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首页> 外文期刊>Combustion Science and Technology >The Relationship between Functional Groups and Gaseous Productions and Micro pore Structures Development of Coal Oxidized at Low Temperature under Methane-Diluted Atmospheres
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The Relationship between Functional Groups and Gaseous Productions and Micro pore Structures Development of Coal Oxidized at Low Temperature under Methane-Diluted Atmospheres

机译：甲烷稀薄气氛下低温氧化的煤的官能团与产气及微孔结构发展的关系

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As coal reservoirs containing high methane content are more prone to spontaneous combustion, disasters caused by the combined effects of methane and coal spontaneous combustion have been increasingly prominent. Given that air flows in different zones in a goaf contain methane with different contents, the mechanism governing the changes of micropores and functional groups of left-over coal subjected to spontaneous combustion in a goaf with air flows containing methane were investigated by sufficiently considering the diluted influence of methane. The change of microscopic functional groups and variation of gaseous products from coal oxidized at low-temperature (i.e., 70 degrees C< it < 230 degrees C) under different oxidizing atmospheres were separately acquired by employing Fourier transform infrared spectroscopy (FTIR) and gas chromatography. By using the Brunauer, Emmett and Teller (BET) method, a low-temperature nitrogen adsorption experiment was carried out on coal samples taken from the Shigang coal mine in Shanxi province, China under different methane-diluted oxidizing atmospheres. The results showed that the content of aliphatic hydrocarbons (methyl and methylene) of the coal oxidized at low temperature decreased with rising oxidizing temperature and reached a maximum at the condition of a 25% methane concentration. Meanwhile, other oxygen-containing functional groups and corresponding gaseous products were generated. The aforementioned results indicated that the initial temperature for the generation of CO and the amount generated both showed delayed effects in oxidizing atmospheres with different methane concentrations. By carrying out a low-temperature nitrogen adsorption experiment, it was determined that the average sizes of the pores in coal decreased in an oxidizing atmosphere (i.e., < 15% methane concentrations at a high temperature). However, the specific surface area (SSA) and accumulative total internal surface area of the pores increased. Additionally, the pore structure in the coal tended to be microscopic and complex in the aforementioned oxidizing atmosphere, as determined by using the fractal dimension D. The pore structure in the coal was increasingly complex after being oxidized in an oxidizing atmosphere containing methane, which increased the likelihood of the coal oxidation reaction and increased the occurrence probability of coal spontaneous combustion.
机译：随着甲烷含量高的煤储层更易于自燃，由甲烷和煤自燃的综合作用引起的灾害日益突出。考虑到采空区不同区域内的气流中甲烷含量不同，充分研究了稀释后的煤层气，研究了采空区中自燃后剩余煤的微孔和官能团变化的机理。甲烷的影响。通过傅里叶变换红外光谱（FTIR）和气相色谱分别获得了在不同氧化气氛下在低温（即70摄氏度<230摄氏度<230摄氏度）下被氧化的煤的微观官能团的变化和气态产物的变化。 。采用Brunauer，Emmett和Teller（BET）方法，在不同的甲烷稀释氧化气氛下，对从中国山西省石岗煤矿采集的煤样品进行了低温氮吸附实验。结果表明，低温氧化的煤中脂肪烃（甲基和亚甲基）的含量随氧化温度的升高而降低，在甲烷浓度为25％的条件下达到最大值。同时，产生了其他含氧官能团和相应的气态产物。前述结果表明，CO生成的初始温度和生成量均在具有不同甲烷浓度的氧化气氛中显示出延迟作用。通过进行低温氮吸附实验，确定了在氧化性气氛中煤的孔的平均尺寸减小了（即，在高温下＜15％的甲烷浓度）。然而，孔的比表面积（SSA）和累积的总内表面积增加。另外，通过使用分形维数D确定，在上述氧化气氛中，煤中的孔结构趋于微观且复杂。煤中的孔结构在包含甲烷的氧化气氛中被氧化后变得越来越复杂。煤发生氧化反应的可能性增加了煤自燃的发生概率。

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