Impact of using calcium oxide as a bed material on hydrogen production in two-stage fluidized bed gasification

The gas composition was changed in the second stage fluidized bed gasifier because the re-heating environment for reaction of the syngas. When the calcium oxide was used as the bed material in the second stage, it enhanced the generation of H2 under most parameters. Highest H2 molar percentage in syngas was observed as 37 mol% at ER and S/B ratio is 0.3 and 2, respectively. Generally, more H2 generation through second stage gasifier was found than that in first stage by 6.1-12.8%.