CHN Energy Xinjiang Kuangou Coal Mine Co. , Ltd.
CCTEG Shenyang Research Institute
State Key Laboratory of Coal Mine Disaster Prevention and Control
State Key Laboratory of Coal Mine Safety Technology

为减小深孔断顶爆破有害气体CO对判断煤自燃带来的影响,通过实验分析了宽沟煤矿所用乳化炸药爆炸所产生的主要有害气体,根据现场CO传感器监测数据研究了爆破后CO气体扩散机理,采用引排系统对爆破孔CO气体进行源头引排,并对引排系统参数进行优化,确定最优的引排流量及巷道供风量。研究结果表明:爆破后CO气体主要从爆破孔涌出,并在巷道形成炮烟团,导致监测数据中CO气体体积分数急剧变化;CO气体通过爆破孔、煤岩体裂隙、煤体脱附三种途径缓慢释放,加之炮烟中CO气体在采空区积存或吸附以及通风等因素,导致CO气体体积分数急剧变化后呈缓慢降低趋势;引排系统最多能缩短回风流CO气体超限时间38min,最大降低回风流CO峰值的45%;在不同巷道供风量和引排系统引排流量条件下,供风量为1400m3/min、引排流量为50m3/min时引排效果较好;提高巷道供风量会加快炮烟运移速率,缩短CO气体超限时间,但亦会对引排系统集气口产生一定影响。

To minimize the influence on coal spontaneous combustion with harmful CO from roof breaking blasting in deep opening, based on laboratory experiments, we analyze the main harmful gas produced by emulsion explosives used in Kuangou Coal Mine. We also analyze CO gas diffusion mechanism after blasting based on on-site CO sensor monitoring data. We employ discharge system to drain CO gas from the blasting hole, optimize the parameters of the drainage system, and determine the optimal drainage flow rate and roadway air supply volume. The research results indicate that after blasting, CO gas mainly gushes out from the blasting hole and forms smoke cluster in the roadway, leading to CO gas volume fraction sharp change in monitoring data. CO gas slowly released through blasting holes, coal rock fractures, and coal detachment. In addition, the CO gas accumulation or adsorption in the goaf, as well as ventilation and other factors, result in CO gas volume fraction sharp change first and then slowly decreasing. The drainage system, to the maximum extent, can shorten the return air CO gas overrun time by minutes and reduce the return air CO gas volume fraction peak by 45%. Under different conditions of roadway air supply volume and drainage system flow rate, the drainage effect is better when air supply is m / min and drainage flow is m / min. Increasing the roadway air supply volume can accelerate the blasting fume migration rate and shorten CO gas overrun time, but it will also have a certain impact on the drainage system gas collector port.

陈梦乔,杨伟,张海洋,等.超前深孔断顶爆破有害气体引排系统优化研究[J].煤炭工程,2024,56(12):83-88.