Numerical Study on Segregation Characteristics of Biochar in a Bubbling Fluidized Bed with Varying Aspect Ratio

In this study, computational particle fluid dynamic (CPFD) was applied to investigate the segregation characteristics of biochar in a bubbling fluidized bed. The aspect ratio of the bubbling fluidized bed was changed and the effects of aspect ratio on the segregation characteristics were investigated. In the present study, the segregation characteristics of a mixture of biochar and sand particles were analyzed in terms of pressure fluctuation, bubble size distribution, and mixing index. It was observed that as increasing the aspect ratio, the bubble size decreased which led to better segregation between biochar and sand particles. The mixing index of biochar and sand particles decreased as the aspect ratio increased. In addition, the effects of pyrolysis temperature on the physicochemical properties and structure of biochar were investigated.