4068-4073.DOI: 10.16085/j.issn.1000-6613.2018-0124

NH₄Cl改性活性炭脱除气态Hg⁰的特性分析

周强^1,2, 段钰锋², 冒咏秋^2,3, 朱纯²

1 南京师范大学能源与机械工程学院, 江苏省能源系统过程转化与减排技术工程实验室, 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 中国质量认证中心南京分中心, 江苏南京 210005

收稿日期:2018-01-15 修回日期:2018-03-24 出版日期:2018-10-05 发布日期:2018-10-05
通讯作者: 周强(1988-),男,博士,讲师。
作者简介:周强(1988-),男,博士,讲师。E-mail:zhouqiang8@njnu.edu.cn。
基金资助:
国家自然科学基金（51676041）、江苏省高校自然科学基金（17KJD470003）及中国博士后科学基金（2017M621780）项目。

Gaseous Hg⁰ removal by NH₄Cl modified activated carbon

ZHOU Qiang^1,2, DUAN Yufeng², MAO Yongqiu^2,3, ZHU Chun²

1 Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China;
2 Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China;
3 Nanjing Branch of China Quality Certification Centre, Nanjing 210005, Jiangsu, China

Received:2018-01-15 Revised:2018-03-24 Online:2018-10-05 Published:2018-10-05

摘要/Abstract

摘要： 制备了原始活性炭与NH₄Cl改性活性炭，对其进行了物化特性表征，在固定床汞吸附实验台上考察了N₂气氛下颗粒粒径、NH₄Cl溶液浓度、SO₂、CO₂等因素对活性炭脱除Hg⁰性能的影响。研究结果表明：NH₄Cl浸渍改性没有造成活性炭孔隙结构的明显变化，但使得Cl元素成功担载到活性炭表面；随着颗粒粒径增大，活性炭吸附Hg⁰的外部传质速率、内部扩散速率均降低，较小的颗粒粒径有利于活性炭脱汞；由NH₄Cl改性在活性炭表面所产生的卤素官能团（AC-Cl）能够有效地氧化烟气中的Hg⁰，增强了活性炭对于Hg⁰的氧化吸附作用；SO₂能有限地促进原始活性炭的脱汞性能，对NH₄Cl改性活性炭脱汞性能则表现出先促进后抑制并主要体现抑制作用的现象，并且抑制作用随SO₂浓度的增大而增加；CO₂由于能在活性炭表面极化，且能与氨基官能团反应生成有利于吸附汞的羰基，促进了活性炭的脱汞性能。

关键词: 氯化铵, 活性炭, 固定床, 烟道气, 脱汞

Abstract: A raw activated carbon and NH₄Cl modified activated carbon were prepared and characterized. Gas-phase Hg⁰ removal performance of the sorbent samples were evaluated in a fixed-bed reactor under N₂ atmosphere. Effect of sorbent size, NH₄Cl solution concentration, SO₂, and CO₂ on mercury removal was explored. The results showed that the porous structure of raw activated carbon does not change during NH₄Cl modification process, but some Cl-containing group remains on activated carbon surface. With the increase of sorbent size, the external mass transfer coefficient and the internal diffusion rate decreases, which indicate that smaller particle size is beneficial to improve mercury removal performance of activated carbon. Due to the generated Cl-containing functional groups can oxidize gaseous Hg⁰ effectively, the oxidation adsorption capability of NH₄Cl-impregnated activated carbon is enhanced. SO₂ in flue gas promotes mercury removal of raw activated carbon, but for NH₄Cl modified activated carbon, SO₂ first promotes mercury removal then inhibits. The inhibition on mercury removal by SO₂ was increased with the concentration of SO₂. Due to the polarization on the surface of activated carbon and the reaction with amino functional groups to form carbonyl groups, CO₂ in flue gas improves mercury removal capability of activated carbon.

Key words: ammonium chloride, activated carbon, fixed-bed, flue gas, mercury removal

中图分类号:

X511

周强, 段钰锋, 冒咏秋, 朱纯. NH₄Cl改性活性炭脱除气态Hg⁰的特性分析[J]. 化工进展, 2018, 37(10): 4068-4073.

ZHOU Qiang, DUAN Yufeng, MAO Yongqiu, ZHU Chun. Gaseous Hg⁰ removal by NH₄Cl modified activated carbon[J]. Chemical Industry and Engineering Progress, 2018, 37(10): 4068-4073.

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NH₄Cl改性活性炭脱除气态Hg⁰的特性分析

Gaseous Hg⁰ removal by NH₄Cl modified activated carbon

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