Thermal imaging identification of coal and rock in northern China under thermal excitation——experiment and theoretical model

Abstract

ABSTRACT The identification of the coal and rock is an important part in the process of coal preparation. Thermal imaging is an effective way to identify coal and rock. However, the current research lacks in-depth studies of the theory behind experimental phenomena. To address the issue, the radiant temperature observation experiments in different coal and rock samples from typical coal mining areas in northern China under thermal excitation were conducted in this paper. The results showed that there was a significant difference in the magnitude of radiant temperature change between coal and rock, the mean radiant temperature of coal was 3.69 K higher than that of rock when heated for 3 min under heat source radiation conditions of 310 W/m2. Second, a quantitative model of coal and rock radiant temperature change was established, and the experimental verification demonstrated that the correlation coefficient between the experimental results and the theoretical inversion results reached 0.988. Finally, combined with the index of temperature sensitivity, a theoretical model for thermal imaging identification of coal and rock was constructed, which lays a theoretical foundation for the application of the technology in coal preparation.