大功率汽轮机滑动轴承箱变工况性能研究

Study on Performance of Sliding Bearing Box of High Power Steam Turbine under Different Working Conditions

本文通过对某大功率汽轮机滑动轴承箱的受力情况进行简化理论建模,重点对稳定工况、变工况条件下轴承箱的受力进行分析,采用两种不同方法对轴承箱的变工况性能进行稳定性评估。基于有限元方法对轴承箱的空载工况、稳定工况以及变工况的刚性进行对比分析,结果表明稳定工况下的轴承箱弯曲静刚度和轴向静刚度均处于最高水平,且变工况会导致轴承箱静刚度水平显著下降。对变工况性能要求高的轴承箱而言,调整推拉键高度可以用于改善轴承箱刚性设计。

In this paper,through the simplified theoretical modeling of the bearing box of a high power steam turbine,the stress of the bearing box under stable and variable working conditions is analyzed,and the stability of the bearing box under variable working conditions is evaluated by using two different methods.Based on the finite element method,the rigidity of the bearing box under no-load condition,stable condition and variable condition was compared and analyzed.The results show that the bending static stiffness and axial static stiffness of the bearing box are at the highest level under stable condition,and the static stiffness of the bearing box under variable condition will significantly decrease.For bearing boxes with high performance requirements under variable working conditions,adjusting the height of push-pull keys can be used to improve the rigid design of bearing boxes.