Abstract
Three tower (3-T) CFB biomass-coal co-gasification process by using CaO particles as circulating material was investigated with Aspen plus. The 3-TCFB co-gasification model was developed for expecting high efficiency. Process analysis results show that with coal/biomass supply ratio increased from 0 to 0.2, gasification cold gas efficiency was increased from 52% to 71%. A model combined gasification and FT synthesis was also produced to investigate the effect of FT off-gas recycle. With off-gas recycle from FT synthesis to the reformer of the 3-T CFB, cold gas efficiency can be up to 78% as well as liquid fuel product efficiency up to 53.9%.
