【摘要】：采空區(qū)自燃火災(zāi)是井下重大災(zāi)害之一，也是礦山安全領(lǐng)域重點(diǎn)研究的問(wèn)題。由于現(xiàn)場(chǎng)監(jiān)測(cè)及相似模擬實(shí)驗(yàn)都存在難題，因而數(shù)值模擬成為研究采空區(qū)自然發(fā)火的主要手段。本文通過(guò)實(shí)驗(yàn)研究了氧濃度、粒度以及揮發(fā)份等對(duì)煤自燃的影響；分析了采空區(qū)內(nèi)的產(chǎn)熱與散熱規(guī)律，提出了采空區(qū)自然發(fā)火的能量遷移理論，實(shí)現(xiàn)了采空區(qū)最高溫度的理論預(yù)測(cè)；揭示了采空區(qū)自然發(fā)火的多場(chǎng)耦合機(jī)理與過(guò)程，建立了三維多場(chǎng)耦合數(shù)學(xué)模型；確定了四面體單元控制體的合理圈劃方案，提出了精度很高的有限體積法新算法；利用新算法離散自然發(fā)火模型，，編制了“采空區(qū)自然發(fā)火的三維仿真系統(tǒng)”，結(jié)合河?xùn)|礦31005工作面的現(xiàn)場(chǎng)參數(shù)，模擬得到了注氮前后的采空區(qū)自然發(fā)火情況，并分析了推進(jìn)速度、遺煤厚度對(duì)自然發(fā)火的影響；現(xiàn)場(chǎng)布線觀測(cè)了該采空區(qū)的溫度變化，結(jié)果表明注氮參數(shù)選擇合理，達(dá)到了防火目的；實(shí)測(cè)溫度與模擬溫度吻合較好，也說(shuō)明數(shù)值模擬結(jié)果較為可靠。該成果將能在采空區(qū)自然發(fā)火的預(yù)測(cè)預(yù)報(bào)以及防火技術(shù)參數(shù)確定等方面得到應(yīng)用。
[Abstract]:Spontaneous combustion fire in goaf is one of the major underground disasters, and it is also a key problem in the field of mine safety. Because of the problems in field monitoring and similar simulation experiments, numerical simulation has become the main means to study spontaneous combustion in goaf. In this paper, the effects of oxygen concentration, particle size and volatile components on coal spontaneous combustion were studied by experiments. The law of heat production and heat dissipation in goaf is analyzed, and the theory of energy transfer of spontaneous combustion in goaf is put forward, and the theoretical prediction of the highest temperature in goaf is realized. The multi-field coupling mechanism and process of spontaneous combustion in goaf are revealed, the three-dimensional multi-field coupling mathematical model is established, the reasonable delineation scheme of tetrahedral element control body is determined, and a new finite volume method algorithm with high accuracy is put forward. Using the new algorithm to discretize the spontaneous combustion model, a "three-dimensional simulation system for spontaneous combustion in goaf" is compiled. Combined with the field parameters of 31005 working face in Hedong Mine, the spontaneous combustion in goaf before and after nitrogen injection is simulated. The effects of propulsion speed and residual coal thickness on spontaneous combustion are analyzed. The temperature change of the goaf is observed by field wiring, and the results show that the nitrogen injection parameters are reasonable and achieve the purpose of fire prevention, and the measured temperature is in good agreement with the simulated temperature, which also shows that the numerical simulation results are more reliable. The results will be applied to the prediction and prediction of spontaneous combustion in goaf and the determination of technical parameters of fire prevention.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)（北京）
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TD752.2

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