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The riser of a dual fluidized bed gasification reactor heats bed materials by burning residual char particles coming from gasification part of the reactor. A validated Computational Particle Fluid Dynamic (CPFD) model is applied to simulate combustion of char particles in a riser of dual fluidized bed gasification reactor in a demonstration plant with 8 MW fuel capacity. The plant is located in Güssing, Austria. The three-dimensional model is used investigate combustion reaction as a function of the bottom, primary and secondary air feed rates. The results show there is a still possibility to improve combustion reaction by optimizing air feed rates, which can maximize the bed material temperature without increasing additional char particles feed.

Riser of Dual Fluidized Bed Gasi?cation Reactor: Investigation of Combustion Reactions