A SIMPLIFIED MODEL FOR THE BEHAVIOR OF LARGE BIOMASS PARTICLES IN THE SPLASHING ZONE OF A BUBBLING BED
A model for the behavior of biomass particles in the splashing zone of a bubbling bed has been developed. The model is intended for use in CFD studies of bubbling beds, where it provides a way of modeling particle dispersion in the splashing zone. In the model, particles landing on the bed surface are assumed to reenter the splashing zone. Two initial velocities are used for the reentering particles: one represents particles landing on bursting bubbles and one for the emulsion phase. The fraction of the bed consisting of bubbles is calculated using standard expressions from the literature. The re-entering velocity of fuel particles from the bubbles is set such that the flight trajectory reaches the typical height of the splashing zone. The velocity from the emulsion phase is assumed to be of the order of the fluidization velocity. In both cases the initial direction of the trajectory is allowed to take random values. Using these simple assumptions an approximation of the logarithmic material distribution in the splashing zone is achieved.
CFD bubbling bed splashing zone
Anders Brink Oskar Karlstr(o)m Mikko Hupa
Faculty of Inorganic Chemistry, Abo Akademi University, Turku, Finland
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
764-767
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）