电力科技与环保2025，Vol.41Issue(5)：691-701,11.DOI:10.19944/j.eptep.1674-8069.2025.05.001
机械化学改性粉煤灰脱汞性能研究
Research on mercury removal performance of mechanochemically modified fly ash
摘要
Abstract
[Objective]Driven by the national"carbon peaking and carbon neutrality goals"strategy goal,environmental pollution and ecological damage caused by the combustion of traditional fossil energy,especially heavy metal pollution,are gaining more attention.Coal-fired power plants are one of the main sources of heavy metal mercury pollution,so it's vital to develop efficient and economical mercury removal adsorbents.However,elemental mercury in coa-fired flue gas is hard to remove,and traditional adsorbents are costly and inefficient.[Methods]This study prepared a mercury removal adsorbent from fly ash via a mechanochemical method with modifiers.The effects of ball-milling time,speed,temperature,and modifier parameters on mercury removal were explored using a fixed-bed reactor.[Results]The experimental results show that raw fly ash has poor mercury removal effect,with low mercury removal rate and limited adsorption capacity,which cannot meet the demand for efficient mercury removal.After mechanochemical coupling and bromine modification,the mercury removal efficiency of fly ash is significantly improved.Properly extending the ball-milling time and speed reduces the particle size of modified fly ash and increases specific surface area,which facilitates the contact between mercury and adsorption sites,thereby improving mercury removal efficiency.Higher reaction temperatures are beneficial for mercury diffusion on the adsorbent surface.Between 100℃and 350℃,mercury breakthrough rate progressively decreased from 63.95%to 9.49%,while specific cumulative mercury adsorption capacity increased from 117.55 μg/g to 226.79 μg/g.NH4Br modification demonstrated superior efficacy compared to NH4Cl.With increasing NH4Br dosage,mercury breakthrough rate decreased from 54.63%to 42.13%,while adsorption capacity rose from 115.18 μg/g to 150.89 μg/g;This is attributed to the combined effects of mechanical ball milling and NH4Br,which generated numerous active functional groups on the fly ash surface while forming covalent C-Br bonds,thereby promoting Hg⁰ adsorption.However,higher addition levels did not significantly enhance the mercury removal performance of the modified fly ash.[Conclusion]This work offers a high-efficiency and low-cost solution for mercury pollution control in coal-fired power plants and provides a reference for related flue gas mercury removal research.关键词
脱汞/粉煤灰/机械化学/汞吸附剂Key words
mercury removal/fly ash/mechanochemical/adsorbent分类
能源科技引用本文复制引用
王剑文,郭力,魏佳豪,刘泰然,王卉..机械化学改性粉煤灰脱汞性能研究[J].电力科技与环保,2025,41(5):691-701,11.基金项目
国家自然科学基金项目(51706104) （51706104）
中央高校基本科研业务费专项资金资助项目(30925010525) （30925010525）
