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반응성 기계적 분쇄에 의해 제조한 Mg-10wt.% MnO의수소 저장 성질
송명엽,배종수,권익현,권성남,박찬기 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.1
수소 분위기에서 10wt.%MnO와 기계적인 분쇄(반응성 기계적 분쇄)에 의해 Mg의 수소 저장 성질을 향상시켰다. 회전 속도는 250 rpm, 밀링시간은 2 h, 그리고 시료 대 볼 중량비는 1/45이었다. 준비한 Mg-10wt.%MnO 시료는 활성화를 위한 수소화물 형성 분해 싸이클링이 필요없었으며, 첫 번째 싸이클 593K 12 bar H2에서, 10분 동안에 3.12wt.%, 60분 동안에 3.95wt.%의 수소를 흡수하였다. 또한 Mg-10wt.%MnO는 593K 0.8 bar H2에서 60분 동안에 2.12wt.%의 수소를 방출하였다. MnO와 Mg의 방응성 분쇄는, 핵생성을 용이케 하고 (Mg 입자의 표면에 결함 형성과 첨가물에 의해), Mg 입자의 표면에 crack을 만들어 Mg의 입자 크기를 줄여 그 결과 수소 원자의 확산 거리를 작게 함으로써 수소 흡수 방출 속도를 증가시킨다. 수소화물 형성 분해 싸이클링은 Mg 입자의 표면에 crack을 만들고 Mg의 입자 크기를 줄여 수소 흡수 방출 속도를 증가시킨다.
수소 기술-경제체제로의 이행을 위한 장단기 시나리오 분석
최현도,박상욱,이민규 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.3
최근 수소에너지가 환경문제를 해결해 줄 수 있는 대체에너지로 각광받으면서 수소에너지의 사용이 가지고 올 새로운 에너지 체제에 대한 시나리오 연구가 다양하게 수행되고 있다. 수소 기술-경제체제의 가능한 시나리오를 제시하는 것은 미래 사회에서 수소가 에너지 운반체로서 담당하게 될 역할을 명확히 할 수 있음과 동시에 에너지라는 거대한 기술-경제체제의 변화를 위해 현재 수행해야 할 에너지 정책과 전략에 대해 큰 시사점을 줄 수 있기에 의미가 있다.본 연구는 수소의 생산, 저장 및 운반, 그리고 응용분야에서의 다양한 기술의 SWOT 분석을 통해 가능한 시나리오를 단기와 장기로 나누어 제시했다. 그 결과 앞으로의 수소 기술-경제체제의 구조는 기술적 완성도 뿐 아니라 사회적 수용성, 사회적 적응성 등 외부의 환경변화에도 많은 영향을 받음을 알았다. 그렇기 때문에 수소에너지에 관한 전략과 정책은 이러한 변동을 충분히 고려하면서 결정돼야 한다.
황-요오드 수소 제조 공정에서 저온 분젠 반응의 상 분리 특성
한상진,이광진,김효섭,김영호,박주식,배기광,이종규 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
The Sulfur-Iodine(SI) thermochemical hydrogen production process consists of three sections, which are so called the Bunsen reaction section, the H_2SO_4 decomposition section and the HI decomposition section. In order to identify the phase separation characteristics in the reaction conditions with the high solubility of SO_2, we conducted the Bunsen reaction at the low temperatures, ranging from 283 to 298K, with the I_2/H_2O molar ratios of 2.5/16.0 and 3.5/16.0. The molar ratios of HI/H_2SO_4 products obtained from low temperature Bunsen reactions were ca. 2, indicating that there were no side reactions. The amount of reacted SO_2 was increased with decreasing the temperature, while the amounts of unreacted I_2 and H_2O were decreased. In the phase separation of the products, the amount of a H_2SO_4 impurity in HI_x phase was increased with decreasing the temperature, though the temperature has little affected on HI and I_2 impurities in H_2SO_4 phase.
휴대용 파워팩을 위한 소형 세라믹 리니어 엔진 설계 및 동적 특성에 관한 연구
오용일,김강출,임옥택 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
Current rechargeable battery cannot provide high energy density and the operational durations required. But linear engine/generators provide high energy density for portable power applications because fuel is more high density. In this paper, we suggest that basic design of powerpack using linear engine for assisting power output. Efficiency is relatively high because linear engine don’t have crank mechanism compared with rotary engine. We made prototype engine and had experiments to know moving characteristic about the Linear Engine. It was possible to operate velocity at 50 Hz at the firing and pressure in cylinder was 16bar.
김재훈,노용규,전의식,이종현 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
A fuel cell vehicle using a polymer electrolyte membrane fuel cell (PEM FC) as power source produces electric power by consuming the fuel, hydrogen. The unconsumed hydrogen is recirculated and reused to gain higer stack efficiency and to maintain the humidity in the anode side of the stack. So it is needed considering fuel efficiency to recirculated hydrogen. In this study, the indirect hydrogen recirculation flow rate measurement method for fuel cell vehicle is presented. By modeling of a convergent nozzle ejector and a hydrogen recirculation blower for the hydrogen recirculation of a PEM FC, the hydrogen recirculation flow rate was calculated by means of the mass balance and heat balance at Anode In/Outlet.
