Effect of mineral matter on structure and dielectric properties of chars

被引：23

作者：

Liu, Haiyu ^{[1
]}

Xu, Liang ^{[1
]}

Jin, Yan ^{[1
]}

Fan, Baoguo ^{[1
]}

Qiao, Xiaolei ^{[1
]}

Yang, Yanxia ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Sch Elect & Power Engn, Taiyuan 030024, Shanxi, Peoples R China

来源：

FUEL | 2018年 / 222卷

基金：

中国国家自然科学基金;

关键词：

Dielectric property; Mineral matter; Phase transformation; Coal char; VICTORIAN BROWN-COAL; CARBOTHERMAL REDUCTION; BITUMINOUS COAL; SILICON-CARBIDE; HEAT-TREATMENT; MICROWAVE; PYROLYSIS; REACTIVITY; COMBUSTION; CARBON;

D O I：

10.1016/j.fuel.2018.02.161

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：

The study was undertaken to investigate the changes of mineral matters in coal during heat treatment and its effect on structure and dielectric properties of generated chars. An acid treatment method was adopted to remove mineral matters in coal for preparing chars at 850-1600 degrees C using an electric furnace. Dielectric properties of coal chars were determined with the transmission/reflection method. Also, phase structure of coal chars was examined by X-ray diffraction (XRD). Significant transformation was found in the presence of mineral matters during heat treatment. Especially the process of creating silicon carbide (SiC) above 1300 degrees C in carbothermal reduction played a catalytic role on char structure. Consequently, dielectric properties were improved with the increase of structural ordering. These results could be instructive for the application of mineral matters in microwave technique at higher temperatures.

引用

页码：370 / 374

页数：5

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