关键词: 温度-压力-吸附量方程, 变温变压吸附实验, 三维视图, 可视化, 平均相对误差

Abstract: Although the isothermal adsorption is studied by a large number of scholars and used to predict the reserves of coal bed gas, because the experimental conditions are not compatible with the ground temperature and ground pressure in the actual mining process, many experts have proposed to use the experimental conditions of variable temperature and pressure to predict the adsorption capacity of coal bed gas, but at present, there is not a good equation to deal with the variation of temperature and pressure experimental data. Based on the study of four different coal rank samples in variable temperature and pressure adsorption experiments by Zhang Qingling, Xi'an Branch of China Coal Research Institute, a temperature-pressure-adsorption equation (TPAE equation) is proposed for predicting the adsorption capacity of coalbed methane under the comprehensive influence of temperature and pressure. The adsorption capacity of four different coal ranks under variable temperature and pressure was predicted by the TPAE equation. The results showed that TPAE equation can deal with experimental data of variable temperature and pressure adsorption, and the measured values of the maximum average relative error is 2.64% to the regression values of four coal samples, the minimum is 1.63%, at the meantime, the visualization of the three-dimensional view of temperature and pressure and the amount of adsorption is realized, and the adsorption amount of coal gas under any temperature and pressure is known from the diagram.

Key words: temperature-pressure-adsorption equation, variable temperature and pressure experiment, three-dimensional view, visualization, average relative error