本文選題：注氮 + 氣體濃度��； 參考：《安徽理工大學(xué)》2013年碩士論文

【摘要】：本文利用數(shù)值模擬方法對不同通風(fēng)方式下及不同注氮條件下的采空區(qū)氧濃度場展開了研究。根據(jù)流體力學(xué)和多孔介質(zhì)的基本理論,建立了工作面與采空區(qū)統(tǒng)一流場的數(shù)學(xué)模型,運(yùn)用計(jì)算流體力學(xué)的方法,對采空區(qū)流場及注氮條件下的氧氣濃度分布規(guī)律進(jìn)行了模擬,通過模擬優(yōu)化了注氮參數(shù)。 在現(xiàn)場實(shí)測及理論分析的基礎(chǔ)上,分析了采空區(qū)孔隙率分布和氣體滲流阻力,采用試算法確定了采空區(qū)冒落煤巖的滲透率、孔隙率和粘性阻力等參數(shù)。根據(jù)氧濃度場劃分了采空區(qū)自燃“三帶”,研究了不同注氮方式下U型、U+L型和Y型通風(fēng)方式下的采空區(qū)自燃“三帶”范圍的變化特征,結(jié)果表明： (1)U型通風(fēng)方式下,隨著注氮量的增加,采空區(qū)自燃帶范圍逐漸縮小,自燃帶的位置越靠近工作面。注氮量180.12m3/h時(shí),為抑制遺煤自燃的最低值；注氮口位置距工作面10-30m時(shí),采空區(qū)自燃帶范圍較小,在25m～35m之間,反算得到的安全回采速度低于正常推進(jìn)速度(2m/d)；注氮口位置距工作面10m時(shí),自燃帶范圍最小,為25m。 (2)U+L型通風(fēng)方式時(shí),隨著注氮口位置變化,采空區(qū)自燃帶范圍也不一樣,注氮口位置距工作面30m時(shí),自燃帶范圍最小為31m,安全回采速度1.9m/d；隨著注氮量的增加,采空區(qū)進(jìn)風(fēng)側(cè)自燃帶寬度收縮明顯,而回風(fēng)側(cè)自燃帶寬度變化不大,注氮口位置距工作面30m時(shí)的最佳注氮量為180.12m3/h。 (3)Y型通風(fēng)方式時(shí),未注氮條件下的采空區(qū)自燃帶寬度達(dá)到82m,反算得到的安全回采速度約為3.6m/d。注氮量295.92m3/h時(shí),對于防止Y型通風(fēng)采空區(qū)自燃效果明顯；采空區(qū)的合理注氮口位置為20-30m,自燃帶范圍較小為29-32m,而注氮口位置20m時(shí),自燃帶范圍最小為29m。
[Abstract]:In this paper, the field of oxygen concentration in goaf under different ventilation modes and different nitrogen injection conditions is studied by numerical simulation method. According to the basic theory of fluid mechanics and porous media, the mathematical model of the unified flow field in the face and goaf is established, and the distribution of oxygen concentration in the goaf under the condition of nitrogen injection is simulated by the method of computational fluid dynamics. The parameters of nitrogen injection were optimized by simulation. On the basis of field measurement and theoretical analysis, the porosity distribution and gas seepage resistance in goaf are analyzed, and the permeability, porosity and viscosity resistance of caving coal rock in goaf are determined by trial calculation. According to the oxygen concentration field, the "three zones" of spontaneous combustion in goaf are divided, and the variation characteristics of "three zones" of spontaneous combustion in goaf under different nitrogen injection modes under U type U L type and Y type ventilation mode are studied. The results show that with the increase of nitrogen injection, the range of spontaneous combustion zone in goaf is gradually reduced, and the position of spontaneous combustion zone is closer to the working face. When nitrogen injection amount is 180.12m3/h, it is the lowest value to restrain the spontaneous combustion of residual coal, and when the position of nitrogen injection port is 10-30 m from the working face, the range of spontaneous combustion zone in goaf is relatively small, and the safe recovery speed between 25m~35m and 25m~35m is lower than that of normal advance speed of 2 m / d ~ (-1). When the position of nitrogen injection port is 10 m from the working face, the range of spontaneous combustion zone is the smallest, which is 25m 路2U L type ventilation mode. With the change of the position of nitrogen injection port, the range of spontaneous combustion zone in goaf is different, and when the position of nitrogen injection port is 30 m from the working face, With the increase of nitrogen injection, the width of the spontaneous combustion zone on the inlet side of the goaf shrinks obviously, but the width of the spontaneous combustion zone on the return side does not change much. The optimum nitrogen injection rate is 180.12m3 / h when the position of nitrogen injection port is 30m away from the working face. The width of spontaneous combustion zone of goaf under the condition of no nitrogen injection is up to 82m, and the safe recovery speed is about 3.6m/ d. When nitrogen injection amount is 295.92m3/h, the effect of preventing spontaneous combustion in Y-type ventilated goaf is obvious, the reasonable position of nitrogen injection port in goaf is 20-30m, the range of spontaneous combustion zone is 29-32m, and the minimum range of spontaneous combustion zone is 29m when nitrogen injection port is 20m.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD752.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 文虎,徐精彩,葛嶺梅,鄧軍;煤自燃性測試技術(shù)及數(shù)值分析[J];北京科技大學(xué)學(xué)報(bào);2001年06期

2 李宗翔;賈進(jìn)章;周志林;;工作面反風(fēng)時(shí)采空區(qū)場量分布變動的數(shù)值模擬[J];北京科技大學(xué)學(xué)報(bào);2010年06期

3 郝朝瑜;王繼仁;廉振山;任仲久;鄧存寶;;綜放采空區(qū)特性與氧濃度分布關(guān)系研究[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2011年03期

4 徐精彩,葛嶺梅,賀敦良;煤炭低溫自燃過程的研究[J];煤炭工程師;1989年05期

5 戴廣龍;綜采放頂煤工作面采空區(qū)漏風(fēng)與氧氣濃度分布規(guī)律研究[J];礦業(yè)安全與環(huán)保;2001年03期

6 蘭澤全;張國樞;馬漢鵬;;多漏風(fēng)采空區(qū)“三帶”分布模擬研究[J];礦業(yè)安全與環(huán)保;2008年04期

7 李宗翔,許端平,劉立群;采空區(qū)自然發(fā)火“三帶”劃分的數(shù)值模擬[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào);2002年05期

8 朱紅青;劉星魁;;采空區(qū)非間隔性注氮防火效果及施工參數(shù)[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年05期

9 李永存;林愛暉;王海橋;劉榮華;;風(fēng)流脈動下采空區(qū)流場數(shù)值模擬與實(shí)驗(yàn)研究[J];中國工程科學(xué);2008年02期

10 舒新前,朱書全,王祖訥,徐精求,葛嶺梅;神府煤煤巖組分的表面電位研究[J];中國科學(xué)E輯:技術(shù)科學(xué);1996年04期

相關(guān)博士學(xué)位論文 前1條

1 王紅剛;采空區(qū)漏風(fēng)流場與瓦斯運(yùn)移的疊加方法研究[D];西安科技大學(xué);2009年

，

本文編號：2027834