Particle-particle drag is one of the most important influencing factors of the fluid dynamic behavior in a bubbling fluidized bed.Based on an Euler-Euler gas-solid two phase model,a particle-particle drag model considering particle slope coefficient of segregation is presented for simulation of the bubbling fluidized bed with two different sizes particles and a uniform gas inlet.Comparing the simulating results with Owoyemi's experimental and numerical results,it can be seen that the particle-particle drag model,considering the particle slope coefficient of segregation,can well predict and analyze the characteristics of particle segregation in the bubbling bed.

Abstract In practical engineering applications, the mixing and separation behavior of multi-component particles is importance to the fluidized bed operation. The development of many practical processes is inseparable from the knowledge of particle mixing and separation, such as material processing of ash-soluble coal gasification, multi-phase flow in boilers, and petrochemical catalytic processes. In recent years, due to the obvious advantages of the Eulerian–Eulerian model, many researchers at home and abroad have used it to study the mixing and separation behavior of particles. The paper reviews the use of Eulerian–Eulerian model to study the mixing and separation of multi-component particles in fluidized beds. The Eulerian–Eulerian model describes the gas-phase and each of the individual particles as continuums. The mechanism of particle mixing and separation, the influence of different factors on the particle mixing and separation including differences in particle size and density, the differences in apparent air velocity, the differences in model factors are discussed. Finally, an outlook for the use of Eulerian–Eulerian model to study the mixing and separation behavior of three component particles and related research on the drag model between particles.

Simulation of Particle Segregation Behavior in Bubbling Fluidized Bed

Citations

Simulation of Particle Mixing and Separation in Multi-Component Fluidized Bed Using Eulerian-Eulerian Method: A Review

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