汽轮机甩负荷对转子寿命损耗的仿真分析研究  

Study on the Simulation of Rotor Life Loss after Unit Load Shedding

作　　者：王立健 何青[1] 李国庆 WANG Lijian;HE Qing;LI Guoqing(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《中国电力》2018年第10期150-155,共6页Electric Power

基　　金：国家自然科学基金资助项目(No.51276059)~~

摘　　要：由于外界电网的影响或机组自身故障的原因,火力发电机组会发生机组甩负荷等恶劣的运行工况问题。针对这一问题,提出了一种在机组甩负荷情况下对转子寿命损耗情况进行估算的实时评估方法。首先建立汽轮机的动态仿真模型,实现对汽轮机甩负荷过程的动态模拟,然后通过建立的转子寿命损耗分析模块实现对转子寿命损耗的估算,并应用于1 000 MW超超临界机组甩负荷的分析。当机组发生甩负荷时,机组转速迅速升高,对转子寿命的损耗随转速的升高而增加。结果表明,甩负荷动作必然导致汽轮机转子的寿命损耗;虽然单次甩负荷动作引起的汽轮机转子的寿命损耗较小,但是对于参与调峰的大容量机组的频繁甩负荷动作,对转子寿命的累积损伤是不可忽视的。因此,可以通过该方法对在运行的汽轮机转子进行实时监控,以确保机组在安全状况下稳定运行。Due to the influence of the external power grid or the fault of the unit itself,the units in a power plant may suffer from severe operating conditions such as load shedding.To solve this problem,in this paper,a real-time evaluation method for rotor's life loss is proposed by analyzing the unit load shedding process.First,the dynamic model of steam turbine is established to simulate the load shedding process;then the rotor life loss is estimated by the established rotor life loss analysis module,and is applied to analyze the load shedding of a 1 000 MW ultra supercritical unit.When the unit sheds a load,its speed increases rapidly,and the loss of the rotor life increases with the increase of the speed.The analysis results show that the load shedding will inevitably lead to the life loss of the turbine rotor.Although the life loss caused by a single load shedding is small,the cumulative damage to the rotor life of the large capacity regulation units which shed load frequently is significant.Therefore,the turbine's rotor can be monitored in real time by this method to ensure its stable and secure operation.

关 键 词：火力发电 汽轮机甩负荷 转子寿命损耗 动态仿真模型 评估方法 

分 类 号：TK263.7[动力工程及工程热物理—动力机械及工程]