연료전지자동차의 고압수소저장시스템 국부화재 신뢰성 평가 [I]
김상현,최영민,황기호,심지현,황인철,임태원 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
In recent years, it is very important that hydrogen storage system is safe for user in any circumstances in case of crash and fire. Because the hydrogen vehicle usually carry high pressurized cylinders, it is necessary to do safety design for fire. The Global Technical Regulation (GTR) has been enacted for localized and engulfing fire test. High pressure hydrogen storage system of fuel cell electrical vehicles are equipped with Thermal Pressure Relief Device (TPRD) installed in pressured tank cylinder to prevent the explosion of the tank during a fire. TPRDs are safety devices that perceive a fire and release gas in the pressure tank cylinder before it is exploded. In this paper, we observed the localized and engulfing behavior of tank safety, regarding the difference of size and types of the tanks in accordance with GTR.
조병학,양동순,박신열,최경식,박병철 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
A 50 kW class rotating body type wave energy converter consisted of two floating bodies and a PTO (Power Takeoff) unit is studied. As an wave energy extractor, the body is designed to have a VLCO (Variable Liquid-Column Oscillator) having a liquid filled U-tube with air chambers. Owing to the oscillation of the liquid in the U-tube caused by the air spring effect of the air chambers, the amplitude of response of the VLCO becomes significantly amplified for a target wave period. The PTO converts the rotational moment introduced from the relative motion of the hinged bodies to an hydraulic power by means of a cylinder. A high pressure accumulator, hydraulic motor and a generator are equipped in the PTO to convert the hydraulic power to electric power. A control law for adjusting the oscillation period of the VLCO is proposed for the efficient operation of the VLCO with various wave conditions. It is found that the effect of the air spring has an important role to play in making the oscillation of the VLCO match with the ocean wave. In this way, the wave energy converter equipped with the VLCO provides the most effective mode for extracting energy from the ocean wave.
프리피스톤 수소기관의 연소안정화 및 성능향상에 관한 연구
노기철,이종태,윤재성,김강문,박상욱 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.3
A free-piston hydrogen fueled engine is considered as one of the next power systems which is able to obtain high efficiency and low emission, simultaneously. In this study, in order to ensure the possibility as the next generation power system, the combustion characteristics and the performance of the free-piston hydrogen fueled engine are analyzed by using the linear RICEM for the change of injection pressure and equivalence ratio.As the results, in-cylinder maximum pressure is shown at injection pressure Pinj=6bar. Backfire phenomenon is not observed under experimental condition and knock occurs over φ=0.8. The thermal efficiency is the highest at injection pressure, Pinj=6bar and equivalence ratio, φ=0.7, respectively.
주현규,심은정,이재민,윤재경 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
Anodized tubular TiO_2 electrodes (ATTEs) with three noticeably different lengths are prepared to determine their optimum length for the photo-driven activity in the reaction of Cr(VI) reduction and hydrogen evolution. The ATTEs with ethylene glycol have longer TiO_2 tubes (7-15.6 μm) than those with hydrfluoric acid (0.6-0.8 μm). These samples, which differ only in the length of the tubes, with a wall thickness of ca. 20 nm, consist mainly of an anatase crystalline phase after heat treatment at 650℃, since the anatase crystallites at the tube walls do not undergo transformation into rutile phase, due to the constraints imposed by the wall thickness. Among them, the medium size (ca. 8 μm) tubes provide the optimum conditions, irrespective of the light intensity, which is explained in terms of the correlation between the amount of photons and the adsorbed electron acceptors and their location. Photocatalytic Cr(VI) reduction leads to ca. 60% reduction of Cr(VI) even under 1 sun irradiation with the medium-sized anodized TiO_2 tubes, but only ca. 20% with the short- and long-sized tubes. For hydrogen evolution, tubes longer than 8 μm do not exhibit better performance with any light intensity.
TPO/R를 이용한 [Fe_2O_3, WO_3]/지지체의 산화, 환원 특성 연구
김재호,강경수,배기광,김영호,김창희,조원철,박주식 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.4
The three-reactor chemical-looping process (TRCL) for the production of hydrogen from natural gas is attractive for both CO_2 capture and hydrogen production. In this study, redox property of Fe_2O_3 and WO_3supported with ZrO_2 and MgAl_2O_4 were studied with temperature programmed oxidation/reduction (TPO/R)experiment. All metal oxides were prepared by ball mill method. Metal oxides supported with ZrO_2 showed the good redox property in TPO and TPR tests. Reduction behavior was matched well the theoretical reduction mechanism. Metal oxides supported with MgAl_2O_4 formed a solid solution (MgFe_0.6Al_1.4O_4, MgWO_4). Fe_2O_3showed more narrow reaction range and lower reaction temperature than WO_3.