Pressure swing adsorption characteristics for coal-mine ventilation air

A comprehensive mathematical model of pressure swing adsorption (PSA) for separating and enriching coal-mine ventilation air methane (VAM) was established, which based on the mass and momentum conservation laws. A typical experimental process for VAM separation and enrichment in an axial-flow adsorption bed was numerically studied using active carbon pellets. The detailed distributions of gas concentration and adsorbance in the bed were obtained, and the calculated results are in good agreement with the experimental ones. The methane separation and enrichment processes in different cases were contrastively studied by varying the adsorption pressure, desorption pressure and desorption temperature to reveal the PSA characteristics for VAM separation and enrichment.