电力科技与环保2025，Vol.41Issue(5)：748-758,11.DOI:10.19944/j.eptep.1674-8069.2025.05.006
燃煤烟气脱除氯化氢的研究进展
Review on research progress of coal flue gas dichlorination
摘要
Abstract
[Objective]The efficient removal of HCl from coal-fired flue gas is a key challenge to achieve ultra-low emission and wastewater reduction.Limestone-gypsum desulfurization is a relatively mature flue gas desulfurization process at present,but it still faces the problem of large amount of desulfurization wastewater.The amount of desulfurization wastewater mainly depends on the concentration of Cl-in the system.Reducing the concentration of chlorine-containing substances from the source is an effective way to reduce the concentration of Cl-in the desulfurization system and thus reduce the discharge of wastewater.In order to effectively reduce the chloride ion concentration in the desulfurization system and guide the desulfurization operation,further research is needed.[Methods]This paper systematically reviews recent advances in understanding chlorine occurrence forms,migration/transformation mechanisms during coal combustion,and flue gas dechlorination technologies.[Results]Chlorine in coal exists as both inorganic chlorides and organic chlorine compounds,with over 95%converting to gaseous HCl during combustion.Its release characteristics are governed by coal quality,particle size,and temperature regulation.Among existing dechlorination technologies:dry methods offer operational simplicity but limited efficiency.Wet methods achieve over 90%efficiency but encounter challenges in chlorinated wastewater treatment.Semi-dry methods enable efficient dechlorination and zero wastewater discharge through multiphase reactions,yet face technical bottlenecks such as nozzle clogging and operational complexity compared to dry methods.Furthermore,this work examines various dechlorinating agents and their mechanisms,highlighting calcium-based agents as the most widely adopted industrial option due to cost-effectiveness.The dechlorination process primarily involves physical adsorption and chemical reactions,with experimental studies revealing that HCl preferentially undergoes chemical adsorption on sorbent surfaces to form CaClOH/CaCl2.Temperature significantly influences competitive adsorption between HCl and other acid gases,where HCl dominates alkaline sites on sorbents through kinetic advantages.[Conclusion]Future research should focus on developing wide-temperature-range and cost-effective dechlorinating agents,along with synergistic control of multiple pollutants,to advance clean coal flue gas treatment technologies.关键词
燃煤烟气/脱氯技术/脱氯剂/脱氯机理Key words
coal flue gas/dechlorination technology/dechlorination agent/dechlorination mechanism分类
能源科技引用本文复制引用
卢昱辰,周超,郭力,王卉,刘猛..燃煤烟气脱除氯化氢的研究进展[J].电力科技与环保,2025,41(5):748-758,11.基金项目
国家重点研发计划项目(2022YFB4100301) （2022YFB4100301）
