工作面动态推进下采空区煤自燃分布特征模拟

发布时间：2018-05-25 18:03

本文选题：工作面 + 氧化带　；参考：《中国安全生产科学技术》2017年10期

【摘要】：为了研究动态推进过程中工作面推进距离对采空区煤自燃分布特征的影响,采取及时有效的煤自燃防治措施,以13210综放面为工程背景,基于采空区渗透率分布公式和传热传质控制方程,建立采空区煤自燃数值解算模型。利用COMSOL软件模拟了工作面不同推进距离下以流速和氧体积分数为划分指标的采空区氧化带范围和高温区域的变化规律,分析了高温区域与氧化带的叠加效应。通过现场实测与模拟结果比对,验证了模拟的准确性。研究结果表明:采空区渗透率随着工作面推进距离的增加而不断变化,近工作面端渗透率变化不大,而中深部采空区的渗透率不断减小;采空区氧化带分布随工作面推进距离的增加呈现阶段性变化特征,推进初期氧化带范围不断变化,推进后期氧化带范围趋于稳定;采空区氧化带分布与高温区域重叠深度随工作面推进不断增加,最终稳定于工作面后方60~70 m范围内。
[Abstract]:In order to study the influence of working face advance distance on the distribution characteristics of coal spontaneous combustion in goaf during dynamic propulsion, timely and effective measures are taken to prevent coal spontaneous combustion, with 13210 fully mechanized caving face as the engineering background. Based on the permeability distribution formula and heat and mass transfer control equation in goaf, a numerical calculation model of coal spontaneous combustion in goaf is established. The variation of oxidation zone and high temperature zone in goaf with velocity and oxygen volume fraction are simulated by COMSOL software, and the superposition effect between high temperature area and oxidation zone is analyzed. The accuracy of the simulation is verified by comparing the field measurement with the simulation results. The results show that the permeability of goaf varies continuously with the increase of the working face advance distance, but the permeability of the middle and deep goaf decreases gradually. The distribution of oxidation zone in goaf varies with the increase of working face advance distance, the range of oxidation zone changes continuously in the initial stage of advance, and the range of oxidation zone tends to be stable in the later stage. The distribution of oxidation zone in goaf and the overlap depth of high temperature area increase with the advance of the working face and are stabilized in the range of 6070 m behind the working face.
【作者单位】：河南理工大学安全科学与工程学院;
【基金】：国家自然科学基金项目(51404090,U1361205,51574111)
【分类号】：TD752.2

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