• Title/Summary/Keyword: Hydrogen charging system

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Application of Nondestructive Technique on Hydrogen Charging Times of Stainless Steel 304L (스테인리스 304L강의 수소장입시간에 대한 비파괴기법 적용)

  • Lee, Jin-Kyung;Hwang, Seung-Kuk;Lee, Sang-Pill;Bae, Dong-Su;Son, Young-Seok
    • Journal of Power System Engineering
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    • v.19 no.5
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    • pp.60-66
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    • 2015
  • Embrittlement of material by hydrogen charging should be cleared for safety of storage vessel of hydrogen and components deal with hydrogen. A stainless steel is generally used as materials for hydrogen transportation and storage, and it has a big advantage of corrosion resistance due to nickel component in material. In this study, microscopic damage behavior of stainless steel according to the hydrogen charging time using nondestructive evaluation was studied. The surface of stainless steel became more brittle as the hydrogen charging time increased. The parameters of nondestructive evaluation were also changed with the embrittlement of stainless steel surface by hydrogen charging. Ultrasonic test, which is the most generalized nondestructive technique, was applied to evaluate the relationship between the ultrasonic wave and mechanical properties of stainless steel by hydrogen charging. The attenuation coefficient of ultrasonic wave was increased with hydrogen charging time because of surface embrittlement of stainless steel. In addition, acoustic emission test was also used to study the dynamic behavior of stainless steel experienced hydrogen charging. AE event at the hydrogen charged specimen was obviously decreased at the plastic zone of stress-strain curves, while the number of event for the specimen of hydrogen free was dramatically generated when compared with the specimens underwent hydrogen charging.

Effect of Hydrogen Charging on the Mechanical Properties of 304 Stainless Steels

  • Lee, Sang-Pill;Hwang, Seung-Kuk;Lee, Jin-Kyung;Son, In-Soo;Bae, Dong-Su
    • Journal of Power System Engineering
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    • v.19 no.5
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    • pp.73-79
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    • 2015
  • The effects of hydrogen charging on the mechanical properties of 304 stainless steels were investigated in conjunction with the detailed examinations of their fracture modes. The dependence of the absorbed impact energy and the surface hardness of the 304 stainless steels on the hydrogen charging time was characterized. The tensile properties of the 304 stainless steels by the variation of cross-head speed were also evaluated at the room temperature. The hydrogen charging was performed by an electrolysis method for all specimens of the 304 stainless steels. The mechanical properties of the 304 stainless steels exhibited the sensitivity of embrittlement due to a hydrogen charging. The correlation between mechanical properties and fracture surfaces was discussed.

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.

A Study on the Priority of Site Selection for Hydrogen Vehicle Charging Facilities in Seoul Using a Market Demand Prediction Model (시장수요예측 모델을 활용한 서울시 수소차 충전시설의 입지선정 우선순위에 관한 연구)

  • Jin Sick, Kim;Kook Jin, Jang;Joo Yeoun, Lee;Myoung Sug, Jung
    • Journal of the Korean Society of Systems Engineering
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    • v.18 no.2
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    • pp.140-148
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    • 2022
  • Hydrogen is expected to be widely applied in most sectors within the current energy system, such as transportation and logistics, and is expected to be economically and technologically utilized as a power source to achieve vehiclebon emission reduction. In particular, the construction of hydrogen charging station infrastructure will not only support the distribution of hydrogen electric vehicles, but also play an important role in building a hydrogen logistics system. Therefore, This paper suggest additional charging infrastructure areas in Seoul with a focus on supply according to the annual average growth rate (CAGR), centering on Seoul, where hydrogen vehicles are most widely distributed. As of February 2022, hydrogen charging infrastructures were installed in Gangseo-gu, Gangdong-gu, Mapo-gu, Jung-gu, and Seocho-gu in downtown Seoul. Next, looking at the number of hydrogen vehicles by administrative dong in Seoul from 2018 to 2022, Seocho-gu has the most with 246 as of 2022, and Dongjak-gu has the highest average growth rate of 215.4% with a CAGR of 215.4%. Therefore, as a result of CAGR analysis, Dongjak-gu is expected to supply the most hydrogen vehicles in the future, and Seocho-gu currently has the most hydrogen vehicles, so it is likely that additional hydrogen charging infrastructure will be needed between Dongjak-gu and Seocho-gu.

Evaluation of Hydrogen Embrittlement Behavior in INCONEL Alloy 617 by Small Punch Test (소형펀치 시험법을 이용한 INCONEL Alloy 617의 수소취화거동 평가)

  • Seo, Hyon-Uk;Ma, Young-Hwa;Yoon, Kee-Bong
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.4
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    • pp.340-345
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    • 2010
  • For the conversion into hydrogen society, not only studying facilities of hydrogen production, storage, transportation and charging system but also developing technique of ensuring safety are essentially needed. Hence, for the first step of that, evaluated the hydrogen embrittlement of Inconel alloy 617, Ni-based super heat-resisting alloy, by small punch test. Prepared the various specimens through changing electrochemical charging time and measured the toughness degradation of the specimens by small-punch test. The analysis of hydrogen embrittlement behavior were carried out by investigating the fractured surface of specimens. This study has significance on revealing mechanism of hydrogen embrittlement behavior and the factor affecting hydrogen embrittlement in the future study.

