Study on rapid calculation model of CO2 compression factor for coal adsorption

Abstract

In order to study the optimal equation and fast calculation model of CO2 compression factor suitable for coal adsorption among 6 kinds of gas state equations commonly used in engineering, such as Virial, V-d-W, R-K, S-R-K, P-R and Tongjingshan, three coal samples with different metamorphism degrees were taken as research objects. The CO2 adsorption capacity, CO2 adsorption constant and adsorption isotherm of coal obtained by using the above six equations at the test temperature of 30 ℃ were measured by volumetric method. The research shows that: compared with the CO2 compression factor provided by the National Institute of Standards and Technology (NIST), the maximum absolute error of CO2 compression factor obtained by Viral state equation is 0.38%. The adsorption isotherm has the highest goodness of fit; the absolute value error of the measured CO2 adsorption constant \begin{document}$a$\end{document} is the smallest, and the optimal gas state equation to determine the adsorption CO2 compression factor of coal is the Viral equation. At the same time, a simple and fast calculation model of CO2 compression factor is proposed when the test temperature is 30 ℃. After testing, the absolute error of the absolute value of the CO2 adsorption constant \begin{document}$a$\end{document} calculated by the US standard is less than 1%, and the operation is simple, fast and accurate.

Keywords

• co2 compression factor
• gas disaster
• viral equation of state
• co2 adsorption capacity
• co2 adsorption constant