Effects of Chemical Forms of Alkali and Alkaline Earth Metallic Species on the Char Ignition Temperature of a Loy Yang Coal under O2/N2 Atmosphere
Effects of Chemical Forms of Alkali and Alkaline Earth Metallic Species on the Char Ignition Temperature of a Loy Yang Coal under O2/N2 Atmosphere
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DOI：
10.1021/ef2011386
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发表时间：
2012-01
期刊：
影响因子：
5.3
通讯作者：
Le Wu;Y. Qiao;Ben Gui;Chao Wang;Jingying Xu;H. Yao;Minghou Xu
中科院分区：
文献类型：
--
作者：
Le Wu;Y. Qiao;Ben Gui;Chao Wang;Jingying Xu;H. Yao;Minghou Xu
研究了碱金属和碱土金属（AAEM）物种对O2/N2条件下半焦着火行为的影响。采用丝网反应器研究了洛阳褐煤的半焦着火温度，在该反应器中挥发分的二次反应被最小化。采用水、乙酸铵和硫酸顺序萃取法从原煤中制备不同化学形态AAEM化合物的煤样。与原煤相比，醋酸铵萃取煤和硫酸萃取煤（H型煤）的平均半焦着火温度分别提高了33 ° C和55 °C，表明AAEM物种的各种化学形式对褐煤的半焦着火行为具有较强的催化作用。为了找出哪种化学形式的钠对半焦着火有更好的催化作用，还对钠交换煤进行了燃烧实验。
Experiments were performed to determine the effects of alkali and alkaline earth metallic (AAEM) species on the ignition behavior of char under O2/N2 conditions. The char ignition temperatures of a Loy Yang brown coal were investigated using a wire-mesh reactor, where the secondary reactions of the evolved volatiles were minimized. Water, ammonium acetate, and sulfuric acid sequential extractions were employed to prepare the coal samples of different chemical forms of AAEM compounds from raw coal. In comparison to that of raw coal, the increases in the average char ignition temperature of 33 and 55 °C were observed for ammonium-acetate-extracted coal and sulfuric-acid-extracted coal (H-form coal), respectively, indicating the strong catalytic effects of various chemical forms of AAEM species on the char ignition behavior of brown coal. To find out which chemical form of sodium has a higher catalytic effect on the char ignition behavior, combustion experiments were also carried out for Na-exchanged coals a...