三维数字模拟技术在汽轮机低压汽缸汽密性设计中的应用

Analysis of the Seal Characteristic for LP Cylinder of Large Steam Turbine

随着大容量、高参数火电机组的不断发展,机组整体汽密性的设计对机组安全性和效率的影响变得越来越重要。将全三维非线性热固、流固耦合数值模拟技术引入到大型汽轮机机组低压汽缸及其部件的汽密性设计分析中,通过对结构的全新改进和优化解决了华能沁北电厂和大唐乌沙山电厂低压汽缸漏汽问题,提高了机组效率。

With the development of the emergence large-capacity, high-parameter thermal power unit, the higher economy and reliability is demanded. The widespread steam seal issue on thermal power unit seriously affects the safe operation and coal-fired efficiency of the steam turbine, and the steam leakage of the low pressure cylinder is more serious and frequent. The seal characteristic of the steam turbine cylinder （ blade ring, etc） was simulated using large-scale finite element software and CFD software in this paper. Through the improvement and optimization in the structure , huaneng qinbei power plant and datang wusha hill power plant LP cylinder steam leakage problems have been resolved , in addition it improve the efficiency of the unit. of the new solution.