分离器转速对中速磨煤机风粉分配的影响  

Influence of separator rotation speed on air-powder distribution in medium-speed coal pulverizer

作　　者：屈子尧 陈敏[1] 姚啸林[1] QU Ziyao;CHEN Min;YAO Xiaolin(Xi’an Thermal Power Research Institute Co.,Ltd.Suzhou Branch,Suzhou 215153,China)

机构地区：[1]西安热工研究院有限公司苏州分公司,江苏苏州215153

出　　处：《热力发电》2024年第4期141-149,共9页Thermal Power Generation

摘　　要：针对磨煤机内部流场复杂且不均匀的问题,通过建立完整的中速磨煤机模型,采用CFD软件求解磨煤机内部流动方程,利用DPM迭代获取颗粒流动参数,探究了不同动态分离器转速下中速磨煤机内部流动情况和出口风粉分配特性。研究结果表明:一次风在磨煤机出口4根出粉管处分配特性较好且与试验结果相吻合;煤粉粒径较小时,4根出粉管的煤粉质量流量偏差较小,且随动态分离器转速提高变化不明显;随着粒径的增加,煤粉颗粒运动轨迹呈现为贴壁运动,4根出粉管的煤粉质量流量偏差逐渐增大;同时对于大粒径煤粉颗粒,随着动态分离器转速提高,4根出粉管煤粉质量流量偏差逐渐降低。Aiming at solving the problem of complex and uneven flow field inside the coal pulverizer,a complete model of medium-speed coal pulverizer was established.The CFD software was used to solve the internal flow equation of the coal pulverizer.Moreover,DPM iteration was used to obtain particle flow parameters,and the internal flow of the medium-speed coal pulverizer and distribution characteristics of outlet air-powder at different rotation speeds of dynamic classifier were explored.The results showed that,the distribution characteristics of primary air at four pulverizer outlets were good and consistent with the test results.When the powder diameter was small,the powder mass flow deviation at four pulverizer outlets was small,and the fluctuation was not obvious with the increase of the rotation speed of the dynamic classifier.With the increase of powder diameter,the motion trajectory of powder showed a wall adherent motion,and the powder mass flow deviation at four pulverizer outlets gradually increased.Furthermore,for coal particles with large diameters,with the increase of the rotation speed of the dynamic classifier,the powder mass flow deviation at four pulverizer outlets gradually decreased.

关 键 词：中速磨煤机 动态分离器 风粉分配 DPM 

分 类 号：TM621[电气工程—电力系统及自动化]