本文關(guān)鍵詞： 指標(biāo)氣體 高抽巷 數(shù)值模擬 自燃“三帶”　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：火災(zāi)和瓦斯是制約煤礦安全、高效發(fā)展的兩大主要災(zāi)害,目前很多礦井采用高抽巷瓦斯抽采方法治理瓦斯超限,這種方法在治理瓦斯災(zāi)害的同時(shí)也對(duì)采空區(qū)漏風(fēng)場(chǎng)造成很大的影響,增加了遺煤自然發(fā)火的概率。因此,預(yù)防高抽巷抽采條件下采空區(qū)遺煤自燃,避免火災(zāi)事故的發(fā)生,具有重要而現(xiàn)實(shí)的意義。 針對(duì)防治高抽巷抽采條件下采空區(qū)煤炭自燃,本文從以下四個(gè)方面進(jìn)行研究： 首先通過(guò)采集劉莊礦13煤層三組煤樣并進(jìn)行低溫氧化實(shí)驗(yàn),根據(jù)實(shí)驗(yàn)結(jié)果優(yōu)選出13煤自燃早期預(yù)測(cè)預(yù)報(bào)的指標(biāo)氣體,并結(jié)合指標(biāo)氣體濃度與溫度的函數(shù)關(guān)系建立了多指標(biāo)氣體預(yù)測(cè)煤炭自燃體系。 通過(guò)理論分析采空區(qū)上覆圍巖的特性,分析了采空區(qū)孔隙率、滲透率在采空區(qū)的分布情況。利用Fluent流體模擬軟件,建立了高抽巷抽采條件下采空區(qū)氣體滲流模型,結(jié)合漏風(fēng)強(qiáng)度劃分出該條件下采空區(qū)自燃“三帶”的范圍。并分析了高抽巷抽采前后及高抽巷不同層位高度條件下,采空區(qū)自燃“三帶”范圍的變化。 通過(guò)在劉莊礦151305綜采面進(jìn)、回風(fēng)巷預(yù)埋束管和熱電偶,實(shí)測(cè)出采空區(qū)測(cè)點(diǎn)氧氣濃度和測(cè)點(diǎn)溫度,根據(jù)氧氣濃度和溫度劃分出采空區(qū)自燃“三帶”的范圍,結(jié)合數(shù)值模擬的結(jié)果,采用MIN-MAX方法優(yōu)化了采空區(qū)自燃“三帶”范圍并推算出了極限推進(jìn)速度。 最后根據(jù)研究結(jié)果結(jié)合151305綜采面的特殊性提出了高抽巷抽采條件下綜采工作面煤炭自燃防治技術(shù)。該論文的研究對(duì)高抽巷抽采條件下采空區(qū)遺煤自燃綜合防治有一定的指導(dǎo)意義。
[Abstract]:Fire and gas are two major disasters that restrict the safety and high efficiency development of coal mine. At present, many mines use high drainage roadway gas drainage method to control gas exceeding limit. This method not only has great influence on the air leakage field in goaf, but also increases the probability of spontaneous combustion of coal. Therefore, it can prevent the spontaneous combustion of coal in goaf under the condition of high extraction roadway, and avoid the occurrence of fire accident. Have important and realistic significance. In order to prevent coal spontaneous combustion in goaf under the condition of high pumping roadway extraction, this paper studies the following four aspects:. Firstly, by collecting three groups of coal samples from No. 13 coal seam in Liuzhuang Coal Mine and conducting low temperature oxidation experiments, the index gas for early prediction of spontaneous combustion of coal No. 13 is selected according to the experimental results. Combined with the function relationship between the concentration of index gas and temperature, the multi-index gas prediction system of coal spontaneous combustion is established. Based on the theoretical analysis of the characteristics of overlying surrounding rock in goaf, the distribution of porosity and permeability in goaf is analyzed. By using Fluent fluid simulation software, the gas seepage model of goaf under the condition of high extraction roadway extraction is established. Combined with the wind leakage intensity, the range of "three zones" of spontaneous combustion in goaf under this condition is divided, and the variation of "three zones" of spontaneous combustion in goaf is analyzed before and after extraction of high extraction roadway and under different height conditions of high extraction roadway. The oxygen concentration and temperature of goaf are measured in the 151305 fully mechanized coal face of Liuzhuang Mine, and the range of "three zones" of spontaneous combustion in goaf is divided according to the oxygen concentration and temperature. Combined with the results of numerical simulation, the range of "three zones" of spontaneous combustion in goaf was optimized by MIN-MAX method and the limit propulsion speed was calculated. Finally, according to the research results combined with the particularity of 151305 fully mechanized coal face, the prevention and control technology of coal spontaneous combustion in fully mechanized mining face under the condition of high extraction roadway extraction is put forward. This paper studies the comprehensive prevention and control of spontaneous combustion of coal left in goaf under the condition of high extraction roadway extraction. It has certain guiding significance.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD752.2

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本文編號(hào)：1530040