煤氧化和阻化机理的红外光谱法研究  

Infrared spectroscopic study on oxidation and inhibition mechanism of coal

作　　者：谢锋承[1] 于水军[1,2] 褚廷湘[1,2] 路长[1,2] 贾海林[1,2] 余明高[1,2] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南理工大学河南省煤矿瓦斯与火灾防治重点实验室,河南焦作454003

出　　处：《安全与环境学报》2011年第2期179-183,共5页Journal of Safety and Environment

基　　金：国家自然科学基金项目(50274061);教育部长江学者创新团队发展计划项目(IRT0618);国家安监总局煤矿安全生产科技发展计划项目(08-149);河南省基础与前沿技术研究计划项目(082300463205;09230041004);河南省教育厅自然科学基金项目(2007620004)

摘　　要：利用红外光谱法分析煤氧化和阻化的微观结构变化特征,对研究煤低温氧化和阻化机理有重要意义。采用TENSOR37傅里叶变换红外光谱仪,通过对阳泉无烟煤氧化和阻化的红外光谱图的分析,研究阳泉无烟煤在添加化学阻化剂前后煤分子结构的变化特征。结果表明:红外光谱图中位于高波数的羟基(—OH)吸收峰较弱,吸光度只有0.086～0.122,在加入吸水盐类阻化剂(MgCI_2)后,吸光度约为原煤样的1.5倍,谱峰明显加强;在阻化前的低温氧化过程中,酚、醇、醚、酯的C—O吸光度由0.309降到0.207,甲基(—CH_3)、亚甲基(—CH_2—)的吸光度分别由0.027、0.019、0.042和0.056降到0.012、0.010、0.031和0.047,吸收峰强度逐渐减弱,芳烃C—H吸光度分别由0 031和0.040升高到0.077和0.087;在阻化后的低温氧化过程中,C—O含量基本不变,甲基、亚甲基的吸光度分别由0.017、0.011、0.034和0.040降到0.012、0.009、0.031和0.038,吸收峰减弱的速度明显降低,芳烃C—H的变化并不大。研究表明:在高变质阳泉煤中,含氧官能团和脂肪侧链的含量很低,在低温氧化过程中,很容易被氧化;吸水盐类阻化剂MgCl_2可以通过与煤分子间发生取代和络合等作用,增加煤分子的稳定性,提高煤分子氧化的活化能,降低煤的氧化速率。It is significant to study the oxidation and inhibition mechanism of coal by analyzing the changing characteristics of coal＇s microstructure via infrared spectroscopy. By using Fourier transform infrared spectrometer TENSOR37, the spectrum of Yang-quan anthracite was analyzed and the changing characteristics of Yang-quan anthracite molecular structure were studied before and after the addition of chemical inhibitor. The results indicated that： the absorption peak of hydroxyl （—OH） that located at high wavenumber of infrared spectrum was weaker and the absorbance was only between 0.086 and 0.122, but it rose obviously after the addition of inorganic salt inhibitor （MgCl2）, which was about 1.5 times of the original coal sample. In the process of low-temperature oxidation before inhibition, the absorbance of C—O which belongs to hydroxybenzene, alcohol, ether and ester dropped from 0.309 to 0.207; the absorbance of methyl and methylene decreased respectively from 0.027, 0.019, 0.042 and 0.056 to 0.012, 0.010, 0.031 and 0.047. The rate of their absorption peaks to wear off was fast during the oxidation process. The absorbance of CH which belongs to aromatic hydrocarbon increased respectively from 0.031 and 0.040 to 0.077 and 0.087. In the process of low-temperature oxidation after inhibition, the content of C—O is almost unchanged; the absorbance of methyl and methylene dropped from 0.017, 0.011, 0.034 and 0.040 to 0.012, 0.009, 0.031 and 0.038, respectively. The wear off rate of absorption peaks was slowed down obviously and the content of CH that belongs to aromatic hydrocarbon has been found to be weakly changed. The research demonstrated that： the content of oxygen-containing functional groups and aliphatic side-chain are lower in high metamorphic Yang-quan coal, and it is easy for oxygen-containing functional groups and aliphatic side-chain to be oxidized. Metalepsy and complexation could occur between inorganic salt inhibitor and molecules of coal. Thus, the stability of coal molecules and t

关 键 词：安全学 无烟煤 自燃 氧化 阻化 红外光谱分析 

分 类 号：TD752[矿业工程—矿井通风与安全]