新矿集团孙村矿煤层自燃特性研究

发布时间：2018-08-15 19:18

【摘要】：煤层自燃问题不仅严重影响着煤炭工业的发展，同时也给煤炭生产带来很大的安全问题。但由于实际条件下煤的自燃过程极其复杂且影响因素较多，因此，煤层自然发火期的预测、预报技术的发展受到严重制约。本文以孙村煤矿的煤样为研究对象，首先建立了煤自燃的热点学说，认为煤自燃是从部分孔隙的局部热点开始的，在这些孔隙中由于煤的化学反应不断地产生热量，当产生的热量和散失的热量达到平衡时，即达到了自然发火的临界点，文中根据相应的热点理论，采用电子显微镜对煤细观进行了分析，初步得到了煤自燃的温度场和孔隙的变化规律。对于自然发火的临界点，，本文基于热平衡基础建立了煤自燃评价参数θ，并在实验室试验中证明了该评价指标的正确性，文中还对影响煤自燃的有关参数的特性进行了分析，认为孔隙率对自然发火期的影响最为明显，其次是氧气浓度，再次为煤样初始温度。由于孔隙率和供氧浓度是影响煤的活化能的主要影响因素，所以，应注意煤活化能的研究。文中还建立了一套实验系统，该实验系统可在现场取样，在煤矿进行实验，得到的实验结果对于生产实际具有一定的指导意义。文中基于自燃理论与实验测定的煤样数据，着重介绍了孙村矿煤层的自燃特性。分析得到了孙村煤层的自然发火期与煤层深度的关系、通风风速与二氧化碳解析率的关系、甲烷气体的解吸量与矿井深度等关系。研究结果表明，所建立的实验系统能够较好地模拟井下煤自燃过程，计算得到的自燃参数变化规律对于矿井生产具有实际指导意义。
[Abstract]:Coal seam spontaneous combustion not only seriously affects the development of coal industry, but also brings great safety problems to coal production. However, the process of spontaneous combustion of coal is extremely complex under the actual conditions and there are many influencing factors. Therefore, the prediction of spontaneous combustion period of coal seam and the development of forecasting technology are seriously restricted. In this paper, the coal samples of Suncun Coal Mine are taken as the research object. Firstly, the hot spot theory of coal spontaneous combustion is established. It is considered that the spontaneous combustion of coal begins from the local hot spot of some pores, in which the heat is produced continuously because of the chemical reaction of coal. The critical point of spontaneous combustion has been reached when the heat produced and the heat lost have reached the equilibrium. According to the relevant hot spot theory, the microscopic analysis of coal is carried out by means of electron microscope. The temperature field and pore variation of coal spontaneous combustion were preliminarily obtained. For the critical point of spontaneous combustion, the evaluation parameter 胃 of coal spontaneous combustion is established on the basis of heat balance, and the correctness of the evaluation index is proved in the laboratory test. The characteristics of the related parameters that affect the spontaneous combustion of coal are also analyzed in this paper. It is considered that the porosity has the most obvious effect on the spontaneous combustion period, followed by the oxygen concentration and the initial temperature of the coal sample. Since porosity and oxygen supply concentration are the main factors affecting the activation energy of coal, attention should be paid to the study of activation energy of coal. A set of experimental system has been set up in this paper. The experimental system can be sampled on the spot and tested in coal mine. The experimental results are of certain guiding significance for practical production. Based on the spontaneous combustion theory and experimental data, the spontaneous combustion characteristics of coal seam in Suncun Coal Mine are introduced in this paper. The relationship between the spontaneous combustion period of Suncun coal seam and coal seam depth, the relationship between ventilation wind speed and carbon dioxide resolution rate, and the relationship between methane desorption amount and mine depth are obtained. The results show that the established experimental system can simulate the spontaneous combustion process of underground coal well, and the calculated variation law of spontaneous combustion parameters is of practical significance for mine production.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TD752.2

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