Simplified local-density modeling of pure and multi-component gas adsorption on dry and wet coals.

摘要

The Simplified Local-Density/Peng-Robinson (SLD-PR) adsorption model was utilized to generalize pure and mixed-gas adsorption predictions of methane (CH4), nitrogen (N2) and carbon dioxide (CO2) on ten coals (dry Argonne premium and wet OSU coals).;The SLD-PR model parameters were regressed to obtain representations for each coal and were then generalized in terms of adsorbent characteristics and methane excess adsorption at 400 psia. These generalized model parameters predicted the pure-gas adsorption on these coals with an overall weighted absolute average deviation (WAAD) of 1.1. Further, these pure fluid generalized parameters predicted most of the mixture adsorption on wet OSU coals within three times the experimental uncertainties.;Equation-of-State binary interaction parameters (BIPs) were incorporated to improve mixture adsorption predictions. The BIPs were regressed and generalized in terms of coal characteristics which resulted in the mixture adsorption predictions were improved to within twice the experimental uncertainties on average.