煤氧化气体生成规律与微观官能团变化的关联研究

发布时间：2018-03-19 23:04

本文选题：恒温氧化　切入点：宏观特点　出处：《太原理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国大部分煤层属于自燃煤层,煤氧化引起的自燃火灾不仅浪费矿产资源,而且造成环境污染,并严重威胁矿井的安全生产[14]。本论文采用实验处理与理论分析的方法,针对不同煤种的低温氧化阶段,研究煤恒温氧化过程的气体生成规律与微观官能团变化特征,同时从宏观与微观两个角度揭示煤氧化机理,对预防与治理煤氧化自燃具有重要的意义。利用恒温装置系统与气相色谱仪,对不同种煤样在不同粒径、不同质量条件下进行恒温氧化实验。通过分析不同氧化时间的耗氧速率、CO生成速率等特定参数,得出不同条件下煤低温氧化阶段的气体产物特征和变化趋势,并根据煤样反应罐内氧气浓度变化情况,得出不同粒径、不同质量、不同煤种条件下煤低温氧化过程随氧气浓度的变化规律,并定量的标定不同变量条件下,煤样耗氧速率、CO生成速率与恒温氧化时间的关系,分析低温下煤氧化反应的基本机理,从而掌握煤氧化过程的本质宏观变化规律。与此同时,通过傅里叶红外光谱实验,对不同变质程度、不同粒径、不同恒温氧化时间煤样的红外光谱特征进行了分析与研究,从微观角度分析了不同条件下煤分子中羟基、羰基、芳香烃的等官能团的变化趋势,得出了煤分子中活性基团含量的差别,造成了煤分子化学结构上的不同,从煤内在属性上决定了其氧化自燃的难易程度[1]。煤氧复合反应是个整体系统,煤氧化进程的外在宏观现象与煤内在分子官能团变化均反应出煤氧化特点与反应规律,通过对气体参数的微观分析,研究了不同煤样宏观气体生成规律与其微观特征变化之间的对应关系,得出了煤氧化过程特定气体参数的微观解释,同时从宏观与微观两个角度解释,验证煤氧化反应过程中现象与参数的变化情况,进一步的掌握低温条件下煤氧化过程的发展规律,为拓展煤自燃的评价指标体系与完善煤自燃的防治工作提供了理论基础与技术保障。
[Abstract]:Most coal beds in China belong to spontaneous combustion coal seams. Spontaneous combustion fires caused by coal oxidation not only waste mineral resources, but also cause environmental pollution, and seriously threaten the safety of mine production. [14] this paper adopts the methods of experimental treatment and theoretical analysis. In view of the low temperature oxidation stage of different kinds of coal, the formation law of gas and the change characteristics of micro functional groups in the process of constant temperature oxidation of coal are studied. At the same time, the oxidation mechanism of coal is revealed from both macroscopic and micro angles. It is of great significance to prevent and control coal oxidation spontaneous combustion. The constant temperature oxidation experiments were carried out on different coal samples under different particle size and different quality by using constant temperature equipment system and gas chromatograph. The specific parameters such as oxygen consumption rate and CO formation rate of different oxidation time were analyzed. The characteristics and trends of gas products in the low temperature oxidation stage of coal under different conditions were obtained. According to the change of oxygen concentration in the coal sample reaction tank, different particle sizes and different mass were obtained. The relationship between the rate of CO formation and the oxidation time of coal at constant temperature is quantitatively calibrated under different coal conditions, and the basic mechanism of oxidation reaction of coal at low temperature is analyzed. In order to grasp the essence of the coal oxidation process macro-change law. At the same time, the infrared spectra of coal samples with different degrees of metamorphism, different particle sizes and different oxidation time at constant temperature were analyzed and studied by Fourier transform infrared spectroscopy (FTIR). The hydroxyl groups in coal molecules under different conditions were analyzed from the microcosmic point of view. The variation trend of isofunctional groups of carbonyl and aromatic hydrocarbons, the difference of active group content in coal molecules is obtained, which leads to the difference in molecular chemical structure of coal, which determines the degree of difficulty in oxidation spontaneous combustion of coal from the intrinsic properties of coal [1]. Coal-oxygen complex reaction is an integral system. Both the external macroscopic phenomena of coal oxidation process and the changes of internal molecular functional groups of coal reflect the characteristics and law of coal oxidation. In this paper, the corresponding relation between the macroscopic gas generation law of different coal samples and the change of their microscopic characteristics is studied, and the microscopic interpretation of the specific gas parameters in the coal oxidation process is obtained, which is explained from both macroscopic and microscopic angles. To verify the changes of the phenomena and parameters in the coal oxidation reaction process, and to further master the development law of the coal oxidation process under the low temperature conditions. It provides the theoretical basis and technical guarantee for expanding the evaluation index system of coal spontaneous combustion and perfecting the prevention and cure work of coal spontaneous combustion.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD752.2

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