本文選題：含水采空區(qū) + 遺煤��； 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：朔南礦區(qū)麻家梁礦位于山西省朔州市朔城區(qū)境內(nèi),礦井設(shè)計產(chǎn)量12Mt/a,采用綜采放頂煤一次采全高回采技術(shù)。目前回采的4#煤層平均厚度9.8m,各工作面寬度均為250m,走向長度在2500m左右。由于采空區(qū)內(nèi)部空間漏風量大,回采后產(chǎn)生的遺煤較多,加之采空區(qū)常受到頂板涌水的影響,造成采空區(qū)內(nèi)部浸水后的遺煤自燃規(guī)律難以完全掌握,給礦井防滅火工作帶來極大困難。本文以麻家梁礦綜放開采工作面為工程研究背景,基于分析影響煤炭自燃的充分和必要條件,開展不同含水率情況下的遺煤自燃特性試驗、采空區(qū)自燃“三帶”分布規(guī)律平臺模擬實驗,通過現(xiàn)場考察,分析研判采空區(qū)內(nèi)部漏風和遺煤分布規(guī)律,旨在建立集“火災(zāi)預(yù)報——火災(zāi)預(yù)防——應(yīng)急滅火”三位一體的礦井綜合防滅火技術(shù)體系。主要研究內(nèi)容如下:(1)通過對不同含水率的煤樣進行程序升溫試驗,確定采空區(qū)遺煤在含水條件下的自燃特性,優(yōu)選出含水遺煤自燃指標性氣體,依此建立采空區(qū)自燃“火災(zāi)預(yù)報”體系;(2)利用采空區(qū)遺煤自燃“三帶”模擬實驗平臺,研究采場通風量大小與空間自燃“三帶”動態(tài)變化的相關(guān)性,分析工作面風量大小的改變與空間自燃“三帶”在橫向、縱向的范圍變化關(guān)系;(3)通過對割煤、放煤循環(huán)全過程連續(xù)觀測,分析采空區(qū)內(nèi)部實際遺煤分布狀態(tài);通過對工作面不同地點通風情況的現(xiàn)場測定,分析采空區(qū)內(nèi)部漏風區(qū)域分布情況。由此,確定出采空區(qū)遺煤自燃危險區(qū)域分布情況;(4)針對采空區(qū)內(nèi)部遺煤自燃危險區(qū)域分布,提出工作面端頭堆垛封堵墻技術(shù),減少向采空區(qū)內(nèi)部漏風,提出采空區(qū)注入氮氣技術(shù),降低采空區(qū)氧氣含量,為提高防滅火措施的有效性,提出低溫氮氣阻化細水霧技術(shù),由此建立采空區(qū)遺煤自燃“火災(zāi)預(yù)防”體系;提出采空區(qū)注液氮應(yīng)急防滅火技術(shù),結(jié)合礦井實際開采條件編制應(yīng)用方案,建立采空區(qū)遺煤自燃火災(zāi)“應(yīng)急滅火”技術(shù)。
[Abstract]:Majialiang Mine of Shuonan Mining area is located in Shuocheng District, Shuozhou City, Shanxi Province. The design output of the mine is 12 Mt / a. At present, the average thickness of coal seam is 9.8 m, the width of each face is 250m, and the strike length is about 2500m. Due to the large amount of air leakage in the inner space of the goaf, the large amount of residual coal produced after mining, and the influence of roof water on the goaf, it is difficult to grasp the spontaneous combustion law of the coal left after soaking inside the goaf. It is very difficult to prevent and extinguish the fire in the mine. Taking the fully mechanized caving mining face of Majialiang Coal Mine as the engineering research background, based on the analysis of the sufficient and necessary conditions affecting the spontaneous combustion of coal, the experiments on the spontaneous combustion characteristics of the residual coal under different moisture content are carried out. The distribution law of "three zones" of spontaneous combustion in goaf is simulated by the platform simulation experiment. Through field investigation, the distribution law of air leakage and residual coal in goaf is analyzed and judged. The purpose of this paper is to set up a comprehensive technical system of mine fire prevention and extinguishing, which integrates "fire forecast-fire prevention-emergency extinguishing". The main research contents are as follows: (1) through the programmed heating test of coal samples with different moisture content, the spontaneous combustion characteristics of coal left over in goaf under the condition of water cut are determined, and the index gas of spontaneous combustion of coal with water content is selected. Based on this, the "fire forecast" system of goaf spontaneous combustion is established. Using the "three zones" simulation experimental platform of spontaneous combustion in goaf, the correlation between the volume of ventilation in stope and the dynamic change of "three zones" in space spontaneous combustion is studied. This paper analyzes the relationship between the change of air volume and the horizontal and longitudinal range of the "three zones" of space spontaneous combustion. The distribution of the actual coal remains in the goaf is analyzed through continuous observation of the whole process of coal cutting and coal drawing cycle. The distribution of air leakage in goaf is analyzed by field measurement of ventilation in different working face. Therefore, the distribution of the dangerous area of coal spontaneous combustion in goaf is determined. In view of the distribution of dangerous area of spontaneous combustion of coal left in goaf, the technology of stacking and blocking wall at the end of the working face is put forward to reduce the air leakage inside the goaf. The technology of injecting nitrogen into goaf to reduce oxygen content in goaf is put forward. In order to improve the effectiveness of fire prevention measures, the technology of preventing water mist by low temperature nitrogen gas is put forward, and the "fire prevention" system of spontaneous combustion of coal left in goaf is established. This paper puts forward the emergency fire prevention and fire extinguishing technology with liquid nitrogen injection in goaf, and establishes the "emergency fire extinguishing" technology combining with the actual mining conditions of the mine to establish the "emergency fire extinguishing" technology for the spontaneous combustion of coal left behind in the goaf.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD752.2

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