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Char Conversion in Fluidized Bed Indirect Gasification

| 2017:393 | David Pallarès, Robert Johansson, Anton Larsson, Louise Lundberg, Henrik Thunman
This project brings new knowledge to the phenomenon of char conversion in indirect gasification, a technically proven process which provides highly efficient conversion of biomass and is thus considered a key factor in the phase out of fossil fuels.
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The combination of experimental and modeling work has yield new key knowledge on char conversion in indirect gasification systems, such as the possibility to influence char reactivity through fuel segregation (i.e. through fuel size), the strong effect on the gasification rate of having an active bed material instead of sand and the limited influence of the solids circulation on the fuel residence time when compared to that of the fluidization velocity. Scale-up simulation with the validated model developed show that the influence on char conversion of the solids circulation rate increases with scale, and that the residence time of char in the gasification chamber becomes a critical parameter to maximize at larger scales.

Char Conversion in Fluidized Bed Indirect Gasification | Energiforsk