盲板力对架空布置循环水管道的影响

Influence of blind plate force on overhead circulating water pipe

为获得盲板力对循环水管道布置的影响,针对某联合循环工程,采用理论与数值相结合的方法研究了盲板力对架空布置循环水管道的影响。结果表明:90°弯头处流场不均匀对压力场分布的影响非常小,可以忽略不计;直径1420 mm、压力0.2621 MPa的循环水管道,盲板力非常大,达到约60 t;本文采用的循环水管道,在盲板力作用下位移和等效应力分布发生明显变化;支吊架荷载变化最大为3.6倍,盲板力对管道位移、应力分布和支吊架荷载的影响非常显著。本文研究结果可为大口径薄壁管道的分析、设计和布置提供参考。

In order to research the influence of blind plate force on layout of circulating water pipes,this article discusses the influence of blind plate force on overhead circulating cooling water pipes of a combined cycle power plant according to theoretical and numerical methods.The results indicate that,for 90°elbow,the effect of nonuniform flow field on pressure distribution is negligible.For the circulating cooling water pipes with diameter of 1420 mm and pressure of 0.2621 MPa,the blind plate force is very large,which reaches about 60 t.Under the action of blind plate force,the displacement and equivalent stress distribution change obviously.The maximum load increment of the support hanger is 3.6 times.The blind plate force has significant effect on displacement,stress distribution of the pipe and loads of the supports and hangers.The results of this paper could provide a reference for the analysis,design and layout of large-caliber thin-wall pipelines.