洁净煤技术

2020, v.26;No.127(03) 153-160

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湿法脱硫浆液中汞的再释放及其稳定化研究进展
Research progress on re-release and stabilization of mercury in wet desulfurization slurry

陶君;谷小兵;张帆;段钰锋;
TAO Jun;GU Xiaobing;ZHANG Fan;DUAN Yufeng;Datang Environment Industry Group Co.,Ltd.;School of Energy and Environment,Southeast University;

摘要(Abstract):

重金属汞是燃煤烟气中一种有毒的痕量元素,由于其大气迁移性和生物累积性极易对生态环境和人类健康产生危害,现已成为燃煤烟气四大污染物之一。燃煤电厂现有污染物控制设备(APCDs)协同脱汞技术得到越来越多的研究和应用。湿法烟气脱硫(WFGD)装置已成为脱除烟气中二价汞的重要设备,且具有较高的脱除效率。但是,WFGD装置吸收的Hg2+,在脱硫浆液中还原性离子的作用下被还原为Hg0形态重新释放到烟气中,从而降低了APCDs的协同脱汞效率。笔者综述了湿法脱硫浆液中汞的再释放机理、影响因素、抑制汞再释放的原理以及汞稳定化添加剂的研究进展,详细阐述了烟气氧含量、脱硫浆液温度、浆液p H值、液气比等脱硫系统运行参数以及浆液中SO23-、Cl-、Ca2+等共存离子对汞再释放特性的影响规律;论述了抑制脱硫浆液中汞再释放添加剂的分类、特性以及常用添加剂与Hg2+相互作用的化学反应机理和影响因素;概述了近年来国内外学者对汞稳定化添加剂的最新研究成果,典型有效的添加剂有H2S、无机硫化物、卤化物、Fenton试剂以及有机硫螯合剂二硫代氨基甲酸盐(DTC)、三巯基均三嗪三钠盐(TMT)、三硫代碳酸钠(STC)等。同时分析了不同添加剂的特性、使用条件、汞稳定化效果及其优缺点;概述了现有试验研究存在的问题并提出完善化发展方向,为进一步抑制脱硫浆液中汞的再释放和汞稳定化添加剂的研究与应用提供参考。
Heavy metal mercury is a toxic trace element in coal-fired flue gas. Due to the atmospheric mobility and bioaccumulation,it is very easy to cause harm to ecosystems and human health. So heavy metal mercury has become one of the four major pollutants from coalfired flue gas. The synergistic mercury removal techniques by utilizing the conventional air pollution control devices( APCDs) has been increasingly studied in coal-fired power plants. The wet flue gas desulfurization( WFGD) device has become an important equipment for the removal of divalent mercury in flue gas with higher efficiency. However,the Hg2+absorbed by the WFGD device is released into the flue gas in the form of Hg0 under the action of reducing ions in the desulfurization slurry,which reduces the overall synergistic mercury removal efficiency of the APCDs. In this paper,the mechanism of mercury re-release in wet desulfurization slurry,the influencing factors,the principle of inhibiting mercury re-release and the research progress of mercury stabilizing additives were summarized. The effect of the desulfurization system operating parameters such as flue gas oxygen content,desulfurization slurry temperature,slurry p H,liquid-gas ratio,etc.,and coexisting ions such as SO23-,Cl-and Ca2+etc. on the mercury re-release behavior was elaborated; the classification and characteristics of additives that inhibit mercury re-release in the desulfurization slurry,as well as the chemical reaction mechanism and influencing factors of the interaction between the common additives and Hg2+was discussed; the latest research results of the mercury stabilizing additives by domestic and foreign scholars in recent years were summarized,such as the typical ones like H2 S,inorganic sulfides,halides,Fenton reagents and organic sulfur chelating agents DTC,TMT and STC etc. At the same time,The features of different additives,utilization condition,effects of mercury stabilization,and merits and drawbacks of them were analyzed. Some questions in the ongoing experimental research were surveyed and the directions for future improvement were proposed. It provides a reference for research and development on mercury re-release inhibition and mercury stabilizing additives in WFGD slurry.

关键词(KeyWords): 湿法脱硫;脱硫浆液;汞再释放;添加剂;汞稳定化
wet desulfurization;desulfurization slurry;mercury re-release;additive;mercury stabilization

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2016YFB0600203)

作者(Author): 陶君;谷小兵;张帆;段钰锋;
TAO Jun;GU Xiaobing;ZHANG Fan;DUAN Yufeng;Datang Environment Industry Group Co.,Ltd.;School of Energy and Environment,Southeast University;

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DOI: 10.13226/j.issn.1006-6772.20030701

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