锅炉风道振动模拟分析

摘要

锅炉风道振动严重影响设备的安全运行,其中最常见的是由于气流脉动引起的风道共振.通过有限元模拟进行风道的固有频率分析和谐响应分析,得到风道结构的固有频率,以便在设计或改造过程中避开气流脉动频率从而避免发生共振.计算结果表明风道的固有频率分布密集时,难以通过加固风道的方式消减振动,需改善气体的流动状态.%The boiler's air duct vibration caused by the gas pulsation seriously influences equipment security.Through having FEM based to analyze harmonic response and intrinsic frequency of the air duct,the air duct's intrinsic frequency was obtained so that the gas pulsation frequency can be avoided in the design or in the air duct renovation.The calculation results show that,when dense distribution of the air duct's intrinsic frequency exists,reducing the vibration by reinforcing air duct only becomes difficuand improving the air flow state in the air duct has to be considered.