• Title/Summary/Keyword: 수소충전량

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Study of the Characteristics of Hydrogen-Gas Filling Process of Ultra-Light Composite Tanks for Fuel-Cell Vehicles (연료전지자동차용 초경량 복합재료 탱크의 수소 충전 특성 연구)

  • Yoo, Gye-Hyoung;Kim, Jong-Lyul;Lee, Taek-Su;Lee, Joong-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.7
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    • pp.813-819
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    • 2011
  • In this research, we investigated the hydrogen-gas filling characteristics of ultra-light composite tanks that have a plastic or aluminum liner inside the composite shell. The study was performed for different gas and tank temperatures. The temperature changes at various positions in the Type-4 tank during hydrogen-gas filling were monitored in order to understand the effects of the filling conditions. The results were compared with those obtained for a Type-3 tank. As the filling speed was increased, a quicker temperature rise was observed, and the temperature distribution over the entire region showed significant discrepancies.

Evaluation of Metering Accuracy of Hydrogen Station Using Master Meter Method (표준유량계법을 적용한 수소 충전소 계량 정확도 평가)

  • Han, Wonguk;Yim, Sangsik;Song, Bohee;Kil, Sunghee;Kim, Younggyu;Kim, Hongchul
    • Journal of the Korean Institute of Gas
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    • v.23 no.6
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    • pp.67-73
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    • 2019
  • Hydrogen is difficult to accurately measure the amount of charge due to sudden temperature changes and pressure rise when charging the vehicle. In order to construct a hydrogen infrastructure, it is important to precisely measure the amount of charge that can be a sensitive issue in commercial transactions. In this study, the accuracy of metering of domestic hydrogen stations was evaluated as a study for metering management of hydrogen dispenser. For the experiment, we constructed metering system using master meter method and measured the flow rate in the actual hydrogen vehicle charging environment. As a result of error occurred about 10% on average, and the hydrogen loss per one charge was found to be up to 60g.

CFD procedure of Multi-phase flow to predict the trend of Boil-off for the various filling ratio of C-Type liquefied hydrogen tank subject to sloshing motion (슬로싱에 놓인 C-Type 액화수소 탱크의 적재율에 따른 BOG 발생량 경향 예측을 위한 다상 유동 CFD 해석 절차)

  • Jin-Ho Lee;Sung-Je Lee;Se-Yun Hwang;Jang Hyun Lee
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.06a
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    • pp.213-213
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    • 2022
  • 본 논문은 슬로싱(Sloshing) 거동에 놓인 극저온 액체수소 화물창의 BOG 예측을 위한 CFD 해석 절차를 다루고 있다. 특히, 적재율(Filling Ratio)에 따라 달라지는 열 유입과 그에 따른 액체수소의 기화 경향을 파악하기 위한 목적으로 수행되었다. 액체수소와 기체수소의 혼재에 의한 다상 열유동(Multiphase-Thermal flow) 특성을 반영하고 유동에 따른 강제 대류 현상을 열유속에 반영하기 위한 CFD 해석을 수행하였다. 다상 유동 모델의 정확성을 검증하기 위하여 슬로싱 실험의 압력 계측 값과 해석의 압력 값 및 자유수면(Free surface) 형상을 비교하였다. 소형 C-Type 독립형 액화수소 탱크를 대상으로 슬로싱 유동과 BOG 발생을 수치적으로 예측하였다. 해석 과정에서 VOF(Volume of fraction) 모델과 Eulerian 모델을 모두 적용하여, 액체수소에 유입되는 열 유속(Heat flux)의 예측 정확성을 비교하였다. 슬로싱 유무에 따라 액체수소에 유입되는 열 유속을 비교하여 슬로싱 유동의 포함 여부에 따른 BOG 발생량의 변화를 제시하였으며, 최종적으로 액체수소의 충전율(Filling ratio) 별로 BOG 발생량의 경향성을 제시하였다.

