• Title/Summary/Keyword: 수소 누출

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Characteristics of methane and propane leaking gas images (methane과 propane의 누출 Optical Gas Image의 특성연구)

  • Park, Suri;Han, Sang-wook;Kim, Byung-jick
    • Journal of the Korean Institute of Gas
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    • v.23 no.4
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    • pp.28-39
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    • 2019
  • In this paper is image characteristics of main gas can be a basic data for the identification of the type of leaking gas and the estimation of the emission quantity in OGI(Optical Gas Image) technology. The purpose of this research is to observe the differences of leaking gas images of the two important hydrocarbons of methane and propane in the industry. We fabricated a wind shield of quartz-based with infrared-permeable properties was prepared and methane and propane were simultaneous emission and then photographed with an infrared OGI camera and we are analyzed it. We have a stable image with windbreak of quartz-based minimizes the effect of wind. As a result of analyzing the image of two hydrocarbons with a leakage gas reference value of 1 L/min, an easily recognizable distances by OGI camera were 6 m for methane and 9 m for propane. In the distances range of 1 to 10 m between the infrared camera and the leaking gas point, the gas plume size of the propane gas was larger and clear than that of the methane gas plume. Compared with the number of points in the image, propane was 3.8 times more than methane.

Comparative Analysis of IEC Standard and Simulation Results for Hydrogen Hazardous Distance (수소 폭발위험범위에 대한 IEC기준과 시뮬레이션 결과의 비교분석)

  • Seung-Hyo An;Eun-Hee Kim;Seon-Hee Lee;Byung-Chol Ma
    • Journal of the Korean Institute of Gas
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    • v.28 no.1
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    • pp.19-26
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    • 2024
  • In workplaces handling flammable gas such as hydrogen, hazardous area is determined through KS C IEC 60079-10-1 standard. Because this standard determines the hazardous distance based on the release characteristic regardless of the type of gas, indoor/outdoor conditions, and atmospheric conditions, concerns are being raised about the effectiveness. In this study, simulations (PHAST, HyRAM) were performed to calculate the hazardous distance for hydrogen under various release characteristics and atmospheric conditions, and compared these results to IEC standard log-log graph. Also, we performed regression analysis according to each result. we found that the simulation results were 0.6 to 3.8 times less than the IEC standard, presented convenient linear regression equations. In addition, We confirmed that the results of hazardous distance varied based on wind velocity and atmospheric stability at the same release characteristic. In addition, we derived linear regression equations for release characteristics and hazardous distance that can be conveniently utilized. So, when classifying hazardous area in workplaces where they handle the hydrogen, the integrated graph and linear regression equation are helpful for confirming the hazardous area. Moreover, it is expected that the economic burden will be minimized by being able to classify reasonable hazardous area and to greatly reduce the risk of hydrogen explosion.

An Experimental Study on the Sensor Response at Hydrogen Leakage in a Residential Fuel Cell System (가정용 연료전지 시스템 내부 수소 누출 시 센서 응답 특성에 관한 연구)

  • Kim, Young-Doo;Shin, Dong-Hoon;Chung, Tae-Yong;Nam, Jin-Hyun;Kim, Young-Gyu;Lee, Jung-Woon
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.5
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    • pp.378-383
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    • 2009
  • Hydrogen is the primary fuel in fuel cell systems. Because of high inflammation and explosion possibility of hydrogen, fuel cell systems require safety measures to prevent hydrogen hazard upon leakage. In this study, a model enclosure was made by referring to a commercial residential fuel cell system and hydrogen leakage experiments and computational simulations were conducted therein. Hydrogen was injected into the cavity through leakage holes located at the bottom while its flow rate was precisely controlled using MFC. The transient sensor signals from hydrogen sensors installed inside the enclosure were recorded and analyzed. The hydrogen sensor signals showed different delay times depending on their position relative to a leakage point, which indicated that hydrogen generally moves upward and accumulates at the upper region of a closed cavity. The inflammable regions with hydrogen concentration over 4% LEL were observed to locate near the leakage hole initially, and broaden towards the upper cavity region afterward. The simulation result showed that detection time at the hydrogen sensor was similar to the pattern of experimental results. However, the maximum concentration of hydrogen had a gap between experiment and simulation at detect point due to measurement errors and reaction rate.

