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为研究《煤的甲烷吸附量测定方法(高压容量法)》(MT/T752-1997)标准中测试瓦斯吸附常数的吸附平衡时间(第1个点吸附平衡7 h,当压力大于0.5 MPa后每个压力点吸附平衡4h)是否能够使吸附能力强的无烟煤真正达到吸附平衡,通过COMSOL软件建立模型,模拟瓦斯在煤内的吸附扩散过程,从而研究无烟煤达到吸附平衡所需时间。研究表明,对于无烟煤,标准中规定的吸附平衡4 h并不足以使瓦斯完全吸附在煤的孔隙中,测试无烟煤的瓦斯吸附常数时,应延长其吸附平衡时间。对同一种煤(无烟煤)的软煤和硬煤,软煤的孔隙比硬煤发达,瓦斯若要进入更小的微孔隙内,分子扩散阻力越来越大,所需平衡时间越来越长,因此,在同一吸附压力下,软煤达到吸附平衡的时间比硬煤长。
In order to study the adsorption equilibrium time of gas adsorption constants tested in the “Methane Methane Absorption Measurement Method of Coal (High Pressure Volumetric Method)” (MT / T752-1997) standard (1st adsorption equilibrium point 7 h, A pressure point adsorption equilibrium 4h) whether the ability to adsorb anthracite adsorption capacity to achieve a true equilibrium adsorption, COMSOL software to establish a model to simulate the gas adsorption and diffusion process in the coal to study anthracite adsorption equilibrium time required. The study shows that for anthracite coal, the standard adsorption equilibrium for 4 h is not enough to make the gas completely adsorbed in the pores of coal. When testing the gas adsorption constant of anthracite coal, the adsorption equilibrium time should be prolonged. Soft coal and hard coal of the same coal (anthracite), soft coal than the hardened coal porosity, gas into the smaller pores, the molecular diffusion resistance is growing, the balance of time longer and longer Therefore, under the same adsorption pressure, soft coal reaches adsorption equilibrium longer than hard coal.