超临界循环流化床旋风分离器结构优化数值模拟  

Numerical Simulation and Structure Optimization of Cyclone Separator in Supercritical Circulating Fluidized Bed

作　　者：赵立正 原奇鑫 康志忠[1] 郭永红[1] 孙保民[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《锅炉技术》2016年第3期31-37,44,共8页Boiler Technology

基　　金：国家科技支撑计划(2015BAA04B02)

摘　　要：当前我国正在大力发展超临界流化床锅炉,其关键部件旋风分离器在大型化及大尺度条件下的性能直接关系到整个机组的经济安全运行。针对某拟建电厂初设值,对旋风分离器排气管初设结构进行设计优化。对不同排气管直径,插入深度,偏置方向进行模拟研究。模拟采用RSM湍流模型,QUICK差分格式,SIMPLEC耦合方式,随机轨道模型,得到结构变化对分离器总压差和分级效率影响的一般性规律。引进分析综合因素Y=η/ξ(η为分级效率,ξ为阻力系数)将压差与分级效率综合考虑,使Y最大化。结果表明:直径为4.25m时,Y=3.17最大;插入深度为3.6m时,Y=3.17最大;偏于180°方向布置时,Y=3.38最大。排气管直径,插入深度设计合理,为进一步提高分级效率,降低压差可以进行排气管偏于180°方向布置。At present,our country is developing super critical fluidized bed boiler.Cyclone separator as the key components,in under the condition of large scale and large scale performance is directly related to economic and safe operation of the whole unit.Aiming at the initial value of a certain power plant,optimize the exhaust pipe of the cyclone separator.Simulate different exhaust pipe diameter,insertion depth and offset angle,using RSM turbulence model,QUICK difference scheme,SIMPLEC coupling method,random orbit model.Get the general rule of the influence of the structure change on the total pressure difference and the classification efficiency.Introduce and analyze comprehensive factors Y=η/ξ（ηis separator separation efficiency,ξis separator resistance coefficient）comprehensive consideration of pressure difference and classification efficiency,maximizing Y.Results show：When the relative diameter is 0.5,Y=3.17 is the largest;when the insertion depth is3.6m,Y=3.17 is the largest;in 180 degrees direction,Y=2.81 is the largest.Exhaust pipe diameter,insert depth design is reasonable.In order to further improve the separation efficiency and reduce the pressure,the exhaust pipe can be arranged in the direction of 180 degrees.

关 键 词：流化床 旋风分离器 数值模拟 排气管结构 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]