Mercury enrichment and its effects on atmospheric emissions in cement plants of China
Mercury enrichment and its effects on atmospheric emissions in cement plants of China
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DOI：
10.1016/j.atmosenv.2014.04.029
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发表时间：
2014-08
影响因子：
5
通讯作者：
Feng-yang Wang;Shuxiao Wang;Lei Zhang;Hai Yang;Qingru Wu;J. Hao
中科院分区：
文献类型：
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作者：
Feng-yang Wang;Shuxiao Wang;Lei Zhang;Hai Yang;Qingru Wu;J. Hao
水泥工业是全球大气汞排放的最重要的人为来源之一。本研究以中国三家典型水泥厂为研究对象，采用安大略湿法（OHM）对水泥窑烟气中的汞进行了采样，并对固体样品进行了分析。颗粒物回收、原料预热以及使用煤和烟气脱硫产生的石膏，都促使汞向空气中排放，并在水泥中积累。超过90%的汞排放到大气中。试验工厂的汞排放系数为0.044-0.072 g/t熟料。水泥厂排放到大气中的主要形态是氧化汞，占烟气中总汞的61%~ 91%。研究结果有助于提高中国汞排放清单的准确性，并为制定汞控制措施提供有用的信息。
The cement industry is one of the most significant anthropogenic sources of atmospheric mercury emissions worldwide. In this study of three typical Chinese cement plants, mercury in kiln flue gas was sampled using the Ontario Hydro Method (OHM), and solid samples were analyzed. Particulate matter recycling, preheating of raw materials, and the use of coal and flue gas desulfurization derived gypsum contributed to emissions of Hg in the air and to accumulation in cement. Over 90% of the mercury input was emitted into the atmosphere. Mercury emission factors were 0.044–0.072 g/t clinker for the test plants. The major species emitted into the atmosphere from cement plants is oxidized mercury, accounting for 61%–91% of the total mercury in flue gas. The results of this study help improve the accuracy of the mercury emission inventory in China and provide useful information for developing mercury controls.