1. History 1921.12. 16, Fritz Winkle observed the phenomena of fluidization and developed the gasifigator 1939. Warren Lewis and edwin gillil and discovered the technique of catalytic cracking with fast fluidization 1960s Douglass elliott began to use fluidized bed to produce steam
8 1 Characteristics of Gas-solid Two Phase Flow Rosin-Pammler formula R(dk)=exp(,/d) R(dK-weight percent of particle with d > dK n-index of non-evenness