摘要
采用商业软件Fluent 6.3.26中的双流体模型研究了不同操作条件和颗粒物性对流化床内壁面磨损速率的影响。基于颗粒动力学理论(KTGF)对单层能量耗散(MED)磨损模型进行改进,并对比验证了改进模型的准确性。采用该模型研究了表观流速、固体负载量、颗粒粒径和密度等不同操作条件对壁面磨损速率的影响。结果表明:壁面磨损速率随着表观流速和固体负载量的增加而增大;在相同的操作条件下,粒径较小和质量较轻的颗粒磨损速率较快,发生磨损的区域面积也相对较大。
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.
出处
《热力发电》
CAS
北大核心
2014年第7期66-71,76,共7页
Thermal Power Generation
