Performance and kinetics of mercury adsorption over Tai-Xi activated coke

doi:10.3969/j.issn.0438-1157.2013.03.041

Abstract

Abstract: The tests of mercury adsorption on Tai-Xi activated coke were conducted in an adsorption system of fixed-bed reactor.The effect of inlet mercury concentration and temperature on adsorption efficiency(removal of mercury)was studied using a simulated flue gas that was prepared by mixing flue gas component CO₂,N₂,O₂,NO and Hg⁰ vapors came from a permeation tube.The results show that there is similar shape of adsorption curve for different initial mercury concentrations and efficiency of mercury removal increases with increase of inlet mercury concentration.The initial port of breakthrough curve shows that the adsorption rate is rapid,then slow and slow until to adsorption saturation.The uptake process of mercury by activated coke can be well fitted by a pseudo-second order kinetics model,indicating that for CO₂/N₂/O₂/NO/Hg⁰ system,the adsorption of mercury on the activated coke takes mainly place by chemical adsorption or chemical reaction.The optimal temperature is 423 K for the best mercury removal.The Bangham equation can be applied to describe the adsorption behavior at different operation temperature,and the adsorption rate constants at different temperature follow as k_423K>k_463K>k_403K.

Key words: activated coke, temperature, inlet concentration of Hg⁰, adsorption mechanism, mercury removal

摘要： 通过固态吸附剂汞吸附效能测定系统进行了太西活性焦吸附单质汞的实验,考察单质汞Hg⁰入口浓度和温度对太西活性焦脱汞性能的影响并探讨了吸附机理。结果表明:在CO₂/N₂/O₂/NO/Hg⁰体系中,不同Hg⁰入口浓度获得的汞脱除效率曲线相似,脱除效率随Hg⁰入口浓度增大而增加;变入口浓度工况下,汞的吸附全过程遵循准二级动力学反应模型,该吸附过程以化学吸附为主;在反应温度从403 K升高到423 K的过程中,系统发生了化学吸附或者化学反应,423 K可作为活性焦的最佳除汞温度;Bangham方程可对变温工况下活性焦脱除单质汞的吸附过程进行准确描述,并获得不同温度下活性焦脱汞的吸附速率常数存在k_423K>k_463K>k_403K的关系。

关键词: 活性焦, 温度, 单质汞入口浓度, 吸附机理, 除汞

CLC Number:

X701.7

ZHANG Hairu, WU Hao, LIU Hao, WANG Meng, YANG Hongmin. Performance and kinetics of mercury adsorption over Tai-Xi activated coke[J]. CIESC Journal, 2013, 64(3): 1076-1083.

张海茹, 吴昊, 刘浩, 王萌, 杨宏旻. 活性焦汞吸附特性及动力学机理分析[J]. 化工学报, 2013, 64(3): 1076-1083.

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