Infrared measurement of temperature field in coal gas desorption

In order to reveal the temperature change in coal gas desorption process, the temperature variation in coal gas desorption process under different particle sizes is analyzed with infrared thermal imager. The infrared video signals obtained by the experiment are processed with SAT. Then the infrared radiation signals are processed by EMD with Hilbert–Huang and the infrared radiation noise is effectively removed. The research results show that the desorption process, with the change of the temperature, is an endothermic process. The coal absorbs heat when the gas is desorbed and the temperature drops. The coal body temperature drop range is obviously related to coal particle size. The smaller the particle size is, the bigger the temperature drop becomes. The temperature variation curves in the process of coal gas desorption under different particle sizes are fitted, and they comply with the exponential function. The research results lay the theoretical and experimental foundation for non-contact prediction on working face of coal and gas outburst with infrared thermal image technology.