Abstract:

An outline for inner-loop studies in FCC fluidized bed is provided，including mainly baffle，vertical tube bundles and packing. The flow characteristics of both gas and solid in fluidized bed with various inner-loops are described，and the advantages and disadvantages of various types of inner-loop are discussed. The improvement process within the baffle and packing components is summarized，and the direction for future development is discussed according to the advantages and shortcomings in the existing structures of inner-loops.