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공정시스템,이동현상,화학공정안전 : LNG 밀도계를 이용한 저장 탱크 내 LNG 발열량 실시간 측정방법에 관한 연구
하영철 ( Young Cheol Ha ),이성민 ( Seong Min Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.1
가스호환성에 문제가 있는 저열량의 LNG가 도입되기 시작한 것은 2005년 동절기부터이다. 이러한 LNG의 도입량은 매년 증가하고 있으며 향후에는 극저열량(발열량 ≤ 9,500 kcal/Nm3)의 CBM(Coal Bed Methane), Shale LNG도 대량 도입될 예정에 있다. 따라서 호환 가능한 발열량의 가스를 인수기지에서 송출하기 위해서는 저장 탱크별 LNG 발열량을 실시간으로 모니터링할 수 있는 방법이 필요하게 되었다. 본 연구에서는 이러한 방법의 일환으로 저장 탱크 내설치된 밀도계를 이용하여 LNG 발열량을 실시간으로 측정할 수 있는 방법을 개발하고자 하였다. 이를 위해 액상 LNG 와 발열량 간의 정밀·정확한 상관식을 도출하고 이 방법의 불확도를 계산하였으며 또 인수기지 내 발열량 측정 시스템을 시험 구축하였다. 본 방법의 유효성을 확인하기 위해 현장 LNG 분석데이터와 비교하였으며 그 결과 0.17~0.47% 정도의 편차를 확인하였다. The low caloric LNG, which didn`t meet the gas interchangeability of Korea, has been imported from 2005 winter season. Amount of this LNG imports has been increased from year to year. In the near future, very low caloric LNG (calorific value ≤ 9,500 kcal/Nm3) such as CBM, Shale LNG will be imported large amounts. For this reason, we need a method for monitoring live calorific values(CV) of LNG in each storage tank to supply gasified LNG with interchangeable CV at LNG receiving terminal. This study was conducted to develope the method for measuring the live CVs of LNG in each storage tank using LNG densitometer. For this purpose, the accurate correlation between CV and density of LNG was derived and the uncertainty of this method was evaluated and also the measuring system for CVs was constructed at LNG receiving terminal. To verify this method, the results of measurement using this method were compared with the field data of LNG analysis and the results showed that the deviations were 0.17~0.47%.
건축물의 높이 및 변장비 변화에 따른 각주형 건축물의 평균풍압분포 특성에 관한 연구
하영철(Ha Young-Cheol),박재형(Park Jae-Hyeong),황성권(Hwang Sung-Kwon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
This study summarizes basic results on the characteristics of mean wind pressure distribution on rectangular buildings with various heights and side ratio which is needed to estimate reasonable wind load of buildings, through simultaneous multi-point wind pressure test. 12 types of rectangular wind pressure test models with various heights and side ratios have been made for this study. Wind pressure tests are conducted on the Boundary Layer Wind Tunnel at Kumoh National Institute of Technology. The characteristics of mean wind pressure distribution with respect to various heights and side ratios of buildings are analyzed as a function of the aspect ratios and side ratios. The result shows that wind pressure is decreased as the aspect ratio decreases and wind pressure distribution is significantly effected by side ratios on low-rise buildings.
발열량, 웨버지수, 불활성가스 농도로 표현한 가스호환성 판정 도표
하영철(Young-cheol Ha),이승준(Seung-jun Lee),이강진(Kang-Jin Lee) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
The existing natural gas interchangeability diagrams, which were expressed in Wobbe index and relative density, etc., do not provide nearly any other information other than the interchangeability. In order to overcome these disadvantages, in this study, the gas interchangeability diagram was expressed in calorific value, Wobbe index and inert gas concentration. The results show that this diagram provides a lot of other information in addition to the interchangeability.
고층건축물의 비틀림방향 변동풍력의 특성에 관한 실험적 연구
하영철(Ha Young-Cheol),김동우(Kim Dong-Woo),길용식(Kil Yong-Sik) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study aims at verifying characteristics of torsional fluctuating moment coefficient and power spectral density, which is needed to estimate torsional response of tall buildings. In order to estimate characteristics, the wind tunnel tests have been conducted on 52 types aero-elastic model of the rectangular prisms with various aspects ratios, side ratios and surface roughness in turbulent boundary layer flows. In this paper, characteristics of torsional fluctuating wind force are briefly discussed and then these results were mainly analyzed as a function of the aspects ratios and side ratios of buildings.