汽轮机旁路供热系统的减温减压器安全性分析  

Safety Analysis of Desuperheater Pressure Reducing Station in Bypass System of Steam Turbine

作　　者：赵金峰[1] 冯忠宝 曹丽华[2] 司和勇 姚莹莹[1] ZHAO Jin-feng;FENG ZHong-bao;CAO Li-hua;SI He-yong;YAO Ying-ying(Jilin Province Electric Power Research Institute Company Limited,Changchun 130021, China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012, China)

机构地区：[1]吉林省电力科学研究院有限公司,长春130021 [2]东北电力大学能源与动力工程学院,吉林132012

出　　处：《汽轮机技术》2019年第1期71-73,77,共4页Turbine Technology

基　　金：国家电网公司科技项目资助(JLDKYGSWWFW201805021)

摘　　要：针对汽轮机高旁供热下减温减压器安全性问题,建立减温减压器CFX-Static structural流固耦合模型,采用凝结-蒸发多相介质模型实现喷水减温,从流场和结构力学两方面对减温减压器的安全性进行研究。结果表明:减温减压器通过节流扩压可实现大压降降压过程。由于蒸汽的旋涡运动,减温减压器内会出现高低温区的不均匀分布,进而影响阀体的形变量;减温减压器入口、支撑环、一级节流孔板以及下半部底座形变量较大。阀体凹槽、支撑环内侧以及一级节流孔板中部应力集中较强。Aimed at the safety of desuperheater pressure reducing station in high pressure bypass system of steam turbine, the CFX-Static structural fluid-solid coupling model of desuperheater pressure reducing station was established. The spray desuperheating by condensation-evaporation multi-phase model is also realized. The results from aspects of flow field and structural mechanics show that the large pressure drop can be achieved by throttling and diffuser. The uneven distribution of high and low temperature zones appear in desuperheater pressure reducing station because of the steam vortexes, which affect the deformation of valve body. The deformation of inlet, support ring, the first throttle orifice plate and the lower half of desuperheater pressure reducing station is greater. The groove of valve body, the inner side of supporting ring and the first throttle orifice plate have stronger stress concentration.

关 键 词：减温减压器 流固耦合 安全性 结构力学 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]