基于轴向力矩分配系数的汽轮机管道接口允许载荷设计方法  

Design Method of Allowable Pipe Load for Steam Turbine Based on Axial Moment Distribution Factor

作　　者：汪勇[1] 史进渊[1] 杨宇[1] 邓志成[1] 李汪繁[1] 

机构地区：[1]上海发电设备成套设计研究院,上海市闵行区200240

出　　处：《中国电机工程学报》2016年第23期6448-6453,6610,共6页Proceedings of the CSEE

基　　金：国家科技重大专项(2013ZX06005007);国家核电技术公司员工自主创新项目(CNP-KJ-CX-2014-14)~~

摘　　要：总结了目前行业使用的汽轮机管道接口允许力与力矩的设计方法,提出基于轴向力矩分配系数的设计方法,推导了轴向力矩分配系数的解析表达式,并给出基于有限元的轴向力矩分配系数确定方法。以某型600MW汽轮机高中压外缸为实例,计算了合缸、半空缸等状态下的轴向力矩分配系数,进而采用轴向力矩分配系数方法对汽缸稳定性进行了分析,并与传统简化模型算法和有限元方法的计算结果进行了对比。结果表明:以有限元计算结果为参考,文中方法计算的猫爪处支反力最大偏差为1.2%,而传统方法的最大偏差为37.0%,说明文中方法有效地提高了简化算法的计算精度。文中计算方法一次确定轴向力矩分配系数,可满足同类型机组管道接口不同载荷工况的稳定性计算需求,为汽轮机管道接口允许力和允许力矩设计提供了新思路。The design method of allowable pipe load for steam turbine based on axial moment distribution was proposed, with a summary of the allowable pipe load design method at present. The equations of axial moment distribution factor（AMDF） was derived. The procedure of obtaining AMDF for steam turbine casing using finite element method（FEM） was presented. Taking a 600 MW steam turbine as an example, the AMDF value was calculated using finite element method in full cylinder status and half cylinder status. The reaction forces of casing paws were calculated using AMDF method and traditional simplified method. It shows that, took FEM result as reference, the maximum deviation of AMDF method was 1.2%, while the maximum deviation of traditional method was 37.0%, which proved an accuracy improvement of the AMDF method. The AMDF calculated by FEM for a given kind of steam turbine can be used in stability analysis under different load cases of pipeline connections, which provided a new way of allowable pipe load design for steam turbines.

关 键 词：汽轮机 应力分析 稳定性分析 管系设计 有限元方法 轴向力矩分配系数 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]