火电机组深度调峰下动叶可调轴流式引风机振动故障分析及处理  

Analysis and Treatment on Vibration Fault of Axial-flow Induced Draft Fan with Adjustable Rotor Blade in a Thermal Power Unit Under Deep Peak Regulation Condition

作　　者：宋铜铜 胡伟 宋亚军 张巍 郝向中 刘双白 SONG Tongtong;HU Wei;SONG Yajun;ZHANG Wei;HAO Xiangzhong;LIU Shuangbai(North China Electric Power Research Institute Co.,Ltd.,State Grid Jibei Electric Power Co.,Ltd.,Research Institute,Beijing 100045,China;Guoneng Guohua(Beijing)Gas Thermal Power Co.,Ltd.,Beijing 100020,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院华北电力科学研究院有限责任公司,北京100045 [2]国能国华(北京)燃气热电有限公司,北京100020

出　　处：《发电设备》2025年第2期126-131,共6页Power Equipment

摘　　要：火电机组锅炉引风机在深度调峰时的低负荷工况下流量及系统阻力与风机特性不匹配,风机振动对外界扰动及自身状态变化的敏感度较高。针对某动叶可调轴流式引风机在低负荷工况下的振动超限问题,根据其振动特征与振动处理的反馈效果,经故障排查后判断引风机叶轮上存在不平衡量导致工频振动大,支撑刚度不足及不对称导致2倍频振动大、风机振动随工况变化出现波动。通过现场动平衡降低不平衡量、加焊肋板和重新浇筑二次灌浆增加支撑刚度,最终将引风机各动叶开度下的振动控制在合理水平。The flow rate and system resistance are not matched with the characteristics of the induced draft fans in thermal power units under low load condition for deep peak regulation,leading to the vibration of fans is more sensitive to external disturbance and its own state change.To solve the problem that the vibration exceeded the limit of an axial flow induced draft fan with adjustable rotor blade under low load condition,according to the vibration characteristics and the feedback effect of vibration treatment,it is investigated that following reasons existed,such as a larger vibration in power frequency caused by an unbalance effect on the impeller of the induced draft fan,a larger vibration in frequency doubling and a fluctuation of fan vibration with the change of operation condition caused by the insufficiency and asymmetry of support stiffness.The vibration of induced draft fan with different openings of rotor blade has been finally controlled within a reasonable level through decreasing the amount of unbalance by field dynamic balancing test,adding welding ribs,and increasing the support stiffness with secondary grouting reconstruction.

关 键 词：火电机组 深度调峰 轴流式引风机 动叶开度 振动 2倍频 

分 类 号：TK223.26[动力工程及工程热物理—动力机械及工程]