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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.
하준욱(Joon Wook Ha),김태완(Tae Woan Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Casting defects are evaluated by stress category drawings obtained from finite element analysis for the fossil power plant valve casings such as the main stop valve casing and the control valve casing. The numerical stress intensity regulated by ASME Code is compared with those of the experiment and the two results show a good agreement. The numerical stress intensity is classified into four stress categories according to the allowable stress and rupture strength of valve casing materials. Finally, stress category drawings are prepared based upon the four stress categories.
문준호 ( Joon Ho Moon ),서영일 ( Young Il Seo ),김현아 ( Hyun Ah Kim ),홍지현 ( Ji Hyun Hong ),전강 ( Gang Jeon ),하준욱 ( Jun Wook Ha ),이승순 ( Seung Soon Lee ),정재원 ( Jae One Jung ),박충기 ( Choong Kee Park ),박혜림 ( He Lim 대한류마티스학회 2004 대한류마티스학회지 Vol.11 No.4
Scleroderma is rare disease of unknown etiology characterized by fibrosis of skin and internal organs such as lung, gastrointestinal tract, kidney, heart and so on. The association between scleroderma and malignancy has been a controversy during recent years. We report a 77-year old female who had scleroderma and squamous cell carcinoma of esophagus. She was diagnosed as esophageal carcinoma and then sclerotic skin change developed in both hands and feet 3 months later. We present this case with a review of literatures.
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.