• 한국가스학회지
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• 제1권1호
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• pp.101-105
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• 1997

LPG 지하저장기지에서 클로깅 현상이 발생할 경우 저장공동 주위의 지하수위가 설계된 수치보다 낮아져 저장물이 누출되므로 이에 대한 감지가 필수적이라 할 수 있다. 따라서 본 연구에서는 클로깅 현상이 실제로 발생하였을 경우 저장기지에서 관측할 수 있는 관측인자인 공동주변 지하수위, 수벽공 주입수량, 공동 삼출수량들의 변화양상을 고찰하기 위하여 지하저장기지를 모사한 모형실험장비를 제작하여 각 인자들의 변화 측정실험을 수행하였다. 클로깅 발생시 관측인자의 변화양상은 다음과 같다. 지하수위는 공동의 압력이 커짐에 따라 증가하고 클로깅이 심할수록 감소하는데, 클로깅 발생을 지하수위 변화에 의해서 보다 잘 감지하려면 공동의 압력을 가능한 낮게 하고, 공동 운영 초기의 지하수위와 현재 운영 상태의 지하수위를 비교해 보는 것이 바람직하다. 클로깅에 의한 지하수위의 감소는 수벽공의 압력이 커질수록 다소 둔화된다 현탁물질에 의한 클로깅이 심할수록 주입수량과 삼출수량은 선형적으로 감소하는데 주입수량의 감소율이 삼출수량의 감소율보다 크게 나타난다.

• 한국가스학회:학술대회논문집
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• 한국가스학회 1997년도 추계학술발표회 논문집
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• pp.253-259
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• 1997

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.201.2-201.2
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• 2011

A water-source heat pump system has been developed for cooling and heating of a green house on the waterfront in Jinju. In order to supply a heat source/sink of water in alluvium aquifer to the heat pump system, the riverbank filtration facility (two pumping wells and one recharge well) for water intake and injection has been constructed. To pump and recharge water sufficiently, the geometric design such as depth and diameter for the wells have been completed, and details of the well such as slot size and length of the screen and filter pack size have been designed based on the practical and theoretical design method including D30 technique. For the investigation of the hydrogeological characteristics, step-drawdown test, long-term pumping test, and recovery test have been carried out for two developed pumping wells. Step-drawdown test has been performed on 4 step flowrates of 150, 300, 450, $600m^3$/day for 1 hour, and long-term pumping test on flowrate of $500m^3$/day for 24 hours, and recovery test for 6 hours. Since the underground water filtrated by riverbank is flowing smoothly into the well, the water level goes down slightly for the long-term test. Consequently, the stable pumping flowrate for two pumping well has been predicted at least over $1,647m^3$/day which is larger than the flowrate of $1,000m^3$/day for a 60 RT heat pump system.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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• pp.635-640
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• 2004

The present paper provides the design specifications and working principle of flow controlling vortex valve which will be adopted in a Korean next generation reactor (APR1400). The vortex valve is installed inside the pressurized safety injection tank of APR1400, and it passively controls the water discharge flowrate from the tank. In the present study, the performance of the vortex valve have been evaluated throughout the repeated experiments in the full-scale test facility called VAPER(VAlve Performance Evaluation Rig). Based on the experimental results, it is confirmed that the currently developed vortex valve satisfies the major performance requirements of APR1400 plant design in view of the peak discharge flowrate, pressure loss coefficient, and total discharge duration time. To achieve the highest quality of the experimental results, a quality assurance program for vortex valve tests has been strictly applied.

• 대한화학회지
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• 제43권4호
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• pp.430-437
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• 1999

흐름주입 분석법(FIA)에 의한 간접 요오드화 UV 검출법으로 총 잔류염소를 신속하게 정량하는 방법을 연구하였다. FIA장치를 최적화하기 위해 용리액의 pH, 요오드화 이온의 농도, 혼합 및 반응코일의 길이,시료주입량 및 유속, 온도 및 검출파장에 대한 변화를 관찰하였다. pH 8.3에서 하이포아염소산 이온은 요오드화 이온을 선택적으로 산화시키고 자신은 염화이온으로 환원되었다. 방해이온을 제거하기 위한 가리움제로서 에틸렌다이아민이 가장 좋은 효율을 나타내었다. 하이포아염소산 이온의 검정곡선은 0.03-0.3 mg/L의 농도 범위에서 0.999이상의 직선성을 나타내었고, 검출한계는 0.007 mg/L이었다. 이러한 분석조건하에서 몇몇 전주근교 상수중 총 잔류염소의 농도를 정량하였다.

