【摘要】：本文以流體力學、傳質學、多孔介質流體動力學等理論為基礎,結合石泉礦30101綜放采空區(qū)現(xiàn)場實際,運用FLUENT軟件,對埋管抽采條件下采空區(qū)瓦斯運移規(guī)律進行三維數(shù)值模擬研究。根據采空區(qū)冒落特征的一般規(guī)律,研究了采空區(qū)空隙率與滲透率的分布形式,給出了其呈“O”型圈分布的半經驗公式；通過連續(xù)性方程、運動方程、擴散方程以及狀態(tài)方程來構建基本方程組,建立了采空區(qū)混合氣非線性滲流流態(tài)下的數(shù)學模型；對于該微分方程組,運用有限差分法(FDM)得到它的離散化方程組,引用交錯網格,采用SIMPLE算法進行求解；借鑒FLUENT6.3用戶指南中由Ergun公式推導粘滯阻力系數(shù)與慣性阻力系數(shù)公式的思想,對Bachmat多孔介質非線性滲流理論進行了分析,給出了采空區(qū)混合氣非線性滲流粘滯阻力系數(shù)與慣性阻力系數(shù)公式；用數(shù)值模擬的方法,對比研究了重力作用、采空區(qū)“導氣帶”高度以及煤層傾角各因素對采空區(qū)瓦斯?jié)舛确植嫉挠绊?得出在三維數(shù)值模擬中采空區(qū)瓦斯?jié)舛确植际鞘苓@三個因素共同影響的結論；同時考慮這三個因素的影響,較真實地反映出采空區(qū)瓦斯?jié)舛确植?對石泉礦30101綜放采空區(qū)埋管抽采條件下的采空區(qū)瓦斯運移規(guī)律進行了研究,得到了抽采口埋深、抽采流量各自與抽采瓦斯?jié)舛鹊暮瘮?shù)關系,從瓦斯抽采利用和抽采效果的角度出發(fā),給出采空區(qū)最佳抽采位置是抽采口埋深在25～35m范圍內,采空區(qū)埋管最優(yōu)抽采流量為17.1～18.4m3/min,為優(yōu)化采空區(qū)瓦斯抽采參數(shù)提供了理論依據。
[Abstract]:Based on the theories of fluid mechanics, mass transfer and fluid dynamics of porous media, combined with the field practice of 30101 fully mechanized caving goaf in Shi Quan Mine, FLUENT software is used in this paper. The gas migration law in goaf under the condition of buried pipe pumping is studied by three-dimensional numerical simulation. According to the general law of caving characteristics of goaf, the distribution forms of voidage and permeability in goaf are studied, and the semi-empirical formula of "O" ring distribution is given. The basic equations are constructed by the continuity equation, the motion equation, the diffusion equation and the state equation, and the mathematical model under the nonlinear seepage flow pattern of the mixture in goaf is established. For the differential equations, the discretization equations are obtained by using the finite difference method (FDM). The staggered grid is used to solve the differential equations, and the SIMPLE algorithm is used to solve the equations. Based on the idea of deducing viscous resistance coefficient and inertia resistance coefficient formula from Ergun formula in FLUENT6.3 user's guide, the nonlinear seepage theory of Bachmat porous media is analyzed. The formulas of nonlinear seepage viscosity resistance coefficient and inertia resistance coefficient of mixture in goaf are given. The effects of gravity, the height of "gas conduction zone" in goaf and the dip angle of coal seam on the distribution of gas concentration in goaf are studied by means of numerical simulation. It is concluded that the gas concentration distribution in goaf is affected by these three factors in three-dimensional numerical simulation. At the same time, considering the influence of these three factors, the gas concentration distribution in goaf is truly reflected, and the gas migration law in goaf under the condition of 30101 fully mechanized caving goaf in Shi Quan Mine is studied, and the buried depth of goaf is obtained. The functional relationship between the drainage flow rate and the gas concentration is given. From the point of view of the utilization of gas extraction and the effect of gas extraction, it is given that the best extraction position in the goaf is that the depth of the pumping mouth is in the range of 25 m. The optimal drainage flow rate of goaf buried pipe is 17.1 鈮，

本文編號：2492772