本文選題：采空區(qū) + 煤自燃��； 參考：《西安科技大學》2013年碩士論文

【摘要】：煤自燃火災嚴重威脅著礦井安全生產，不僅能引發(fā)一些次生災害，還能造成巨大的資源浪費和財產的損失。綜放工藝的特殊性，使得較厚煤層“兩側”頂煤放出率較低，造成采空區(qū)遺煤較多，開放式的通風，使得漏風現象嚴重，容易引發(fā)火災。 采空區(qū)浮煤自燃是急需解決的問題，它直接影響礦井工作面的安全生產。本文以吉新煤礦11A601工作面為研究對象，從采空區(qū)浮煤的自身的性質及環(huán)境的影響出發(fā)，分析煤自然發(fā)火規(guī)律，劃分出煤自燃危險區(qū)域。首先采用XK-III型煤自然發(fā)火實驗臺研究煤自燃過程，測定煤自燃的放熱強度、耗氧速度，特征溫度和發(fā)火期等表示煤自燃程度的特性參數；其次通過現場觀測，，得到采空區(qū)浮煤厚度、氧氣濃度和漏風強度分布規(guī)律圖，依據實驗和現場的數據建立采空區(qū)滲流數學和物理模型,利用Fluent軟件對采空區(qū)流場進行數值模擬，得出采空區(qū)內的滲流速度和氧氣濃度分布規(guī)律；再次，利用自燃危險區(qū)域判定理論結合數值模擬以及現場觀測數據，得出采空區(qū)自燃危險區(qū)域范圍以及極限推進速度，為防滅火提供依據；最后，應用注氮防滅火理論，結合工作面實際情況，制定制氮方案，對采空區(qū)進行注氮防滅火工作，利用束管監(jiān)測，反饋并調整注氮參數，分析注氮防滅火的效果，以便更好的指導現場防滅火工作。
[Abstract]:Coal spontaneous combustion fire is a serious threat to mine safety, which can not only cause some secondary disasters, but also cause huge waste of resources and loss of property. Because of the particularity of fully mechanized caving technology, the caving rate of "both sides" top coal in thick coal seam is low, resulting in more coal left in goaf, open ventilation, serious air leakage phenomenon and easy to cause fire. Spontaneous combustion of floating coal in goaf is an urgent problem, which directly affects the safe production of coal face. This paper takes the 11A601 face of Jixin Coal Mine as the research object, starting from the nature of floating coal in goaf and the influence of environment, analyzes the law of coal spontaneous combustion, and divides out the dangerous area of coal spontaneous combustion. First, the spontaneous combustion process of coal is studied with XK-III coal spontaneous combustion test bench, and the characteristic parameters of coal spontaneous combustion, such as exothermic intensity, oxygen consumption velocity, characteristic temperature and ignition period, are measured. The distribution pattern of floating coal thickness, oxygen concentration and air leakage intensity in goaf is obtained. The mathematical and physical model of seepage flow in goaf is established based on experiment and field data, and the flow field in goaf is numerically simulated by fluent software. The distribution law of seepage velocity and oxygen concentration in goaf is obtained. Thirdly, the range of danger zone of spontaneous combustion in goaf and the limit propelling velocity are obtained by combining with numerical simulation and field observation data. Finally, applying the theory of nitrogen injection to prevent and extinguish fire, combined with the actual situation of the working face, the scheme of nitrogen production is formulated, and the nitrogen injection fire extinguishing work is carried out in the goaf, and the parameters of nitrogen injection are feedback and adjusted by the monitoring of the beam tube, the feedback and the adjustment of the parameters of nitrogen injection. The effect of nitrogen injection on fire prevention and extinguishing is analyzed in order to better guide the field fire prevention and extinguishing work.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD752

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