• 제목/요약/키워드: Hydrogen pressure control

검색결과 97건 처리시간 0.03초

국내 수소타운 내 0.1MPa 이하 저압 수소 사용시설의 안전관리 항목 분석 (An Analysis of Safety Management Items for Low Pressure Hydrogen Facility below 0.1MPa in Domestic Hydrogen Town)

  • 이덕권;허두현;이선규;이정운;유근준;이연재;김희식
    • 한국가스학회지
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    • 제19권6호
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    • pp.85-91
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    • 2015
  • 전 세계적으로 수소에너지에 대한 관심이 점차 증가함에 따라 수소 생산, 저장, 운송, 이용 분야에서 응용 기술의 개발이 활발히 진행되고 있다. 국내에서도 울산 수소타운을 조성하여 시범운영 중에 있어 수소에너지 응용처 확대에 대한 가능성을 높이고 있다. 울산 수소타운은 가스 사용 압력에 따라 고압부와 저압부로 구분할 수 있는데 고압부는 '고압가스안전관리법'을 적용하여 안전관리를 하고 있고 저압부는 '수소타운 시범사업의 안전관리에 관한 지침'을 적용하여 운영 중에 있다. 본 논문에서는 울산 수소타운 내 0.1MPa 이하 저압 수소 사용시설의 안전관리 효율성 향상을 위해 저압 수소사용 시설 및 안전관리 항목 분석을 통해 안전관리 방향성을 검토하고 향후 개선 방향을 제시하고자 하였다. 본 연구의 결과를 통해 국내 수소타운 활성화 및 안전 관리 효율성 증대에 도움이 될 수 있을 것으로 기대한다.

금속 수소화물을 이용한 수소공급시스템 (Hydrogen Supplying System using Metal Hydride)

  • 배상철;승전정문
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 춘계학술대회
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    • pp.13-19
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    • 2007
  • To find out the optimum design of hydrogen storage and supply tank using Metal Hydride (briefly MH) and to make clear the performance characteristics under various conditions are our research purpose. In order to use the low-temperature exhaust heat, $LaNi_{4.7}Al_{0.3}$ which operates under the low pressure of 1 MPa is chosen, and we measure the basic properties, namely density, specific heat, PCT(Pressure-Concentration-Temperature) characteristics, and effective thermal conductivity. Then, a numerical calculation model of hydrogen storage using MH alloy is suggested and this thermal diffusion equation of model is solved by the backward difference method. This calculation results are compared with the experimental results of the systems which installed 1kg MH alloy and, it is found out that our calculation model can well predict the experimental results. By the experimental using MH alloy, it is recognized that the hydrogen flow rate can control by the step adjustment of brine temperature.

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이동식 수소 충전 장비용 수소 밸브의 유체 온도 변화에 따른 유동 특성의 수치해석적 연구 (A Numerical Analysis Study of Hydrogen Valve to Flow Characteristics by Fluid Temperature Variation for Mobile Charging Equipment)

  • 권준영;오승준;최정주;김용기
    • 한국수소및신에너지학회논문집
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    • 제33권6호
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    • pp.769-775
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    • 2022
  • Global efforts to reduce carbon emissions have focused attention on the development of hydrogen energy and the development of various hydrogen mobility requires mobile hydrogen charging stations. In this study, the flow characteristics of the flow control hydrogen valve for mobile hydrogen charging equipment were studied according to the temperature change of hydrogen gas. The inlet pressure was 100 MPa, the outlet pressure to 70 MPa, and temperature condition was set -40℃ to 85℃. As a result, the difference in the valve flow coefficient, which determines the capacity of the valve, showed a difference within 5% depending on the temperature.

