井下巷道内矿用防爆车CO排放分布规律数值模拟

Numerical Simulation of CO Emission by Flame- proof Vehicle in Underground Mine Tunnel

应用FLUENT模拟并与现场实测结果对比分析,研究矿用防爆车在井下巷道内CO排放及运移扩散规律。研究应用FLUENT模拟矿用防爆车以7 m/s的速度在风速为3 m/s的巷道内行驶时排放CO的浓度分布状况,得出t=1~5 s內矿用防爆车排出CO浓度动态分布,并得出监测静态点CO浓度变化规律,模拟结果表明,井下巷道内矿用防爆车排放CO气体浓度大于24×10^(-6)的区域位于车尾至车尾后6~7 m范围内,且在1 s内降低至小于24×10^(-6),车身前方CO浓度始终为19×10^(-6)。为了对比分析,在实际巷道内布置3个实测点进行CO浓度监测,实测结果验证了模拟结果的正确性。

FLUENT was used to simulate and comparatively analyze field test results in this paper in order to study the distribution and transport diffusion of CO concentration produced by mine flame- proof vehicle in underground tunnel,and to analyze the interference of CO emissions on coal spontaneous combustion forecasting and early warning underground. FLUENT was used to simulate the distribution of CO concentration when mine flame- proof vehicle run at speed of 7 m / s in underground tunnel while the inlet velocity was 3 m /s. Dynamic distribution of CO concentration discharged by mine flame- proof vehicle within t = 1 s to 5 s was obtained,and variation of CO concentration on static monitoring points was obtained at the same time. The simulation results showed that the region of CO concentration greater than 24 × 10^-6 was in the scope of car tailgate to the back 6 m to 7 m,and it reduced to less than 24 × 10^-6in 1 second. In front of car body,the CO concentration was always 19 × 10^-6. For comparative analysis,three monitoring points was arranged to monitor the CO concentration in actual underground tunnel. And the experimental results verified the correctness of the simulation results.