分体式调阀阀座强度分析与结构改进  

Intensity Analysis and Structural Improvement of Split Regulating Valve Seat

作　　者：张军辉 都晓鸣 张超 张科 于洋 ZHANG Jun-hui;DU Xiao-ming;ZHANG Chao;ZHANG Ke;YU Yang(Industrial Turbine Academy Turbo Mechanical Institute,Hangzhou Steam Turbine Power Group Co.,Ltd.,Hangzhou 310022,China)

机构地区：[1]杭州汽轮动力集团股份有限公司工业透平研究院,杭州310022

出　　处：《汽轮机技术》2023年第3期166-170,共5页Turbine Technology

基　　金：2021年杭州市高层次人才特殊支持计划项目;杭州汽轮动力集团股份有限公司资助项目(C研22-16)。

摘　　要：针对分体式调阀阀座结构,将有限元法、非线性接触计算理论以及多物理场热固耦合法相结合,模拟计算了稳态运行条件下的温度场与综合应力场,重点分析了强度和法兰结合面汽密性,为结构改进提供理论依据。研究结果表明:温差对结构强度影响较大,压差和管道力影响相对较小,初始设计结构强度满足使用要求,而法兰结合面设计及螺栓材料选用不合理导致结合面存在蒸汽泄漏的风险;通过采取对法兰结合面增加减荷槽、提升螺栓材料性能等方案进行改进,经计算验证在极限工况下即使考虑高温蠕变应力松弛,新结构依然能满足汽密性要求。Structural simulations were conducted for the split regulating valve seat using a simulation model combined with finite element method,nonlinear contact theory and multi-physics thermosetting coupling method.The steady state temperature field and comprehensive stress field were calculated.The structural strength and the steam tightness of the flange joint surface were mainly analyzed.According to the results,the temperature difference has a large impact on the structural strength,while the pressure difference and pipeline force have a relatively small impact.The initial design structural strength meets the design requirements,while the flange joint surface design and bolt material selection are unreasonable which resulting the risk of steam leakage on the joint surface,the new structure can still meet the requirements of steam tightness even if the high temperature creep stress relaxation was taken into account under the extreme condition through the improvement of the schemes such as adding load reduction groove on the flange joint surface and improving the material properties of bolts.

关 键 词：有限元法 调节汽阀 减荷槽 蠕变 汽密性 

分 类 号：TK263.1[动力工程及工程热物理—动力机械及工程]