矿井爆炸灾后CO网域蔓延特征仿真研究

Simulation study on CO domain spreading characteristics after mine explosion

研究矿井瓦斯(煤尘)发生爆炸后毒害气体CO运移特征,有利于减少事故造成人员的中毒伤亡数。基于有源风网理论,同时运用矿井物理通风仿真TF1M3D平台,结合鸡西荣华一矿矿井,详细描述东部采区进风大巷一旦发生瓦斯爆炸,CO在全域矿井的运移过程及其浓度分布特征,并进行2种情况的仿真分析。研究得到,在爆炸残余热的作用下携带CO的风流会先产生逆流现象,若通风机初始为失效停机状态,在通风机恢复运转通风恢复正常后,CO运移和稀释得更快,到达相应位置的浓度更高,对工作面持续侵袭的时间短;若通风机处于失效状态,CO运移慢会产生聚集,较通风机失效停机状态下,CO到达相应位置的浓度低,对工作面持续侵袭的时间长;CO的浓度还与井下风流有一定的关系。仿真结果为矿井控灾减灾提供理论支持。

To study the CO migration characteristics of toxic gas after mine gas(coal dust)explosion is helpful to reduce the number of poisoning casualties caused by accidents.Based on the active air network theory,using the mine physical ventilation simulation TF1M3D platform and combined with the mine of Ronghua No.1 Mine in Jixi City,the migration process and concentration distribution characteristics of CO in the whole mine in the event of gas explosion in the air inlet roadway in the eastern mining area were described in detail,and the simulation analysis of the two cases was carried out.The simulation results showed that under the action of the explosion residual heat,CO carried by the airflow would first produce the countercurrent phenomenon.If the fan was initially in fault state,after the fan returned to operation and ventilation returned to normal,CO would migrate and dilute faster,arriving at each corresponding position with higher concentration and the continuous invasion time to the working face was short.If the ventilator destroyed,the CO would migrate slowly and accumulate,compared with the first case,CO would reach the corresponding position with low concentration and the continuous invasion time to the working face was long.The concentration of CO also had a certain relationship with underground air flow.The simulation results provided theoretical support for mine disaster control and reduction.