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.
Sorption rate of CH4 and CO2 in coal at different pressure ranges
Lucio Enrico Zavanella;
2018-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
