基于ANSYS的减温器热固耦合应力仿真

Thermo-structural coupling stress simulation for desuperheater based on ANSYS

对某电站面式减温器筒体内壁承受低温冷凝水滴的部位进行理论应力计算,同时基于ANSYS对相同工况下的减温器进行间接的热固耦合应力仿真.结果验证低温冷凝水间断滴落是导致筒体内壁产生辐射状裂纹的最大根源,并从理论上通过线性插值推导得知低温冷凝水滴的温度低于207.5℃.仿真结果与理论计算结果偏差不超过10%,吻合较好,且后者更保守.结果可为结构设计更复杂的承压设备强度校核提供参考.

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 than 207.5℃. The error between the simulation results and the theoretical calculation results is lower than 10%, 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.