摘要
为了揭示氧化对不同粒径煤结构的作用机理,采用电子自旋共振波谱仪(ESR)和傅里叶红外光谱(FTIR)技术分析5种粒径的原煤、初次氧化煤、二次氧化煤,研究氧化对煤分子自由基种类、自由基浓度和官能团含量的影响。结果表明:不同粒径煤样中自由基种类数(g因子)由大到小依次为初次氧化煤,二次氧化煤,原煤,自由基浓度由大到小依次为二次氧化煤,初次氧化煤,原煤,煤粒径越小,这种变化趋势越明显;煤粒径>0.124 mm时,C—O含量由大到小依次为二次氧化煤,初次氧化煤,原煤,煤粒径<0.124 mm时,则C—O含量由大到小依次为初次氧化煤,二次氧化煤,原煤;不同粒径煤样中脂肪烃含量由大到小依次为原煤,初次氧化煤,二次氧化煤,同时初次氧化煤与二次氧化煤脂肪烃含量的差值随粒径减小而逐渐减小。
In order to reveal the mechanism of oxidation on the structure of coal samples with different particle sizes, electron spin resonance spectroscopy(ESR)and Fourier infrared spectroscopy(FTIR)were used to analyze the raw coal, primary oxidized coal and secondary oxidized coal with 5 particle sizes, and the influences of oxidation on the types of free radicals, the content distribution of free radicals and functional groups in coal molecules were studied.The results showed that the number of free radical types(g factor)of coal samples of each particle size was primary oxidized coal>secondary oxidized coal>raw coal, the value of free radical concentration was secondary oxidized coal>primary oxidized coal>raw coal, and the smaller the coal particle size was, the more obvious the change trend was.When the coal particle size was>0.124 mm, the change rule of C—O content was secondary oxidized coal>primary oxidized coal>raw coal, while when the coal particle size was<0.124 mm, the change rule of C—O content was primary oxidized coal>secondary oxidized coal>raw coal.The change rule of aliphatic hydrocarbon content in coal samples with various particle sizes was that the primary coal>and the secondary coal>Meanwhile, and the difference of aliphatic hydrocarbon between the primary coal and the secondary coal decreased with the decrease of particle sizes.
作者
杨锴
杨胜强
许芹
YANG Kai;YANG Shengqiang;XU Qin(State Key Laboratory of Coal Recourse and Safe Mining,China University of Mining&Technology,Xuzhou 221116,Jiangsu,China;Key Laboratory of Gas and Fire Control for Coal Mines,China University of Mining&Technology,Xuzhou 221116,Jiangsu,China;School of Safety Engineering,China University of Mining&Technology,Xuzhou 221116,Jiangsu,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2022年第1期17-22,共6页
Journal of Henan Polytechnic University（Natural Science）
基金
国家重点研发计划项目(2018YFC0807900)
双一流建设自主创新专项项目(2018ZZCX05)。
