紅廟礦綜放工作面采空區(qū)自燃“三帶”研究
發(fā)布時間：2018-07-22 15:10
【摘要】：紅廟礦為二類自然發(fā)火礦井，煤層的自然發(fā)火期為20天，5-2S綜放工作面在推進的過程中有自然發(fā)火的可能。為了保證5-2S綜放工作面的安全推進，5-2S綜放工作面采空區(qū)防滅火任務是重點。本文研究的是通過現(xiàn)場實際防滅火工作和相應數(shù)值模擬分析進行紅廟礦5-2S綜放工作面采空區(qū)的防滅火治理。在5-2S綜放工作面采空區(qū)埋設三組束管，通過束管定期取氣樣，化驗分析得到采空區(qū)各組分氣體濃度。根據(jù)氧濃度數(shù)據(jù)繪制氧濃度分布等值線圖，利用氧濃度指標得出采空區(qū)自燃“三帶”，并算出不注氮和注氮時的合理推進度。利用Comsol軟件進行數(shù)值模擬分析采空區(qū)氧濃度分布和風流場，用上限漏風風速和下限氧濃度作為指標劃分采空區(qū)“三帶”，得出不注氮時氧化升溫帶的最大寬度為62m，工作面最小合理推進度為3.1m/d，注氮時氧化升溫帶的最大寬度為26.4m，工作面最小推進度為1.32m/d。將模擬的結果與實測結果對比，，驗證了模擬結果符合現(xiàn)場實際，可以指導防滅火實踐。在改變風量、注氮量、注氮口位置以及注氮時間的條件下分別進行數(shù)值模擬，得出各因素對采空區(qū)自燃“三帶”的影響規(guī)律∶風量變化對氧化升溫帶寬度影響不大，注氮量越大氧化升溫帶寬度越小，注氮口的合理范圍在30～50m，一天連續(xù)注氮16h為宜。本研究結果應用于指導紅廟礦5-2S綜放工作面采空區(qū)防滅火現(xiàn)場實際，保證紅廟礦5-2S綜放工作面安全采完畢，未發(fā)生火災。表明本研究對紅廟礦綜放工作面采空區(qū)防滅火具有重要的實際指導意義，對于其他煤礦采空區(qū)防滅火也具有借鑒作用。
[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.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD752.2
本文編號：2137863
[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.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD752.2
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