基于CFD的高海拔矿山掘进面通风增氧方案优化

Optimization of aeration scheme with heading face ventilation in high-altitude mine based on CFD

以海拔3400 m金属矿山为例,基于CFD模拟软件,以矿山巷道内原有氧气质量分数提高5%为目标,设计正交试验,在“长压短抽”通风方式下,优化压入风筒放置高度,分析压入风筒与掘进面距离、供氧管与压入风筒出口水平距离、抽压比3个因素对氧气质量及分布规律的影响。研究结果表明:压入风筒、抽出风筒距掘进面分别为12,3 m,供氧管与压入风筒出口水平距离为6 m,抽压比为0.8时,氧气质量分数提高5%且分布情况达到最佳状态;对氧气分布影响最大的因素为压入风筒出口与掘进工作面的距离,在设置管道布置方案时应重点考虑。

Taking a metal mine with the altitude of 3400 m as an example,the orthogonal tests were designed based on the CFD simulation software with increasing the original oxygen mass fraction in the mine roadway by 5%as the object.Under the ventilation mode of“long pressing and short pumping”,the placement height of forcing duct was optimized,and the influence of the distance between pressing duct and heading face,the horizontal distance between oxygen supply tube and pressing duct outlet,and the ratio of pumping to pressing on the oxygen mass and distribution laws was analyzed.The results showed that when the distance between the pressing duct and pumping duct and the heading face was 12m and 3m respectively,the horizontal distance between oxygen supply tube and pressing duct outlet was 6 m,and the ratio of pumping to pressing was 0.8,the oxygen mass fraction increased by 5%,and the distribution condition reached the optimal state.The factor with the greatest influence on the oxygen distribution was the distance between pressing duct outlet and heading face,so it should be considered with emphasis when setting the pipe layout scheme.