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Hydrogen Compressor Cycle Analysis for the Operating Pressure of 50 MPa and High Charging Capacity (50 MPa급 대용량 수소압축기 사이클 해석)

  • Song, Byung-Hee;Myoung, No-Seuk;Jang, Seon-Jun;Kwon, Jeong-Tae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.2
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    • pp.66-73
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    • 2020
  • In the hydrogen compression cycle, which is currently being developed, hydrogen is compressed to a very high pressure using a compressor, and then stored and used in a high-pressure vessel. This shows that an increase in the temperature of hydrogen in the vessel due to a pressure rise during the filling process and the pressure fatigue due to the repeated cycle may cause problems in the reliability of the vessel. In this paper, for the entire processes in a 50 MPa hydrogen compression system, theoretical and numerical methods were conducted to analyze the following: the temperature increase of hydrogen in the vessel and the time required to reach thermal equilibrium with the surroundings, the change in temperature of hydrogen passing through the pressure reducing valve, and the required capacity of the heat exchanger for cooling the vessel. The results will be useful for the design and construction of hydrogen compression systems, such as hydrogen charging stations.

3D Explosion Analyses of Hydrogen Refueling Station Structure Using Portable LiDAR Scanner and AUTODYN (휴대형 라이다 스캐너와 AUTODYN를 이용한 수소 충전소 구조물의 3차원 폭발해석)

  • Baluch, Khaqan;Shin, Chanhwi;Cho, Yongdon;Cho, Sangho
    • Explosives and Blasting
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    • v.40 no.3
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    • pp.19-32
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    • 2022
  • Hydrogen is a fuel having the highest energy compared with other common fuels. This means hydrogen is a clean energy source for the future. However, using hydrogen as a fuel has implication regarding carrier and storage issues, as hydrogen is highly inflammable and unstable gas susceptible to explosion. Explosions resulting from hydrogen-air mixtures have already been encountered and well documented in research experiments. However, there are still large gaps in this research field as the use of numerical tools and field experiments are required to fully understand the safety measures necessary to prevent hydrogen explosions. The purpose of this present study is to develop and simulate 3D numerical modelling of an existing hydrogen gas station in Jeonju by using handheld LiDAR and Ansys AUTODYN, as well as the processing of point cloud scans and use of cloud dataset to develop FEM 3D meshed model for the numerical simulation to predict peak-over pressures. The results show that the Lidar scanning technique combined with the ANSYS AUTODYN can help to determine the safety distance and as well as construct, simulate and predict the peak over-pressures for hydrogen refueling station explosions.

A Numerical Analysis on the Stress Behavior Characteristics of a Pressure Vessel for Hydrogen Filling by FEM (유한요소법을 이용한 수소충전용 압력용기의 응력 거동특성에 관한 수치적 연구)

  • Chol, Seunghyun;Byonl, Sung Kwang;Kim, Yun Tae;Choi, Ha Young
    • Journal of the Korean Institute of Gas
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    • v.26 no.3
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    • pp.38-44
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    • 2022
  • As the supply of hydrogen charging stations for hydrogen supply accelerates due to the hydrogen economy revitalization policy, the risk of accidents is also increasing. Since most hydrogen explosion accidents lead to major accidents, it is very important to secure safety when using hydrogen energy. In order to utilize hydrogen energy, it is essential to secure the safety of hydrogen storage containers used for production, storage, and transportation of liquid hydrogen. In this paper, in order to evaluate the structural safety of a hydrogen-filled pressure vessel, the behavioral characteristics of gas pressure were analyzed by finite element analysis. SA-372 Grade J / Class 70 was used for the material of the pressure vessel, and a hexahedral mesh was applied in the analysis model considering only the 1/4 shape because the pressure vessel is axisymmetric. A finite element analysis was performed at the maximum pressure using a hydrogen gas pressure vessel, and the von Mises stress, deformation, and strain energy density of the vessel were observed.

An Analysis on the Temperature Changes and the Amount of Charging of Hydrogen in the Hydrogen Storage Tanks During High-Pressure Filling (고압 충전 시 수소 저장 탱크의 온도 변화 및 충전량에 관한 해석)