디스펜서를 이용한 차량용 연료 탱크 수소 충전 모델링에 관한 연구 (A Study on the Modeling of Fueling Hydrogen Tank in Vehicle Using Dispenser)

  • 최지아;지상원;장지성
    • 드라이브 ㆍ 컨트롤
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    • 제19권2호
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    • pp.36-44
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    • 2022
  • Hydrogen energy as an alternative source of energy has been receiving tremendous support around the world, and research is being actively conducted accordingly. However, most of the studies focus on hydrogen storage tanks and only are few studies on interpreting the hydrogen filling system itself. In this study, with reference to SAE J2601, a hydrogen fueling protocol, a simulation model was developed that can confirm the behavior of the vehicle's internal tank during hydrogen fueling. With respect to factors such as fuel supply temperature, ambient temperature, and pressure increase rate, the developed model can check the change of temperature and pressure in the tank and the state of hydrogen charging during hydrogen fueling. The validity of the developed simulation model was confirmed by comparing the simulation results with the experimental results presented in SAE J2601.

수소저장합금을 이용한 SMH 액추에이터 시스템 개발 (Development of SMH Actuator System Using Hydrogen-Absorbing Alloy)

  • 권대규;홍경주;김경;전원석;방두열;이성철;김남균
    • 제어로봇시스템학회논문지
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    • 제13권11호
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    • pp.1067-1073
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    • 2007
  • This paper presents development of an special metal hydride(SMH) actuator system using a peltier module. The newly developed simple SMH actuator, consisting of the plated hydrogen-absorbing alloy as a power source, Peltier elements as a heat source and a cylinder with metal bellows as a functioning part, has been developed. The SMH actuator is characterized by its small size, low weight, noiseless operation and a compliance similar to that of human body. A new SMH actuator that uses reversible reactions between the heat energy and mechanical energy of a hydrogen absorbing alloy. It is well known that hydrogen-absorbing alloys can reversibly absorb and desorb a large amount of hydrogen, more than about 1000 times of their own volume. To improve the thermal conductivity of the hydrogen-absorbing alloy, an electro-less copper plating has been carried out. For this purpose, the effects of the electro-less copper plating and the dynamic characteristics of the SMH actuator have been studied. The hydrogen equilibrium pressure increases and hydrogen is desorbed by heating the hydrogen-absorbing alloys, whereas by cooling the alloys, the hydrogen equilibrium pressure decreases and hydrogen is absorbed. The SMH actuator has the characteristic of being light and easy to use. Therefore, it is suitable for medical and rehabilitation applications.

수소충전소용 유량제어 밸브의 차압에 따른 유동특성에 대한 수치해석적 연구 (A Numerical Study Of Flow Control Valve to Flow Characteristics by Pressure Difference for Hydrogen Station)

  • 남충우;김락민;김현효
    • 한국가스학회지
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    • 제25권2호
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    • pp.28-33
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    • 2021
  • 최근 친환경 자동차에 대한 관심이 높아짐에 따라 공해물질을 배출하지 않는 수소연료전지 차량에 대한 관심과 구매가 증가하고 있다. 최근 정부의 수소에너지 보급정책에 따라 수소충전소의 확충과 핵심부품의 국산화를 지원하고 있다. 본 연구에서는 그중에서도 수소 유량제어 밸브의 차압에 따른 유동특성을 연구하였다. 차압이 높아 짐에 따라 질량유량과 유량계수는 체적유량과 다른 경향을 보임을 확인하였다. 그리고 병목 구간에서의 노즐효과로 인해 수소온도에 영향을 주게되고, 밀도의 변화를 일으켜 질량유량에 영향을 주게 되는 것을 확인 하였다.

발전기 냉각용 On-Site 수소 생산 시스템 적용연구 (Application Study of An On-site Hydrogen Production System for Power Generator Cooling)

  • 문전수;이재근;박필양;박경일
    • 한국수소및신에너지학회논문집
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    • 제20권5호
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    • pp.410-415
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    • 2009
  • A hydrogen cooling method is used in a power generator for removing the unnecessary heat due to the windage loss of a rotor and the joule heat of a stator. A MEA (Membrane Electrolyte Assembly) hydrogen generator has been developed and applied as a hydrogen supplying system for the cooling of a 350MW power generator. As a field application result, the average potential of eleven cells and the voltage efficiency were measured 2.26V/cell and 65.4% (Higher Heating Value) respectively at the hydrogen pressure of 6 Bar, the hydrogen flow rate of 9.1L/min, and the current of 150A.

