采空区多孔介质内流体传热研究
Study on fluid heat transfer in porous media in goaf
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摘要: 随着矿井开采深度不断增加，采掘工作面的高温热害日益严重，遗煤自燃现象尤为突出，严重影响矿井安全生产。为研究采空区多孔介质内流体传热规律，分析多孔介质传热影响因素，以姚桥煤矿7271工作面为例，建立采空区多孔介质模型，采用Fluent数值模拟方法模拟在不同风速、不同热源位置下采空区气体体积分数以及温度场变化。结果表明：随着风速不断增大，采空区自燃“三带”的范围不断向采空区深部移动，进风巷侧自燃“三带”影响范围较回风巷侧大；热源位置离进风巷越近，采空区整体温度越高，增大进风巷风速能有效降低采空区内部温度，降低多孔介质内流体传热效率。Abstract: With the increasing mining depth of the mine, the high temperature and heat damage of the mining face is becoming more and more serious, and the phenomenon of spontaneous combustion of residual coal is particularly obvious, which seriously affects the safety production of the mine. In order to study the heat transfer law of fluid in porous media in goaf and analyze the influencing factors of porous media heat transfer, a porous media model of goaf is established by taking the 7271 working face of Yaoqiao Coal Mine as an example, and Fluent numerical simulation method is used to simulate the changes of gas concentration and temperature field in goaf under different wind speeds and different heat source positions. The results show that with the increase of wind speed, the range of “three zones” of spontaneous combustion in goaf moves to the depth of goaf, and the influence range of “three zones” of spontaneous combustion in air inlet side is larger than that in air return side. The closer the heat source is to the air inlet tunnel, the higher the overall temperature of the goaf. Increasing the air inlet tunnel wind speed can effectively reduce the internal temperature of the goaf and reduce the fluid heat transfer efficiency in porous media.
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Keywords:
- goaf /
- porous media /
- heat transfer /
- numerical simulation /
- heat damage /
- spontaneous combustion
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