金属硫化物纳米材料上汞的吸附固定机制及稳定性研究

项目名称： 金属硫化物纳米材料上汞的吸附固定机制及稳定性研究

项目编号： No.51476189

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 李海龙

作者单位： 中南大学

项目金额： 83万元

中文摘要： 燃煤汞污染及其防治近年来引起了国际社会的高度关注。随着《水俣公约》的生效，我国面临着保护环境与履行国际汞公约的双重压力，亟待加强燃煤汞污染防治工作。利用非炭基吸附剂，在颗粒物控制设备前将单质汞高效转化成颗粒态汞，在控制颗粒物排放的同时实现汞的高效、协同脱除，是一种极具竞争力的燃煤汞污染控制方法。本项目针对传统研究对金属硫化物非炭基吸附材料烟气脱汞认识的偏差和不足，首次提出采用高比表面积金属硫化物纳米材料进行烟气脱汞的新思路；采用箱体实验、固定床实验以及喷射实验，系统研究金属硫化物纳米材料脱汞的特性和规律；综合量子化学密度泛函理论、吸附动力学理论以及计算流体力学理论，定量描述金属硫化物纳米材料上汞吸附、固定的全过程；开发金属硫化物纳米材料烟气脱汞新技术，并评价后续飞灰资源化利用或安全处置过程中汞的稳定性；以期为我国防治大气汞污染和履行国际汞公约提供科学依据与技术支撑。

中文关键词： 燃煤烟气；汞；吸附；硫化物；稳定性

英文摘要： More and more concerns about mercury emission from coal combustion and its control have been risen in recent years. With the Minamata Convention on Mercury taking effect, Chinese government is under doulble pressure of environmental protection and fulfilling obligations under the international convention. It is urgent to control mercury emission from coal combustion. Immobilization of coal combustion emitted mercruy on non-carbon sorbent as particulate mercury and removing it simultaneously with particulate matters using existing particulate matter control devices is regarded as a highly competitive method for mercury emission control. In consideration of the shortages in conventional studies related to mercury removal by metal sulfide non-carbon materials, a brand new idea of using nano-scale metal sulfides with large surface area for mercury removal from coal combustion flue gas is proposed for the first time. Chamber, fix bed and adsorbent injection experiments will be conducted to study the characteristics and trends involved in mercury removal over the metal sulfide nano adsorbents. The density functional theory, adsorption dynamics, and computational fluid mechanics will be used to quantitatively describe the entire mercury adsorption and immobilization processes on the metal sulfide nano adsorbents. Mercury stability in the subsequent fly ash recycling and/or fly ash storage processes will also be evaluated. The ultimate goal is to develop a new technology for removing mercury from coal combustion flue gas using metal sulfide nono materials, and to clarify the involved mechanisms.

英文关键词： Coal Combustion Flue Gas;Mercury;Adsorption;Sulfide;Stability