超超临界机组再热蒸汽温度对中压内缸气密性影响的研究  

Influence Research on the Reheated Steam Temperature of Ultra Supercritical Unit on the Steam Tightness of IP Inner Casing

作　　者：陈铁宁[1] 黄建强[1] 尹华劼 尹刚[1] 刘全[1] 师春燕[1] 楚涛 CHEN Tiening;HUANG Jianqiang;YIN Huajie;YIN Gang;LIU Quan;SHI Chunyan;CHU Tao(Dongfang Turbine Co.,Ltd.,Deyang 618000,China)

机构地区：[1]东方汽轮机有限公司,四川德阳618000

出　　处：《机械工程师》2021年第12期105-107,110,共4页Mechanical Engineer

摘　　要：汽轮机汽缸的设计,除了要保证有足够的强度、刚性外,其中分面的气密性直接影响机组的安全、经济运行。以东汽某超超临界二次再热机组中压内缸为研究对象,通过引入陈化理论蠕变模型,对汽缸的温度场、应力场及螺栓蠕变松弛效应下的10万h的蠕变计算,分析了中压内缸高温螺栓蠕变后对汽缸中分面气密性的影响。结果表明:中压内缸螺栓蠕变发生松弛后,汽缸中分面局部接触压力略有降低,通过增设密封键等优化设计后中压内缸中分面气密性能够满足工程应用。In addition to ensuring sufficient strength and rigidity in the design of a steam turbine casing,the steam tightness of split directly affects the safe and economic operation of the unit.Taking the IP inner casing of an ultra-supercritical double-reheat unit of Dongfang Turbine Co.,Ltd.as the research object,by introducing the aging theory creep model,this paper calculates the temperature field,stress field,and creep of the cylinder after 100000 hours under the creep relaxation effect of the under bolt,and analyzes the impact of the creep of the IP inner casing high temperature bolt on the casing split steam tightness.The results show that after the creep of the IP inner casing bolts relax,the partial contact pressure of the casing split is slightly reduced,and the IP inner casing split steam tightness can meet the engineering application by adding a sealing key and other optimized design.

关 键 词：超超临界 二次再热 高温螺栓 蠕变松弛 气密性 

分 类 号：TK263.1[动力工程及工程热物理—动力机械及工程]