不同因素对煤岩导热系数影响的实验研究
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摘要
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.
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.
引文
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[2]于珊,李顺群,冯慧强.土的导热系数与其干密度、饱和度和温度的关系[J].天津城建大学学报,2015,21(3):172-176.
[3]陈清华.松散煤体热物性测试及其温度场分布规律研究[D].淮南:安徽理工大学,2009:2-3.
[4]李建伟,葛岭梅,徐精彩,等.松散煤体导热系数测定实验[J].辽宁工程技术大学学报,2004,23(1):6-8.
[5]毛丹,陈沅江,吴超.热线法测定散体硫化矿石导热系数[J].金属矿山,2009(4):65-69.
[6]李守巨,刘迎曦,于贺.多孔材料等效导热系数与分形维数关系的数值模拟研究[J].岩土力学,2009,30(5):1465-1470.
[7]于明志,曹西忠,王善明,等.水分含量对土壤导热系数的影响及机理[J].山东建筑大学学报,2012,27(2):152-155.
[8]赵维平,王东.耐火材料导热系数的检验方法[J].耐火材料,2011,45(5):397-400.
[9]谭永波,韩继国,时成林,等.煤矸石材料对道路冻深影响的实验分析与实际观测[J].公路交通科技(应用技术版),2015(8):37-40.
[10]张婷,杨平.不同因素对浅表土导热系数影响的实验研究[J].地下空间与工程学报,2012,8(6):1233.