U型通风上隅角瓦斯浓度分布及应用

发布时间：2018-07-05 20:41

本文选题：上隅角 + 采空区　；参考：《辽宁工程技术大学》2014年硕士论文

【摘要】：本文结合晋煤集团古书院矿15#煤3盘曲高瓦斯区域153302工作面采空区瓦斯的赋存及涌出的特征,应用多孔介质流体动力学、传热传质学和数值模拟等理论,现场测定采空区瓦斯的压力场、速度场和浓度场。研究采空区瓦斯的分布特性,根据能量守恒、质量守恒和动量守恒定律对工作面回采时采用的采煤工艺、15#煤的各基础参数、采空区瓦斯浓度场,风量情况等的分析计算,建立瓦斯流动的数学模型,按照采空区的形状和建立的瓦斯流动数学模型,采用完全非结构化网格的有限体积法对采空区瓦斯流动控制方程以及边界条件进行离散化,并用商业CFD软件Fluent对上隅角瓦斯浓度模拟；结合15#煤层基础参数的测定结果推导出上隅角瓦斯浓度的计算方程公式,经过对模拟结果和计算结果的分析得出153 302工作面实测回采时期上隅角瓦斯浓度在正常通风的情况下瓦斯浓度不会达到超限的临界值的问题,经与现场数据的对比,理论计算和软件模拟的结果都与其相吻合,进一步说明了上隅角瓦斯浓度计算公式的正确性。因此在古书院煤矿能通过数值模拟与公式计算得出上隅角瓦斯浓度的范围,能有效的为所研究矿井以后开采同一地质条件、同一水平,同一采区的其他工作面的瓦斯治理提供了科学合理的宝贵经验。
[Abstract]:In this paper, combined with the characteristics of gas occurrence and emission in goaf of 153302 working face in No. 15# coal of Guyuan Coal Mine of Jinmei Group Group, the theories of fluid dynamics, heat and mass transfer and numerical simulation of porous media are applied. The pressure field, velocity field and concentration field of gas in goaf were measured. The distribution characteristics of gas in goaf are studied. According to the conservation of energy, mass and momentum, the basic parameters, gas concentration field and air volume of coal mining process No. 15# adopted in mining face are analyzed and calculated. The mathematical model of gas flow is established. According to the shape of goaf and the established mathematical model of gas flow, the control equations and boundary conditions of gas flow in goaf are discretized by the finite volume method of completely unstructured grid. The commercial CFD software fluent is used to simulate the gas concentration in the upper corner and the formula for calculating the gas concentration in the upper corner is derived by combining the measurement results of the basic parameters of the 15 # coal seam. Through the analysis of the simulation and calculation results, it is concluded that the gas concentration in the upper corner of 153302 face will not reach the critical value of exceeding the limit under the condition of normal ventilation, and the gas concentration in the upper corner of 153302 face will not reach the critical value under the condition of normal ventilation, which is compared with the field data. The results of theoretical calculation and software simulation are in agreement with them, which further shows the correctness of the formula for calculating the gas concentration in the upper corner. Therefore, in Guyuan Coal Mine, the range of gas concentration in the upper corner can be calculated by numerical simulation and formula, and the same geological condition and level can be effectively obtained for the mine under study. The gas treatment of other working faces in the same mining area provides scientific and reasonable valuable experience.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD712

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