块状型煤中甲烷的非等温吸附-解吸试验研究

Experimental Study on Methane Nonisothermal Adsorption on and Desorption from Block Briquette

为揭示煤中甲烷非等温吸附解吸规律,利用实验室试验方法,以块状型煤为研究对象,研究不同温度和压力下的甲烷吸附解吸过程。试验结果表明:相同温度条件下,随着压力的增高,吸附量增加并逐渐趋于平缓;同一压力下,解吸量小于吸附量,解吸出现滞后现象;相同条件下,型煤吸附量小于煤粉试样。不同温度区间,吸附解吸规律不同。在10～30℃,同一压力下,随着温度的升高,吸附量和解吸量下降幅度较大;在30～50℃,吸附量和解吸量出现先升高后降低的趋势,但变化幅度较小,温度变化对于吸附量和解吸量的影响较小。在10～30℃,温度是影响吸附解吸的主要因素。

In order to reveal the rules of non-isothermal methane adsorption and desorption in coal seam, an experimental study on methane nonisothermal adsorption on and desorption from a riquette sample was made. The results show that under the same temperature condition, the adsorbance increases with the pressure increasing, and tends to be stable gradually. Under the same pressure condition, the desorption quantity is less than that of adsorption, and hysteresis phenomenon occurs to the desorption. The adsor- bance of briquette sample is less than that of coal powder under the same conditions. In different tempera- ture ranges, the adsorption and desorption rules have some differences. In the range of 10 -30℃under the same pressure, the adsorption and desorption quantities reduce sharply with the temperature increasing. In the range of 30 -50℃, the adsorption and desorption quantities increase firstly and then reduce, however, the change range is narrow and the influence of temperature on adsorption-desorption is not obvious. In the range of 10 -30℃, the temperature is the dominating factor affecting adsorption-desorption.