温度及含水率对切削原煤吸附瓦斯特性的影响

Effect of temperature and moisture on raw coal adsorption characteristics

为了测定温度、含水率对切削原煤吸附特性的影响,针对之前煤对瓦斯吸附性研究的不足,采用屯兰矿的焦煤、屯留矿的贫煤并经煤岩钻样机切削加工成100 mm×150 mm的圆柱形块状原煤,根据实验结果及相关理论采用Langmuir单分子层吸附模型进行结果分析。实验从等温条件下测定两种煤的吸附常数入手,之后调节至不同的温度和不同的含水率,测得吸附常数a、b分别随温度、含水率变化的关系式。结果表明:温度对吸附性的影响只取决于吸附常数a的变化,而含水率与b有关;在实验所研究的温度梯度内,得到吸附常数a随温度的变化呈线性衰减的趋势;在干燥到饱和含水的范围内,得出吸附常数b随含水率的变化呈指数衰减的趋势,并说明切削原煤的含水吸附性质与粉煤粒煤是存在差异的。

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.