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利用XPS测试技术对兴成肥煤低温氧化规律进行实验研究。硫元素XPS氧化前后测试结果对比分析表明原煤硫元素中硫化物硫和硫铁矿硫占比最高,而有机硫中噻吩硫含量最高,其次为砜和亚砜。氧化后煤表面噻吩硫相对含量降低,有机硫中的部分硫化物硫氧化成亚砜,亚砜进一步氧化成砜,导致砜相对浓度增加,而亚砜缺失。原煤氮元素谱图分析可知兴成煤中氮主要存在于煤分子的边缘,约21%氮以季氮形式镶嵌于煤分子芳香结构中,煤中吡咯氮含量最高。氧化后XPS结果表明在氧化过程中与氮相连的氧原子脱除,氧化型氮转变为其他形态,且很大一部分转化为吡啶。
The XPS test technique was used to study the low temperature oxidation of Hedong fat coal. Comparative analysis of test results before and after sulfur element XPS showed that sulfur sulfur and pyrite accounted for the highest proportion of sulfur in sulfur and sulfur sulfur in organic sulfur, followed by sulfone and sulfoxide. After the oxidation, the relative content of thiophene sulfur on the surface of the coal decreases. Some of the sulfur in the organic sulfur is oxidized to sulfoxide and the sulfoxide is further oxidized to the sulfone, resulting in an increase in the relative concentration of sulfone and a loss of the sulfoxide. Analysis of nitrogen elemental spectrum of raw coal shows that nitrogen in Xingcheng coal exists mainly at the edge of coal molecules. About 21% nitrogen is embedded in the aromatic structure of coal by quaternary nitrogen, and pyrrole nitrogen content in coal is the highest. Oxidation of XPS results showed that during oxidation the oxygen atoms attached to nitrogen were removed, the oxidized nitrogen was converted to other forms, and a significant portion was converted to pyridine.