锅炉一次风机周期性振动异常原因分析及处理

Cause Analysis and Treatment of Abnormal Periodic Vibration of Boiler Primary Air Fan

基于某一次风机的结构和工作原理,针对一次风机主轴承箱运行过程中出现振动趋势随环境温度变化周期性波动的问题进行剖析,采取振动监测、淋水试验、频谱分析等方法进行深入研究,利用排除法找到了一次风机主轴承箱运行过程中振动异常的根本原因。研究结果表明:一次风机混凝土基础被扰动导致混凝土基础整体强度不足,进而引发一次风机主轴承箱运行过程中振动异常并随环境温度变化出现周期性波动。通过对一次风机混凝土基础进行注浆加固,不仅使主轴承箱振动趋势随环境温度变化问题得到明显改善,而且一次风机主轴承箱运行过程中最大振动值由4.3降至2.6 mm/s,振动趋势显著降低并达到标准水平。

Based on the structure and working principle of a primary fan,the problem that the vibration trend of the main bearing box of the primary fan fluctuates periodically with the change of the ambient temperature during the operation was analyzed,vibration monitoring,water spray test,frequency spectrum analysis and other methods were taken to conduct in-depth research,and the root cause of abnormal vibration of the main bearing box of the primary fan during the operation was found by using the elimination method.The research results show that the disturbance of the concrete foundation of the primary air fan causes the overall strength of the concrete foundation to be insufficient,resulting in the abnormal vibration of the main bearing box of the primary air fan during the operation and the periodic fluctuation with the change of the ambient temperature.Through the grouting reinforcement of the concrete foundation of the primary fan,not only the vibration trend of the main bearing box with the change of ambient temperature has been significantly improved,but also the maximum vibration value of the main bearing box of the primary fan during operation has been reduced from 4.3 to 2.6 mm/s,so the vibration trend has been significantly reduced and reached the standard level.