摘要
大型列管式空气预热器存在振动问题,通过流体数值模拟软件对其烟气、空气系统流场进行模拟、分析和计算,发现振动的原因主要是管束的卡门涡流频率与空气预热器固有气室频率在低温段符合产生共振条件、烟气流动不均匀等。通过加装隔板改变管箱与烟气腔体的固有气室频率成功消除振动,取得了良好的消振效果。
In order to solve the vibration problem of large- scale tubular air preheaters,the flow field of the flue gas and air system was simulated,analyzed and calculated with the fluid numerical simulation software. It was found that the vibration is mainly caused by the resonance due to the consistence of Karman vortex frequency and the natural frequency in the gas chamber of air preheater at the low temperature range,as well as inhomogeneous flue gas flow. Through installation of partitions to change the inherent frequency of air chamber in tube and flue gas chamber,the vibration was successfully eliminated,which achieved good results.
作者
林伟
Lin Wei(SINOPEC Zhenhai Refining ＆ Chemical Company, Ningbo, Zhejiang 315200)
出处
《石油化工技术与经济》
2016年第6期19-23,共5页
Technology & Economics in Petrochemicals
关键词
管式空气预热器
流场模拟
振动
自激振动
卡门涡流
气室固有频率
tubular air preheater
flow field simulation
vibration
self-excited vibration
Karman vortex
gas chamber natural frequency
