椰壳碳基吸附剂的脱汞特性  

Removal of elemental mercury by coconut shell carbon

作　　者：谭增强[1] 牛国平[1] 陈晓文 安振[1] 

机构地区：[1]西安热工研究院有限公司,西安710032 [2]青海黄河上游水电开发有限公司西宁发电分公司,西宁810007

出　　处：《环境工程学报》2015年第12期5992-5996,共5页Chinese Journal of Environmental Engineering

基　　金：中国博士后科学基金面上项目资助(2013M542373);华能集团总部科技项目资助(HNKJ14-H10)

摘　　要：为研究来源于生物质的椰壳活性炭对单质汞的脱除性能,采用化学浸渍法对椰壳活性炭进行化学改性处理,并在小型实验台架上考察了椰壳碳基吸附剂的脱汞性能。并对改性前后的样品进行了BET和SEM表征分析以研究改性前后椰壳活性炭的变化规律。结果表明,改性后椰壳活性炭具有较强的脱汞能力,特别是在140℃、180℃时的脱汞效率仍保持在95%以上。改性后椰壳活性炭具有更多的利于脱汞的官能团,其主要靠化学吸附脱汞。烟气中低浓度的SO_2与NO对汞的脱除有一定的抑制作用,而HCl有一定的促进作用。To study the elemental mercury removal performance of coconut shell carbon（ YC） from renewable bioresource,chemical impregnation method was used to modify coconut shell carbon. The YC and modified YC were investigated with bench-scale fixed-bed reactor. BET and SEM analysis were used to determine the properties of the sorbents. The characterization of sorbents in relation to Hg-0 adsorption capacity provided important information on the Hg-0 adsorption mechanism. This suggested that the modified YCs have excellent adsorption potential for elemental mercury at a relatively higher temperature of 140℃ and 180℃,the mercury removal efficiency could reach up to 95%. The impregnation increased the sorbents＇ active sites for mercury adsorption,and chemical-adsorption dominated mechanism was found. SO_2 and NO could inhibit the mercury removal,but HCl could promote the sorbents＇ mercury removal performance.

关 键 词：汞 椰壳活性炭 改性 机理 

分 类 号：O643[理学—物理化学]