温度对原煤与型煤渗流特性的影响分析
Effect Analysis of Temperature on Seepage Characteristics Between Moulded Coal and Raw Coal
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摘要: 利用自主研发的含瓦斯煤热流固耦合三轴伺服渗流装置,在有效应力保持恒定的情况下,分别测定了不同温度条件下型煤及原煤的渗透率,并比较了温度对2种煤样渗透率的影响规律。由于不同煤样的渗透率存在显著差异,为了消除个体差异,定义了温度敏感性系数,该系数可以反映煤样渗透率对温度的敏感性。通过温度敏感性系数的定义,进一步研究了2种煤样的渗透率对温度的敏感性的差异。研究结果表明,当有效应力一定时,2种煤样的渗透率均随着温度的升高逐渐降低,变化规律近似服从负指数函数关系;在相同试验条件下,型煤的渗透率远大于原煤;当有效应力一定时,2种煤样的渗透率对温度的敏感性均随着温度的升高逐渐降低,原煤的渗透率对温度的敏感性高于型煤。Abstract: By using self-developed triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane, the permeability of moulded coal and raw coal under different effective stress are determined. Based on that, the effect of temperature on the two kinds of coal is discussed. For there are significant differences among the permeability of coal samples, temperature sensitivity coefficient is defined to eliminate individual differences, and temperature sensitivity coefficient can reflect the sensitivity of coal to temperature. Based on the definition, the sensitivity of the two kinds of coal to temperature is studied. The experimental results show that, if the effective stress is kept constant, the permeability of the two kinds of coal will decrease with the increase of temperature, and they approximately follow negative exponential function; the sensitivity of moulded coal and raw coal to temperature both decrease with the increase of temperature, and the sensitivity of raw coal to temperature is higher than that of moulded coal.
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