Thermal diffusivity research of loose coal under high/low temperature environment
YUE Gaowei
LEI Liupeng
WANG Zhaofeng
XIE Ce
KANG Bo
Abstract：Based on frozen core technology in coal seam,thermal diffusivity of loose coal in low temperature environment is an important parameter for studying the temperature variation law of coal during core drilling.The temperature variations of loose coal heat conduction are tested under high/low temperature environment,and unsteady-state heat conduction multiplication method is adopted to theoretically calculate and analyze thermal conductivity of loose coal with different particle size under high/low temperature environment.The results show that the environmental temperature and coal particle size both have important influence for temperature variation of coal,and thermal conduction properties have larger difference under different temperature and particle size.The specific heat capacity of coal increases with the temperature rising,and thermal conductivity of loose coal also increases with temperature rising,which change law can be expressed by Polynomial function.At the same temperature,thermal conductivity of loose coal is greater with the larger particle size.These results would provide theoretical basis for studying the coal temperature variation during the frozen core drilling.
Keywords：loose coalthermal conductivityunsteady-state heat conduction multiplication methodhigh/low temperature environment
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1-6 )