基于指标气体变化规律的煤氧化自燃预报实验研究

发布时间：2018-05-25 13:18

  本文选题：指标气体 + 临界温度　； 参考：《中国矿业大学》2014年硕士论文

【摘要】：采空区自然发火直接威胁矿井的安全生产，制约综采放顶煤技术的发展，已成为实现综放面高产高效和安全生产的主要障碍之一。实现煤炭自燃特性的准确认知是避免采空区自然发火的必要条件。 煤炭自燃特性如临界温度、最短自然发火期及指标气体优选对自燃预测具有良好的指导意义。但以上指标的分析往往依赖于技术人员经验，主观性较强。本文基于程序升温实验，对指标气体变化规律进行研究，综合分段拟合、回归分析、关联度分析等方法，以期实现较为客观的煤样临界温度分析计算，最短发火期预测及较高温度段指标气体优选。 本文通过对指标气体变化规律的分析，建立了基于耗氧速率和CO气体浓度变化的氧化动力学参数计算模型，通过分段拟合计算了不同温度阶段表观活化能，分析得到了不同变质程度煤样的临界温度变化规律；汇总了20个不同煤质煤样活化能、水分、硫分、灰分等实验数据，并采用SPSS软件建立了实验最短发火期的线性回归预测模型；进行了较高温度阶段（100~200℃）指标气体及相关比值与温度的灰色B型关联度分析，优选了煤样自燃预报气体。 应用上述方法对和顺一缘煤矿15#煤层煤样自燃特性进行分析，并采用Fluent软件对1523综放面采空区指标气体CO浓度积聚规律的进行了探讨。结果表明，煤样氧化升温临界温度在95~105℃范围内，采空区指标气体CO临界阶段预报范围为0.51-1.94ppm/℃，实验最短发火期为121天，较高温度阶段优选预报气体为C2H6气体，，所得工作面回风隅角CO的积聚浓度最大为88ppm，采空区最高浓度为772ppm，是CO气体监控及煤自燃火灾防治的重点。 本研究结论实现了对氧化升温阶段煤自燃特性的数据化判断，对指导采空区遗煤自燃的现场预报工作具有积极意义。
[Abstract]:Spontaneous combustion in goaf directly threatens the safety of mine production and restricts the development of fully mechanized top coal caving technology. It has become one of the main obstacles to realize high yield and high efficiency and safe production of fully mechanized caving face. Realizing accurate cognition of coal spontaneous combustion is a necessary condition to avoid spontaneous combustion in goaf. The characteristics of coal spontaneous combustion such as critical temperature, the shortest spontaneous combustion period and the optimal selection of index gas have good guiding significance for the prediction of spontaneous combustion. However, the analysis of the above indexes often depends on the experience of technical personnel and is subjective. Based on the temperature programmed experiment, this paper studies the change law of index gas, synthesizes the methods of piecewise fitting, regression analysis, correlation analysis and so on, in order to realize more objective analysis and calculation of critical temperature of coal sample. Prediction of the shortest ignition period and optimal selection of target gases at higher temperatures. Based on the analysis of the variation law of the index gas, the oxidation kinetics parameter calculation model based on oxygen consumption rate and CO concentration variation is established, and the apparent activation energy at different temperature stages is calculated by piecewise fitting. The critical temperature variation of coal samples with different metamorphic degree was obtained, and the experimental data of activation energy, moisture, sulfur, ash and so on were collected from 20 coal samples with different metamorphism. The linear regression prediction model for the shortest firing period of the experiment was established by using SPSS software, and the grey B correlation analysis of the index gas and the correlation ratio with the temperature was carried out in the higher temperature stage, and the prediction gas for spontaneous combustion of coal sample was selected. The characteristics of spontaneous combustion of coal samples in No. 15 coal seam of Heshun Yiyuan Coal Mine are analyzed by using the above method, and the law of CO concentration accumulation in goaf of 1523 fully mechanized caving face is discussed by Fluent software. The results show that the critical temperature of oxidation temperature of coal sample is 95 ~ 105 鈩

本文编号：1933256