Effect of temperature and moisture on raw coal adsorption characteristics

Abstract：In order to study the effects of temperature and moisture ratio on raw coal samples’ adsorption characteristics towards coalbed methane and due to ack of researches of effects of temperature or moisture ratio on the adsorption capability of coal samples,coke coal from Tunlan Mine and the lean coal from Tunliu Mine were adopted.The original ones were processed from big block samples with size of 100 mm×150 mm,and the experimental results were fitted through Langmuir single molecule absorption model.The experiments begun from the measurement on absorption constants of the two sorts’of coal at equal temperature,and later different temperature and moisture ratio were regulated and determined the relationship of the absorption constants a ＆ b followed by temperature ＆ moisture ratio.The conclusion show that：the equal temperature experiments of coal samples with different metamorphose degree displays that absorption becomes much larger with the increase of metamorphose degree of coal;temperature is only related to absorption constant a.At the fixed temperature scope of these experiments,the relationship of absorption constant a by temperature is in linearity attenuation;in the range from dryness to saturation moisture,the relationship of absorption constant b by moisture ratio is in exponential attenuation.And the diversity of block coal sample and renew-shaped one on absorption characteristics was explained.