A mechanistic study of agglomeration in fluidised beds at elevated pressures

作者：Mansourpour Zahra; Mostoufi Navid^*; Sotudeh Gharebagh Rahmat

来源：Canadian Journal of Chemical Engineering, 2013, 91(3): 560-569.

DOI：10.1002/cjce.21680

• fluidised bed
• agglomeration
• discrete element method
• solid bridge
• elevated pressure

Effect of operating pressure on the hydrodynamics of agglomerating gassolid fluidised bed was investigated using a combination of discrete element method (DEM) for describing the movement of particles and computational fluid dynamic (CFD) for describing the flow of the gas phase. The inter-particle cohesive force was calculated based on a time dependent model developed for solid bridging by the viscous flow. Motion of agglomerates was described by the multi-sphere method. Fluidisation behaviour of an agglomerating bed was successfully simulated in terms of increasing the size of agglomerates. The results showed that increasing the operating pressure postpones de-fluidisation of the bed. Since the DEM approach is a particle level simulation and study about particleparticle interactions is possible, a micro-scale investigation in terms of cohesive force and repulsive force during agglomeration at elevated pressures was done. The micro-scale results showed that although the number of contacts between particles was decreased by increasing operating pressure, stronger solid bridge formed between colliding particles at higher pressures.

• 出版日期2013-3