Design of a H2 Pressure Swing Adsorption process at an advanced IGCC plant for cogenerating hydrogen and power with CO2 capture

A novel hydrogen pressure swing adsorptionsystem has been studied that is applied to an advanced inte-grated gasification combined cycle plant for cogeneratingpower and ultrapure hydrogen (99.99? mol%) with CO2capture. In designing the H2 PSA, it is essential to increase therecovery of ultrapure hydrogen product to its maximum sincethe power consumption for compressing the H2 PSA tail gasup to the gas turbine operating pressure should be minimisedto save the total auxiliary power consumption of the advancedIGCC plant. In this study, it is sought to increase the H2recovery by increasing the complexity of the PSA step con-figuration that enables a PSA cycle to have a lower feed flow toone column for adsorption and more pressure equalisationsteps. As a result the H2 recovery reaches a maximum around93 % with a Polybed H2 PSA system having twelve columnsand the step configuration contains simultaneous adsorption atthree columns and four-stage pressure equalisation.