【摘要】 对某母管制背压式汽轮机机组的主汽-调节阀在定参数快速冷启动过程中的结构强度进行了研究,利用ABAQUS软件建立了主汽-调节阀三维有限元模型,得到主汽-调节阀在启动过程中的温度场和瞬态应力场,将主汽阀测点位置温度计算值与测量值进行了对比,并分析了不同主汽阀开度对主汽阀阀座应力交变行为的影响。结果表明:主汽阀测点位置温度计算值与测量值吻合较好;主汽阀阀座在启动过程中出现了明显的应力交变现象;通过改变主汽阀开度可以有效缓解主汽阀阀座的应力交变现象,降低主汽阀阀座疲劳损伤。更多还原

【Abstract】 A study was conducted on the structural strength of the main steam valve in a back-pressure turbine unit with manifold piping system during rapid cold startup at fixed parameters. A three-dimensional finite element model was established for the main steam valve using ABAQUS, so as to obtain its instantaneous temperature field and stress field in startup process, compare the calculated and measured temperatures at measuring points, and to analyze the effects of valve opening on the stress alteration. Results show that the calculated temperatures at measuring points of the main steam valve agree well with actual measurements. Obvious stress alteration exists in the main valve seat during startup of the main steam valve, which could be eliminated by changing the valve opening, thus to reduce the fatigue damage of the main valve seat.更多还原