基于电子顺磁共振的煤自燃阻化剂实验研究

发布时间：2018-02-04 05:23

本文关键词： 电子顺磁共振自由基阻化煤自燃　出处：《中国科技论文》2017年21期 　论文类型：期刊论文

【摘要】：为研究煤自燃阻化过程中宏观特性与自由基微观结构的关系,利用煤自燃程序升温实验装置对阻化煤样进行程序升温氧化实验,研究阻化煤样在不同阻化剂及不同条件时的宏观表征参数的变化规律。利用电子顺磁共振波谱仪,研究煤分子共价键断裂时产生自由基的特性。通过对宏观表征参数的微观分析,研究不同煤样宏观特性变化规律及其与微观特征变化之间的对应关系,得出煤自燃阻化宏观表征参数的微观机理解释,即煤氧化的难易程度取决于发生氧化后自由基浓度增加的速率;无机磷化合物阻化机理是使用该阻化剂可延缓阻止煤中部分自由基的活动;阻化过程中无机磷化合物分解产生的自由基与C—H、C迨O发生反应,其阻化效果的优劣取决于自由基是否能使部分C迨O被还原。
[Abstract]:In order to study the relationship between the macroscopical characteristics and the microstructure of free radical in the process of coal spontaneous combustion, the temperature programmed oxidation experiment was carried out by using the coal spontaneous combustion programmed temperature test device. The changes of macroscopic characterization parameters of coal samples with different inhibitors and different conditions were studied. The electron paramagnetic resonance spectrometer was used. The characteristics of free radicals produced when covalent bonds of coal molecules break are studied. Through the microscopic analysis of macroscopic characterization parameters, the variation law of macroscopic characteristics of different coal samples and the corresponding relationship between the changes of macroscopic characteristics and the changes of microscopic characteristics are studied. The microscopic mechanism explanation of macroscopic characterization parameters of coal spontaneous combustion resistance is obtained, that is, the degree of difficulty in coal oxidation depends on the rate of free radical concentration increasing after oxidation. The inhibition mechanism of inorganic phosphate compounds is that the inhibitor can delay the activity of some free radicals in coal. The free radicals produced by the decomposition of inorganic phosphate compounds react with C-H / C / O in the process of blocking reaction. The inhibition effect of the free radicals depends on whether the free radicals can reduce part of C / O.
【作者单位】：华北理工大学矿业工程学院;肥城市安驾庄镇政府;
【基金】：国家自然科学基金资助项目(51474086) 河北省自然科学基金资助项目(E2014209138) 华北理工大学培育基金资助项目(GP201511)
【分类号】：TD752.2
【正文快照】： 煤自燃是1个复杂的物理化学反应,由于煤的复杂性和多样性,使得煤自燃过程也比较复杂[1]。1996年,李增华[2]提出了煤自燃自由基反应机理,在化学自由基层面解说了煤与氧的复合过程,并利用电子顺磁共振(electron paramagnetic resonance,EPR)对张集矿肥煤和白芨沟矿无烟煤深入研

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