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Methane Diffusion Properties in Different Anthracite Coals
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DOI：10.1021/acs.energyfuels.6c00221.png)
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Abstract
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The diffusion properties of methane in coal are a key parameter for evaluating the effectiveness of coalbed methane migration and production. The study selected four anthracite samples for isothermal adsorption experiments under variable temperature and pressure conditions. Utilizing the isothermal adsorption data, the effective diffusion coefficient (D e) of methane was calculated. A Langmuir equation for D e was established, and relevant parameters were computed. Research indicates that the effective diffusion coefficient of methane under varying experimental conditions follows the Langmuir curve law. This allows for the calculation and fitting of the Langmuir effective diffusion coefficient (D eL). The calculated D eL for anthracite samples under varying temperature and pressure conditions range from 4.33 & times; 10-5 to 8.57 & times; 10-5 s-1. The diffusion property of methane in anthracite is closely and positively correlated with pressure, temperature, coal properties, and pore structure. A predictive model for calculating the D e in anthracite was established by integrating Langmuir parameters, pressure, temperature, coal properties and total micropore volume. This model combines multiple influencing factors of D e, providing a theoretical foundation and novel methodology for calculating diffusion properties in coal seams.
Keywords:
ADSORPTION CAPACITY
GAS-DIFFUSION
CH4
CO2
Journal
E
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