To make the system operable at a stable hearth temperature even when properties of wet biomass change by properly adjusting the travel of fluid medium which moves between a dry room and a combustion chamber in a wet biomass incineration system having an internal circulation fluidized bed incinerator.SOLUTION: A wet biomass incineration system comprises: a dry room and a combustion chamber; a fluid bed; a hearth supporting the fluid bed; a wet biomass incinerator in which an upper space of the fluid bed on the dry room side and an upper space of the fluid bed on the combustion chamber side are partitioned, and at least a part of the lower end has the hearth and a partition wall arranged in the fluid bed with a space therebetween; a first air box for supplying desiccant gas into the dry room; a second air box for supplying combustion agent gas into the combustion chamber; and a third air box arranged separately from the first air box and the second air box for supplying fluidization gas from below the fluid bed at a position vertically overlapping the space into the space.SELECTED DRAWING: Figure 1
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