摘要
为优化反动式汽轮机的负荷变化能力,将机组的负荷变化率由运行规程规定的3.3 MW/min和6.6 MW/min分别提升至4.4 MW/min和9.9 MW/min,利用有限元软件,建立了某660 MW反动式汽轮机的高压转子的二维模型,对其负荷变化率优化前后转子的应力水平进行了有限元仿真分析。分析结果表明:负荷变化率优化后显著缩短了机组调峰所需时间;该机组在负荷变化时,高压转子的第5级叶根槽调端侧圆角处的应力值较大,负荷变化率优化后,该位置的最大应力由243.13 MPa提高至340.27 MPa,应力水平虽然升高,但仍低于材料的屈服极限,不影响运行安全,验证了负荷变化率优化的可行性。
In order to increase the load change rate of the unit from 3.3 MW/min and 6.6 MW/min specified in the operating regulations to 4.4 MW/min and 9.9 MW/min respectively to optimize the load change capacity of the reaction steam turbine,a two-dimensional model of the high-pressure rotor of a 660 MW reaction steam turbine is established and the stress level of rotor before and after load change rate optimization is simulated by finite element method.The analysis results show that the time required for peak regulation of the unit is significantly shortened after the load variation ratio.While the load of the unit changes,the stress value at the rounded corner of the fifth-stage blade root groove of the high-pressure rotor of the unit is relatively large.After the optimization of the variation rate,the maximum stress at this position increases from 243.13 MPa to 340.27 MPa.Although the stress level increases,but it is still lower than the yield limit of the material,and does not affect the safety of operation,which verifies the feasibility of optimizing the load variation rate.
作者
孟召军
艾涔
孟书宇
梁策
杨子健
张淏
Meng Zhaojun;AI Cen;Meng Shuyu;Liang Ce;Yang Zijian;Zhang Hao(College of Energy and Power,Shenyang Institute of Engineering,Shenyang 110136,Liaoning Province;College of Automation,Shenyang Institute of Engineering,Shenyang 110136,Liaoning Province)
出处
《沈阳工程学院学报（自然科学版）》
2023年第3期29-33,共5页
Journal of Shenyang Institute of Engineering:Natural Science
关键词
反动式汽轮机
负荷变化率
变工况运行
合成应力
有限元
Reaction steam turbine
Load change rate
Variable operating conditions
Synthetic stress
Finite element
