活性焦汞吸附性能实验研究Experimental Study on Mercury Absorption Performance of Activated Coke
华晓宇,周劲松,骆仲泱,岑可法
HUA Xiaoyu,ZHOU Jingsong,LUO Zhongyang,CEN Kefa
摘要(Abstract)：
由于SO_2/Hg协同脱除具有较高经济性,采用实验室固定床反应器研究了120℃时AC(活性焦)在模拟烟气条件下协同脱除SO_2/Hg的性能。通过系统地研究温度及O_2,H_2O,SO_2和Hg浓度对AC吸附Hg效率的影响,发现AC对Hg的吸附能力较低。AC吸附Hg的关键步骤是对HgO的氧化,AC表面吸附态的氧是Hg~0的吸附活性位,表明SO_2/Hg的吸附过程既包括物理吸附也包括化学吸附。AC表面存在着SO_2和Hg的竞争吸附,高浓度的SO_2将会降低Hg的吸附效率。增加烟气中的H_2O将增强汞的吸附效率。
The collaborative SO_2/Hg removal technology is of high economic efficiency. By using fixed bed reactor in laboratory, the paper investigates the collaborative SO_2/Hg removal performance of activated coke(AC) at the temperature of 120 ℃ in a simulated gas condition. Through a systematic research on the impact of temperature, O_2, H_2 O, SO_2 and Hg on mercury absorption of AC, it is found that AC is inferior in mercury absorption. The key step of mercury absorption is the oxidation of Hg~0, and the adsorbed O_2 on AC surface is the active site for Hg~0 oxidation, which indicates that adsorption process of SO_2/Hg is a combination of physisorption and chemisorption. There is competitive adsorption between SO_2 and mercury on the surface of AC, and the high concentration of SO_2 causes low mercury removal efficiency. Increase of H_2 O in flue gas can raise mercury absorption efficiency.
关键词(KeyWords)：
烟气污染物;活性焦;汞吸附
flue gas pollution;active coke;mercury adsorption
基金项目(Foundation):
作者(Author):
华晓宇,周劲松,骆仲泱,岑可法
HUA Xiaoyu,ZHOU Jingsong,LUO Zhongyang,CEN Kefa
DOI: 10.19585/j.zjdl.2016.12.017
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