The micro fluidized bed reaction analyzer (MFBRA) developed by Institute of Process Engineering

Chinese Academy of Sciences has isothermal differential characteristics and is suitable for gas-solids fast reaction analysis

including the measurement of reaction rate and kinetic parameters. The instantaneously intensive particle mixing between trace sample in milligrams and high-temperature fluidized material is the essential condition to keep isothermal differential characteristics of the micro fluidized bed reactor. Therefore a three-dimensional numerical simulation based on the Eulerian multi-fluid model was performed for the micro fluidized bed connected with different gas jet structures. The instantaneous flow structures and quantitative mixing characterizations for different injector structures and locations were obtained. Experiments were conducted through measurements using high speed camera to capture the instantaneous solids flow pictures in the bed. Comparison revealed good qualitative agreement between experiment and simulation. The simulation results suggested that the injector should avoid the bending angle that confronted the injected gas with the fluidizing gas or left the trace sample in the injector.