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RISS 인기검색어
- 검색키워드
- 주제어 : Reciprocating pump (왕복동 펌프) (검색결과 7 건)
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김현세,함영복 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.3
Until recently, ships, automobiles, and drones using hydrogen energy are being actively researched. In addition, stations and facilities for hydrogen supply are being developed widely. Among them, a hydrogen pump is necessary for compressing it and transfer to other stations. The liquid hydrogen pump is operated at very high pressure up to 90 MPa. In our research, a reciprocating plunger pump is studied. Especially, a leakage in a liquid hydrogen pump is predicted using a finite element method. As a result, it was found that leak mass flow rates changed from 0.09 to 2.20 kg/h, when the gaps were given from 2 to 6 μm. Thus pump efficiencies were calculated from 99.9 to 97.9%, when the gaps changed from 2 to 6 μm. These results are useful for the design of the liquid hydrogen pump.
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유압 비례제어 밸브와 유압실린더를 이용한 액화질소 펌프의 왕복동 구동
유공압건설기계학회 유공압건설기계학회 2024 유공압건설기계학회 학술대회논문집 Vol.2024 No.5
This study focuses on the development of a closed-loop controlled hydraulic system designed for the efficient transport and storage of liquefied hydrogen. Given the high energy density and the environmentally friendly nature of hydrogen, the research emphasizes the need for advanced technologies capable of handling hydrogen in its liquefied form at high pressures. The core of the system is a reciprocating plunger pump, deemed suitable for pumping liquefied hydrogen due to its ability to operate at pressures exceeding 90 MPa. This is crucial for charging vehicles' hydrogen tanks, which require gaseous hydrogen at 75 MPa. To achieve precise control over the pump operation, the study employs a double-rod hydraulic cylinder driven by a sinusoidal motion, with its displacement being continuously monitored and fed back to a hydraulic proportional directional control valve. This valve, characterized by its feedback mechanism for spool position and built-in signal amplification, ensures smooth and shock-free operation across all ports during the reciprocating motion of the pump. The paper details the specifications of both the proportional control valve and the double-rod cylinder, highlighting the importance of maintaining oil viscosity within a specified range under varying temperatures to ensure efficient operation. Through experimental setups using liquefied nitrogen, the study showcases the system’s capability to handle no-load conditions effectively, simulating the operational demands of liquefied hydrogen pumping. Conclusively, this research presents a sophisticated hydraulic system capable of meeting the high-pressure requirements for liquefied hydrogen transport and storage, promising to advance the infrastructure needed for hydrogen fueling stations. The findings contribute to the broader efforts of integrating hydrogen as a sustainable and clean energy resource, particularly in the transportation sector.
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액화수소 펌프 구조 및 내부 유로 유한요소해석 및 설계
김현세(HYUNSE KIM),함영복(YOUNG-BOG HAM),박중호(JUNG-HO PARK) 한국수소및신에너지학회 2025 한국수소 및 신에너지학회논문집 Vol.36 No.5
Recently, as climate crisis has arisen, various researches about clean energy are actively performed. One of promising solutions is hydrogen energy, which only emits water when it is used in fuel cell electric vehicles. For carrying and storing them, high pressure pumps are necessary. In this article, a reciprocating liquid hydrogen pump is designed using a finite element method (FEM). Flow analysis results showed that the maximum flow velocity of a Y-type (37° angle) decreased to 1.1 m/s by 38.9% compared to a T-type of 1.8 m/s. Whereas, the maximum pressure of a Y-type (48° angle) decreased to 297.0 Pa by 59.4% compared to a T-type of 731.5 Pa. This result can be applied to design the pump more effectively.
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