水浸煤二次氧化特性研究

发布时间：2018-05-09 18:35

本文选题：耗氧速率 + 放热强度　；参考：《煤矿安全》2017年07期

【摘要】：为了研究水浸煤二次氧化特性参数,对实验的6种煤样进行程序升温实验,检测其比表面积及孔径并进行分析。结果表明:预氧化后的水浸煤较预氧化后的原煤二次氧化气体生成速率及放热强度均有所增大,并且随着预氧化的温度升高,气体生成速率及放热强度也有所增大;预氧化后的水浸煤活化能较预氧化后的原煤和未氧化的原煤均低,随着预氧化温度的升高,活化能也有所降低,导致其自燃倾向性增加;水浸煤比表面积在同等条件下远大于原煤,随着预氧化温度的提高,原煤和水浸煤的比表面积均呈现下降趋势;二次氧化对实验所用的原煤、水浸煤的最可几孔径几乎没有影响,均为4 nm,在最可几孔径下,煤的微分孔体积/平均孔径随着预氧化的温度升高而逐渐降低。
[Abstract]:In order to study the characteristic parameters of secondary oxidation of water-impregnated coal, six kinds of coal samples were programmed to test their specific surface area and pore size and analyze them. The results show that the rate of formation and exothermic strength of secondary oxidation gas of pre-oxidized coal is increased compared with that of pre-oxidized coal, and the gas formation rate and exothermic intensity also increase with the increase of pre-oxidation temperature. The activation energy of pre-oxidized coal is lower than that of pre-oxidized coal and unoxidized coal. With the increase of pre-oxidation temperature, the activation energy also decreases, which leads to the increase of spontaneous combustion tendency. The specific surface area of water-impregnated coal is much larger than that of raw coal under the same conditions. With the increase of pre-oxidation temperature, the specific surface area of both raw coal and water-immersed coal decreases. The maximum pore size of water-impregnated coal is almost equal to 4 nm, and the differential pore volume / average pore size decreases with the increase of preoxidation temperature.
【作者单位】：太原理工大学矿业工程学院;
【基金】：国家国际科技合作资助项目(2011DFA72310) 国家自然科学基金资助项目(51274146)
【分类号】：TD752.2

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