A Study on the Dispersion of Hydrogen Gas in Atmosphere (대기 중 수소가스의 확산거동에 관한 연구)

  • Ahn Bum Jong;Jo Young-Do
    • Journal of the Korean Institute of Gas
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    • v.9 no.1 s.26
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    • pp.9-15
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    • 2005
  • Hydrogen is considered to be the most important future energy carrier in many applications reducing significantly greenhouse gas emissions, but the safety issues associated with hydrogen applications need to be investigated and fully understood to be applicable as the carrier. Therefore, there is a considerable demand for further research concerning the dispersion of hydrogen/air mixture clouds and the possible consequences of their ignition. In this study, the dispersion of hydrogen gas in atmosphere has been analysed with atmospheric condition by concerning the buoyancy of hydrogen. The hazard ranges to wind direction increase with wind speed and the stability of atmosphere. The concentration of hydrogen at just above ground is nearly zero due to buoyancy of hydrogen gas. Therefore, the ignition probability of hydrogen gas cloud is low and the hazard of explosion or fire associated with hydrogen gas is relatively low comparing with the other fuel gas such as propane or butane.

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Non-aqueous Zinc(Zn) Plating to Prevent Hydrogen Release from Test Specimens in Hydrogen Embrittlement Test (수소 취성 시험 평가를 위한 수소 방출 방지용 비수계 아연(Zn) 도금)

  • Jeon, Jun-Hyuck;Jang, JongKwan
    • Journal of the Korean Institute of Gas
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    • v.26 no.3
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    • pp.21-26
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    • 2022
  • Zinc is emerging as a environment-friendly plating material to replace cadmium, which is harmful to the human body, to prevent hydrogen gas penetration or release from metal materials. Electroplating of Zn and Zn alloys, which is usually performed in an aqueous acidic atmosphere, has disadvantages such as low coulombic efficiency, corrosion, and hydrogen release, resulting in industrial use difficult. In this study, a deep-eutectic solvent was synthesized using choline chloride and ethylene glycol. Using this as a solvent, an electrolyte for Zn plating was prepared, and then zinc was plated on the STS 304 substrate. The surface microstructure and roughness were observed using SEM and AFM. The crystal structure of the electro-plated film was analyzed using XRD. Finally, the preventing effects of hydrogen release through Zn-based deep-eutectic plating on the STS 304 substrate were compared with the uncoated substrate.

Second-Order Perturbation Solutions of Liquid Pool Spreading with Instantaneous Spill (순간 누출된 액체의 확산에 관한 2차 섭동 해)

  • Kim, Myung-Bae;Do, Kyu-Hyung;Han, Yong-Shik;Choi, Byung-Il
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.6
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    • pp.513-518
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    • 2010
  • In the present work the second-order perturbation solutions of the simple physical model for liquid pool spreading is obtained for the case of instantaneous spill. To generalize the solution governing equations are non-dimensionalized, and two dimensionless parameters, dimensionless evaporation rate and aspect ratio of the initial pool, are identified to control the governing equations. The dimensional governing equations have three parameters. The second-order solution improves fairly the first-order solution for the pool volume.

Analysis of Density Distribution for Hydrogen Flow Using Three-dimensional Digital Speckle Tomography (3차원 디지털 스페클 토모그래피를 이용한 수소 유동의 밀도 분포 분석)

  • Ahn, S.S.;Ko, H.S.
    • Transactions of the Korean hydrogen and new energy society
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    • v.16 no.3
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    • pp.253-261
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    • 2005
  • 석유 연료 고갈 해결 및 온실 효과 가스 배풀 저감을 위한 방안으로 제시되는 수소는 다양한 에너지 저장체로 사용되어 질 수 있으나 안전성에 대한 연구가 요구되어진다. 따라서, 일반적인 저장 형태인 고압 저장 탱크에서 누출이 되었을 경우 분사되는 수소의 거동에 대한 연구가 이루어져야하며 이를 바탕으로 한 보완책이 제시되어야 한다. 이번 연구에서는 누설 시 확산되는 수소의 밀도를 실제 거동과 유사한 3차원 컴퓨터 영상장으로 합성한 후 ART(algebraic reconstruction technique) 및 MART(multiplicative ART)를 기반으로 한 3차원 디지털 스페클 토모그래피 기법을 개발하여 재건하고 분석하였다.

