Pyrolysis of coal in TGA: Extent of volatile condensation in crucible
Pyrolysis of coal in TGA: Extent of volatile condensation in crucible
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DOI：
10.1016/j.fuproc.2014.01.013
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发表时间：
2014-05-01
影响因子：
7.5
通讯作者：
Liu, Zhenyu
中科院分区：
文献类型：
--
作者：
Shi, Lei;Liu, Qingya;Liu, Zhenyu
基于对CaCO 3和聚乙烯吡咯烷酮热解过程的认识，采用不同形状和尺寸坩埚的热重分析（TGA）研究了两种煤热解挥发分的反应。TGA实验在氩气流中以10 ℃/min（-1）的加热速率进行。CaCO 3的分解表明，随着样品高度或坩埚中自由空间体积的增加，导数热重（DTG）峰温度增加，这归因于挥发性产物CO2和固体产物CaO之间的逆反应。煤衍生的焦炭上的聚乙烯吡咯烷酮的解聚显示DTG峰深度随着样品高度或坩埚的自由空间体积的增加而减小，这表明从展开产生的挥发性中间体是反应性的以形成固体。两种煤的DTG曲线非常相似。它们显示出主热解峰，该峰随样品高度和坩埚中自由空间体积的变化而变化很小，这表明挥发物在坩埚中反应形成固体的程度非常有限。(C)2014爱思唯尔有限公司版权所有。
Thermal gravimetric analysis (TGA) with crucibles of different shapes and sizes are used to evaluate reactions of volatiles generated from pyrolysis of two coals based on the understandings obtained from decomposition of CaCO3 and Polyvinylpyrrolidone. The TGA experiments were carried out in a flow of argon at a heating rate of 10 degrees C min(-1). The decomposition of CaCO3 shows an increase in derivative thermal gravimetric (DTG) peak temperature with an increase in the sample height or in the free space volume in the crucibles, which are attributed to the reverse reaction between the volatile product CO2 and the solid product CaO. The depolymerization of Polyvinylpyrrolidone supported on a coal-derived coke shows a decrease in DTG peak depth with an increase in the sample height or in the free space volume of the crucibles, indicating that the volatile intermediates generated from the deploymerization are reactive to form solid. The DTG curves of the two coals are very similar. They show a main pyrolysis peak which varies little with changes in the sample height and in the free space volume in the crucibles, suggesting that the extent of volatiles' reaction to form solid in the crucibles is very limited. (C) 2014 Elsevier B.V. All rights reserved.