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심재혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
수소를 에너지의 매개체로 사용하는 수소경제사회의 진입을 위해서는 수소를 경제적으로 생산하는 기술과 함께 수소를 효율적으로 저장하는 기술 개발이 필수적이다. 수소는 상온 상압에서 기체로 존재하기 때문에 부피에 대한 에너지 밀도가 낮고 폭발 위험성이 매우 높다. 이러한 문제를 해결하기 위해 원자 상태의 수소를 포함하는 고체 물질에 대한 관심이 증가하고 있으며 특히 금속수소화물을 고체 수소저장 재료로 활용하려는 연구가 활발히 진행되고 있다. 금속재료를 수소저장 용도가 아닌 수소 분리 또는 정제 용도로 활용하려는 시도도 꾸준히 진행되고 있다. 팔라듐은 이미 예전부터 수소투과 성능이 잘 알려져 있어서 혼합가스로부터 수소만을 분리하는 금속분리막으로 꾸준히 활용되어 왔으나 높은 가격으로 인하여 비팔라듐계 금속분리막에 대한 관심이 증대되고 있다. 특히 바나듐은 높은 수소투과도와 상대적으로 낮은 가격으로 인하여 비팔라듐계 금속분리막으로 유망하여 다양한 합금 형태로 연구가 진행되고 있다. 본 발표에서는 금속계 수소저장 재료와 수소분리막로 개발하기 위한 최근 연구 결과를 소개하고 향후 응용 전망에 대하여 발표하고자 한다.
압축 압력 및 흑연 조성에 따른 금속수소화물-흑연 성형체의 축 방향과 반지름 방향 열전도도 평가
이평종,김종원,배기광,강경수,정성욱,정광진,채재병,이기봉,박주식 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
금속수소화물 분말의 열전도도 및 부피저장밀도를 향상시키기 위하여 높은 열전도도와 낮은 밀도를 가진 흑연을 혼합하고 압축하여 성형체를 만드는 방법이 사용된다. 많은 종류의 흑연 중 팽창 천연 흑연은 압축하여 성형체 제조시 반지름 방향으로 배열이 되기 때문에 금속수소화물-흑연 성형체는 축 방향 및 반지름 방향의 열전도도가 달라지게 된다. 따라서, 본 연구에서는 축 방향 및 반지름 방향의 열전도도 측정이 가능하도록 개발된 장치를 이용하여 흑연 종류에 따른 열전도도를 비교하였으며 흑연 조성이 금속수소화물-흑연 성형체의 축 방향 및 반지름 방향 열전도도에 미치는 영향을 다룬다.
정광진,김종원,배기광,강경수,정성욱,이평종,채재병,박주식 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
수소저장용기 내 금속수소화물은 수소를 흡착하고 탈착하면서 팽창과 수축을 반복하고 불균등하게 미분화된다. 수소를 흡착하면서 팽창한 금속수소화물은 수소 저장용기에 높은 힘을 인가하며 수소저장용기 자체에 손상을 입힐 수 있다. 본 연구는 수소저장용기 내 AB5계 금속수소화물 LCN2 (La<sub>0.9</sub>Ce<sub>0.1</sub>Ni<sub>5</sub>)의 수소 흡착 시 팽창력에 대한 내용을 다룬다. 수소저장용기 내 금속수소화물은 유효 열전도도 향상을 위해서 EG(Expanded Graphite)를 첨가하여 압축성형되었다.
정영관,박규섭 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.4
Numerical analysis, as EAM(Embedded Atom Method), in the atomic level is necessary to analyze the relation between the hydrogen and hydrogen absorption metals. EAM established on density functional theory was developed as a new means for calculating various properties and phenomena of realistic metal systems. In this study, we had constructed the EAM program from constitutive formulae and parameters of the hydrogen, nickel and palladium for the purpose of predicting the expansion behavior on hydrogen absorbing. In result, not only the ground state properties of metals but also lattice constants and the volume expansion ratio of metal hydrides show good agreement with Daw's data and experiment data.
금속수소화물 금속용기로부터 출력변동에 필요한 수소공급에 관한 연구
정영관,김세웅,김경훈,최성대,장태익,황철민 한국수소및신에너지학회 2009 한국수소 및 신에너지학회논문집 Vol.20 No.3
he relation between temperature and hydrogen desorption on variation in output was investigated for the metal hydride canister. For this study, an AB5 type alloy were chosen as a hydrogen storage material in the metal hydride canister. And application to the single proton exchange membrane fuel cell was evaluated. As the results, the hydrogen desorption was linearly increased as the temperature was risen. In addition, metal hydride canister heating was able to correspond the variation of load as power request in the PEMFC system.
