Life Evaluation And Structural Optimization Of A High-pressure Rotor Of An Stream Turbine

In recent years,power generation companies have continuously expanded the installed capacity of power grids,and high-parameter large-capacity steam turbine units have been widely invested.The steam turbines have become an inevitable trend.They have the characteristics of high intake steam parameters,low pollution,low heat consumption,and high thermal efficiency.Therefore,the evaluation of turbine rotor life has important theoretical and engineer ing values.The damage of the turbine rotor life is mainly due to the poor operating conditions,the uneven technical level of the operating personnel,and the direct relationship between product processing quality.From the perspective of the turbine rotor design,this paper calculates the lowcycle fatigue life and the creep deformation life of the turbine rotor under the conditions of cold start,warm start,hot start,and rated operating life limit.Assessment of life-time damage throughout the service period,while maximizing the potential of rotor material within the existing rated operating life,propose rotor structure optimization methods and optimization schemes,and maximize the use of the unit's rated operating life.Turbine unit efficiency improves unit economics.This paper takes the high-pressure rotor of a domestic steam turbine unit as the research object.and uses the large commercial finite element analysis software ABAQUS as the platform to establish the finite element model of the high pressu re rotor with the actual rotor model.Based on the heat transfer calculation between the steam and the rotor surface in the thermodynamic theory.The rotor temperature field is obtained.According to the actual operating conditions of the rotor,the real rotor operating environment is approximated and the steady s tate stress field of the rotor,the creep strain at 20 W hours,and the rotor transient process during a startstop of the rotor are obtained.Based on the Manson-Coffin theory and the creep strain life damage theory,the longevity assessment of high-pressure rotor dangerous sections was carried out.A computer-aided stress optimization method was also proposed.The optimized structure of the high-pressure rotor was proposed and the life of the rotor in the rated operating life range was calculated.The loss will greatly enhance the unit's operating life,providing safety guarantees for the follow-up unit to achieve rapid start and stop and variable load operation.