Adsorption of condensable particulate matter from coal-fired flue gas by activated carbon
Adsorption of condensable particulate matter from coal-fired flue gas by activated carbon
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活性炭吸附燃煤烟气中可凝性颗粒物
DOI：
10.1016/j.scitotenv.2021.146245
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发表时间：
2021
影响因子：
9.8
通讯作者：
Hongwei Zhang
中科院分区：
文献类型：
--
作者：
Xiaoyu Zhang;Yuzhong Li;Zhuping Zhang;Maofeng Nie;Lu Wang;Hongwei Zhang
可凝结颗粒物是一种特殊的一次颗粒物，在排放前处于气态。排放后，通过大气稀释和冷却迅速形成液体或固体颗粒，对环境和人体健康有害。然而，目前对控制CPM的研究还很缺乏。因此，活性炭（AC）上的CPM在不同温度下的吸附效果进行了研究，使用EPA方法202。结果表明，90 °C时活性炭对CPM的去除率可达19%~ 22%。无机组分的去除率高于有机组分。活性炭对CPM中的Cl-、NH 4+和Hg有明显的吸附作用，而对CPM中的SO 42+、NO3-等金属元素的吸附作用较小。活性炭对CPM中的剧毒芳香族化合物有显著的吸附作用。在35-170 °C的烟气温度范围内，随着烟气温度的降低，活性炭吸附对CPM的去除率提高，且对无机组分的吸附效果更为明显。此外，以130 °C的烟气为初始烟气，在35 °C时，冷凝-吸附对CPM的去除率可达51%。
Condensable particulate matter (CPM) is a special kind of primary particulate matter and is in a gaseous state before discharge. After discharge, it rapidly forms liquid or solid particles through atmospheric dilution and cooling, which are harmful to the environment and human health. However, current research on controlling CPM is lacking. Therefore, the adsorption effects of activated carbons (ACs) on CPM at different temperatures were studied using EPA Method 202. Results showed that the removal efficiency range of CPM at 90 °C by ACs could reach 19%–22%. The removal efficiency of the inorganic fraction was higher than that of the organic fraction. ACs had obvious adsorption effects on Cl−, NH4+, and Hg in CPM but had marginal adsorption effects on SO42+, NO3−, and other metal elements in CPM. ACs had prominent adsorption effects on extremely toxic aromatic compounds in CPM. At a flue gas temperature of 35–170 °C, the efficiency of CPM removal through AC adsorption could increase with decreasing flue gas temperature, and this effect was more obvious during the adsorption of inorganic fractions. In addition, the efficiency of CPM removal through condensation and adsorption could reach up to 51% at 35 °C when flue gas at 130 °C was used as the initial flue gas.