Size optimization of diverter damper shell of bypasssystem of heat recovery steam generator
                                                             ZHANG Shifeng, XU Xiaopeng, TAO Zhisen
                                          (Hangzhou Boiler Group General Equipment Co., Ltd., Hangzhou 311108, China)

Abstract: Aiming at the light weight and vibration problem of diverter damper of bypass system of heat recovery steam generator (HRSG), the study on plate with stiffener of tee diverter damper were carried out. Combined with the relevant standards and practical experience, the design and analysis load of diverter damper were summarized. Multiple load condition and analysis type of the mathematical optimization model which taken the stiffener Hbeam section size as variable was established. The size optimization analysis of the shell stiffener of bypass damper was carried out with the help of OptiStruct software, which mainly involves static strength analysis, modal analysis and buckling analysis. The optimized Hbeam section size was finally obtained after recalculation and verification. The results indicate that the strength, stiffness and buckling of the structure after optimization meet the standard requirements, and the 2order vibration frequency is reduced from 6 Hz to 5.19 Hz, meeting the requirement of avoiding resonance of gas turbine. Reinforcing stiffener is about 30 T lighter than the design before.

Key words: heat recovery steam generator (HRSG); diverter damper; bypass system; size optimization; plate with stiffener