Experimental Research On Thermal Properties Of Coal And Rock

The main reason of thermo-harm is passing heat-harm to the air of the shaft and drift constantly by coal and rock seams. The ability to pass heat of coal and rock seams and thermal conductivity is closely related. Thermal diffusivity, specific heat and thermal conductivity are the basic parameters of thermal conductivity in coal and rock seams. It is important to measure characteristic parameters of conductivity for research of thermal environment in mine.This thesis is a part of NSFC "Research on Heat and Moisture Transfer of Gas-Liquid-Solid Three-Phase Coupled Between Original Rock and Air Flow and Formation Mechanism of Heat Harm In Deep Mining (51274115) ". Using NETZSCH LFA 457 Micro Flash, thermal diffusivity and specific heat of coal samples and rock samples selected from same coal mine were determined in different temperatures, thermal conductivity of coal samples and rock samples in different temperatures were calculated. Selecting same coal samples or rock samples, thermal conductivity of samples were determined in three conditions of original, infiltration water and drying. The experiment results show that thermal diffusivity and thermal conductivity of coal was much smaller than thermal diffusivity and thermal conductivity of rock. Thermal diffusivity and thermal conductivity of coal and rock are positive correlation with the reciprocal of temperature. Thermal diffusivity, specific heat and thermal conductivity of coal and rock increased with the increase of water content. Thermal conductivity of coal and rock decreased with the increase of density. The experiment obtains change law of thermal conductivity with different temperatures, water contents and density, it also provides experimental support for research of deep mine heat harm.