A Numerical Analysis of Hydrogen Diffusion for Hydrogen Leakage from a Fuel Cell Vehicle in a Long Road Tunnel (장대터널에서 수소연료전지 차량의 수소 누출에 대한 수소 거동의 수치해석 연구)

  • Choi, Jongrak;Hur, Nahmkeon;Lee, Moonkyu;Chang, Hyungjin;Lee, Kwangbum;Yong, Geejoong
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.6
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    • pp.588-597
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    • 2012
  • In the present study, the dispersion characteristics of hydrogen leakage from a Fuel Cell Vehicle (FCV) were analyzed by numerical simulation in order to assess the risk of a hydrogen leakage incident in a long road tunnel. In order to implement the worst case of hydrogen leakage, the FCV was located at the center of a tunnel, and hydrogen was completely discharged within 63 seconds. The Leakage velocity of hydrogen was adopted sub-sonic speed because that the assumption of the blockage effect of secondary device inside a vehicle. The temporal and spatial evaluation of the hydrogen concentration as well as the flammable region in a road tunnel was reported according to change of ventilation operating conditions. The hydrogen was blended by supply air form a ventilation fan, however, the hydrogen was discharged to outside in the exhaust air. It is observed that the efficiency way to eliminate of hydrogen is supply air operating condition under the hazardous hydrogen leaking incident. The present numerical analysis can be provided useful information of ventilation under the hydrogen leaking situation.

The Evaluation of Hydrogen Leakage Safety for the High Pressure Hydrogen System of Fuel Cell Vehicle (연료전지자동차의 고압수소저장시스템 수소 누출 안전성 평가)

  • Kim, Hyun-Ki;Choi, Young-Min;Kim, Sang-Hyun;Shim, Ji-Hyun;Hwang, In-Chul
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.4
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    • pp.316-322
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    • 2012
  • A fuel cell vehicle has the hydrogen detection sensors for checking the hydrogen leakage because it use hydrogen for its fuel and can't use a odorant to protect the fuel cell stack. To verify the hydrogen safety of leakage we select the high possible leak points of fittings in hydrogen storage system and test the leaking behavior at them. The hydrogen leakage flow rate is 10, 40, 118 NL/min and the criterion for maximum hydrogen leakage is based on allowing an equivalent release of combustion energy as permitted by gasoline vehicles in FMVSS301. There are total 18EA hydrogen leakage detection sensors installed in test system. we acquire the hydrogen leakage detection time and determine the ranking. Hydrogen leakage detection time decrease when hydrogen leakage flow rate increase. The minimum hydrogen leakage detection time is about 3 seconds when the flow rate is 118NL/min. In this study, we optimize hydrogen sensor position in fuel cell vehicle and verify the hydrogen leakage safety because there is no inflow inside the vehicle.

Analytical method for combustible waste contaminated by the HF leakage from industrial process (산업공정에서 불산누출로 오염된 가연성 폐기물의 분석방법 연구)

  • Kang, Young-Yeul;Kim, Yong-Jun;Kim, Woo-Il;Yoon, Cheol-Woo;Yeon, Jin-Mo;Shin, Sun-Kyoung;Oh, Gil-Jong
    • Analytical Science and Technology
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    • v.27 no.3
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    • pp.167-171
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    • 2014
  • Hydrofluoric acid (HF), a typical inorganic acid, has been used in the industry for its various usage and classified as the toxic compound, because it can cause the pneumonia and pulmonary edema when it was exposed to respiratory organs. The official environmental analytical method for fluorine and its compound in waste has not been developed. For this reason, we have faced some problem to treat the contaminated wastes by the HF leakage from industrial process. In this study, prepared for analytical method for combustible waste (crop, trees, etc.) generated from HF leaking accident and to be applied as the official analytical method for fluorine contaminated waste when the fluorine and its compound will be regulated as a hazardous material by the waste management law later.