Physicochemical properties of Indonesian lignite continuously modified in a tunnel-type microwave oven for slurribility improvement

被引：16

作者：

Cheng, Jun ^{[1
]}

Zhou, Fan ^{[1
]}

Wang, Xin ^{[1
]}

Liu, Jianzhong ^{[1
]}

Zhou, Junhu ^{[1
]}

Cen, Kefa ^{[1
]}

机构：

[1] Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China

来源：

FUEL | 2015年 / 150卷

关键词：

Lignite; Modification; Microwave irradiation; Oxygen functional group; Coal water slurry; COAL-WATER SLURRY; CHEMICAL-STRUCTURE CHANGES; LOW-RANK COAL; BROWN-COAL; CHINESE LIGNITE; RHEOLOGICAL BEHAVIORS; SLURRYABILITY; PRETREATMENT; ENHANCEMENT; IRRADIATION;

D O I：

10.1016/j.fuel.2015.02.051

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Indonesian lignite was continuously modified in a tunnel-type microwave oven to improve its slurribility. The maximum solid concentration of coal-water slurry (CWS) prepared from modified lignite increased from 41.6 wt.% to 54.0 wt.% with an enhanced rheological behaviour. The contact angle, oxygen functional groups, molar ratio of methylene to methyl, paramagnetic centres of modified lignite were analysed on contact angle analyzer, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy to clarify the modification mechanisms. The molar ratio of the methyl group to the methylene group of the modified lignite decreased, resulting in shortened aliphatic chains and condensed aromatic rings. The unpaired electrons concentration of the modified lignite increased, implying that the coal rank was upgraded. As a result, the contact angle of the modified lignite increased and oxygen functional groups with high hydrophilicity decreased, leading to an improved CWS property. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：493 / 500

页数：8

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