基于双一阶函数组合模型的不同粒径颗粒煤瓦斯吸附动力学特征研究
Characteristics of Gas Adsorption Kinetics of Coal Particles with Different Sizes Based on Dual Combined First-order Rate Function
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摘要: 基于不同粒径颗粒煤的吸附实验,建立了双一阶函数组合模型,对煤对瓦斯的吸附过程进行计算分析。研究结果表明:煤对瓦斯的吸附过程是瓦斯在孔隙中的宏观迁移和微观连续吸附的组合,采用双一阶函数组合模型可以实现数据的完美拟合;随着粒径增大,甲烷吸附(快速和缓慢吸附过程)半衰期增大;煤颗粒粒径越小,煤对瓦斯的吸附越容易且吸附量越大。Abstract: In this paper, based on the adsorption tests of coal particles with different sizes, dual combined first-order rate function model is established to calculate and analyze the gas adsorption process of coal particle. The results show that the gas adsorption process in coal is a combination of macro migration and micro continuous adsorption in the pores, and the perfect fitting for test data can be achieved by using the dual first-order function combination model. With the increase of particle size, the half-life time of methane adsorption(fast and slow adsorption process)increases. The smaller the particle size is, the larger the adsorption capacity is under the same adsorption equilibrium pressure.
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