金属矿山斜坡道火灾烟气流动特性的数值模拟

Numerical Simulation of Flow Characteristics of Fire Smoke in Ramp of Metal Mine

针对金属矿山巷道布置特点及灾变后风流组分特性,采用k-ε双方程模型建立了多组元风流流动的数学模型,利用混合差分格式和基于同位网格的SIMPLE算法对斜坡道灾变后多组元风流流动进行了数值模拟。模拟结果表明,在模拟的巷道长度范围内污染物的体积分数均远大于国家标准,严重影响矿井的安全生产;其中联络巷下风侧斜坡道灾变的影响范围大于上风侧灾变,中段联络巷火灾对工作面的影响最为严重,高浓度污染物蔓延至整个工作面,是火灾防治的重点防范区域;灾变受风流的影响较大,灾变时期的风流控制是金属矿山火灾治理的重要方向。

Based on layout characteristics of tunnel of metal mine and fractional characteristic of air flow after catastrophe, mathematic model of multi-components wind flow was established by adopted κ-ε two-equation model, numerical simulation was done on multi-components wind flow after catastrophe of ramp by using hybrid scheme and SIMPLE algorithm based on collocated grid. Simulation results indicate that volume fractions of contamination in simulative tunnel length range are greater than national stand- ards, while it seriously affects safe production of mine; influences range of ramp catastrophe at downwind side of crossheading was large than upwind side catastrophe~, influences of middle plate crossheading fire to working surface was most serious, high concentration pollutants spread to the whole working surface, which is key precaution area of fire prevention ; influences of air flow to catastrophe are big, air flow con- trol at catastrophe period is the important direction of fire control of metal mine.