可循环再生吸附剂脱汞技术现状及发展趋势

Review of regenerable sorbents for mercury removal from coal-fired flue gas

总结了当前燃煤烟气脱汞常用的协同脱汞技术和贵金属、金属氧化物基可再生吸附剂技术发展现状,分析了各方法的优势与存在的问题,对未来磁性可回收吸附剂的发展方向和趋势进行了展望。针对现有脱汞技术效率低、易造成二次污染等缺陷,提出了使用飞灰磁珠制备廉价可回收脱汞吸附剂的新思路。通过大量试验开发了负载Co_3O_4或CuCl_2的磁珠改性方法以增强脱汞能力和抗烟气组分干扰能力,从而能够适用于低氯复杂烟气气氛。设计了改性磁珠吸附剂喷射脱汞工艺流程,可兼顾高效脱汞与低廉的运行成本,并通过磁珠回收再利用彻底避免汞进入环境造成污染。

Briefly reviewing the synergic mercury removal technology and regenerable sorbents for mercury removal from coal-fired flue gas especially those loaded with noble metals and metal oxides,the advantages and disadvantages were analyzed.A outlook of magnetic recyclable sorbents was given.A new idea that using magnetospheres from fly ash as recyclable sorbent was proposed to avoid the application limitations of the conventional mercury control technologies.The optimized method to produce Co3O4/CuCl2 modified sorbent was investigated to improve the mercury removal efficiency and resistance of complicated flue gas with low HCl content. Finally,a feasible technological process for the application of magnetospheres was proposed. This process can achieve high efficiency mercury removal with low cost to avoid mercury pollution of environment.