Re-examination of Thermogravimetric Kinetic Analysis of Lignite Char Gasification
Re-examination of Thermogravimetric Kinetic Analysis of Lignite Char Gasification
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DOI：
10.1021/acs.energyfuels.9b02946
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发表时间：
2019
期刊：
影响因子：
5.3
通讯作者：
Shusaku Asano;C. Choi;Ken-Ichi Ishiyama;Shinji Kudo;Xiangpeng Gao;J. Hayashi
中科院分区：
文献类型：
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作者：
Shusaku Asano;C. Choi;Ken-Ichi Ishiyama;Shinji Kudo;Xiangpeng Gao;J. Hayashi
采用热重法对维多利亚褐煤的CO2气化动力学进行了研究。经过严格酸洗的褐煤的半焦气化反应非常缓慢。由于几乎不存在固有的碱金属和碱土金属（AAEM）物质，需要超过600分钟的完全气化。但要消除传质效应，必须严格选择以下条件：焦炭初始质量<1.3 mg，焦炭粒径<125 μm，总气体流量≥1000 mL/min。这种要求是由于炭颗粒内CO对非催化气化的抑制作用。另一方面，从原始褐煤的焦炭气化速度比非催化气化，并在50分钟内完成的催化固有AAEM物种。催化气化的测定速率，出乎意料的是，独立的初始焦炭质量和颗粒。
Kinetic analysis of CO2 gasification by thermogravimetry was examined employing chars from a Victorian lignite. The gasification of char from the rigorously acid-washed lignite was extremely slow. More than 600 min was required for the complete gasification as a result of a near absence of inherent alkali and alkaline earth metallic (AAEM) species. It was nonetheless necessary to strictly choose the following conditions for eliminating the mass transfer effect: an initial mass of char of <1.3 mg, a particle size of char of <125 μm, and a total gas flow rate of ≥1000 mL standard temperature and pressure min–1. Such requirement arose from the inhibition of non-catalytic gasification by CO within the char particle. On the other hand, the char from the original lignite was gasified much faster than the non-catalytic gasification and completed within 50 min by catalysis of the inherent AAEM species. The measured rate of catalytic gasification was, unexpectedly, independent of the initial char mass and particle...