摘要
燃气/蒸汽联合循环机组中汽轮机启动时间较长,导致联合循环机组不能及时响应电网调峰需求。为此,通过数值实验和现场启动试验相结合的方法研究了汽轮机的启动过程。建立汽轮机转子二维轴对称有限元模型,确定非线性边界条件,通过数值模拟研究启动过程各暖机操作对转子应力的影响。基于数值实验分析结果,结合试验机组结构、运行特点,制定优化后的启动过程。温态启动时汽轮机转子最大应力降低11 MPa,启动时间缩短36 min,低周疲劳寿命损耗减少0.0008%;冷态启动时转子最大应力降低261MPa,启动时间缩短32min,低周疲劳寿命损耗减少0.0197%。
The starting time of the steam turbine in a gas/steam combined cycle unit is relatively long, which may cause the combine cycle unit fail to respond in time to the needs of peak and valley loads in the power network. Therefore, combining the methods of numerical experiments and field tests, the study on the starting process of steam turbine was conducted. A two-dimensional axisymmetric finite-element model of steam turbine rotor was established, and the nonlinear boundary conditions were determined, especially the impacts of warm-up operations on rotor stress were described in detail. Based on the numerical experimental results and considering the structure and operation characteristics of the pilot unit, the optimized start-up processes were made. Results show that for warm start-up, the maximum stress of the steam turbine rotor decreases by 11 MPa, the starting time is cut by 36min and the low cycle fatigue life consumption reduces by 0.0008%, respectively; while for cold start-up, the maximum stress decreases by 261 MPa, the starting time is cut by 32min and the low cycle fatigue life consumption reduces by 0.0197%.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第2期9-15,5,共7页
Proceedings of the CSEE
关键词
联合循环
汽轮机启动过程
暖机操作
转子应力
低周疲劳寿命损耗
combined cycle
steam turbine start-up process
warm-up operation
rotor stress
low cycle fatigue lifeconsumption
