Development and evaluation of magnetic iron-carbon sorbents for mercury removal in coal combustion flue gas
Development and evaluation of magnetic iron-carbon sorbents for mercury removal in coal combustion flue gas
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DOI：
10.1016/j.joei.2020.01.023
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发表时间：
2020-08-01
影响因子：
5.7
通讯作者：
Wu, Fan
中科院分区：
文献类型：
--
作者：
Chen, Yu;Guo, Xin;Wu, Fan
为了获得一种经济、可循环使用的除汞吸附剂，采用共沉淀法制备了一系列磁性铁碳（Fe-C-x）吸附剂。通过各种表征方法对所得吸附剂的物理和化学性质进行了评价。结果表明，Fe 3 O 4在活性炭表面的沉淀削弱了活性炭的表面性质，但在模拟烟气中的除汞性能良好。对于烟气组分，HCl促进了汞在吸附剂上的氧化和吸附，O-2对汞的去除作用有限，SO2起抑制作用。NO能促进O-2存在下Hg-0的氧化，这是由于NO在铁碳表面生成NO2，并与Hg-0发生非均相反应。此外，在模拟烟气条件下，进一步研究了温度和再生性能的影响。除了较高的温度会使汞化合物分解而导致去除效率下降外，Fe-C-3吸附剂在100-200 ℃的温度窗口内表现出优异的Hg-0去除性能。对Hg-0吸附剂的再生性能表明，吸附剂可以再生。(C)2020能源研究所由爱思唯尔有限公司出版。保留所有权利。
In order to get a cost effective and recyclable sorbent for mercury removal, a series of magnetic ironcarbon (Fe-C-x) sorbents was developed by co-precipitation. The physical and chemical properties of obtained sorbents were evaluated through various characterization methods. According to the results, Fe3O4 precipitate on carbon weakens the surface properties, but mercury removal performance in simulated flue gas is excellent. For flue gas components, HCI promotes mercury oxidation and adsorption on sorbents, O-2 has limited effect on mercury removal and SO2 plays an inhibitive role. NO could enhance mercury oxidation with O-2 existence because of the generation of NO2 , which could react with Hg-0 through heterogeneous reaction over iron-carbon surface. Besides, effects of temperature and regeneration performance were further researched under simulated flue gas. Apart from higher temperature will decompose mercury compounds and cause the removal efficiency decrease, Fe-C-3 sorbent shows excellent Hg-0 removal performance at the temperature window of 100-200 degrees C. Exceptional regeneration performance on Hg-0 removal indicates that spent sorbent could be regenerated. (C) 2020 Energy Institute. Published by Elsevier Ltd. All rights reserved.