燃煤飞灰对烟气中汞的吸附转化特性研究  

Study on the Absorption and Transformation Characteristics of the Coal-combustion Fly Ash on the Flue Gas Mercury

作　　者：姜未汀[1] 吴江[1] 任建兴[1] 潘卫国[1] 潘雷[1] 王鹏[1] 张锦红[1] 

机构地区：[1]上海电力学院能源与环境工程学院,上海200090

出　　处：《华东电力》2011年第7期1159-1162,共4页East China Electric Power

基　　金：国家自然科学基金项目(50806041);上海市"曙光计划"项目(08SG53);上海市教委科研创新重点项目(09ZZ184);上海市教委重点学科建设项目(J51304);上海市地方能力建设项目(09230501300)~~

摘　　要：采用氯化钠、氧化钙及其混合物对某电厂燃煤飞灰进行浸渍改性,运用比表面积和孔径测定仪、扫描电镜(SEM)、射线衍射仪(XRD)对改性前后的飞灰进行了物理表征,在自行开发的吸附剂评价装置进行了烟气汞脱除的实验研究。结果表明,浸渍改性后燃煤飞灰的比表面积明显增大,平均孔径大幅度减小,对烟气汞的捕捉能力明显提高,CaO溶液浸渍的飞灰对汞的脱除效率为35.69%,是飞灰改性前的1.69倍。对CaO和NaCl改性后飞灰吸附烟气汞的效率提高的原因进行了分析。In this paper,sodium chloride,calcium oxide and their mixture are adopted to modify the coal-combustion fly ash.The properties of the original and modified fly ash are characterized with specific surface area and pore size analyzer,scanning electron microscopy（SEM）,and ray diffraction（XRD）.The mercury removal efficiencies of the original and modified fly ash are evaluated on the absorbent evaluation reactor developed by Shanghai University of Electric Power.The results show that specific surface area of the fly ash increases and its pore size decreases after modification,and mercury capturing capability of the fly ash is significantly improved with modification.The mercury removal efficiency of fly ash impregnated with CaO solution is up to 35.69%,which is 1.69 times of that of the unmodified fly ash.The reasons of the mercury removal efficiency by the fly ash being modified by CaO and/or NaCl are analyzed accordingly.

关 键 词：烟气汞 燃煤飞灰 吸附特性 化学改性 

分 类 号：TM621.8[电气工程—电力系统及自动化]