电力科技与环保2025，Vol.41Issue(5)：716-726,11.DOI:10.19944/j.eptep.1674-8069.2025.05.003
燃煤电厂烟气脱氯技术进展
Advances in flue gas dechlorination technology for coal-fired power plants
摘要
Abstract
[Objective]With the increasingly stringent"zero discharge"policy for power plant wastewater and emission limits on hydrogen chloride(HCl)from coal-fired flue gas,improving the dechlorination efficiency of coal combustion flue gas has become an urgent issue to address.In order to further reveal the effective method of HCl control,it is the current research focus to compare and analyze various technologies and identify their advantages and disadvantages.[Methods]This paper systematically reviews the literature on three categories of dechlorination pathways—pre-combustion,in-combustion,and post-combustion—comprehensively summarising and comparing the fundamental principles,advantages,and disadvantages of each technology.[Results]Research indicates that coal washing achieves a dechlorination efficiency of approximately 27%-56%,effectively removing inorganic chlorine but with limited effectiveness in eliminating organic chlorine in coal.Furthermore,it is costly and cannot meet the dechlorination needs of coal-fired power plants.In-combustion dechlorination depends on the addition of reactants under high-temperature conditions,but strong competitive reactions with acidic gases such as SO2 hinder the selective removal of HCl.In contrast,post-combustion dechlorination technologies show greater application potential,especially due to their compatibility with existing flue gas purification systems,enabling efficient and synergistic pollutant control.Among them,wet dechlorination is a mature technology but leads to wastewater discharge issues.Dry/semi-dry methods feature advantages such as no wastewater generation and minimal impact on boiler efficiency.However,these technologies are constrained by factors including flue gas composition effects,incomplete online detection methods,and degradation of fly ash quality.Currently,domestic dry/semi-dry dechlorination efficiencies are mostly below 70%,lower than the 90%efficiency achieved by the U.S.Environmental Protection Agency using Na2CO₃·NaHCO₃·2H2O dry injection.[Conclusion]Overall,post-combustion dry/semi-dry dechlorination technologies hold great potential in meeting environmental regulations,achieving high dechlorination efficiency,and promoting industrial application.They merit further in-depth research and optimization.关键词
燃煤烟气/烟气脱氯/电厂超低排放/氯化氢/废水减量Key words
coal fired flue gas/flue gas dechlorination/ultra low emissions from power plants/hydrogen chloride/wastewater reduction分类
能源科技引用本文复制引用
邵云霞,王睿,曹嵩山,李昂,刘晓硕..燃煤电厂烟气脱氯技术进展[J].电力科技与环保,2025,41(5):716-726,11.基金项目
国家能源集团基层单位科技创新项目(GNHJ-2023-02) （GNHJ-2023-02）
