双进口方形分离器气固流动特性的数值模拟  

Numerical simulation of gas solid characteristics in double inlet square cyclone separator

作　　者：刘汉周[1] 卢啸风[1] 黄永军 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]西南电力设计院,成都610021

出　　处：《重庆大学学报（自然科学版）》2011年第6期81-86,共6页Journal of Chongqing University

基　　金：国家'十一五'科技支撑计划资助项目(2006BAA03B02-06)

摘　　要：采用RSM湍流模型对双进口方形分离器的气相流场进行数值模拟,得到了分离器内的速度场和压力分布;同时采用拉格朗日模型对方形分离器内固体颗粒的轨迹进行模拟。结果表明:双进口方形分离器内速度场和压力场的对称性较好但气流旋转强度不大且容易衰减;不同粒径、不同位置入射的颗粒轨迹有较大差异,细颗粒入射时分离器内容易形成气流短路现象,颗粒靠近分离器顶部入射时分离器内容易造成上灰环现象,给方形分离器的分离效率带来了不利的因素。将方形分离器筒体的四角改为切形倒角,可以很好地改善分离器的流场,并能有效提高分离器分离效率。This paper uses RSM turbulence model to conduct the numerical simulation on the gas flow field in double inlet square separator and calculate the velocity field and pressure distribution in the seperator. At the same time, it simulates the solid particle trajectories in the separators using Lagrangian model. The results show that the velocity field and pressure distribution in double inlet square separator have good symmetry, but the flow swirl intensity is insufficient and easy to decay; different sizes and different injection locations bring significant differences for the particle trajectories; injecting small particles can be easy to form flow short-circuit phenomenon inside the separator, injecting particles near the top of separator can be easy to form top ash ring phenomenon inside the separator; these phenomena have adverse factors to the separation efficiency. When the separation cylinder corners of square separator are changed into cutting shaped chamfers, the flow field in the separator can be improved, and the separation efficiency of separator can be effectively improved.

关 键 词：循环流化床 双进口方形分离器 气相流动 颗粒轨迹 数值模拟 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]