Role of SO2 for elemental mercury removal from coal combustion flue gas by activated carbon
Role of SO2 for elemental mercury removal from coal combustion flue gas by activated carbon
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DOI：
10.1021/ef800134t
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发表时间：
2008-06
期刊：
影响因子：
5.3
通讯作者：
Azhar Uddin;Toru Yamada;Ryota Ochiai;E. Sasaoka;Shengji Wu
中科院分区：
文献类型：
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作者：
Azhar Uddin;Toru Yamada;Ryota Ochiai;E. Sasaoka;Shengji Wu
为了阐明SO2在活性炭脱除燃煤烟气中汞的作用，研究了一种商品活性炭（AC）对含SO2模拟燃煤烟气中Hg°蒸气的脱除效果。在传统的流动型填充床反应器系统中，用具有Hg°组成的模拟烟气进行Hg°去除实验。（4.9 ppb），SO 2（0或500 ppm）、CO2（10%）、H2O（0或15%），O2（0或5%），N2（平衡气体），空速（SV）为6.0 × 104 h-1，温度为60-100 °C。结果表明，对于含SO2的烟气，O2和H2O的同时存在对Hg°的脱除是必要的，降低反应温度有利于Hg °的脱除，其顺序为60 ° C> 80 °C> 100 °C。烟道中SO2的存在是未处理活性炭去除Hg°的关键。除汞前用SO2或H2SO 4预处理的活性炭，即使在无SO2存在的情况下也具有除汞活性，但SO2的存在抑制了经SO2预处理的活性炭或加H2SO 4预处理的活性炭的除汞活性.
In order to clarify the role of SO 2 in the removal of mercury from coal combustion flue gas by activated carbon, the removal of Hg° vapor from simulated coal combustion flue gas containing SO 2 by a commercial activated carbon (AC) was studied. The Hg° removal experiments were carried out in a conventional flow type packed bed reactor system with simulated flue gases having a composition of Hg° (4.9 ppb), SO 2 (0 or 500 ppm), CO 2 (10%), H 2 O (0 or 15%), O 2 (0 or 5%), and N 2 (balance gas) at a space velocity (SV) of 6.0 × 10 4 h -1 in a temperature rang 60-100 °C. It was found that, for SO 2 containing flue gas, the presence of both O 2 and H 2 O was necessary for the removal of Hg° and the Hg° removal was favored by lowering the reaction temperature in the order of 60 > 80 > 100 °C. The presence of SO 2 in the flue was essential for the removal of Hg° by untreated activated carbon. The activated carbons pretreated with SO 2 or H 2 SO 4 prior to the Hg° removal also showed Hg° removal activities even in the absence of SO 2 ; however, the presence of SO 2 also suppressed the Hg° removal of the SO 2 -pretreated AC or H 2 SO 4 preadded AC.