600MW汽轮机组再热主汽阀门阀杆的热胀及其影响  

Study on the Stem Heat Expansion and Its Influence of the Reheat Stop Valve in 600 MW Steam Turbine Unit

作　　者：时兵[1] 金烨[1] 

机构地区：[1]上海交通大学计算机集成制造研究所,上海200240

出　　处：《动力工程》2008年第4期573-578,共6页Power Engineering

基　　金：国家重点基础研究发展规划(973)资助项目(2006CB200303)

摘　　要：针对引进型600 MW汽轮机组再热主汽阀门的运动卡涩问题,利用有限元技术,对其关键装配部件进行了热-结构耦合分析.提出了阀杆的轴向不等齐热胀模型和运动间隙变化模型,通过实测数据及仿真对比验证了模型的合理性.基于ADAMS软件建立了以接触碰撞和磨损为特征的汽轮机再热主汽阀门机构的虚拟样机平台,并系统地研究了阀杆受热膨胀对阀门开关过程动态特性的影响,结果表明:阀门杆的热胀改变了阀杆运动间隙并进而导致阀门开关过程动态特性发生显著变化,这是导致阀门运动卡涩的重要原因之一.笔者还提出了改善阀门开关过程动态特性的建议性措施.The thermo-contact-structural coupling has been analyzed for the key subassembly of reheat stop valve based on the finite element analysis （FEA） method against the problem of stem sticking of introduced type reheat stop valve in 600MW steam turbine unit. Both axial uneven heated-expansion model and motion clearance variation model for the valve stem have been presented and the reasonableness of both models have been verified by means of the actual data and the simulation comparison. Based on ADAMS software, a virtual prototype platform of reheat stop valve featured by contact dynamics and abrasion was built. The influence of heated stem expansion against the dynamic characteristics during the open/close process of reheat stop valve has systematically been analyzed. The result shows that the stem heatexpansion has changed the motion clearance and resulted an obvious variation of valve dynamic characteristics during its open/close process, which is one of the most imported reasons for the stem sticking. Some suggestions on improving the dynamic characteristics during the valve open/close process have been given in the article.

关 键 词：能源与动力工程 阀杆热胀 运动间隙变化模型 再热主汽阀门 有限元分析 虚拟样机 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]