六高调门配置汽轮机进汽工况优化研究

Optimization Studyof Steam Inlet Condition of Steam Turbine with Six High Regulating Valves

针对亚临界300 MW汽轮机组进行建模与模态分析,可以得到汽轮机转子前两阶的固有频率与临界转速。对六高调门配置汽轮机的主要进汽工况进行说明并分析计算轴向气流力,利用Matlab软件对转子所受轴向力进行频谱分析,比较转子基频与固有频率,得到不同进汽工况下冲击力主频对各阶临界转速的避开率。研究结果表明:汽轮机转子在全周进汽工况下的稳定性与安全性最高,但流动损失较大,双对角进汽模式是最佳进汽模式。

Based on the modeling and modal analysis of subcritical 300 MW steam turbine unit,the first two natural frequencies and critical speed of steam turbine rotor are obtained.The main inlet conditions of the steam turbine equipped with six high regulating valves are described and the axial air flow force is analyzed and calculated.The spectrum of the axial force on the rotor under all working conditions is analyzed by using MATLAB software.By comparing the fundamental frequency and natural frequency of the rotor,the avoidance rate of the main frequency of the impact force to each critical speed under different inlet conditions is obtained.The results show that the steam turbine rotor has the highest stability and safety under the full cycle steam inlet condition,but the flow loss is large,and the double diagonal steam inlet mode is the best steam inlet mode.