汽轮机中压进汽导流环温度场及变形分析

Analyses of Temperature Field and Deflection of Steam Turbine IP Inlet Flow Guide

中压进汽导流环是汽轮机中的关键部件,在设计过程中必须分析其温度场及变形。针对某亚临界600MW汽轮机导流环,建立了有限元模型,介绍了导流环表面不同区域的传热系数计算方法,用有限元法分析了导流环的温度场和变形,得出了在稳态运行工况的详细温度和变形分布。结果表明,导流环温度梯度以径向为主,导流环的最下部径向变形为1.611 3mm,导流环安装汽封处径向变形为2.063 6mm。所采用的分析方法可以用于分析亚临界、超临界和超超临界汽轮机导流环的温度场和变形,为导流环螺栓分析和冷却结构设计打下基础。

IP inlet flow guide is one of the key components in steam turbine, analyses of temperature field and deflection are important when flow guide of steam turbine is designed. Aim at a 600MW sub-critical steam turbine flow guide, a finite element model is developed, methods for calculating the heat transfer coefficients of flow guide surfaces different regions are described ,the finite element thermal and structural analyses are performed on the flow guide. Detailed temperature and deflection distributions are determined during the steady operating conditions. The results show that radial temperature gradient is principal,radial deflection of flow guide foot is 1. 611 3mm,radial deflection of flow guide with seal is 2.063 6 mm. The used analytic methods can be applied for temperature field and deflection analyses of sub-critical, supercritical and uhra-supercritical steam turbine flow guide, a basis for the bolting analysis and the cooling structural design of steam turbine flow guide is provided.