Bidirectional Power Transmission Fuel Cell System for Notebook Battery (노트북 배터리용 양방향 전력전송 연료전지 시스템)

  • JOUNG, GYUBUM
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.273-278
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    • 2017
  • In this paper, a fuel cell battery charger system, which is capable of bi-directional power transmission without built in battery, has been designed and fabricated. Performance and states of the notebook battery in bi-directional power transmission using the manufactured system have been tested. Before initializing the fuel cell charging system for 1 minute, the system received 10 W of electric power from notebook battery. Then the fuel cell charging system has been normal charging to notebook battery by 50 W. As a result of the experiment, the state of the notebook battery discharged less than 5% at the initial charging time, but then it has been charged. This results proves bi-directional power transmission in notebook computers increase the availability of fuel cell chargers.

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.

Analysis of Flow Performance According to Actuator Geometry of Receptacle for Hydrogen Charging System with Filter Applied (필터가 장착된 수소충전시스템용 리셉터클의 작동부 형상에 따른 유동 성능 분석)

  • JU HWAN CHOI; GU HO KIM;JAE KWANG KIM;YONG KI KIM;HYUN KYU SUH
    • Transactions of the Korean hydrogen and new energy society
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    • v.34 no.1
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    • pp.17-25
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    • 2023
  • The purpose of this study was to propose a design that shows optimal performance by changing the geometry of the internal flow path of the receptacle in order to prevent the decrease in flow rate and differential pressure performance due to the application of the receptacle in the hydrogen charging system. To achieve this, 3D computational fluid dynamics simulation was performed for the receptacle, according to the geometry of the flow path inside the receptacle. The pressure results at the inlet and outlet were measured the same as both of N and H2 in the experiment, and the flow rate of H2 was 3.75 times higher than that of N2. In addition, since the flow performance of the receptacle improved under conditions where the flow path was widened, it was confirmed that reducing the diameter of the poppet and the width of the guide are advantageous for improving performance.

A Numerical Analysis of Pressure Distribution and Pressure Drop in Receptacle for Hydrogen Charging System (수소 충전 시스템용 리셉터클의 내부 압력 분포와 압력 강하에 관한 수치적 연구)

  • YUANGANG WANG;SEUNGHYEOK LEE;CHAE HOON SOHN;SEDONG LEE;HYUNBOK LEE
    • Transactions of the Korean hydrogen and new energy society
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    • v.34 no.5
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    • pp.497-504
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    • 2023
  • This study analyzes pressure distribution and pressure drop in the receptacle used in charging system of hydrogen fuel cell vehicles. The objective is to minimize receptacle-induced pressure drop by redesigning internal flow channels. Through numerical simulations, three receptacle variants are compared with a baseline case. Results show reduced pressure drop in the filter section. However, the check valve section exhibits higher pressure drop, requiring further improvement. By increasing throat diameter, pressure drop is decreased by 28% between inlet and outlet of the receptacle. This study shows the relationship between dynamic pressure and pressure drop, providing a guideline for receptacle performance optimization. The redesigned receptacle offers potential for enhancing hydrogen charging efficiency.

Current Status of Standardization for Quality Control of Hydrogen Fuel in Hydrogen Refueling Stations for Fuel Cell Electric Vehicles (수소충전소 내 연료전지용 수소연료 품질 관리 및 표준화 동향)

  • KIM, DONGKYUM;LIM, JEONG SIK;LEE, JEONGSOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.4
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    • pp.284-292
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    • 2022
  • Hydrogen is promising a candidate for energy supporting the carbon neutrality policy for greenhouse gas reduction, which is being promoted in several countries, including Korea. Although challenging efforts-such as lowering the costs of green hydrogen production and fuel cells-remain, hydrogen fuel cell electric vehicles (FCEVs) are expected to play a significant role in the energy transition from fossil fuels to renewable energy. In line with this objective, the hydrogen FCEV working group in the International Organization for Standardization (ISO) compiled and revised international standards related to hydrogen refueling stations as of 2019. A well-established hydrogen quality management system based on the standard documents will increase the reliability of hydrogen charging stations and accelerate the use of FCEVs. In this study, among the published ISO standards and other references, the main requirements for managing charging stations and developing related techniques were summarized and explained. To respond preemptively to the growing FCEV market, a continuous hydrogen quality monitoring method suitable for use at hydrogen charging stations was proposed.