Segregation in a slugging FBC large-particle system

Properties of stationary (bubbling) fluidised beds relevant to combustion and gasification systems

“…Mixing and segregation in slugging fluidised beds have received much less attention. However, Schouten et al (1988) and Abanades et al (1994) extended the concepts of Gibilaro and Rowe (1974) to model the segregation of mixtures of coal and limestone in slugging beds. The mechanisms considered by Schouten et al (1988) were based on downward solids flow in gas slugs, upward solids flow in particle slugs and exchange between upward and downward moving solids flows.…”

“…However, Schouten et al (1988) and Abanades et al (1994) extended the concepts of Gibilaro and Rowe (1974) to model the segregation of mixtures of coal and limestone in slugging beds. The mechanisms considered by Schouten et al (1988) were based on downward solids flow in gas slugs, upward solids flow in particle slugs and exchange between upward and downward moving solids flows. Although the model of Gibilaro and Rowe (1974) assumes that the segregation term is associated with the dense phase, Yoshida et al (1980) considered it more likely to be associated with the wake phase.…”

Minimum fluidization velocity of binary mixtures

“…Umfmay be the best one, and ( U/UIvf) rather than ( U / Uhf) or ( U / U f ) is usually used as the diniensionless velocity by most investigators (Schouten et al, 1988;Ho et al, 1987;Carsky et al, 1986). From a practical point of view it may be said that the value of U,,fas well as U/,f and Uf is not very important.…”