http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이희웅 ( H. W. Lee ),권숙인 ( S. I. Kwun ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.2
The influence of the cooling condition after solution treatment on the high temperature fatigue resistance of 23Cr-26Ni heat resistant steel was investigated. Two different cooling conditions were applied to the steel after solution treatment at 1200℃ for 3 hours. One specimen was water quenched immediately after the solution treatment. The other one was furnace cooled at a rate of 0.5℃/min down to 750℃ after the solution treatment. Then, both specimens were aged at 750℃ for 5 hours. Under two different heat treatment conditions, the low cycle fatigue (LCF) test was performed at 600℃ and room temperature (RT). Only cyclic hardening continued from the beginning until fracture at all strain amplitudes during LCF at 600℃. This phenomenon was attributed to the increase in the dislocation density due to cyclic deformation, which resulted in the interaction between the newly created dislocations and precipitates. Cyclic hardening followed by saturation and cyclic softening was observed at RT. Cyclic softening was attributed to the dislocation annihilation rate exceeding the dislocation generation rate. Other probable factor for cyclic softening was some cavities formed around grain boundaries after 20 cycles. WQ and FC have a similar LCF behavior at RT and 600℃ as shown in the cyclic stress response curves.
FPSO용 탑사이드 세퍼레이터의 내부 유동에 대한 수치적 연구
이희웅(H.W. Lee),서종무(J.M. Sur),임효남(H.N. Im) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
A floating production, storage and offloading (FPSO) is a floating vessel used by the offshore oil and gas industry for the processing of hydrocarbons and for storage of oil. The separators are FPSO topside facilities designed to separate a measure water, gas and oil rates. The separators are equipment with internal components such as inlet device, vane pack, coalescer, wave breaker, weir plates and mist extractor that facilitate and improve the separation of phases. The inlet device distributes well stream composed of water, gas and oil at the separator inlet to make calm and even flow for the improvement of separation efficiency. This research would show the flow patterns inside the 3-phase separator for the typical shapes of inlet device by using CFD analysis.
FPSO용 3상 세퍼레이터의 Mist Eliminator 성능평가에 대한 연구
서종무(J.M. Sur),이희웅(H.W. Lee),임효남(H.N. Im) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Wire mesh mist eliminator is widely used in various industrial fields, such as crude oil production plants and chemical process plants, specifically on gas scrubbers, packed towers and 3-phase separators, for the purpose to remove floating liquid droplets in the gas. The wide utilization of the wire mesh mist eliminator is due to the low-cost and high separation efficiency. However, despite of the wide applications of the wire mesh mist eliminator, design and performance validation cases using computational fluid dynamics are very limited. Heretofore, wire mesh mist eliminator design has been performed based on semi-empirical equations, and performance is validated through high-cost experiments. On this study, a method to evaluate the performance of a wire mesh mist eliminator which will be applied to the FPSO (Floating, Production, Storage, and Offloading) topside 3-phase separator by using two-dimensional computational fluid dynamics has been suggested to replace the high-cost experiments. To verify the suggested method, a comparison between the performance analysis using computational fluid dynamics, semi-empirical equation, and experiments has been performed with a specific wire mesh mist eliminator model.
FPSO 운동을 고려한 3상 세퍼레이터의 내부유동 해석
임효남(H.N. Im),이희웅(H.W. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
A floating production, storage and offloading(FPSO) unit is a facility for developing oil and gas found under the ocean for the processing of hydrocarbons and for storage of oil. The separators are FPSO topside facilities designed to separate a measure water, gas and oil rate. This paper will explore the possibilities of utilising CFD techniques on the three-phase separator design with FPSO motion. The influence of baffle and weir arrangement has been studied with CFD simulations including motion mitigation. The research would show the flow patterns inside the three phase separator for the typical shaped of baffle by using CFD analysis.