Numerical simulation of gas drainage with high position boreholes in goaf
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摘要: 依據Darcy定律,在Navier-Stocks方程的基礎上,對祁南煤礦綜采工作面采空區瓦斯抽放問題作了計算分析,并進行了CFD數值模擬.從理論上模擬采空區瓦斯聚集過程,直觀展示了瓦斯抽采時采空區流態、瓦斯分布變化.把抽放鉆孔布置在頂板裂隙內,結合上隅角埋管實施瓦斯抽放,該抽放瓦斯技術起到了對開采工作面上隅角瓦斯的截流作用,現場管路測量顯示,可抽出高濃度瓦斯達30%～80%(體積分數),工作面回風瓦斯的體積分數基本控制在0.3%以下.Abstract: Gas distribution and flowing in Qinan Mine were calculated and analyzed by means of the Navier-Stocks formula based on the Darcy law and then the method of CFD numerical simulation was used to visually display the result.The gas collection course in the falling porous media at the upper corner of goaf was simulated theoretically, which clearly illustrated the gas movement and flow pattern in goaf when the gas was drained.Based on the simulation result, the gas was drained through high-position boreholes placed in the fracture area in Qinan Mine, and it was proved to prevent the gas from flowing to the upper corner.As a result, piping measurements show, the gas concentration in the drainage pipeline reached to about 30% to 80% and the gas concentration of return air was lowered to as low as 0.3%.
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Key words:
- mining /
- goaf /
- boreholes /
- gas drainage /
- numerical analysis /
- simulation
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