• 상하수도학회지
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• 제24권4호
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• pp.443-451
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• 2010

This study was conducted to confirm the CSOs characteristics, and to estimate treatment efficiency of CSO treatment process. Flowrate was average $53,500m^3$/d, maximum $58,100m^3$/d during dry season, but after rain-fall, the flowrate was increased more than twice that of the dry season. And, water pollution concentrations, such as $COD_{Cr}$, SS, $BOD_5$, TN and TP of after rain-fall, were also increased. Thus, for more efficient treatment of pollutants during rainy season, The vortex separator and continuous fiber filter devices were used. From the results on particle range, removal efficiency of particle was 99.7% at the particle size range of $40{\sim}100{\mu}m$ but decreased as 55-80% at the below $40{\mu}m$. The removal efficiencies of $COD_{Cr}$, SS, TN and TP were approx. 70, 60, 70 and 50, respectively during the dry season and approx. 50, 50, 8 and 18% during the rainy season. Also, when compared with the primary sediment basin, $COD_{Cr}$, SS, TN and TP removal efficiencies were high. especially, at the case of TN and TP, TN was more removed than TP because of higher conversion factor value. But we needed more study for the injection of a coagulants to get more stable treatment efficiency for soluble pollutants. Consequently, This process can be used for CSOs treatment as well as replace the primary sedimentation basin during the dry season.

• 대한기계학회논문집B
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• 제24권3호
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• pp.338-345
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• 2000

A model testing has been performed to investigate the flow characteristics of a vortex chamber, which plays a role of a flow switch and passively controls the discharge flow rate. This method of passive flow control is a matter of concern in the design of advanced nuclear reactor systems as an alternative to the active flow control to provide emergency water to the reactor core in case of postulated accidents like LOCA (Loss-Of-Coolant Accident). By changing the inflow direction in the vortex chamber and varying the flow resistance inside the chamber, the vortex chamber can control passively the injection flowrate. Fundamental characteristics such as discharge flow rate and pressure drop of the vortex chamber are measured, and its parametric effects on the performance of the vortex chamber are also systematically investigated.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.630-633
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• 2005

Some gases can be formed into hydrate by physical combination with water under appropriate temperature and pressure condition. Besides them, it was found that the pore size of the sediments can affect the formation and dissociation of hydrate. In this study, formation temperatures of carbon dioxide and methane hydrate have been measured using isobaric method to investigate the effects of flow rates of gases on formation condition of hydrate in porous rock samples. The flow rates of gases were controlled using a mass flow controller. To minimize Memory effect, system temperature increased for the dissociation of gas hydrates and re-established the initial saturation. The results show that the formation temperature of hydrate decreases with increasing the injection flow rate of gas. This indicates that the velocity of gas in porous media may act as kinds of inhibitor for the formation of hydrate.

• 대한화학회지
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• 제44권6호
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• pp.556-562
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• 2000

간접 요오드화법의 UV 검출을 이용한 흐름주입분석에 의한 아염소산 이온의 정량에 관하여 연구하였다. 산성 조건하에서 아염소산은 요오드화 이온을 요오드로 산화시키고 자신은 염화 이온으로 환원된다. UV 370nm에서 노란 색으로 발색된 요오드의 흡광도를 측정하여 아염소산 이온을 간접적으로 정량 하였다. 흐름주입분석-UV검출 장치를 이용한 무기성 소독부산물인 아염소산 이온을 선택적으로 정량하기 위한 분석 인자로서 혼합 및 반응코일 길이, 산성 용리액의 pH, 요오드화 이온의 농도, 주입고리부피, 반응 온도, 유속을 최적화 하였다. 조제수로부터 산화제나 방해 물질들을 제거하기 위한 가리움제를 조사하였다. 아염소산 이온에 대한 0.002~0.2 mg/L의 선형 농도 범위에서 검정곡선은 0.999이상의 상관계수를 나타내였다. 아염소산 이온의 검출한계는 0.18 ${\mu}g/L$이었다.