600MW轴流式一次风机振动大原因分析及处理  

Analysis and Treatment of the Causes of Large Vibration in Axial Flow Primary Fan

作　　者：孙德计 訾娟 SUN De-ji;ZI Juan(Guoneng Shenhua Jiujiang Power Generation Co.,Ltd.Hukou 332500,China)

机构地区：[1]国能神华九江发电有限责任公司,江西湖口332500

出　　处：《全面腐蚀控制》2024年第5期91-95,共5页Total Corrosion Control

摘　　要：在煤电机组“三改联动”背景下,锅炉需要频繁参与深度调峰运行。锅炉长期低负荷运行,给本体和辅机都带来一定影响。某电厂7#机组A轴流式一次风机大修后运行中振动超标,风机地脚振动在0.01mm范围内,风机壳体上的水平振动在2.7~2.8mm/s,但内部轴承箱的水平振动均在4mm/s以上,最大值出现在轴承箱一级动叶右侧水平向,振动烈度达到7.6mm/s,比同级轴承箱左侧的5.9mm/s偏差了近2mm/s,轴承箱二级动叶处的左右两侧水平振速分别为4.55mm/s和4.1mm/s。通过振动测试机分析,得出风机振动超标的根源是风机轴承箱的压紧力不足、转子存在不平衡量等,采取了增大轴承紧力,并进行现场动平衡,有效抑制了风机的振动,提高了一次风机的安全可靠性。Under the background of the“Energy saving and consumption reduction renovation,heating supply renovation,and unit flexibility operation renovation”of coal-fired power units,boilers need to frequently participate in deep peak shaving operation.The long-term low load operation of the boiler has a certain impact on both the main body and auxiliary equipment.After the overhaul of the A axial flow primary fan of Unit 7#in a certain power plant,the vibration exceeded the standard during operation.The foundation vibration of the fan was within the range of 0.01mm,and the horizontal vibration on the fan shell was 2.7~2.8mm/s.However,the horizontal vibration of the internal bearing box was all above 4mm/s.The maximum value occurred in the horizontal direction on the right side of the first stage moving blade of the bearing box,and the vibration intensity reached 7.6mm/s,which was nearly 2mm/s higher than the 5.9mm/s deviation on the left side of the same stage bearing box.The horizontal vibration velocities on the left and right sides of the second stage moving blades of the bearing box are 4.55mm/s and 4.1mm/s,respectively.After the overhaul of the A axial flow primary fan of#7 in a certain power plant,the vibration exceeded the standard during operation.Through vibration testing analysis,it was found that the root cause of the excessive vibration of the fan was insufficient compression force of the fan bearing box and imbalance of the rotor.Measures were taken to increase the bearing tension and conduct on-site dynamic balancing,effectively suppressing the vibration of the fan and improving the safety and reliability of the primary fan.

关 键 词：轴流式 一次风机 振动诊断 动平衡 

分 类 号：TK08[动力工程及工程热物理]