矿井复杂管网内有害气体的非稳态运移模型与实验研究

Unsteady migration model of harmful gas in complex pipe network of mine and the experiment verification

为了实现矿井复杂管网内瞬时有害气体浓度的快速预测,基于一维非稳定流动微分方程,建立瞬时有害气体在矿井风网内运移的动态弥散运移模型,分析了有害气体云团在巷道交叉点处的变化规律,提出利用稳态风网模拟计算结果结合Floyd路径规划算法对监测点有害气体浓度进行快速计算方法,同时利用大尺寸实验巷道模型开展示踪气体实验验证了数学模型的准确性。研究结果表明:瞬时释放的有害气体在巷道内的传播规律符合高斯分布模型,有害气体云团在复杂管网内的传播规律满足节点浓度叠加定律,实验测试SF;浓度峰值与模拟计算峰值最大误差为9.56%,预测峰值到达时间最大误差为3.88%。因此,仅考虑气体随流平移和弥散作用就能较好的预测有害气体云团在复杂管网内的运移特征,研究结果为矿井控风措施制定提供了技术支撑。

Based on one-dimensional unsteady flow differential equation, a dynamic dispersion migration model of instantaneous harmful gas in mine air network is established to rapidly predict the instantaneous harmful gas concentration in complex mine pipe network. The variation law of harmful gas cloud group at roadway intersection is analyzed. The accuracy of tracer gas model is verified using large-scale experimental roadway model. The results show that the propagation law of the instantaneous release of harmful gases in the roadway conforms to the Gaussian distribution model, while the propagation law of harmful gas cloud in complex pipe network satisfy the law of node concentration superposition. According to the experiment results, the maximum error between the peak SF6 concentration and the simulated peak is 9.56% and the maximum error of the predicted peak arrival time is 3.88%. Therefore, the migration characteristics of harmful gas cloud in complex pipe network can be predicted only considering the action of gas translation and dispersion with flow, and the research results provide technical support for the formulation of mine air control measures.