(78e) Maintaining Microstructure during Scaling in Circulating Fluidized Bed Risers
AIChE Annual Meeting
Monday, November 14, 2022 - 9:12am to 9:30am
Two of the main reasons for failure are 1) changing fluidization regimes and 2) changing material properties that result in the material falling into a different Geldart group. Both are certain to change the microstructure and changes to the microstructure affect the interphase transport properties of the reactor system, namely the mass transfer and heat transfer. This work presents a new approach towards scaling based upon maintaining similitude at the microscale. It reviews a novel dimensionless flow regime map developed from analysis of the deterministic chaos parameters and higher order moments to ensure microstructure similitude. It then presents an example of using the scaling method to obtain operating conditions for a scaled-up laboratory reactor. Four scaling cases from the literature are examined to understand if the microstructure was maintained.