Study on sulfur migration in activated carbon adsorption-desorption cycle: Effect of alkali/alkaline earth metals  

作　　者：Jun Li Liqiang Zhang Tao Wang Jingcai Chang Zhanlong Song Chunyuan Ma 

机构地区：[1]National Engineering Laboratory for Reducing Emissions from Coal Combustion,Engineering Research Center of Eruironmental Thermal Technology of Ministry of Education,Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization,School of Energy and Power Engineering,Shandong University,Jinan 250061,China [2]School of Environmental Science and Engineering,Shandong University,Qingdao 266237,China

出　　处：《Journal of Environmental Sciences》2021年第1期119-129,共11页环境科学学报（英文版）

基　　金：the National Key R&D Program of China(No.2017YFB0602901)。

摘　　要：Activated carbon(AC)has been widely used in the removal of SO_(2) from flue gas owing to its well-developed pore structure and abundant functional groups.Herein,the effect of alkali/alkaline earth metals on sulfur migration was investigated based on the dynamic adsorption and temperature programmed desorption experiment.The adsorption and desorption properties of six types of AC(three commercial and three laboratory-made)were carried out on a fixed-bed experimental device,and the physical and chemical properties of samples were determined by X-ray fluorescence,X-ray diffraction,scanning electron microscopy/energy dispersive X-ray,and X-ray photoelectron spectroscopy analysis.The experimental results showed that the adsorbed SO_(2) cannot be completely desorbed by increasing the regeneration temperature(350-850℃),while the SO_(2) fixed in the AC combines with the Ca-based minerals in the ash to form a stable sulfate.For different samples,higher ash content,higher CaO content in the ash and a more developed pore structure lead to a higher SO_(2) fixation rate.Moreover,the multiple adsorption-desorption cycles experiment showed that the effect of SO_(2) fixation is mainly reflected in the first cycle,after which the adsorption and desorption amount are approximately the same.This study elucidates the effect of alkali/alkaline earth metals on the adsorption-desorption cycle of AC,which provides a deeper understanding of sulfur migration in the AC flue gas desulfurization process.

关 键 词：Activated carbon Alkali/alkaline earth metals Sulfur migration Adsorption-desorption cycle So2 fixation 

分 类 号：X701[环境科学与工程—环境工程]