不同射流孔数流化床流动特性的数值模拟  

Numerical Simulation of Hydrodynamics Characteristics in Different Nozzle Count of Fluidized Bed

作　　者：谢一民[1] 李斌[1] 雷振寰[1] 杜艳玲[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《电力科学与工程》2012年第11期56-61,共6页Electric Power Science and Engineering

摘　　要：为研究不同射流孔数对流化床流动特性的影响,采用离散单元法对床内流动特性进行了数值模拟,分别模拟得到单孔、双孔分布板中气泡的形成、上升、破裂的过程,同时给出了不同入射流速对流动特性的影响。模拟结果表明:颗粒随气体的运动而运动,气体运动是颗粒运动的主要动力源,相对单喷口系统,由于相邻气泡之间存在横向和纵向双方向的聚并,挤压,破裂等现象,因此双喷口系统中床层内颗粒的运动和扩散作用也更加强烈。In order to research the effects of hydrodynamics characteristics of fluidized bed with different nozzle count, discrete element method was proposed to implement numerical simulation of Hydrodynamics characteristics in fluidized bed. By simtdation, the process of conformation, ascension and burst of bubble was obtained, the effect of hydrodynamics characteristics in different entrance velocity was also revealed. Numerical simulation re- sults show that particle move with gas, the motion of gas is the main power source of particle, relative to single- nozzle system, because of the mergence, extrusion and burst between congenial bubbles, the motion and the dif- fusion are more fierce in double-nozzles system.

关 键 词：流化床 喷孔 气泡 气固流动 离散单元法 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]