不同温压下柱状煤芯瓦斯吸附饱和度和进扩散时间的确定

发布时间：2018-04-21 11:01

  本文选题：瓦斯 + 柱状煤芯　； 参考：《中国安全生产科学技术》2017年07期

【摘要】：为研究温度压力对吸附饱和度和进扩散时间的影响,以确定实验室内不同温压下原煤煤芯可接受的吸附饱和度和进扩散时间,建立了柱状煤芯瓦斯扩散模型,采用φ50mm×100mm的柱状煤芯开展了不同温压下的瓦斯扩散实验。经实验检验,模型能很好描述原煤柱状煤芯的瓦斯扩散过程。计算了不同温压下柱状原煤煤芯达到不同吸附饱和度所需的吸附进扩散时间和不同时间的瓦斯质量浓度分布。结果表明:温度越高,扩散系数越大,吸附平衡时间越短;压力越高,扩散系数越小,吸附平衡时间越长。考虑实验精度要求和可接受时间,在30~40℃,瓦斯压力0.5~3MPa的范围内,建议渗流实验吸附饱和度为80%,吸附时间为6~8 d;精度要求较高的扩散实验,吸附饱和度为90%,吸附时间为10~12 d。
[Abstract]:In order to study the effect of temperature and pressure on adsorption saturation and inlet diffusion time, and to determine the acceptable adsorption saturation and diffusion time of raw coal core under different temperature and pressure in laboratory, a gas diffusion model for columnar coal core was established. The gas diffusion experiments under different temperature and pressure were carried out with 蠁 50mm 脳 100mm columnar coal core. Experimental results show that the model can well describe the gas diffusion process of the cylindrical coal core. The absorption diffusion time and gas mass concentration distribution at different temperature and pressure were calculated for the core of columnar raw coal to achieve different adsorption saturation. The results show that the higher the temperature, the greater the diffusion coefficient and the shorter the adsorption equilibrium time, and the higher the pressure, the smaller the diffusion coefficient and the longer the adsorption equilibrium time. Considering the requirement of experimental precision and acceptable time, in the range of 30 鈩，

本文编号：1782149