This arrangement of three beds is shown going through the three basic steps and then a repressurisation stage. For simplification the process is shown separating CO2 from N2.
1. Feed – the flue gas goes into the adsorption bed, CO2 is adsorbed and N2 flows through.
2. Purge – CO2 is pumped back into the adsorption bed to flush out impure nitrogen trapped in spaces between the granules of the adsorbent.
3. Evacuate – the vacuum pump lowers the pressure and CO2 is removed from the chamber.
Repressurise – N2 flows back into the adsorption bed to re-pressurise the adsorption bed.
2. Purge – CO2 is pumped back into the adsorption bed to flush out impure nitrogen trapped in spaces between the granules of the adsorbent.
3. Evacuate – the vacuum pump lowers the pressure and CO2 is removed from the chamber.
Repressurise – N2 flows back into the adsorption bed to re-pressurise the adsorption bed.
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