不同变质程度烟煤的传热特性实验研究
Experimental study on heat transfer characteristics of bituminous coal with different metamorphic degrees
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摘要: 为了探究煤火发展规律，选取大柳塔煤矿长焰煤、兴隆庄煤矿气煤、丁集煤矿焦煤和王家岭煤矿贫瘦煤，采用激光导热仪FLA 457分析煤样在空气气氛中30～300 ℃内的比热容、热扩散系数和导热系数随温度的变化趋势，并采用灰色关联方法掌握灰分、水分等参数分别与煤比热容、热扩散系数和导热系数之间的相关性。结果表明：随着温度的升高，热扩散系数先减小后增大，比热容先增大后趋于稳定，导热系数先缓慢增加后快速增大，且大柳塔煤矿长焰煤的热扩散系数和导热系数最小，丁集煤矿焦煤的热扩散系数和导热系数最大，这是由于煤中挥发分、灰分及固定碳对煤热物性参数的变化贡献较大。Abstract: To investigate the development tendency of coal fires, the long-flame coal, gas coal, coking coal, and meager-mean coal from Daliuta Coal Mine, Xinglongzhuang Coal Mine, Dingji Coal Mine, and Wangjialing Coal Mine were selected, and the laser-flash apparatus FLA 457 was adopted to analyze the change of specific heat capacity, thermal diffusivity, and thermal conductivity of each coal under air atmosphere from 30 ℃ to 300 ℃. The grey correlation method was used to master the relation between basic parameters（moisture, ash, volatiles, and fixed carbon） and thermophysical parameters （thermal diffusivity, specific heat capacity, and thermal conductivity）. Results indicated that as temperature increased, the thermal diffusivity decreased and then increased, specific heat capacity rose and then tended to be steady, and thermal conductivity increased and then rapidly increased. Furthermore, the thermal diffusivity and thermal conductivity of long-flame coal from Daliuta Coal Mine were the smallest, but those of coking coal from Dingji Coal Mine were the largest, this phenomenon can be explained that the volatiles, ash, and fixed carbon in coal contribute greatly to the change of coal thermophysical parameters.
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