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Key Words:FiniteElementMethod(유한요소법),Large-ScaleAnalysis(대규모해석),ThermalFatigue(열피로),HeatRecoverySteamGenerator(배열회수증기발생기)초록:배열회수증기발생기는복합발전플랜트에서사용되는주요기기로서,박판으로제작된대형구조물이며열변형과열피로에매우민감하다.따라서운전중에발생하는열피로에의한파손을예방하기위하여대규모해석기반의안전성평가가필요하다.따라서본연구에서는대규모해석을수행하고이를활용하여배열회수증기발생기의손상메커니즘분석및해결방안을도출하고자한다.또한이를반영하여열변형과열피로를예방하고건전성을확보할수있는모델을제안및검증하고자한다.이는수직형배열회수증기발생기의안전성향상을위한기초자료로활용된다.Abstract: A Heat Recovery Steam Generator(HRSG) is the main component of a Combined Cycle PowerPlant(CCPP). It is a very large structure that is made from relatively thin metal sheets. Therefore, thestructuralintegrityofanHRSGisveryimportanttoensuresafeoperationduringplantlifetime.Inparticular,thermaldeformationandthermalfatiguehavebeenrevealedasthemaincausesofthemechanicaldegradationof an HRSG. In order to prevent unexpected damage, safety evaluation based on a large-scale analysis isnecessary.Therefore,thisstudyaimstoimprovethesafetyofHRSGbyusingFiniteElementAnalysis(FEA)resultsderivedfromlarge-scaleanalysis.Furthermore,themodifieddesignisverifiedbycomparingitwiththeoriginalone.Thisresultwillbeusedasbasicdataforimprovingthesafetyofavertical-typeHRSG. |
