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Effects of Different Pressures and Temperatures on the Gas Adsorption Characteristics of Coking Coal Based on
Xinshan Peng1, Guoxun Jing1, Lingling Qi1,2,3,4
1School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
Abstract:
As coal seam depth increases, high ground temperature and high gas pressure problems become prominent, especially in coal mining. This study investigates the effects of high-temperature and high-pressure conditions on the gas adsorption characteristics of coking coal in deep mining areas using the H-Sorb-2600 high-temperature and high-pressure gas adsorption instrument. The influence of pressure and temperature on adsorption properties was studied by using a two-factor variance method. The results show that (1) by applying temperature corrections to the Langmuir equation, a mathematical model was formulated to accurately describe the variation in the gas adsorption capacity of coking coal in deep mining areas under high-temperature and high-pressure conditions. (2) The new equation fits coking coal adsorption data under varying pressures and temperatures with a fitting degree exceeding 0.98. Predictions of adsorption amounts at any temperature and pressure show less than a 5% discrepancy between predicted and measured values. (3) In coking coal's gas adsorption performance, pressure dominates in lower temperature and pressure regions by the two-factor variance method. As the temperature and pressure rise, the effect of pressure on gas adsorption capacity diminishes, while the influence of temperature becomes more significant.
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