Basic Design of Hydrogen Liquefier Precooled by Cryogenic Refrigerator

  • Kim, Seung-Hyun;Chang, Ho-Myung;Kang, Byung-Ha
    • International Journal of Air-Conditioning and Refrigeration
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    • 제6권
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    • pp.124-135
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    • 1998
  • A thermodynamic cycle analysis is performed for refrigerator-precooled Linde-Hampson hydrogen liquefiers, including catalysts for the ortho-to-para conversion. Three different configurations of the liquefying system, depending upon the method of the o-p conversion, are selected for the analysis. After some simplifying and justifiable assumptions are made, a general analysis program to predict the liquid yield and the figure of merit (FOM) is developed with incorporating the commercial computer code for the thermodynamic properties of hydrogen. The discussion is focused on the effect of the two primary design parameters - the precooling temperature and the high pressure of the cycle. When the precooling temperature is in a range between 45 and 60 K, the optimal high pressure for the maximal liquid yield is found to be about 100 to 140 bar, regardless of the ortho-to-para conversion. However, the FOM can be maximized at slightly lower high pressures, 75 to 130 bar. It is concluded that the good performance of the precooling refrigerator is significant in the liquefiers, because at low precooling temperatures high values of the liquid yield and the FOM can be achieved without compression of gas to a very high pressure.

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유한요소법을 이용한 FCEV용 체크밸브의 열간 단조 공정 해석 (Analysis of Hot Forging Process of Check Valve in FCEV using Finite Element Method)

  • 정동환;송현정;이창훈;이승범;김지훈;손근주;조해용
    • 한국기계가공학회지
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    • 제20권11호
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    • pp.100-107
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    • 2021
  • The use of new and renewable energy is essential to solve the problem of increasing fossil fuel use due to industrial development. The paradigm of the automobile industry has changed due to the strengthening of environmental regulations in developed countries, and the development of eco-friendly cars is underway. Fuel cell electric vehicles (FCEVs), which use hydrogen as fuel, require strict standards for fuel-related components. In particular, check valves for FCEV control high-pressure hydrogen and thus, must be sufficiently strong for the challenging environment caused by high-pressure hydrogen. Therefore, this study used DEFORM 3D, a regular finite element analysis program, to check the moldability of check valves for FCEV, design the process, verify reliability through single streamline analysis, tensile tests, and ANSYS simulations, and identify suitable materials for the high-pressure hydrogen environment.

Nafion 115를 사용한 DMFC MEA 의 성능실험 (Performance of a direct methanol fuel cell (DMFCs)Using Nation 115)

  • 최훈;황용신;차석원
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 추계학술대회 논문집
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    • pp.43-46
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    • 2007
  • To find out the optimum design of hydrogen storage and supply tank using Metal Hydride (briefly MH) and to make clear the performance characteristics under various conditions are our research purpose. In order to use the low-temperature exhaust heat, $LaNi_{4.7}Al_{0.3}$ which operates under the low pressure of 1MPa is chosen, and we measure the basic properties, namely density, specific heat, PCT(Pressure-Concentration-Temperature) characteristic, and effective thermal conductivity. Then, a numerical calculation model of hydrogen storage using MH alloy is suggested and this thermal diffusion equation of model is solved by the backward difference method. This calculation results rate compared with the experimental results of the systems which installed 1kg MH alloy and, it is found out that our calculation model can well predict the experimental results. By the experimental using MH alloy, it is recognized that the hydrogen flow rate can control by the step adjustment of brine temperature.

  • PDF