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Numerical simulation and improvement analysis of steam seal line
Published:2018-07-31 author:WU Hong xia1, LIU Qing long2, GU Lei1 Browse: 1856 Check PDF documents
                                                  Numerical simulation and improvement analysis of steam seal line
                                                               WU Hong xia1, LIU Qing long2, GU Lei1
(1.Hangzhou Xiaoshan Technician College, Hangzhou 311201, China;2.Hangzhou Chinen Steam Turbine Power Co., Ltd ., Hangzhou 310018, China)


Abstract: Aiming at the problem of steam sealing property, the suction pressure propagation of steam seal line s effect on steam seal leakage, the complex flow path structure s effect on the suction pressure delivered to steam seal side and on steam seal leakage, the difference between theoretical calculation and CFX simulation results of steam seal flow and so on were studied. Three dimensional solid modeling and numerical simulation of steam seal were done, the performance parameter calculation results of steam seal line, the cross section pressure distribution and the cross section velocity distribution of steam seal line were analyzed, and an improved structure of steam seal line was proposed, which is a simple, effective and economic structure used in site reconstruction. The results indicate that by the augmentation of middle segment balance pipe diameter, the improved structure can effectively decrease the pressure loss of steam seal line, increase the pressure of transition segment, decrease the leakage of high pressure segment, increase the effect of steam seal, increase the operation efficiency and reliability of steam turbine.
Key words: steam turbine; steam seal effect; steam seal line; CFX simulation

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