Variation in the temperature field of rocks overlying a high-temperature cavity during underground coal gasification

Mining Science and Technology (China) Pub Date : 2011-09-01 DOI:10.1016/j.mstc.2011.03.005

Luo Ji’an , Wang Lianguo , Tang Furong , He Yan , Zheng Lin

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引用次数: 19

Abstract

High temperature affects rocks in a way that changes the physical and mechanical properties of them. The temperature field in rock overlying a high temperature zone has been estimated using experimental research on thermal conductivity of the overlying strata. Numerical analysis software was used to estimate rock thermal conductivity at different temperatures. These estimates were then used with COMSOL Multiphysics to perform a numerical analysis with the heat conduction model. The results show that rock thermal conductivity decreases as the temperature increases and that various lithologies show similar behavior. The thermal conductivity of each rock type differs from the others at a given temperature. Exact values for the temperature distribution in the overlying strata during the process of underground coal gasification are obtained from the numerical simulation. The temperature in the rock changes with the height and direction from the gasifier. Temperature gradients vary for different types of rock. This result provides an important reference for further study of the strength of overlying strata subject to the process of underground coal gasification.

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煤地下气化过程中高温空腔上覆岩石温度场的变化

高温对岩石的影响会改变它们的物理和机械特性。通过对上覆地层导热系数的实验研究，估算了上覆高温区的岩石温度场。利用数值分析软件估算了不同温度下岩石的导热系数。然后将这些估计值与COMSOL Multiphysics一起使用热传导模型进行数值分析。结果表明:岩石导热系数随温度升高而降低，不同岩性表现出相似的行为;在给定的温度下，每种岩石的热导率不同于其他岩石。通过数值模拟得到了煤地下气化过程中上覆岩层温度分布的精确数值。岩石中的温度随着离气化炉的高度和方向而变化。不同类型的岩石的温度梯度各不相同。该结果为进一步研究煤地下气化过程中覆岩强度提供了重要参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Mining Science and Technology (China)

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