Analysis method of mine ventilation difficulty degree based on ventilation equivalent area
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摘要: 针对目前矿井通风难易程度评价中常用的等积孔不能有效反映通风难易程度细节、通风阻力测定不能很好地衡量复杂通风系统并联影响的问题，提出了一种基于通风等效面积的矿井通风难易程度精细化分析方法。该方法根据获取的巷道通风信息对通风系统进行网络解算，得到系统中各节点风压，并以各节点风压大小为依据对通风系统进行分段；每个分段中的巷道均为并联，按等积孔的特性，先计算各巷道的等积孔，综合获得各分段的等效面积，由此得到各节点对应的通风等效面积；为直观、清晰地表达通风系统各段的通风难易程度，用图形化的方式表示通风等效面积，包括风压-等效面积图、节点-等效面积图、风压-等效能耗图和节点-等效能耗图；根据通风等效面积图，对矿井通风难易程度进行通风“瓶颈”、阻力分布及通风能耗等精细化分析。实例验证结果表明，该方法能有效分辨出通风系统中的阻力较大区域、局部阻力位置及通风“瓶颈”位置，可服务于矿井通风的分析和优化。Abstract: In view of problems that equivalent orifice commonly used in current mine ventilation difficulty degree evaluation cannot effectively reflect details of ventilation difficulty degree, and ventilation resistance measurement cannot well measure effect of complex ventilation system in parallel, an refinement analysis method of mine ventilation difficulty degree based on ventilation equivalent area is proposed. According to obtained roadway ventilation information, the ventilation system network is solved to obtain wind pressure of each node in the system, and the ventilation system is segmented according to the wind pressure of each node. The roadways in each section are in parallel. According to characteristics of equivalent orifice, the equivalent orifice of each section are first calculated to obtain the equivalent area of each section comprehensively, so as to obtain corresponding ventilation equivalent area of each node. In order to visually and clearly express difficulty degree of ventilation in each section of the ventilation system, the ventilation equivalent area is represented graphically, including the wind pressure-equivalent area diagram, node-equivalent area diagram, wind pressure-equivalent energy consumption diagram and node-equivalent energy consumption diagram. According to the ventilation equivalent area diagrams, the mine ventilation difficulty degree is analyzed in detail including wind bottleneck, resistance distribution and ventilation energy consumption. The results of example validation show that the method can effectively distinguish resistance area and local resistance position and ventilation bottleneck location in the ventilation system, and it can be used for analysis and optimization of mine ventilation.
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期刊类型引用(8)
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