Experimental Measurement Study on Temperature Variation in Gas Desorption Process

With infrared thermal imager, temperature variation in the process of coal gas desorption under different adsorbed gas was analyzed. The research result showed that the desorption process, with the change of the temperature, was an endothermic process. The coal absorbed heat when the gas was desorpted and it decreased the temperature of coal. The decrease ranges of coal body temperature caused by gas expansion and heat and endothermic desorption were different in gas desorption process. According to the size of the temperature decreased range, the order was CO₂＞CH₄＞N₂.The temperature variation curves in the prosess of coal gas desorption under different gas were fitted, it met the exponential function.