Axial segregation behaviour of a reacting biomass particle in fluidized bed reactors: experimental results and model validation

Axial segregation behaviour of a single biomass particle in lab-scale bubbling fluidized bed has been investigated from both experimental and modelling perspectives. Experiments were conducted using beech wood particles different sizes, ranging 8 to 12 mm under either oxidizing or inert conditions. The reactor was operated at temperatures fluidization velocity ratios, U/Umf, the range 500–650 °C 1–2, respectively. A one-dimensional model developed predict axial location over time, taking into account dynamic thermal conversion mechanisms. X-ray imaging techniques allowed identify endogenous bubbles released during devolatilization carry out direct measurements their size. This information used propose an expression for lift force acting on fuel particle. showed very accurate predictions appeared be independent nature fluidizing medium.