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수압교환식 에너지회수장치를 구비한 역삼투식 담수화시스템의 성능해석
박상진(Sang-Jin Park),함영복(Young Bog Ham),김유창(Yu Chang Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Desalination is one of highly energy-intensive processes. Nowadays, it is a common practice to produce fresh water from seawater using membrane separation process as a desalination method. In this case, the driving force is pressure difference across the membrane and the seawater is usually fed to membrane module under condition of more than 5 ㎫ by high pressure pumps. Energy cost owing to high pressure pumping is up to a half of total OPEX (operating expense). To reduce energy cost, energy recovery devices (ERO) have been installed to reverse osmosis systems and its function is very similar to a turbocharger of automotive engine. In this work, performance analysis was done on a reverse osmosis desalination system with hydro-static pressure exchanger (HPX) as an ERO. HPX is a new concept ERO developed by KIMM. The result shows more than 40% of the whole energy can be saved by employing of the HPX.
구형용기의 상부면 냉각에 의한 해수 동결거동의 실험적 연구
최부홍 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.4
Currently as due to the rapid development of industry and increase in population we meet serious problems concerning the shortage and pollution of water. In the country many experts predict a shortage of water approaching 450 million tons by the year 2006. To cope with this serious problem it is necessary to construct desalination plants. In the adoption of a desalination system the most important factor is the cost of fresh water production,. In general LNG is stored in a tank as a liquid state below $-162^{\circ}C$. When it is serviced, however the LNG absorbs energy from a heat source and transforms to a high pressure gaseous state. During this process a huge amount of cold energy accumulated in cooling LNG is wasted. This wasted cold energy can be utilized to produce fresh water by using a sea water freezing desalination system. In order to develop a sea water freezing desalination system and to establish its design technique qualitative and quantitative data regarding the freezing behavior of sea water is required in advance, The goals of this study are to reveal the freezing behavior of sea water is required in advance. The goals of this study are to reveal the freezing mechanisms of sea water to measure the freezing rate and to investigate the freezing heat-transfer characteristics,. The experimental results will provide a general understanding of sea water freezing behavior in a rectangular vessel cooled from above.
김명준 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.5
In the adoption of a desalination system the most important factor is the cost of fresh water pro-duction. In general LNG is stored in a tank as a liquid state below $-162^{\circ}C$ When it is serviced however the LNG absorbs energy from a heat source and it is transformed to a high pressure gaseous state. During this process a huge amount of cold energy accumulated in cooling LNG is wasted. This wasted cold energycan be utilized to produce fresh water by using a sea water freez-ing desalination system. in order to develop a sea water freezing desalination system and to estab-lish its design technique qualitative and quantitative data regarding the freezing behavior of sea water is required in advance. The goals of this study are to reveal the freezing mechanisms of sea water in a cooled circular tube to measure the freezing rate and to investigate the freezing heat-transfer characteristics. The experimental results provide a general understanding of sea water freezing behavior in a cooled circular tube.
역삼투압식 해수담수화플랜트용 용적형 에너지회수장치 개발
권순광(S. K. Kwon),강만곤(M. G. Kang),최현철(H. C. Choi),전상규(S. G. Jeon) 유공압건설기계학회 2011 유공압건설기계학회 학술대회논문집 Vol.2011 No.6
ERDs(Energy Recovery Devices) helps to lower specific water cost by saving power consumption of the high pressure pumps in SWRO(Seawater Reverse Osmosis) desalination plants thus making the process more efficient and cheaper. This paper introduces a design of directional control valve for the ERD, which can realize high efficiency with the sliding poppet valve type by emans of the ultimate leakage protection in a pressure exchanger. The poppet valves are inherently the best method for leakage protection. And the ERD control valve is designed so that four poppets are controlled simultaneously by a single shaft. It is also designed to ensure the minimization of leakage as well as pressure loss. The pilot scale test(7.2m³/h) successfully showed high efficiency of 97% with this mechanism.
