Numerical investigation of the Environmental Effects of Variables on a Reheat-stop-valve Assembly

BAO Jinsong, SHI Bing, JIN Ye


(Mechanical Engineering School of Shanghai Jiao Tong University, Shanghai, China, 200240 E-mail: tony_cim@sjtu.edu.cn or mebshi@gmail.com )

ABSTRACT A numerical investigation of steam-gas effects on the reheat-stop-valve assembly of 600MW steam turbine is presented. The analysis consists of two environmental variables: the effect of steam-gas heating and fluid dynamics on the valve performance. The numerical study uses computational fluid dynamics (CFD) and finite element analysis (FEA) software. Our goal is to investigate the influence of the temperature parameters of steam-gas and the valve torque characteristics derived from the fluid dynamics of steam-gas. These influences are analyzed for different operational states of the valve disk. The results show that the thermal expansion of the valve shaft is uneven along valve shaft, and it is determined that the fluid dynamic torque increases as the opening angle of valve disk increases in a nonlinear manner.

 

KEYWORDS: Reheat-stop-valve assembly; Steam turbine; Environmental variables; Numerical simulation; FEA; CFD


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