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煤微波氧化脱硫中含硫组分及介电特性变化

发表时间:2016-12-31  浏览量:1436  下载量:390
全部作者: 张明旭,刘松,徐敬尧,贾送宽
作者单位: 安徽理工大学材料科学与工程学院
摘 要: 选用新阳高硫煤样,在微波频率2.45 GHz条件下,以HAc-H2O2溶液为助剂开展微波脱硫试验,采用X射线衍射(X-ray diffraction,XRD)和X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)对试验前后煤中含硫组分进行分析表征,基于传输反射法对煤样的复介电常数进行测定。结果表明,新阳高硫煤样的全硫脱除率为47.64%,试验后煤中无机硫含量极少。XRD分析显示煤中黄铁矿、方解石在试验后消失,XPS解叠出新阳高硫煤样中有机硫组分主要为噻吩硫、亚砜硫和硫醇硫醚硫3类,其中噻吩硫约占有机硫组分的63.53%,硫醇硫醚硫含量最少,有机硫脱除率为29.63%,煤中含硫组分由易到难的脱除次序为:无机硫、硫醇硫醚硫、亚砜硫、噻吩硫;试验后煤样与微波的耦合能力降低,其复介电常数实部ε′和虚部ε″均低于原煤,尤其在12~15 GHz频率范围内虚部ε″降幅较为明显,试验后煤样吸收微波能力显著降低。
关 键 词: 选矿工程;高硫炼焦煤;微波;含硫组分;介电特性
Title: Changes about sulfur components and dielectric properties of high-sulfur coal by microwave-assisted desulfurization
Author: ZHANG Mingxu, LIU Song, XU Jingyao, JIA Songkuan
Organization: School of Materials Science and Engineering, Anhui University of Science and Technology
Abstract: The desulfurization experiment of Xinyang high-sulfur coal is conducted with HAc-H2O2 solution by 2.45 GHz microwave irradiation. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) are used to characterize the composition of coal samples, and the complex dielectric constant of Xinyang high-sulfur coal is measured by transmission and reflection method. Results indicate that the desulfurization rate of Xingyang high-sulfur coal is 47.64%, and very little inorganic sulfur is contented after experiment. The measurements of XRD show that pyrite and calcite in coal disappear after experiment; the analysis of XPS show that three main types of organic sulfur components in coal are thiophene, sulfoxide and mercaptan-thioether, and thiophene can reach to about 63.53% in organic sulfur, while mercaptan thioether is the least with the desulfurization rate is 29.63%. The order of desulfurization is inorganic-sulfur, mercaptan-thioether, sulfoxide and thiophene. The real part ε′ and imaginary part ε″ of the complex dielectric constant are reduced after experiment, especially in 12-15 GHz frequency range, the imaginary part ε″ has a significant decline, and it shows that the coupling capability between coal and microwave reduce after experiment.
Key words: mineral processing engineering; high-sulfur coking coal; microwave; sulfur components; dielectric properties
发表期数: 2016年12月第24期
引用格式: 张明旭,刘松,徐敬尧,等. 煤微波氧化脱硫中含硫组分及介电特性变化[J]. 中国科技论文在线精品论文,2016,9(24):2552-2558.
 
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