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최미연(Miyeon Choi),문덕수(Deoksoo Moon),김현주(Hyeonju Kim) 한국해양환경·에너지학회 2021 한국해양환경공학회 학술대회논문집 Vol.2021 No.10
본 연구에서는 VMD(Vaccum Membrane Distillation)의 유입수의 온도와 농도를 달리하였을 때의 생산수의 성분 변화를 살펴보고, VMD 생산수를 수소 생산을 위한 수전해에 적용할 경우 용수로써 적합한지 여부를 분석하였다. 열에 의한 상변화와 분리막 기술을 결합한 해수 담수화 기술인 막증류 기술(Membrane Distillation, MD)은 소수성 분리막을 중심으로 온도차에 의한 증기압을 구동력으로 사용하는 공정이다. 이 때 투과측에 진공압을 걸어 주어 생산수를 얻는 형태가 VMD이다. VMD는 기존의 증발법에 비해 낮은 온도로 운전가능하며, RO 공정에 비해 운전에 필요한 에너지 소모량이 적고 100%에 가까운 염제거율을 가진다. 또한 유입수의 염분 농도에 생산수의 수질이 크게 변하지 않아 고농도의 염분을 가진 농축수를 처리하기에 적합하다. 물 전기분해에 의한 수소 제조기술에는 PEM형수전해, 고온수증기전해, 알칼라인수전해 등이 있으며, VMD 생산수를 이들 기술에 적용하여 수소 생산가능성을 알아보았다. In this study, changes in the composition of the produced water when the temperature and concentration of the influent of VMD(Vacuum membrane distillation) were changed were examined, and whether VMD produced water was suitable as water when applied to water electrolysis for hydrogen production was analyzed. Membrane distillation(MD) is a seawater desalination technology that involves phase change via heat and membrane technology. The driving force behind MD is the vapor pressure generated by the temperature differences between the two sides of a hydrophobic membrane. VMD is a derivative technology used to desalinate seawater by generating vacuum pressure on the permeate side. VMD can be carried out at lower temperatures compared to evaporation methods, and it consumes less energy than RO process. Also, it is suitable for the treatment of concentrated water with a high salt concentration, because the quality of the water obtained after distillation is not significantly affected by the salinity of the feed water. Hydrogen production technology by water electrolysis includes PEM-type water electrolysis, hot water steam electrolysis, and alkaline water electrolysis, and the possibility of hydrogen production was investigated by applying VMD production water to these technologies.
해수온도차발전 배출 심층수를 활용한 다단복합양식 에너지 수지분석
임승택(Seungtaek Lim),최미연(Miyeon Choi),문덕수(Deoksoo Moon) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
본 논문에 경우 해수온도차발전에서 열침으로 활용 후 배출되는 심층해수를 활용하여 다단의 복합양식 시스템을 구축하였으며, 부족한 열원은 해수열원 히트펌프를 적용하여 열에너지를 보완하였다. 연간 운전 특성을 비교하여 표층해수와 심층해수를 이용한 저온 생물 생장에 필용한 에너지 및 비용 변화를 분석하였다. 이때 저온 열원의 경우 수심 500m 이하의 5℃ 심층수와 해수온도차발전에 활용하고 배출되는 7℃의 심층수를 비교하였으며, 표층수의 경우 연간 동해안의 온도 변화를 적용하였다. 미역양식 수조에 공급되는 해수의 유량은 20톤/day이며, 미역양식 수조에서 배출되는 배출수는 약 3℃가량 온도가 상승하여 연어 양식 수조에 공급된다. 이후 연어양식 수조에서 배출되는 13℃의 배출수는 75%가량 해삼양식 수조에 공급되나 25%는 해상으로 배출된다. 해삼양식 수조에서 최종 배출되는 15℃의 배출수는 연어 양식에서 배출되는 배출수와 혼합되어 14.5℃로 해수히트펌프의 열원으로 활용된다. In this paper, a multi-stage complex aquaculture system was constructed using deep seawater discharged after using it as a heat sink in OTEC(Ocean Thermal Energy Conversion). By comparing the annual operating characteristics, changes in energy and cost required for low-temperature growth using surface seawater and deep seawater were analyzed. At this time, in the case of a low-temperature heat source, 5℃ deep water with a depth of 500m or less was compared with 7℃ deep water used for power generation and discharged. In the case of surface water, the annual temperature change of the east coast was applied. The flow rate of seawater supplied to the seaweed culture tank is 20 tons/day, and the temperature of the discharged water discharged from the seaweed culture tank rises by about 3℃ and is supplied to the salmon culture tank. After that, 75% of the 13℃ water discharged from the salmon farming tank is supplied to the sea cucumber culture tank, but 25% is discharged to the sea. The 15℃ discharge water finally discharged from the sea cucumber culture tank is mixed with the discharge water discharged from the salmon culture at 14.5℃ and is used as a heat source for the seawater heat pump.
정동호(Dongho Jung),김현주(Hyeoju Kim),문덕수(Deoksoo Moon),이승원(Seungwon Lee) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.1
In this study, the static and modal analyses to find the characteristic if eigenvalues for a towed cable were with a free boundary condition at the bottom end carried out with numerical study. The resulting numerical code with finite element method was used to study sample problems for a cable with towing speeds. After tracing the equlibrium state with a towing speed through the static analysis, modal analysis on the basis of static results was performed. The static top tension for a critical towing speed is nearly 50 percent of what it was for a free hanging pipe. From static analyses it is found that towing speed has a noticeable effect on top tension of a towed pipe. At a high towing speed, difference between the first and second periods become larger. Compared to the fundamental period for a free hanging pipe, that for a towed pipe with a critical towing speed is approximately 1.4 times larger. This result is very important point in that the lockin condition and tension of the towed cable system with top excitation can be predicted. The corrected close farm solution to solve natural periods for a towed cable was presented in this study. The code is validated by comparison of the results of theoretical and numerical studies. Two results were in very good agrrement. This study can contribute to predicting the lockin condition and tension for a towed cable or pipe with top excitation.