Identifying modes of occurrence of mercury in coal by temperature programmed pyrolysis
Identifying modes of occurrence of mercury in coal by temperature programmed pyrolysis
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DOI：
10.1016/j.proci.2010.06.108
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发表时间：
2011-01-01
影响因子：
3.4
通讯作者：
Xu, Zhenghe
中科院分区：
文献类型：
--
作者：
Luo, Guangqian;Yao, Hong;Xu, Zhenghe
了解煤炭中汞的出现模式可以提供评估通过煤炭燃烧前对煤炭进行预处理来控制汞排放的有效性所需的信息。对两种不同等级的煤（褐煤和烟煤）进行了研究，通过密度分离、酸提取程序和程序升温热解来确定煤中汞的存在模式。通过重液混合物分离将烟煤分为1.8 g/cm(3)之间的五个密度级分。密度分级组分用 HNO3 溶液提取。将处理过的样品和褐煤以 1 ℃/min 的升温速率从室温热解至 660 ℃，以研究煤程序升温热解过程中的汞释放行为。结果表明，汞的每种赋存方式都有其汞释放的特征温度范围：Hg-0 at
Understanding the modes of occurrence of mercury in coal provides information needed to evaluate effectiveness of mercury emission control by pretreatment of coal prior to coal combustion. Two coals of different rank, lignite, and bituminous coal, were investigated to identify the modes of occurrence of mercury in coal by density separation followed by acid extraction procedure and temperature programmed pyrolysis. The bituminous coal was divided into five density fraction between 1.8 g/cm(3) by separation in a heavy-liquid mixture. The density-fractionated fractions were extracted by HNO3 solution. The treated samples and the lignite were pyrolyzed at a ramp rate of 1 degrees C/min from room temperature to 660 degrees C to investigate the mercury release behavior during temperature programmed pyrolysis of coal. The results showed that each mode of occurrence of mercury has its characteristic temperature range for mercury release: Hg-0 at