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백승문(S. M. Baek ),설원실(W. S. Seol ),이호생(H. S. Lee ),윤정인 (J. I. Yoon ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The heat transfer performance of plate heat exchanger decreases as time goes by. The main reason for this phenomenon causes by the fouling on plate of heat exchanger. To remove the fouling, we have usually cleaned the plate of heat exchanger using chemicals or polishing by brush or cloth with hand after stopping the equipment and disassembling heat exchanger. But, to clean the plate using this method, the equipment needs to be stopped and disjointed heat exchanger. And we need to re-joint after cleaning. Especially, the concern of environmental pollution happens in case of using chemicals. Therefore, we need to develop automatic fouling removal equipment which can keep high heat transfer efficiency continuously and solve the problem of environmental pollution. So, in this paper, we developed and tested the equipment which can clean the fouling on plate heat exchanger automatically per constant period and interval using air bubble. The total heat transfer coefficient decreased with slower tendency on occasion of using air bubble than that of the existing method. Also, it was revealed that the variation of total heat transfer coefficient was affected by water velocity.
플레이트 열교환기의 공기방울에 의한 파울링 제거 및 용존산소 제거 효과
오태산(T. S. Oh),백승문(S. M. Baek),설원실(W. S. Seol),이호생(H. S. Lee),김현주(H. J. Kim),윤정인(J. I. Yoon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presents an effect of air bubbles in a plate heat exchanger on fouling & dissolved oxygen removal. Fouling is the deposit that disturbs heat transfer on the heat exchanger surface. As a result the heat transfer performance of heat exchanger plate decreases as time goes by. It has developed and tested the equipment which can clean the fouling on heat exchanger plates automatically per constant period and interval using air bubbles. Value of dissolved oxygen showed lower more than 11% when using both an air separator and dissolved oxygen eliminator compared to using only an air separator.
열교환기 파울링 자동 제거장치 최적화를 위한 세정 볼 실험에 관한 연구
김재돌(J. D. Kim),설원실(W. S. Seol) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The experiment was performed to optimize cleaning effect on heat exchanger for optimizing fouling auto removal apparatus using cleaning ball. Through this study we got the following results. Lattice space of ball separator is allowed 6∼10.3mm in ranges of ball diameter are 15∼25mm and when mass flow of cooling water is 3.0m/sec. We limit the range of velocity of flow 1.4∼2.6m/sec into ball separator to decide the mass flow of ball circulation pump. Balls were inputted immediately in case of velocities of flow are 2.4 and 2.6m/sec, balls were inputted smoothly in case of velocities of flow are 2:0 and 2.2m/sec, balls were inputted slowly, but they were not inputted less than 1.8m/s in case of velocities of flow are 1.8m/sec. when the velocity of flow is constant, pass time is decreased as a decreasing of cleaning ball diameter. When velocity of flow is 2.4m/sec, maximum ball diameter is 21.0mm in case of 17mm inner diameter. Average of pass time of balls is 1.15∼2.79sec depend on the velocity of flow and the size of balls. As a result, an auto fouling elimination system using cleaning ball was more effective than existing mechanically cleaning system in the visual.