火电厂中速磨煤机一次风道流场优化  

Flow Field Optimization of a Primary Air Duct for the Medium-speed Coal Mill of Thermal Power Plant

作　　者：王羽 韦红旗[1] 沈萌萌 Wang Yu;Wei Hongqi;Shen Mengmeng(School of Energy and Environment, Southeast University, Nanjing 210018, China;Nanjing SCIYON Automation Group Co., Ltd., Nanjing 211100, China)

机构地区：[1]东南大学能源与环境学院,南京210018 [2]南京科远自动化集团股份有限公司,南京211100

出　　处：《发电设备》2020年第1期14-19,共6页Power Equipment

摘　　要：为解决某电厂ZGM型中速磨煤机出口粉管浓度偏差大、一次风进口风量测量不准的问题,采用FLUENT软件对该机组冷、热一次风管道及磨煤机内部流场进行了数值模拟,并对一次风道及风量测量装置进行了优化调整。结果表明:优化后磨煤机一次风支管进口气流偏斜问题有所改善,一次风进口流场均匀性提高,风环出口截面流速偏差减小,系统阻力有所下降;新增风量测量装置测点数量较原测量装置显著增多,测量准确性显著提高。To solve the problems of large deviation of pulverized coal concentration at the outlet of a ZGM medium-speed pulverizer and the inaccurate measurement of inlet volume of primary air in a power plant,the flow field in the cold and hot primary air pipeline and in the pulverizer was simulated using FLUENT software,based on which,the primary air duct and the air measurement device were optimized and adjusted.Results show that the deflection of inlet air flow in the branch of coal mill primary air duct has been reduced,while the uniformity of inlet flow field of primary air improved,the velocity deflection at outlet section of wind ring reduced,and the system resistance lowered,after optimization of the primary air flow field.The number of measuring points in the new measurement device is significantly larger than that in the original one,which helps to improve the measurement accuracy remarkably.

关 键 词：磨煤机 一次风道 风环 

分 类 号：TK223.25[动力工程及工程热物理—动力机械及工程]