摘要
为提高火电厂高温高压汽水管道的安全性,针对管道振动和动载荷引起的动应力进行理论研究,并对水击现象进行频谱分析,找出减小动应力的措施。以某电厂600 MW机组主蒸汽管道的汽锤现象为研究对象,通过建立有限元管道模型,对汽锤动载荷产生的动应力进行计算。结果表明,汽锤动载荷产生的动应力远远大于管道的静应力。通过积极治理管道振动现象,增设阻尼器来减弱动载荷的冲击作用,调整管系的固有频率来避开外界激振等措施,可实现减小动应力的目的。
To improve the security of the high-temperature high-pressure steam-water pipelines of thermal power plants, the theoretical study on the dynamic stress caused by vibrations and dynamic loads is conducted, and the spectrum analysis on the water hammer phenomenon is also studied to figure out the measures to decrease and optimize the dynamic stress. The water hammer phenomenon of the main steam pipe of a 600-MW power plant is used as the calculation object to compute the dynamic stress caused by the dynamic steam hammer loads through the establishment of the pipeline finite element model. The results show that the dynamic stress under dynamic steam hammer loads is much greater than the static stress of pipelines. The stress can be attenuated by controlling the pipeline vibrations actively, adding damper to decrease the effect of steam hammer and adjusting the inherent frequency of the pipelines to avoid the external excitation.
出处
《中国电力》
CSCD
北大核心
2016年第1期33-36,43,共5页
Electric Power
基金
吉林省教育厅"十二五"科学技术研究项目(2013109)
吉林省教育厅"十一五"科学技术研究项目(2008050)~~
关键词
火电厂
汽水管道
动应力
汽锤
power plant
steam-water pipeline
dynamic stress
steam hammer
