Thermal stress analysis for rotor of 600MW supercritical steam turbine

Zhang, Chunlin; Hu, Niansu; Wang, Jianmei; Chen, Qiping; He, Feng; Wang, Xiaoli

doi:10.1109/cecnet.2011.5768580

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The results were compared to the theoretical SCF charts developed by Peterson. [3] this article addresses the thermal shock assessment of a 600 MW turbine rotor in a hot startup cycle using ANSYS. The steam turbine rotor was thermomechanically finite and elementally analyzed using actual operational data.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Change in Startup Cycle Time on Transient Thermal Stresses in Steam Turbine Rotor

Nagpure

Nath²

2022

SMSJ

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During the turbine start stop period, occuring at brief intervals , the temperature of the steam turbine rotor varies. Because of the significant temperature gradients, this shift in temperature causes transitory thermal stresses in the rotor. Changes in material parameters such as thermal expansion coefficient ,modulus of elasticity, thermal conductivity, specific heat, Poisson's ratio, and others cause transient stresses. Thermal and mechanical stresses are applied to the turbine rotor. Before designing the rotor, it is necessary to estimate transient thermal stresses. The finite element study of a 210 MW steam turbine rotor for transient thermal loading is investigated in this paper. 30Cr1Mo1V was used to make the rotor. CAD software (PRO-E) was used to create the high-pressure turbine model. Since the steam turbine shaft (rotor) was symmetric about the axis along which it rotates, the model was solved using a 1 Degree slice model. Ansys 11 was used to investigate the FE model for transient thermal stresses for reduced cold start up cycle. The analysis was carried out for start up cycles of 560, 440 and 320 minutes respectively. The comparative results were studied and it was observed thatalthough the transient thermal stresses in the reduced cold start up cycle of 440 minutes are higher as compared to the transient thermo-mechanical stress value for actual cold start up cycle (560 minutes) but are within safe limits of yield and tensile strength. The thermal stress values for the other reduced cold start up cycle (320 minutes) re quite higher than the allowable yield and tensile strength of the material and hence cannot be considered as feasible start up cycle. Thermal stresses in the transient state were found to be significantly higher than steady state thermal stresses.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of Change in Startup Cycle Time on Transient Thermal Stresses in Steam Turbine Rotor

Nagpure

Nath²

2022

SMSJ

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“…Manson-Coffin equation was used to predict the failure location of a rod-fastened rotor based on a two-dimensional finite element model at transient condition [14]. Because the great temperature gradient and thermal stress will diminish the fatigue life of the gas turbine rotor, high-performance materials were introduced to ensure the operating security [15][16][17][18][19]. Apart from the material selection, the optimization method was necessary for minimizing the stress and the fatigue consumption of the turbine rotor.…”

Section: Introductionmentioning

confidence: 99%

Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal‐Mechanical Method

Liu

Yuan

Zhu

et al. 2018

Shock and Vibration

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The rotor is the core component of a gas turbine, and more than 80% of the failures in gas turbines occur in the rotor system, especially during the start-up period. Therefore, the safety assessment of the rotor during the start-up period is essential for the design of the gas turbine. In this paper, the transient equivalent stress of a gas turbine rotor under the cold start-up condition is investigated and the novel tie rod structure is introduced to reduce the equivalent stress. Firstly, a three-dimensional finite element model of the gas turbine rotor is built, and nonlinear contact behaviors such as friction are taken into account. Secondly, the convective heat transfer coefficients of the gas turbine rotor under the cold start-up condition are calculated using thermal dynamic theory. The transient analysis of the gas turbine rotor is conducted considering the thermal load, the centrifugal load, and the pretightening force. The temperature and stress distributions of the rotor under the cold start-up condition are shown in detail. In particular, the generation mechanism of maximum equivalent stress for tie rods and the change tendency of the pretightening force are illustrated in detail. The tie rod holes of the rear shaft and the turbine tie rod are the dangerous locations during the startup period. Finally, a novel tie rod is proposed to reduce the maximum equivalent stress at the dangerous location. The maximum equivalent stress at this location is decreased by 15%. This paper provides some reference for the design of the gas turbine rotor.

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Shape and operation optimisation of a supercritical steam turbine rotor

Nowak

Rusin

2013

Energy Conversion and Management

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Thermal stress analysis for rotor of 600MW supercritical steam turbine

Cited by 4 publications

References 2 publications

Effect of Change in Startup Cycle Time on Transient Thermal Stresses in Steam Turbine Rotor

Effect of Change in Startup Cycle Time on Transient Thermal Stresses in Steam Turbine Rotor

Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal‐Mechanical Method

Shape and operation optimisation of a supercritical steam turbine rotor

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