http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
선칠령(Seon Chil-Yeong),황석환(Hwang Sek-Hwan),김현기(Kim Hyun-Gee),조진현(Cho Jin-Hyun) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents a static and dynamic simulation models of Heat Recovery Steam Generator (HRSG) with once-through evaporators and its application to investigate the load changes and startup processes for the combined cycles. The outstanding advantages of once-through HRSG (OT HRSG) are the rapid start-up/shutdown and operational flexibility. But it’ control system is more complex than drum type HRSG. Therefore, to design such a system, it is necessary to have computer models in detail. The OT HRSG models were made using commercial simulation software, APROS. The results of simulation for steady state, load changes, startup and shutdown operating processes were compared with the design data and gas turbine operating curves.
김현기(Kim Hyun-Gee),선칠령(Seon Chil-Yeong),이채수(Lee Chae-Soo),Falah Alobaid 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper presents a static and dynamic simulation model of a Super Critical Heat Recovery Steam Generator (SC HRSG) and its application to investigate the load changes and start-up processes for the next generation high efficiency combined cycles. To design the modem combined cycle power plants with high pressure and temperature steam requirements, it is necessary to generate detailed computer models. As an important supports for designers this study describes the upgrading of a validated subcritical HRSG model to SC HRSG. The model includes advanced control circuits to achieve a high level of accuracy, especially during startup. The comparison between the simulation results and the designed data in steady state and different load changes are documented. The obtained results demonstrate that the simulation is very reliable to predict the startup procedure for the SC HRSG. And differences in the thermal efficiency between Sub & SC HRSGs during warm start-up process are assessed.
확산접합기술을 이용한 H2 Station용 PCHE형 Compact 열교환기 개발
김정길(Jeong Kil Kim),심덕남(Deog Nam Shim),선칠령(Chil Yeong Seon),양기훈(Ki Hoon Yang),박해지(Hae Ji Park),김동진(Dong Jin Kim) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.5
Diffusion bonding was performed on STS316L plate with micro channels to understand the relationship between bonding conditions and mechanical properties of the joints. Various defects such as spot and line defects developed along the joints bonded at various bonding conditions. As the bonding temperature increased, these defects had a tendency to decrease. With experimental results, it was revealed that bonding temperature was the most critical for formation of defects along the joints. Additionally, the sound joint showed coalescence of grains along the joint by migration of the grain boundaries. Tensile test result showed that the sound joint had better mechanical properties than STS316L base metal, and that crack initiated at spot and line defects followed by fracture. Based on experimental results, PCHE was manufactured and it passed hydraulic test under 1200 bar.
EN Code 를 적용한 배열회수보일러의 드럼 피로수명평가
황석환(Hwang Sek-hwan),김현기(Kim Hyun-gee),선칠령(Seon Chil-yeong),이채수(Lee Chae-soo),이부윤(Lee Boo-youn) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The purpose of this study is to confirm the structural reliability of the main component in HRSG by evaluating the structural integrity of HP drum according to EN code. The HP drum is the most thick-walled pressure vessel in HRSG, in which significant thermal stresses occur during the load change and transient operation. In this paper, transient temperatures and pressures determined by the dynamic simulation were taken into consideration, and thermal and structural finite element analyses(FEA) were performed to properly evaluate their effects. Using the results of the FEA, fatigue life of the HP drum was evaluated.
Finned Tube Bundle에 대한 Ash Fouling전산해석
최낙정(Choi Nak-Jeong),김현기(Kim Hyun-Gee),선칠령(Seon Chil-Yeong),김주석(Kim Joo-Suk),전충환(Jeon Chung-Hwan) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The objective of this paper is to examine ash fouling behavior in a finned tube bundle by CFD simulation. A Finned Tube Bundle as heat exchanger is exposed to medium temperature(<520℃) region. Under the condition, we consider the particulate fouling only and neglect the condensation and chemical reaction. We derived a fouling model which is composed of the deposition and removal process. Capture conditions of ash particles in the deposition model is decided by force balance of van der waals, elastic rebound and gravity force. The removal model is derived from theoretical approach. A combination of both models was coded by UDF(User Defined Function) in FLUENT and can predict asymptotic behavior of the fouling process. Computational domain is a 9-rows finned tube bundle and flow is vertical opposed to the direction of gravity. We conducted a case study such as effects of ash concentration, inlet velocity and ash particle size distribution on fouling behavior.