CFX-based numerical simulation of pipeline leakage of coal mine main gas drainage system
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摘要: 为了解大尺度煤矿瓦斯抽采主系统管道泄漏的特征和管道内瓦斯流动多物理场的演化规律，基于Ansys CFX开展了煤矿瓦斯抽采主系统三维数值建模及计算，研究了瓦斯抽采主系统管道不同泄漏位置、不同泄漏强度以及不同抽采泵站负压对抽采管道内瓦斯流动规律的影响，并通过煤矿现场监测数据验证了模型的可靠性。研究结果表明，泄漏强度和抽采负压是影响瓦斯抽采管道内部流场的重要因素，靠近瓦斯抽采主系统抽采泵站的泄漏点更容易被传感器系统所监测。研究成果有望为煤矿瓦斯抽采主系统管道泄漏事故安全防控提供技术支撑，并可帮助优化抽采管道泄漏事故安全防控资源配置。Abstract: To understand the pipeline leakage characteristics of the large-scale main gas drainage system in coal mines and the multi-physical fields of the gas flow in pipeline, a three-dimensional numerical model is developed based on Ansys CFX and the process of gas drainage pipeline leakage is investigated.The influence of different leakage positions, different leakage intensities, and different negative pressures of the pumping station on the gas flow in the gas drainage pipeline is studied.The results show that the leakage intensity and the negative pressure are the important factors affecting the internal gas flow field in the gas drainage pipeline, and the leakage occurring near the pumping station of main gas drainage system is prone to be captured easily.The results of this paper are expected to provide technical support for the safety prevention and control of pipeline leakage accidents in the main gas drainage system and also suggestions for the optimization of the allocation of safety prevention and control resources.
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Key words:
- gas drainage /
- pipeline system /
- pipeline leakage /
- numerical simulation
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图 3 瓦斯抽采主系统瓦斯流动稳态模拟结果
Figure 3. Steady state simulation results of gas flow in main gas drainage system
图 5 瓦斯抽采主系统速度云图及压力梯度
Figure 5. Velocity contour and pressure gradient table of gas pipeline
表 1 物理模型参数
Table 1. Table of physical model parameters
参数 设定值 ϕ820 mm高压抽采管道长度/m 1 324 ϕ630 mm高压抽采管道长度/m 990 泄漏口位置/m (-1 000，0，0.5)
(132.5，0，0.415)瓦斯温度/K 293 高压抽采管道直径/mm 820，630 泄漏口直径/mm 205.0，157.5 
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