금속수소화물 수소 저장 용기 내부의 수소흡장에 대한 수치해석적 연구
남진무,강경문,주현철 한국수소및신에너지학회 2010 한국수소 및 신에너지학회논문집 Vol.21 No.4
In this paper, a three-dimensional hydrogen absorption model is developed to precisely study hydrogen absorption reaction and resultant heat and mass transport phenomena in metal hydride hydrogen storage vessels. The 3D model is first experimentally validated against the temperature evolution data available in the literature. In addition to model validation, the detailed simulation results shows that at the initial absorption stage, the vessel temperature and H/M ratio distributions are uniform throughout the entire vessel, indicating that the hydrogen absorption is so efficient during the early hydriding process and thus local cooling effect is not influential. On the other hand, nonuniform distributions are predicted at the latter absorption stage,which is mainly due to different degrees of cooling between the vessel wall and core regions. This numerical study provides the fundamental understanding of detailed heat and mass transfer phenomena during hydrogen absorption process and further indicates that efficient design of storage vessel and cooling system is critical to achieve fast hydrogen charging and high hydrogen storage efficiency.
기체분무형 공정으로 제조된 Zr계 금속수소화물의 수소화반응 및 Ni-MH 2차전지 전극 특성에 관한 연구
김진호,황광택,김병관,한정섭 한국수소및신에너지학회 2009 한국수소 및 신에너지학회논문집 Vol.20 No.6
The hydriding and electrochemical characteristics of Zr-based AB₂ alloy produced by gas atomization have been extensively examined. For the particle morphology of the as-cast and gas-atomized powders, it can be seen that the mechanically crushed powders are irregular, while the atomized powder particles are spherical. The increase of jet pressure of gas atomization process results in the decrease of hydrogen storage capacity and the slope of plateau pressure significantly increases. TEM and EDS studies showed the increase of jet pressure in the atomization process accelerated the phase separation within grain of the gas-atomized alloy, which brought about a poor hydrogenation property. However, the gas-atomized AB₂ alloy powders produced by jet pressure of 50 bar kept up the reversible H₂ storage capacity and discharge capacity similar to the mechanically crushed particles. In addition, the electrode of gas-atomized Zr-based AB₂ alloy of 50 bar showed improved cyclic stability over that of the cast and crushed particulate, which is attributed to the restriction of crack propagation by grain boundary and dislocation with ch/discharging cycling.
금속수소화물-팽창흑연 복합체의 열전달 특성 및 수소 저장 특성
이평종,김종원,배기광,정성욱,강경수,정광진,박주식,김영호 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.6
Metal hydride is suitable for safe storage of hydrogen. The hydrogen storage kinetics of the metal hydride are highly dependent on its heat transfer characteristics. This study presents a metal hydride-expended graphite composite with improved thermal conductivity and its hydrogen storage kinetics. To improve the heat transfer characteristics, a metal hydride was mixed and compacted with a high thermal conductivity additive. As the hydrogen storage material, AB5 type metal hydride La0.9Ce0.1Ni5 was used. As an additive, flakes-type expended graphite was used. With improved heat transfer characteristics, the metal hydride-expended graphite composite stores hydrogen four times faster than metal hydride powder.
박주식,김종원,배기광,정성욱,강경수,PARK, CHU SIK,KIM, JONG WON,BAE, KI KWANG,JEONG, SEONG UK,KANG, KYOUNG SOO 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.3
Metal hydride based hydrogen storage under moderate temperature and pressure gives the safety advantage over the gas and liquid storage methods. Still solid-state hydrogen storage including metal hydride is below the DOE target level for automotive applications, but it can be adapted to stationary or miliary application reasonably. In order to develop a modular solid state hydrogen storage system that can be applied to a distributed power supply system composed of renewable energy - water electrolysis - fuel cell, the heat transfer and hydrogen storage characteristics of the metal hydride necessary for the module system design were investigated using AB5 type metal hydride, LCN2 ($La_{0.9}Ce_{0.1}Ni_5$). The planetary high energy mill (PHEM) treatment of LCN2 confirmed the initial hydrogen storage activation and hydrogen storage capacity through surface modification of LCN2 material. Expanded natural graphite (ENG) addition to LCN2, and compression molding at 500 atm improved the thermal conductivity of the solid hydrogen storage material.
금속수소화물 수소 저장 용기 내부의 수소방출에 대한 수치해석적 연구
강경문,남진무,유하늘,주현철 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.3
In this paper, a three-dimensional hydrogen desorption model is developed to precisely study the hydrogen desorption kinetics and resultant heat and mass transport phenomena in metal hydride hydrogen storage vessels. The metal hydride hydrogen desorption model, i.e. governed by the conservation of mass,momentum, and thermal energy is first experimentally validated against the temperature evolution data measured on a cylindrical LaNi5 metal hydride vessel. The equilibrium pressure used for hydrogen desorption simulations is derived as a function of H/M atomic ratio and temperature based on the experimental data in the literature. The numerical simulation results agree well with experimental data and the 3D desorption model successfully captures key experimental trends during hydrogen desorption process. Both the simulation and experiment display an initial sharp decrease in the temperature mainly caused by relatively slow heat supply rate from the vessel external wall. On the other hand, the effect of heat supply becomes influential at the latter stages, leading to smooth increase in the vessel temperature in both simulation and experiment. This numerical study provides the fundamental understanding of detailed heat and mass transfer phenomena during hydrogen desorption process and further indicates that efficient design of storage vessel and heating system is critical to achieve fast hydrogen discharging performance.