Abstract
A new type of circulating fluidized bed gasifier, called “fluidized bed gasifier with triple-beds and dual circulation”, was proposed. The objectives of this work are to clarify the gasification characteristics of biomass by using a laboratory-scale hot model gasifier and to compare the characteristics of biomass and coal. The tested biomass is wood pellet. As a result, the cold gas efficiency of wood pellet is higher than that of coal. The wood pellet is easy to gasify because the volatile matter content in the pellet is considerably high. Additionally, the amount of H2 formed is higher than that of the CO formed in both conditions since the amount of H2 increases due to the partial cracking of absorbed tar in porous alumina particles. The proposed gasifier can make porous alumina particles absorb tar, which is formed by the pyrolysis reaction, efficiently.
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