• Title/Summary/Keyword: Hydrogen Storage System

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The study on the Hydrogen Characteristics of MmNi4.5Mn0.5 Hydrogen Storage Alloy (MmNi4.5Mn0.5계 수소저장합금의 수소화 특성에 관한 연구)

  • Kang, Kil-Ku;Kang, Sei-Sun;Kwon, Ho-Young;Lee, Rhim-Youl
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.2
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    • pp.151-158
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    • 2002
  • The hydorgen storage alloys were produced by melting in arc melting furnace and then solution heat treated at $1,100^{\circ}C$ followed by pulverization. The chemical analysis on the samples showed that the major elements of misch metal(Mm) were La, Ce, Pr and Nd with impurity less than 1wt.%. X-ray diffraction indicated that the structure for these samples were a single phase of hexagonal with $CaCu_5$ type. Compared to the initial particle size $100{\sim}110{\mu}m$, the many fine cracks were found and particle size decreased to $14{\mu}m$ for $MmNi_{4.5}Mn_{0.5}$ after hydriding/dehydring test run. To activate the sample the vessel filled with hydrogen storage alloys was first evacuated for for at $70^{\circ}C$ and then treated for 10.5hr under hydrogen pressure of 20atm for $MmNi_{4.5}Mn_{0.5}$ alloy. The experimental data showed that the hydrogen storage alloy of $MmNi_{4.5}Mn_{0.5}$ had superior adsorption and description properties within a temperature rang of $40^{\circ}C{\sim}80^{\circ}C$ and also they had a good P-C-T curve.

The Hydrogen Storage Characteristics of Ti-Cr-V Alloys (Ti-Cr-V 합금의 수소저장 특성)

  • Cho, Sung-Wook;Han, Chang-Suck;Park, Choong-Nyeon
    • Transactions of the Korean hydrogen and new energy society
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    • v.9 no.1
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    • pp.31-37
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    • 1998
  • The crystal structures, the lattice parameters and the characteristics of hydrogen storage at 303K has been investigated in the ternary alloys of Ti-Cr-V system. All of these alloys, in the range of this study, have shown a bcc structure. The hydrogen storage capacities and the effective hydrogen storage capacities of the alloys were strongly dependant on the composition ratio of Ti/Cr, showing their maximum values at the Ti/Cr ratio of about 0.75. It was also found that the lattice parameters of the alloys increased linearly with an increase of the Ti/Cr ratio. The differences in affinities to hydrogen and lattice parameters of pure metal states of the three elements have been adopted in oder to explain the Ti/Cr ratio dependance of the lattice parameter and hydrogen storage capacity of the alloys.

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Material Life Cycle Assessment on Mg2NiHx-CaF2 Composites (Mg2NiHx-CaF2 수소 저장 복합체의 물질 전과정 평가)

  • HWANG, JUNE-HYEON;SHIN, HYO-WON;HONG, TAE-WHAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.2
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    • pp.148-157
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    • 2022
  • Research on hydrogen storage is active to properly deal with hydrogen, which is considered a next-generation energy medium. In particular, research on metal hydride with excellent safety and energy efficiency has attracted attention, and among them, magnesium-based hydrogen storage alloys have been studied for a long time due to their high storage density, low cost, and abundance. However, Mg-based alloys require high temperature conditions due to strong binding enthalpy, and have many difficulties due to slow hydrogenation kinetics and reduction in hydrogen storage capacity due to oxidation, and various strategies have been proposed for this. This research manufactured Mg2Ni to improve hydrogenation kinetics and synthesize about 5, 10, 20 wt% of CaF2 as a catalyst for controlling oxidation. Mg2NiHx-CaF2 produced by hydrogen induced mechanical alloying analyzed hydrogenation kinetics through an automatic PCT measurement system under conditions of 423 K, 523 K, and 623 K. In addition, material life cycle assessment was conducted through Gabi software and CML 2001 and Eco-Indicator 99' methodology, and the environmental impact characteristics of the manufacturing process of the composites were analyzed. In conclusion, it was found that the effects of resource depletion (ARD) and fossil fuels had a higher burden than other impact categories.

Study on Thermal Performance Characteristics of CPC System Depending on Weather Conditions and Capacity of Heat Storage Tank (기상 조건과 축열조 용량에 따른 복합 포물형 집열기(CPC) 시스템의 열적 성능 특성에 관한 연구)

  • LIM, SOK-KYU;JUNG, YOUNG GUAN;KIM, KYOUNG HOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.1
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    • pp.58-66
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    • 2019
  • Static compound parabolic collectors (CPCs) have advantages such as ease for fabrication and lower cost compared with other concentrating collectors. In this study, thermal performance analysis of CPC employing heat storage tank was carried out. The clearness index and capacity of heat storage tank are taken as the main parameters for numerical simulation. The effects of the parameters on the hourly and daily system performances ncluding the useful energy, heat loss, and collector efficiency were numerically investigated. Results showed that the system has a potential for efficient recovery of solar thermal energy.

