新型弯扭叶片旋转煤粉分离器分离性能的冷态数值研究  

Cold-state Numerical Study on Performance of Rotary Type Pulverized Coal Classifier with Bowed-Twisted Blades

作　　者：闫顺林[1] 魏杰儒[1] 董标[1] 杨玉环[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,保定071003

出　　处：《动力工程学报》2013年第1期42-46,共5页Journal of Chinese Society of Power Engineering

摘　　要：根据MPS89k中速磨煤机直叶片旋转煤粉分离器结构,提出了一种新型变截面弯扭动叶的旋转煤粉分离器.利用Fluent软件对该分离器的综合性能进行了数值模拟,分析了不同叶片结构的综合性能,获得了转子动叶的最佳结构参数.结果表明:新型变截面弯扭动叶旋转煤粉分离器转子动叶的最佳扭转角度为25°,转子动叶最佳结构下的流场分布比较均匀,静叶两端气流回流减少,静叶底部冲刷和磨损程度减小,使用寿命延长;转子动叶最佳结构下的出口煤粉细度为1.39%,综合分离效率为95.83%,该分离器内部气固两相流场的通风阻力为1 174Pa,能够满足工程要求.Based on structural features of rotary classifier with straight blades for MPS89k medium speed pulverizer, a new rotary coal classifier with variable cross section and bowed-twisted rotor blades was pro- posed, to which numerical simulation was performed using Fluent software so as to analyze its comprehen- sive performance under different conditions of blade structures, and obtain optimum structural parameters of the rotor blade. Results show that for the new coal classier, the optimal twist angle of its rotor blade is 25°, in which case the flow field following the rotor blade is evenly distributed, the air return at both ends of the stator blade is reduced, the erosive wear at bottom of the stator blade is alleviated, and there{ore the survice life of the classifier will be elongated. Under the optimmum conditions of rotor blade structure, the outlet fineness of pulverized coal is 1.39 %, the comprehensive separation efficiency is 95.83%, the air re- sistance in solid-gas two-phase flow of the classifier is 1 174 Pa, which can satisfy the requirements of actu al engineering projects.

关 键 词：旋转煤粉分离器 新型弯扭叶片 流场分布 分离性能 数值模拟 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]