煤粒瓦斯解吸扩散规律实验

Research on diffusion of methane in coal particles

进行了不同粒径煤样、不同温度和不同吸附平衡压力条件下的等温吸附-解吸实验.通过对解吸实验前600s实验数据的甲烷解吸率和槡t线性拟合,并结合计算得到了煤粒甲烷的初始有效扩散系数和扩散动力学参数.结果表明:吸附平衡压力越大,初始有效扩散系数越大,瓦斯解吸率越大;温度越高,初始有效扩散系数和扩散动力学参数也越大;煤样的粒径愈大初始有效扩散系数愈大,而动力学扩散参数越小,相同解吸时间内的甲烷解吸率越小.通过Arrhenius方程得到了甲烷解吸扩散活化能的表达式,通过处理数据得到1#和3#煤样的解吸扩散活化能分别为14.38kJ/mol和9.99kJ/mol.

Some isothermal adsorption and desorption experiments of methane in coal particles with different radius under the different temperature and equilibrium pressure conditions were designed. A initial effective diffusion coefficient and the activation energy of diffusion were got through the linear fitting between the diffusion rate and the c/ of data, which was collected during the first 600 s of the tests. The results show that the bigger value of the equilibrium pressure, the bigger value of the initial effective diffusion coefficient and the diffusion rate of gas. The initial effective diffusion coefficient and the activation energy increase with the rise of temperature. The increase of coal particles radius could also promote the initial effective diffu- sion coefficient, but it cause the inhibition of the active energy. The amounts of diffusion acti- vation energy of specimen 1# and specimen 3# were got using Arrhenius＇s equation, which were 14.38 kJ/mol and 9.99 kJ/mol separately.