Thermal Performance Analysis of Compound Parabolic Collector (CPC) System Employing Storage Tank Through a Year (축열조를 채용한 복합 포물형 태양열 집열기(CPC) 시스템의 연중 열적 성능 해석)

  • LIM, SOK-KYU;JUNG, YOUNG GUAN;KIM, KYOUNG HOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.4
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    • pp.376-383
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    • 2019
  • This paper presents of thermal performance analysis by using mathematical models for a compound parabolic collector (CPC) system employing heat storage tank. The thermal performance including insolation energy, heat loss from collector system, useful energy, collector efficiency, and temperature of storage tank were theoretically investigated through a year using monthly-average meteorological data at Seoul. The simulated results showed that the CPC systems are suitable for the applications of higher temperature than flat plate collector (FPC) systems.

A Study for Key Points of PSM to Guarantee the Safety of Liqufied Hydrogen Storage Tank (액화수소 저장탱크 안전성 확보를 위한 PSM 중점사항에 관한 연구)

  • Myoung Sun Wu;Chang Jun Lee
    • Korean Chemical Engineering Research
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    • v.61 no.1
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    • pp.74-79
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    • 2023
  • As the demand for hydrogen increases, the facilities for storing hydrogen has been important, and a few laws for hydrogen facilities should be complied. According to the Occupational Safety and Health Act in Korea, in case liquid hydrogen with a storage capacity of 5 tons or more is handled, a Process Safety Management (PSM) system should be complied. However, there are some standards which are not proper for flammable low-temperature liquefied substances on the current Occupational Safety and Health Act. In this study, 7 key points in process safey information and safety operation procedures among PSM components are suggested and how these key points should be improved is derived based on scientific analysis.

Study on Hydrogen Effect in TIG Welded Stainless Steel (TIG 용접된 스테인리스강의 수소영향에 대한 연구)

  • Lee, Jin-Kyung;Lee, Sang-Pill;Bae, Dong-Su;Lee, Joon-Hyun
    • Journal of Power System Engineering
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    • v.20 no.6
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    • pp.58-63
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    • 2016
  • A stainless steel has high corrosion resistance because of nickel in material, so it is used as materials for transportation and storage of hydrogen. In this study, TIG(tungsten ingot gas) welding was carried out on the stainless steel using the storage vessel of hydrogen. The microscopic structures at each region of TIG welded material such as HAZ, weld and base metals using optical microscope were observed. And the damage behavior of stainless steel that underwent the hydrogen charging using nondestructive evaluation was also studied. Ultrasonic test, which is the most generalized nondestructive technique, was applied to evaluate the relationship between the ultrasonic wave and mechanical properties at each zone of TIG welded stainless steel. The velocity and attenuation coefficients of ultrasonic wave didn't show a remarkable difference at each region of welded stainless steel. However, the attenuation coefficient was the highest at the weld zone when hydrogen charged stainless steel. In addition, acoustic emission test was also used to study the dynamic behavior of stainless steel experienced both hydrogen charging and weld. Lots of AE event at elastic region of stress-strain curve were occurred both the hydrogen charged specimen and the free specimen.

A Study on the Production of Hydrogen Energy According to Installed Capacity of Energy Storage System on Campus (대학 캠퍼스 내 에너지저장장치 연계에 따른 잉여 수소에너지 생산에 관한 연구)

  • Choi, Bong-Gi;Jun, Jong-Hyun;Kim, Sung-Yul
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.94-99
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    • 2018
  • Depending on how the energy storage system(ESS) is used in a system that can construct a microgrid by using an independent power source such as campus, surplus power can be generated that can not be charged to the ESS. For example, assuming that heat is supplied by a fuel cell in the case of a system in which thermal self-sustaining is prioritized, the fuel cell capacity required differs depending on the heat load. The amount of surplus power that can not be stored in the ESS will appear differently depending on the load operation of the fuel cell for each cycle. This power is hydrogenated through a water electrolytic device to present the amount of hydrogen energy that can be operated for each cycle. Therefore, this paper propose the possibility of utilizing University campus as a hydrogen station.

Modeling of SPE cell for hydrogen production using EMTDC (EMTDC를 이용한 수소제조용 SPE 셀의 모델링)

  • Kim Se-Heon;Park Min-won;Yu In-Keun
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1495-1497
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    • 2004
  • This paper presents an effective modeling scheme of SPE cell system for hydrogen production. As oxygen and hydrogen produced by water electrolysis using SPE are high purity, we can use oxygen in biomedical and hydrogen could be used in many ways. Recently, it is under the eye as a surplus power storage system. PSCAD/EMTDC model of SPE cell system for hydrogen production to efficiently utilize Solar cell energy which produces effectively hydrogen energy is showed in this paper. The simulated results are then verified by comparing them with the actual values obtained from the data acquisition system. Authors are sure that it is a useful method to the researchers who study SPE cell system for hydrogen production.

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