Effect of Microwave Radiation on the Microstructure of Coking Coal Samples

IF 0.5 Q4 ENGINEERING, CHEMICAL
Ze Pang, Qing Hai Pang, Fei Peng, Xian Ping Zhang, Zi Qing Xie, Gang Dong
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引用次数: 0

Abstract

In order to study the effect of microwave reforming process on the organic functional group structure (the way of organic combination of elements such as C, H and O) and carbon structure (carbon orderliness, microcrystalline structure, etc.) of different coking coals. Pre-treatment of coking coal (100, 200, 300 W) was carried out by 100s radiation treatment at different power, and the temperature was controlled below 200°C to prevent the coking coal from cracking. The functional group structure and carbon structure of coking coal before and after microwave treatment were analyzed using infrared spectroscopy, Raman spectroscopy methods. The results showed that with the prolongation of the microwave radiation treatment time, the overall trend of aroma fa first decreased, then increased and then decreased. The variation of DOC, the degree of aromatic ring polymerisation, varied considerably from one coal sample to another, and the ratio of the length of the main chain of the aliphatic chain to the length of the branched chain, A(CH2)/A(CH3), showed a U- or W-shaped variation. The oxygen-containing functional group structural parameter C' shows an overall increasing trend. The peak position difference PG-D between the D and G peaks ended up showing an overall decreasing trend, and the area ratio ID/IG between the D and G peaks showed a decreasing trend or the final result was basically the same as the beginning. The physical and chemical properties of coking coal were elucidated to characterize the reactive carbonaceous base point during the gasification reaction and to provide basic theoretical support for the preparation of low reactivity-high quality coke.

Abstract Image

Abstract Image

微波辐射对焦煤样品显微结构的影响
为了研究微波重整过程对不同炼焦煤有机官能团结构(C、H、O等元素的有机结合方式)和碳结构(碳有序度、微晶结构等)的影响。对100w、200w、300w的焦煤采用不同功率的100s辐射处理进行预处理,温度控制在200℃以下,防止焦煤开裂。采用红外光谱、拉曼光谱等方法对微波处理前后焦煤的官能团结构和碳结构进行了分析。结果表明,随着微波辐射处理时间的延长,香气含量总体呈先降低后升高再降低的趋势。不同煤样的DOC(芳香环聚合度)变化较大,脂肪链主链长度与支链长度之比A(CH2)/A(CH3)呈U型或w型变化。含氧官能团结构参数C′总体呈增加趋势。D峰与G峰之间的峰位差PG-D总体呈减小趋势,D峰与G峰之间的面积比ID/IG呈减小趋势或最终结果与开始基本一致。对炼焦煤的理化性质进行了分析,以表征气化反应过程中的反应性碳质基点,为制备低反应性优质焦炭提供基础理论支持。
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来源期刊
Coke and Chemistry
Coke and Chemistry ENGINEERING, CHEMICAL-
CiteScore
0.70
自引率
50.00%
发文量
36
期刊介绍: The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.
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