  • LI, JI-QIANG;LI, JI-CHAO;MYOUNG, NO-SEUK;PARK, KYOUNGWOO;JANG, SEON-JUN;KWON, JEONG-TAE
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.3
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    • pp.163-171
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    • 2021
  • Securing energy sources is a key element essential to economic and industrial development in modern society, and research on renewable energy and hydrogen energy is now actively carried out. This research was conducted through experiments and analytical methods on the hydrogen filling process in the hydrogen storage tank of the hydrogen charging station. When low-temperature, high-pressure hydrogen was injected into a high-pressure tanks where hydrogen is charged, the theoretical method was used to analyze the changes in temperature and pressure inside the high-pressure tanks, the amount of hydrogen charge, and the charging time. The analysis was conducted in the initial vacuum state, called the First Cycle, and when the residual pressure was present inside the tanks, called the Second Cycle. As a result of the analysis, the highest temperature inside the tanks in the First Cycle of the high-pressure tank increased to 442.11 K, the temperature measured through the experiment was 441.77 K, the Second Cycle increased to 397.12 K, and the temperature measured through the experiment was 398 K. The results obtained through experimentation and analysis differ within ±1%. The results of this study will be useful for future hydrogen energy research and hydrogen charging station.

Electrode Fabrication and Electrochemical Characterization of a Sealed Ni-MH Battery for Industrial Use (산업용 밀폐형 니켈수소전지의 전극 제조 및 전기화학적 특성)

  • An, Yang-Im;Kim, Sae-Hwan;Jo, Jin-Hun;Kim, Ho-Sung
    • Journal of the Korean Electrochemical Society
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    • v.11 no.4
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    • pp.289-296
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    • 2008
  • Electrochemical studies were performed by a half-cell test for the nickel hydroxide (cathode) and hydrogen storage alloy(anode) electrodes for the sealed Ni-MH batteries applicable to industrial use. The electrodes were fabricated and checked a charge efficiency and an internal pressure of the battery during charge-discharge cycling. In order to reduce the internal pressure of the sealed Ni-MH battery, cyclic voltammetry (CV) were performed on the electrodes of nickel hydroxide(cathode) and hydrogen storage alloy(anode), respectively. The results of the test showed clearly the oxidation/reduction and oxygen evolution reaction in a nickel hydroxide electrode and the hydrogenation behavior of a hydrogen storage electrode. The sealed Ni-MH battery of 130Ah was fabricated by using nickel hydroxide of a high over-voltage for an oxygen gas evolution and hydrogen storage alloy of a good performance for activation The battery showed a good characteristics such as a high charge efficiency of 98% at 1 C charge current, a low level internal pressure of 4 atm on a continuous over-charging and a large preservation capacity of 95% at 400 cycle.

Analysis of Hydrogen Sales Volume in Changwon (창원 수소충전소의 수소판매량 분석)

  • KANG, BOO MIN;KANG, YOUNG TAEC;LEE, SANG HYUN;KIM, NAM SEOK;YI, KYEONG EUN;PARK, MIN-JU;JEONG, CHANG-HOON;JEONG, DAE-WOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.4
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    • pp.356-361
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    • 2019
  • Since the government announced the roadmap to revitalize the hydrogen economy, we are constantly making the effort to expand the use of fuel cell electric vehicles (FCEV) and hydrogen charging stations. There is however a significant issue to build and operate the hydrogen charging station due to the lack of the profit model. Many researchers believe that the supply of FCEV will be increased in the near future and finally ensure the economy of hydrogen charging stations. This study shows that the sales changes of hydrogen gas and consumption patterns by the operation of the hydrogen charging station in Changwon City. The results will be used as the evidence to support for operating the hydrogen charging station by private businesses and the validity of additional establishment of hydrogen charging stations.

Current Status of Hydrogen Consumption and Promotion Plan for the Deployment of Fuel Cell Bus in Changwon City (창원시 수소버스 운행에 따른 수소소비 현황 및 보급 활성화 방안)

  • KANG, BOO MIN;KANG, YOUNG TAEC;KIM, MIN WOO;LEE, SANG HYUN;PARK, MIN-JU;JEONG, CHANG-HOON;JEONG, DAE-WOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.6
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    • pp.479-484
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    • 2019
  • Environmental problems were related to human life from second industrial revolution. Recently, peoples are interested in solving global warming problem and improving air quality. Therefore, we request for eco-friendly vehicles such as fuel cell electric vehicles using eco-friendly hydrogen energy. In order to reduce particulate matter in Korea, we have established a plan to promote the deployment of eco-friendly vehicles. In this paper, we analyzed the average monthly charging status and hydrogen consumption by introducing fuel cell bus.