Effects of Dewatering on the Pyrolysis and Gasification Reactivity of Victorian Brown Coal
Effects of Dewatering on the Pyrolysis and Gasification Reactivity of Victorian Brown Coal
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DOI：
10.1021/ef060404y
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发表时间：
2007-03
期刊：
影响因子：
5.3
通讯作者：
Cai Zeng;S. Clayton;Hongwei Wu;J. Hayashi;Chun-Zhu Li
中科院分区：
文献类型：
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作者：
Cai Zeng;S. Clayton;Hongwei Wu;J. Hayashi;Chun-Zhu Li
本研究旨在研究脱水对维多利亚褐煤一次热解行为和气化反应性的影响。将褐煤在水蒸气中脱水/干燥，并用机械热表示法(MTE)制备了脱水褐煤样品。分别在丝网反应器和热重分析仪(TGA)中评价了这些脱水煤/半焦的一次热解行为和气化反应活性。研究发现，褐煤物理结构的变化和低温脱水过程中氯化钠的损失对焦炭和焦油的产率没有显著影响。然而，在>；250℃的温度下脱水/干燥不仅降低了挥发物的产率，而且在恒定升温速率下热重分析的归一化导数热重(DTG)峰向更高的温度移动。用分布活化能模型分析了褐煤脱水后的热解动力学。
This study aims to investigate the effects of dewatering on the primary pyrolysis behavior and gasification reactivity of Victorian brown coal. Dewatered brown coal samples were prepared by dewatering/drying of the brown coal in steam and by means of mechanical thermal expression (MTE). The primary pyrolysis behavior and gasification reactivity of these dewatered coal/char samples were evaluated in a wire-mesh reactor and in a thermogravimetric analyzer (TGA), respectively. It was found that changes in the physical structure of the brown coal and the loss of NaCl during dewatering at low temperatures did not significantly affect the char and tar yields. However, dewatering/drying at temperatures > 250 °C not only reduced the volatile yield but also shifted the normalized derivative thermogravimetric (DTG) peak to a higher temperature during pyrolysis in the TGA under constant heating rates. The analysis of the pyrolysis kinetics of dewatered brown coal samples using a distributed activation energy model i...