不同因素对煤岩导热系数影响的实验研究

Experimental Study on Effect of Different Factors on Thermal Conductivity of Coal and Rock

利用闪射法对不同孔隙率、密度、含水率及煤质的煤岩样导热系数进行测量,研究分析了这些因素对煤岩导热系数的影响及机理,并应用灰色系统理论对导热系数与影响因素进行灰色关联分析。结果表明:导热系数随孔隙率增大而总体呈变小的趋势,但并非单调递减;导热系数随密度增加呈近似线性规律升高;随煤岩样含水率上升,导热系数开始上升很快,后趋于平稳;孔隙率、密度、水分是影响煤岩导热系数的主要原因。

W e measured thermal conductivity of coal and rock samples with different porosity,moisture content,density and coal quality by the method of laser light scattering,and analyzed the influence of there factors on thermal conductivity of coal samples.We applied gray system theory to carry out grey relational analysis for thermal conductivity and influential factors.The results show that the coal thermal conductivity reduces totally with the increase of porosity,but does not monotonically; the thermal conductivity increases linearly with the increase of density; with the increase of moisture content of coal samples,thermal conductivity begins to rise rapidly and then leveled off; the primary influential factors of coal thermal conductivity were porosity,density and moisture.