Impact of flue gas conditions on mercury uptake by sulfur-impregnated activated carbon
Impact of flue gas conditions on mercury uptake by sulfur-impregnated activated carbon
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DOI：
10.1021/es990315i
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发表时间：
2000-01-01
影响因子：
11.4
通讯作者：
Brown, TD
中科院分区：
文献类型：
--
作者：
Liu, W;Vidic, RD;Brown, TD
新型硫浸渍活性炭（SIAC）在纯氮气作为载气时表现出优异的汞吸收能力。本研究调查了在真实的烟气中发现的各种气体成分对SIAC性能的影响。固定床吸附试验表明，CO2（高达15%）没有影响的汞吸收SIAC，而存在的O-2（高达9%）增加了吸附容量高达30%。含氧酸性表面官能团的量的增加对汞的吸收没有影响，据推测，增强的性能是由于由SIAC催化的HgO的形成。水分的存在（高达10%）会使SIAC的汞吸收能力降低25%，这是由于竞争性吸附和额外的内部传质阻力。SO2（1600 ppm）和NO（500 ppm）表现出没有影响的汞吸收SIAC，即使在10%的水分的存在下。当反应温度从140 ℃升高到250 ℃和400 ℃时，由于HgS形成的明显放热性质，SIAC的吸附容量显著降低，但增加空床接触时间可以部分抵消这种容量损失。
Novel sulfur-impregnated activated carbons (SIACs) have shown excellent mercury uptake capacity when pure nitrogen was used as a carrier gas. This study investigated the impact of various gas constituents found in a real flue gas on the performance of SIACs. Fixed-bed adsorber tests showed that CO2 (up to 15%) had no impact on mercury uptake by SIAC, while the presence of O-2 (up to 9%) increased the adsorptive capacity up to 30%. Increase in the amount of oxygen-containing acidic surface functional groups had no impact on mercury uptake, and it is postulated that the enhanced performance was due to the formation of HgO catalyzed by SIAC. Moisture presence (up to 10%) can decrease SIAC's capacity for mercury uptake by as much as 25% due to competitive adsorption and additional internal mass transfer resistance. SO2 (1600 ppm) and NO (500 ppm) exhibited no impact on mercury uptake by SIAC even in the presence of 10% moisture. Adsorptive capacity of SIAC decreased significantly when the reaction temperature increased from 140 to 250 and 400 degrees C due to the pronounced exothermic nature of HgS formation, but increasing the empty-bed contact time can partially offset this loss of capacity.