摘要
介绍了基于一阶惯性环节的高压转子温度场的计算原理和方法,推导了在控制系统中使用的简化迭代计算公式.针对1 000MW超超临界汽轮机,利用有限元法对其温度场进行了计算,验证了在热应力监控中使用高压内缸内壁温度等效代替高压转子外表面温度的合理性.采用一阶惯性环节法、差分法和有限元法等3种方法,对汽轮机高压转子冷态启动、温态启动、热态启动、极热态启动和滑参数停机过程的体积平均温度和转子中心温度进行了计算,并对比分析了3种方法的转子表面温差和转子中心温差的计算精度.结果表明:一阶惯性环节法的计算精度高且方便易用,可作为一种监控汽轮机转子温度场的有效方法.
The theory and calculation method of high-pressure rotor temperature field based on first-order inertia element were introduced, while the simplified iterative calculation formula used in the control system deduced. For a 1 000 MW ultra-supercritical steam turbine, its temperature field was calculated using finite element method, so as to verify the rationality to use the internal surface temperature of inner cylin- der instead of the outer surface temperature of rotor in thermal stress monitoring. The average volume temperature and center temperature of high pressure turbine rotor were calculated during the process of cold start, warm start, hot start, extreme hot start, and shutdown at sliding parameters by three methods, namely first-order inertia element, differential method, and definite element method, after which a comparison was made to the calculation precision of surface and center temperature difference of rotor a- mong above three methods. Results show that the first-order inertial element method has a high calculation precision and is easy to use, which therefore may be taken as an effective method for temperature filed mo nitoring of turbine rotors.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第8期586-590,共5页
Journal of Chinese Society of Power Engineering
基金
科技部科研院所技术开发研究专项资金资助项目(2011EG119151)
上海市青年科技启明星计划资助项目(12QB1401800)
关键词
汽轮机
热应力监控
温差
一阶惯性环节
差分法
有限元法
steam turbine
thermal stress monitoring
temperature difference
first-order inertial element
differential method
finite element
