Sorption rate of CH4 and CO2 in coal at different pressure ranges

Mineral Engineering Conference

Lutynski, M.^1 ; Zavanella, L.^2

Silesian University of Technology, Faculty of Mining and Geology, ul. Akademicka 2, Gliwice

44-100, Poland^1

Brescia University, Department of Mechanical and Industrial Engineering, via Branze 38, Brescia

25123, Italy^2

关键词: Adsorption rates;    Desorption rate;    Different pressures;    Dynamic factors;    Lower pressures;    Pressure ranges;    Sorption equilibria;    Upper silesian coal basins;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/427/1/012039/pdf
DOI  :  10.1088/1757-899X/427/1/012039

来源: IOP

【 摘 要 】

The aim of this study was to verify the dynamic factor, that is the diffusion rate, which can directly affect the efficiency of CO2 injection and as a consequence - storage. A manometric setup was used for experiments on two hard coals from Upper Silesian Coal Basin in Poland. A model combining two firs-order rate functions with different rate constants was used to plot normalized equilibration curves. Diffusion curves were plotted at three pressure ranges 5-6 MPa, 3.5-4 MPa and 1.5-2 MPa. Result show that fast adsorption rate is higher at 5.5-6 MPa than at lower pressure range with highest fast adsorption rate fraction both for CH4 and CO2. Lower (1.5-2 MPa) pressure range allows achieving sorption equilibrium in less time for both gases. Diffusion rates are lower for CO2 than for methane the CH4 desorption rate has a slight impact on the CO2 adsorption and as a consequence CO2 storage capacity.