Development of Low-Cost Functional Adsorbents for Control of Mercury (Hg) Emissions from Coal Combustion
Development of Low-Cost Functional Adsorbents for Control of Mercury (Hg) Emissions from Coal Combustion
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开发用于控制燃煤汞 (Hg) 排放的低成本功能吸附剂
DOI：
10.1021/ef3019782
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发表时间：
2013
期刊：
影响因子：
5.3
通讯作者：
Sun C
中科院分区：
文献类型：
--
作者：
Sun C
一系列对环境有利的低成本碳材料，包括粉末燃料灰（PFA）和来自不同废物流的焦炭，作为潜在的吸附剂用于通过吸附剂喷射捕集汞进行了研究。测试结果表明，在所检查的飞灰样品中，汞保留量存在很大差异，燃烧烟煤产生的飞灰通常具有最佳性能。总的来说，飞灰的汞保留能力似乎主要取决于其未燃烧的碳含量，在某种程度上，也取决于其矿物质的化学和形态特性。对于检查的焦炭样品，发现来自造纸废料的气化的那些显示出最好的性能。在没有任何进一步处理的情况下，废纸衍生的炭材料在汞保留能力方面超过基准Norit-Darco FGD碳2倍。虽然蒸汽活化和KMnO 4浸渍都可以用来提高样品的汞保留性能，一步KMnO 4浸渍被认为是更有效的，特别是对于PFA样品，蒸汽活化可能会导致较低，而不是较高的汞容量的飞灰。然而，应该注意的是，由于所涉及的化学性质，发现KMnO 4浸渍的吸附剂样品需要存在显著水平的水分才能有效地进行汞捕获。
A range of environmentally advantageous low-cost carbon materials, including pulverized fuel ashes (PFA) and chars derived from different waste streams, were examined as the potential sorbents for use in mercury capture by sorbent injection. The test results demonstrated large variations in mercury retention among the fly ash samples examined, with those generated from burning bituminous coals having the best performance in general. By and large, the mercury retention capacity of fly ash appears to be mainly determined by its unburned carbon content and, to some extent, also by the chemical and morphological properties of its mineral matter. For the char samples examined, it was found that those from the gasification of paper waste materials displayed the best performance. Without any further treatment, the wastepaper-derived char materials outperformed the benchmark Norit-Darco FGD carbon by a factor of 2, in terms of mercury retention capacities. Although steam activation and KMnO4impregnation can both be used to improve the performance in mercury retention of the samples, the one-step KMnO4impregnation was found to be much more effective, particularly for the PFA samples where steam activation could lead to lower rather than higher mercury capacities for the fly ashes. It should be noted, however, the presence of moisture at significant levels was found to be required for the KMnO4-impregnated sorbent samples to perform efficiently in mercury capture due to the chemistry involved.
高锰酸钾改性褐煤半焦的汞氧化及吸附特性
影响因子：
6.9
作者：
Zhang, Huawei;Chen, Jitao;Wang, Li
通讯作者：
Wang, Li