Impact of sulfur oxides on mercury capture by activated carbon
Impact of sulfur oxides on mercury capture by activated carbon
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DOI：
10.1021/es0708316
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发表时间：
2007-09-15
影响因子：
11.4
通讯作者：
Granite, Evan J.
中科院分区：
文献类型：
--
作者：
Presto, Albert A.;Granite, Evan J.
最近的活性炭喷射（ACI）除汞现场试验表明，在含有高浓度硫氧化物（SOx）的烟道气中，汞捕获有限。为了更全面地了解SOx对ACI的影响，使用填充床反应器和模拟烟气（SFG）在不同SO2和SO3浓度条件下测试了汞捕获。活性炭的最终汞含量与SFG中的SO2浓度无关，但即使在最低测试浓度（20 ppm）下，SO3的存在也会抑制汞捕获。汞去除能力随着所用活性炭的硫含量从1%增加到10%而降低。在一个极端的情况下，通过H2SO4浸渍制备的含10%硫的活性炭几乎没有汞容量。结果表明，汞和硫氧化物在竞争碳表面上的相同的结合位点。
Recent field tests of mercury removal with activated carbon injection (ACI) have revealed that mercury capture is limited in flue gases containing high concentrations of sulfur oxides (SOx). In order to gain a more complete understanding of the impact of SOx on ACI, mercury capture was tested under varying conditions Of SO2 and SO3 concentrations using a packed bed reactor and simulated flue gas (SFG). The final mercury content Of the activated carbons is independent of the SO2 concentration in the SFG, but the presence of SO3 inhibits mercury Capture even at the lowest concentration tested (20 ppm). The mercury removal capacity decreases as the sulfur content of the used activated carbons increases from 1 to 10%. In one extreme case, an activated carbon with 10% sulfur, prepared by H2SO4 impregnation, shows almost no mercury capacity. The results suggest that mercury and sulfur oxides are in competition for the same binding sites on the carbon surface.