응축방식을 이용한 담수화 시스템의 성능예측을 위한 분석연구
김철호,김원일,최재영,김재철,김민선,Kim, Chul-Ho,Kim, Won-Il,Choi, Jea-Young,Kim, Jae-Choul,Kim, Min-Sun 대한기계학회 2014 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.2 No.1
본 연구에서는 태양열에 의해 증발된 해수면에서의 수증기를 응축의 원리를 이용하여 담수의 생산이 가능한 친환경 담수장치(Eco-friendly Desalination System)를 고안하고, 가능성을 판단하는데 연구의 목적을 두고 있다. 응축 열전달 공식을 이용하여 습공기의 물성변화에 따른 연간 응축수 생산량을 예측하였으며, 항온항습챔버의 실험을 통해 실제 습공기조건 변화에 따른 응축량을 측정하였다. 습공기의 이론 응축률과 실험을 통해 측정한 실제 응축률의 오차율을 산출하였으며, 오차의 원인을 분석하고 응축률 보정계수인 응축계수와 점성계수를 구하여 보정된 이론 응축률 공식에 도출하였다. 보정된 응축률 식을 이용하여 설계된 규모의 풍력터빈연간 생산 가능한 담수량을 산출한 결과 최대 연간 약 2,927톤 정도의 담수를 생산할 수 있다는 사실을 알 수 있었다. A new concept of an Eco-friendly desalination method is introduced in this study. The main idea of the desalination method of seawater is the condensation of the vaporized seawater by solar heat energy on the surface of seashore. The wind turbine blade plays a role of heat exchanger condensing the vaporized water in the air. In this analytical study, the availability of the proposed desalination system was studied. First, an analytical condensation theory of the vaporized water in air was arranged and the parametric study was conducted to estimate the amount of freshwater produced from the system with the change of the temperature difference between the humid air and turbine blade, and the relative humidity in air, and wind speed. From the analytical calculation, 2,927(ton/year) of freshwater was produced at the vertical-type wind turbine (Diameter=4m, Height=3m) as the relative humidity is 100%, the temperature difference between the impeller blade and the humid air is $40^{\circ}C$ and the wind speed is 10m/s.
권순광(S. K. Kwon),강만곤(M. G. Kang),최준혁(H. C. Choi),이중연(J. Y. Lee),전상규(S. G. Jeon) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
Seawater reverse osmosis(SWRO) desalination plants are being expanded to apply due to the advantages of lower energy consumption. The desalination plants tend to be larger considering the cost of capital, operation and maintenance, the research and development for high efficiency components is being accelerated. Hyosung Goodspings Inc. is developing a high efficiency energy recovery system for saving electric power consumption in the plants. Direction control valves of the energy recovery system have novel structure which combine poppets and spools to minimize leakage. The valves is able to reduce external power required to change the direction using pressure balancing parts. To apply the energy recovery system in the large plants, multiple energy recovery device is connected in parallel. The pilot scale system of parallel structure was manufactured, and it was tested the performance by a pilot plant.
역삼투막 해수담수화 공정에서 에너지 회수장치의 운영인자 비교분석을 통한 에너지 효율 최적화 연구
김푸름,김형수,박준영,김태우,김민진,박기태,김지훈 대한상하수도학회 2018 상하수도학회지 Vol.32 No.1
Recently, interest in the development of alternative water resources has been increasing rapidly due to environmental pollution and depletion of water resources. In particular, seawater desalination has been attracting the most attention as alternative water resources. As seawater desalination consumes a large amount of energy due to high operating pressure, many researches have been conducted to improve energy efficiency such as energy recovery device (ERD). Consequently, this study aims to compare the energy efficiency of RO process according to ERD of isobaric type which is applied in scientific control pilot plant process of each 100 m3/day scale based on actual RO product water. As a result, it was confirmed that efficiency, mixing rate, and permeate conductivity were different depending on the size of the apparatus even though the same principle of the ERD was applied. It is believed that this is caused by the difference in cross-sectional area of the contacted portion for pressure transfer inside the ERD. Therefore, further study is needed to confirm the optimum conditions what is applicable to the actual process considering the correlation with other factors as well as the factors obtained from the previous experiments.