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Gas Desorption of Different Particle Size Coal under the Effect of Electromagnetic Radiation

Many factors can influence coal gas desorption. In this paper, the impact of coal particle size on coal gas desorption under the effect of microwave radiation was mainly studied. Infrared (IR) spectroscopy and optical fiber sensor were used to on-line detect and the qualitative and quantitative analysis of the desorbed gas. The analysis results of the infrared spectrogram showed that under the effect of electromagnetic radiation (2450Hz, 1.5μT), different particle sizes of coal sample could desorb gas which contained carbon dioxide, carbon monoxide and methane. The comparison of gas content detected by optical fiber sensor indicated that coal particle sizes had a significant influence on coal gas desorption. When coal particle was between 100 and 200 meshes, the gas content reached up to 27.58 m3/t.