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정재헌(Chong Chae Hon),김현기(Kim Hyun GEE),최영준(Choi Young Jun),이채수(Lee Chae Soo),하준욱(Ha Joon Wook) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The purpose of this study is to propose the guideline of damage calculation for HRSG(Heat Recovery Steam Generator) components in design step. Cyclic, high temperature and pressure operation of the HRSG creates loading that produce stresses in boiler components that ultimately may produce failures in components. Recently, high operating pressure and temperature are required because of efficiency and also frequent startup/shutdown ate demanded to meet the change of electric power load in HRSG. For this study, operation types that may produce fatigue failure were examined and damage instances that are reported from plant were briefly investigated. In addition, several country's Codes that are suitable for life analysis of HRSG were searched. Sample calculation was performed and approaching method of damage calculation was proposed.
배열회수보일러의 부하변동 운전에 따른 과열기 튜브들의 응력거동
정재헌(Chong Chae-Hon),송정일(Song Jung-Il) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.6
The purpose of this study is not only to evaluate the stress behavior of tubes in superheater in HRSG during the load change operation but also to find root causes of failure from stress behavior. Firstly, temperature during operation was collected to perform stress analysis from actual HRSG. Part load and full load stress analysis which can be represented as the whole load change operations were performed using conmlercial finite element software. The possibility that can lead to tubes failure is found by stress analysis and its results is compared with metallurgical mircrostructure of failed tube which was taken from actual HRSG.
이채수(Lee Chae Soo),최영준(Choi Young Jun),김현기(Kim Hyun Gee),양옥철(Yang Ok Chul),정재헌(Chong Chae Hon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The once-through heat recovery steam generator is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of boiler is structurally simpler than drum type boiler. In drum type boiler, each tube play a well-defined role: water preheating, vaporization, superheating. Empirical equations are available to predict the average heat transfer coefficient for each regime. For once-through heat recovery steam generator, this is no more the case and mathematical models have to be adapted to account for the disappearance of drum type economizer, boiler, superheater. General equations have to be used for each tube of boiler, and actual heat transfer condition in each tube has to be identified.
유한요소해석을 이용한 폐열회수보일러 과열저감기의 건전성 평가
하준욱(Joon Wook Ha),박성진(Seong Jin Park),정재헌(Chae Hon Chong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Finite element analysis was performed to evaluate the reliability of desuperheater in Heat Recovery Steam Generator of combined cycle power plant. For the analysis, symmetry condition was assumed to model the desuperheater assembly. Load combination of temperature difference and steam pressure was applied to model. Stress intensity was calculated and categorized through the wall thickness. Finally primary plus secondary stress intensity was compared with the design criteria of the ASME Boiler and Pressure Vessel Code Section Ⅷ, Division 2.