循环流化床锅炉高压流化风机振动大分析

Analysis of Large Vibration of High Pressure Fluidization Fan in Circulating Fluidized Bed Boiler

针对某循环流化床锅炉高压流化风机在运行过程存在振动超标故障,检修多次发现电机端瓦轴承损坏,更换轴承后,该缺陷仍未能消除。通过多通道振动分析仪测量分析各轴承垂直振动趋势和各轴承垂直振动波德图发现:各测点振动大的主要原因为工频振动,各测点振动值呈现近乎周期性波动;设备在惰走过程,振动波动现象依然存在。根据该特征判断引起高压流化风机振动的主要原因为拍振现象,为降低该风机振动,在临近风机连接基础上,挖出5000mm长、100mm宽、200mm深的隔离区间。采用以上措施后,该高压流化风机振动状况明显改善,运行过程中各测点振动值小于2mm/s,风机可以长时间安全稳定运行。

Due to the excessive vibration fault of the high-pressure fluidization fan of a circulating fluidized bed boiler during operation,it was found that the motor end bearing was damaged several times during maintenance.After replacing the bearing,the defect was still not eliminated.By analyzing the vertical vibration trend and Bode diagram of each bearing through a multi-channel vibration analyzer,it is found that the main reason for the large vibration at each measuring point is power frequency vibration,and the vibration values at each measuring point exhibit near periodic fluctuations;During the coasting process of the equipment,vibration fluctuations still exist.Based on this feature,it is determined that the main cause of vibration of the high-pressure fluidization fan is the phenomenon of beating vibration.In order to reduce the vibration of the fan,an isolation interval of 5000 mm long,100 mm wide,and 200 mm deep was excavated on the basis of adjacent fan connections.After adopting the above measures,the vibration condition of the high-pressure fluidization fan has significantly improved,and the vibration value at each measuring point during operation is less than 2mm/s.The fan can operate safely and stably for a long time.