Steam Reformer, natural gas is preheated and desulphurized before mixing with steam. Once mixed with the steam in the desired ratio, the natural gas undergoes catalytic reformation in Reformer to produce Carbon monoxide, Carbon dioxide and Hydrogen. The mixture then undergoes shift reaction to convert the CO into CO2. The mixture from here gets transferred to the PSA section to adsorb CO, CO2, CH4 and N2 (from purging) and produces pure Hydrogen. The desorbed gas from PSA can be used as fuel for combustion in the Reformer.