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공태우(T. W. Kong),이중섭(S. B. Yi),이상철(S. C. Lee),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
LNG Vaporizers must be smaller, more efficient, and easier to operate and maintain. Recently, the vaporizers with greatly enhanced performance as compared to conventional type, have been developed to fulfill these requirements, The vaporizing characteristic of LNG vaporizer with air as heat source has fixed ice. These characteristic has efficient down and total plant cost and installing space can be increase. On that reasons must be optimize through tube and pipes analysis and experiments with enhanced type in this study. In this study performance to the workong characteristics for air heating type vaporizer for super low temperature liquefied gas.
함영복(Y. B. Ham),권순광(S. K. Kwon),공태우(T,W. Kong),윤소남(S. N. Yun),안국영 (K. Y. Ahn) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The hydrogen compressor system with metal diaphragm is operated by oil hydraulic power. It consists of gas head, metal diaphragm, oil head, oil compensating pump, relief valve and plunger etc. An oil compensating pump have been demanded to compensate for an oil leakage in an oil head chamber and a piston head chamber. The oil leakage is occurred through clearance between a plunger and a main cylinder Some quantity of oil overflow through a relief valve. So, the hydrogen compressor system has to have the oil compensating pump, commonly used radial piston type hydraulic pump and coupled operating with main crank shaft. Main components are operated by oil hydraulic components in this system. Therefore, a dynamic simulation model of the hydraulic system using commercial software AMESim tool is developed in this study, included a radial piston type oil compensating pump model, a high speed and a high pressure relief valve model, a plunger driven by crank shaft and system head part included the metal diaphragm etc. A dynamic simulation results presented the operating characteristics of main hydraulic components in this simulation.
함영복(Y. B. Ham),공태우(T. W. Kong),차재곤(J. G. Cha),권순광(S. K. Kwon),안국영(K. Y. Ahn) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The metal diaphragm type hydrogen compressor system is operated by oil hydraulic power, In this system an oil compensating pump have been demanded to compensate for leakage oil head chamber. The oil leakage is occurred two parts, the one is a clearance leakage between plunger piston and main cylinder, the other is an overflow through the relief valve. So, metal diaphragm type hydrogen compressor have to consist of an oil compensating pump, commonly used hydraulic piston pump driven by main crank shaft. The radial piston type oil compensating pump is developed and experimented with new rolling contacted piston mechanism. The search results compared with commonly used line contacted piston and the new rolling contacted piston using ball. The developed the one piston element of the radial piston pump consists of piston having steel ball, return spring two check valves and eccentric cam having ball racer. The volumetric displacement of designed one piston element is 0.437cc/rev. Operating characteristics are tested such as no load to 60bar loaded with every 20bar increasing step, where pressure ripple and flow rate are experimentally investigated.
함영복(Y. B. Ham),공태우(T. W. Kong),차재곤(J. G. Cha),김대명(D. M. Kim),이용범(Y. B. Lee),윤소남(S. N. Yun),박중호(J. H. Park) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
The aim of this study is to develop rotary type energy recovery device(RERD) using hydrostatic pressure exchanger consists of hydraulic pump and hydraulic motor in a single cylinder barrel. This pressure exchanger are developed for brain energy recovery in the sea-water reverse osmosis(SWRO) desalination plant. But it used oil hydraulic axial piston pump for verification of mechanism in this study. In SWRO desalination plants, seawater is pressurized to approximately 60bar. At this pressure, the seawater enters pressure vessels having a RO membrane, which is permeable to pure water. Since the recovery rate is typically 25-35%, the other added seawater rejected by membrane is returned to the sea having pressure energy. In this study, a new type hydrostatic pressure exchanger as RERD with hydraulic piston pump and hydraulic piston motor in a same cylinder barrel is presented It is able to recover the energy from concentrate flow and makes its mechanism more simple. RERD has been evaluated as experimently by compared with various driving condition of electric consumption power.
함영복(Y. B. Ham),차재곤(J. G. Cha),김대명(D. M. Kim),공태우(T. W. Kong),윤소남(S. N. Yun),안국영(K. Y. Ahn),권병수(B. S. Kweon) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.1
This paper presents the experimental results of the radial piston type oil pump with new mechanism for a metal diaphragm hydrogen compressor. Generally, metal diaphragm type hydrogen compressor systems are operated by oil hydraulic power. In this system an oil compensating pump has been demanded to compensate for a leakage oil head chamber. The metal diaphragm type hydrogen compressor consists of an oil compensating pump, commonly used hydraulic piston pump and driven by main crank shaft. The radial piston type oil compensating pump with new rolling contacted piston mechanism is developed and experimented. The developed piston element of the radial piston pump consists of piston, steel ball, return spring, two check valves, eccentric cam and ball racer. In this study, designed 4 type pistons as and orifice hole. Operating characteristics and pressure ripple characteristics are tested under no load to 60bar loaded with every 20bar increasing step and pressure ripple and flow rate are experimentally investigated.