红庙矿综放工作面采空区自燃“三带”研究

发布时间：2018-07-22 15:10

【摘要】：红庙矿为二类自然发火矿井，煤层的自然发火期为20天，5-2S综放工作面在推进的过程中有自然发火的可能。为了保证5-2S综放工作面的安全推进，5-2S综放工作面采空区防灭火任务是重点。本文研究的是通过现场实际防灭火工作和相应数值模拟分析进行红庙矿5-2S综放工作面采空区的防灭火治理。在5-2S综放工作面采空区埋设三组束管，通过束管定期取气样，化验分析得到采空区各组分气体浓度。根据氧浓度数据绘制氧浓度分布等值线图，利用氧浓度指标得出采空区自燃“三带”，并算出不注氮和注氮时的合理推进度。利用Comsol软件进行数值模拟分析采空区氧浓度分布和风流场，用上限漏风风速和下限氧浓度作为指标划分采空区“三带”，得出不注氮时氧化升温带的最大宽度为62m，工作面最小合理推进度为3.1m/d，注氮时氧化升温带的最大宽度为26.4m，工作面最小推进度为1.32m/d。将模拟的结果与实测结果对比，，验证了模拟结果符合现场实际，可以指导防灭火实践。在改变风量、注氮量、注氮口位置以及注氮时间的条件下分别进行数值模拟，得出各因素对采空区自燃“三带”的影响规律∶风量变化对氧化升温带宽度影响不大，注氮量越大氧化升温带宽度越小，注氮口的合理范围在30～50m，一天连续注氮16h为宜。本研究结果应用于指导红庙矿5-2S综放工作面采空区防灭火现场实际，保证红庙矿5-2S综放工作面安全采完毕，未发生火灾。表明本研究对红庙矿综放工作面采空区防灭火具有重要的实际指导意义，对于其他煤矿采空区防灭火也具有借鉴作用。
[Abstract]:Hongmiao Coal Mine is a second-class spontaneous combustion mine. The spontaneous combustion period of coal seam is 20 days and 5-2S fully mechanized caving face has the possibility of spontaneous combustion in the process of propulsion. In order to ensure the safety of 5-2S fully mechanized caving face, it is the key task to prevent and extinguish fire in the goaf of 5-2S fully mechanized caving face. This paper studies how to prevent and extinguish fire in goaf of 5-2S fully mechanized caving face in Hongmiao Coal Mine through actual fire prevention and fire extinguishing work on the spot and corresponding numerical simulation analysis. Three groups of beam tubes were embedded in the goaf of 5-2S fully mechanized caving face. The gas concentration of each component in the goaf was obtained by analyzing the gas samples from the tube periodically. According to the data of oxygen concentration, the contour map of oxygen concentration distribution is drawn, and the "three zones" of spontaneous combustion in goaf are obtained by using oxygen concentration index, and the reasonable advance degree of non-nitrogen injection and nitrogen injection is calculated. The distribution of oxygen concentration and air flow field in goaf are simulated by Comsol software. The upper wind speed and lower limit oxygen concentration are used as indexes to divide the "three zones" of goaf. The results show that the maximum width of oxidation heating zone is 62 m, the minimum reasonable advancing degree of working face is 3.1 m / d, the maximum width of oxidation heating zone is 26.4 m and the minimum advancing degree of working face is 1.32 m / d. By comparing the simulation results with the measured results, it is verified that the simulation results accord with the field practice and can guide the fire prevention and extinguishing practice. Under the condition of changing the air volume, the position of nitrogen injection port and the time of nitrogen injection, the effects of various factors on the "three zones" of spontaneous combustion in goaf are obtained. The variation of air volume has little effect on the width of oxidation heating zone. The larger the nitrogen injection amount, the smaller the width of the oxidation heating zone, the reasonable range of nitrogen injection nozzle is 30 ~ 50m, and the appropriate nitrogen injection time is 16 hours a day. The results of this study are applied to the practice of preventing and extinguishing fire in the goaf of 5-2S fully mechanized caving face in Hongmiao Coal Mine, and to ensure that the 5-2S fully mechanized caving face of Hongmiao Mine is safely mined and there is no fire. It is indicated that this study has important practical guiding significance for preventing and extinguishing the goaf of fully mechanized caving face in Hongmiao Coal Mine, and it is also useful for other coal mine goaf to prevent and extinguish fire.
【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】：2013
【分类号】：TD752.2

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