|제목(국문)||과도열응력해석을 이용한 배열회수보일러 고압드럼의 부식피로에 관한 안정성 평가|
|제목(영문)||Evaluation of Safety of Corrosion Fatigue of High Pressure Drum for Heat Recovery Steam Generator Using Transient Thermal Stress Analysis|
A method for evaluating the safety of the corrosion fatigue of a high-pressure (HP) drum for the heat recovery steam generator (HRSG) is presented through a transient thermal stress analysis. To evaluate the corrosion fatigue, European Standard EN 13445-3 is applied to check whether the magnetite protective layer on the water-contacting surface can be preserved during the transient operating conditions: cold start, hot start, warm start, and load change. Static analysis is performed to analyze the stress due to the operating pressure, and transient thermal and structural analyses are performed for the transient operating conditions. As per EN 13445-3, the analyzed maximum and mínímum stresses of the transíent operating conditions at representative locations are compared with the allowable limits derived from the stress due to the operating pressure. In conclusion, the magnetite protective layer was preserved under the transient operating conditions and the HP drum was found to be safe for the corrosion fatigue. The method of analyzing the thermal stress and evaluating the safety of the corrosion fatigue presented in this research can be applied effectively in the design stage of various unfired pressure vesse/s exposed to high temperature and high pressure loading.
|keyword||Corrosion fatigue (부식피로)， Heat recovery steam generator (배열회수보일러)， High-pressure drum (고압드럼)，
Magnetite protective layer (자철광 보호층)， Thermal stress (열응력)