煤导热系数影响因素的实验研究

导热系数是影响煤体热传导的重要参数。为了研究煤在不同温度及含水率条件下的传热特性，采用LFA457型激光导热仪，测试了不同温度、不同含水率条件下不粘煤、气煤两种煤样的导热系数，并采用邓氏灰色理论将煤导热系数与其内在影响因素进行灰色关联分析。研究结果表明：温度为-50～-30℃时，煤的导热系数快速减小；温度为-30～+10℃时，煤的导热系数快速增大；温度为+10～+50℃时，煤的导热系数呈缓慢增大趋势；随着煤含水率的增加导热系数开始快速增大，然后趋于平稳。灰色关联分析表明，煤内在因素中的固定碳、灰分、挥发分是影响煤导热系数的主要因素。

Experimental Study on Influence Factors of Thermal Conductivity of Coal

The thermal conductivity is an important parameter affecting the heat conduction of coal. In order to research the heat transfer characteristics of coal under the conditions of different temperatures and moisture contents, LFA457 laser thermal conductivity testing instrument was applied to measure the thermal conductivity of non-caking coal and gas coal under the conditions of different temperatures and moisture contents, and the influence of the internal factors of coal on its thermal conductivity was analyzed by using the Deng's grey theory. The results showed that when the temperature was -50℃ to -30℃, the thermal conductivity of coal decreased rapidly; when the temperature was -30℃ to +10℃, the thermal conductivity of coal increased rapidly; when the temperature was +10℃ to +50℃, the thermal conductivity of coal tended to slowly increase; and with the increase of the moisture content of coal, the thermal conductivity started to increase rapidly, and then tended to be stable. The grey correlation analysis showed that the fixed carbon, ash and volatile matter of coal were the main factors affecting its thermal conductivity.