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Thermo-structural coupling stress simulation for desuperheater based on ANSYS

ZHENG Yuqing;ZHONG Fengping;KE Heji;ZHU Xichan;School of Automotive Studies,Tongji University;Zhejiang Special Equipment Inspection and Research Institute;College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics;  
The theoretical stress is calculated for the part of cylinder inwall of the surface-type desuperheater of a power plant which is subjected to low temperature condensation droplets,and the thermo-structural coupling stress is simulated indirectly for the desuperheater by ANSYS in the same working condition. The results verify that the radicalized cracks on the cylinder inwall are caused mainly by the intermittent dropping of low temperature condensed water,and the theoretical deduction using linear interpolation shows that the temperature of lower temperature condensation droplets is lower than207. 5 ℃. The error between the simulation results and the theoretical calculation results is lower than10%,which indicates that they are in good consistence; the latter is more conservative. The results can provide reference for the strength check of the pressure equipment that the structure design is more complicated.
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