The effects of operation conditions and particle properties on wall erosion rate in CFB boilers were investigated by using two-fluid model approach by the commercial software Fluent 6.3.26.The wall erosion rate was calculated by the improved monolayer energy dissipation(MED)erosion model which was modified by the kinetic theory of granular flow(KTGF).The simulated results were compared with the available experimental data and numerical findings in the literatures for model validation.Then the effects of operation parameters such as gas superficial velocity

total bed inventory

particle diameter and density on the wall erosion rate were numerically studied.The results indicate that:the wall erosion rate increased with the fluidizing velocity and bed inventory;under the same operation conditions

smaller and lighter particles led to a higher erosion rate and more spacious erosion scope.