• Title/Summary/Keyword: Green Hydrogen

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An Investigation of Hazard Distance in a Series of Hydrogen Jet Fire with the Hyram Tools (수소 누출 시 제트화재 피해 범위에 대한 분석)

  • KANG, BYOUNG WOO;LEE, TAECK HONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.2
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    • pp.166-173
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    • 2017
  • For commercialization of hydrogen refuelling station (HRS), we need to reduce the clearance distance for jet fire in the real entities in the HRS. Thus, we revisited the current regulations of clearance distance for jet fire in the law. The law in korea has been set up by replica of japan, not by our own scientific basis. Recently, sandia lab developed Hydrogen Risk Assessment Model (HyRAM) tools and we simulated a series of circumstances such as 10 to 850 bar with several leak hole sizes. In 850 bar with 10 mm diameter hole leak cases, it shows $4,981kW/m^2$ at 12 m separation from leak source and $1,774kW/m^2$ at 17 m separation from leak source. In 850 bar with 1 mm diameter leak hole, it shows $0.102kW/m^2$ at 12 m separation and $0.044kW/m^2$ at 17 m separation. Current law may be acceptable with 1 mm hole size with 850 bar.

The Study to Find Causes for Measuring Differences of Hydrogen Fillings in Hydrogen Refueling Station (수소충전소의 연료 계량 방법에 따른 계량 오차가 발생하는 원인 고찰)

  • LEE, TAECK HONG;KANG, BYOUNG WOO;LEE, EUN WOUNG;CHUNG, JIN BAE;HONG, SUK JIN
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.1
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    • pp.32-40
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    • 2018
  • There has been an measuring errors between state of charge (SOC; kg) value and mass flow meter (MFM) value in dispenser for hydrogen refueling station. Finally, we observed average 15.5% weight difference between these two values and the MFM readings show a 15.5% higher readout of the SOC readings. Each car was charged with average 2.66 kg of hydrogen fuel during this period. In the initial charging of the day shows less measuring value than the final charging with the maximum 0.038 kg times number of filling. There is no effects of atmosphere temperature change for the hydrogen filled weight during one full year such as January's cold winters and August's hot summers.

A Study on the Analysis of the Leakage Characteristics and the Selection of Leakage Scenarios of the Blending Hydrogen into Natural Gas Pipeline (수소혼입 천연가스 배관망의 누출 특성 분석 및 누출 시나리오 선정에 관한 연구)

  • Song Su Tak;Ki Seop Lim
    • Journal of the Korean Society of Safety
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    • v.39 no.1
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    • pp.27-32
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    • 2024
  • This study analyzed cases of hydrogen (H2) and natural gas (CH4) leakage from a hydrogen-blended natural gas pipeline to determine a range of leakage characteristics, including leakage type, pipe material, pipe diameter, pressure, and damage size. Based on the results of this analysis, five hydrogen-blended natural gas leakage scenarios were selected. The national vision for a carbon-neutral society by 2050 is a very important strategic objective and promotes environmentally sustainable economic development in the age of the climate crisis. Accordingly, zero-carbon and low-carbon policies are being promoted in various fields, including energy production, consumption, and industrial processes. Hydrogen-blended natural gas is eco-friendly and is considered an important step towards carbon neutrality, with various countries including the United States and several European countries conducting empirical research to further investigate its potential. In Korea, a national research project commenced in April 2023 to verify and demonstrate the life cycle safety of blending hydrogen into the natural gas network. The results of this study will provide important data for the analysis of the damage impacts caused by the leakage of hydrogen-blended natural gas, such as the diffusion of gas clouds, fires, and gas explosions.

Design and Self-sustainable Operation of 1 kW SOFC System (1kW 고체산화물 연료전지(SOFC) 시스템 설계 및 자열운전)

  • Lee, Tae-Hee;Choi, Jin-Hyeok;Park, Tae-Sung;Yoo, Young-Sung;Nam, Suk-Woo
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.5
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    • pp.384-389
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    • 2009
  • KEPRI (Korea Electric Power Research Institute) has studied planar type solid oxide fuel cell (SOFC) stacks using anode-supported cells and kW class co-generation systems for residential power generation. In this work, a 1 kW SOFC system consisted of a hot box part, a cold BOP (balance of plant) part, and a hot water reservoir. The hot box part contained a SOFC stack made up of 48 cells, a fuel reformer, a catalytic combustor, and heat exchangers. Thermal management and insulation system were especially designed for self-sustainable operation in that system. A cold BOP part was composed of blowers, pumps, a water trap, and system control units. When the 1 kW SOFC stack was tested using hydrogen at $750^{\circ}C$, the stack power was about $1.2\;kW_e$ at 30 A and $1.6\;kW_e$ at 50 A. Turning off an electric furnace, the SOFC system was operated using hydrogen and city gas without any external heat source. Under self-sustainable operation conditions, the stack power was about $1.3\;kW_e$ with hydrogen and $1.2\;kW_e$ with city gas respectively. The system also recuperated heat of about $1.1\;kW_{th}$ by making hot water.

Kinetic Parameter Estimation of Ru Catalyst for Steam Methane Reforming (증기 메탄 개질 반응의 Ru 촉매 Kinetic Parameter 예측)

  • JOO, CHONGHYO;KIM, MYUNGJUN;CHO, HYUNGTAE;LEE, JAEWON;KIM, JUNGHWAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.5
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    • pp.499-506
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    • 2022
  • This study proposes kinetic parameters of Ru catalyst for steam methane reforming (SMR). First, extensive experiments are performed under different SMR conditions to evaluate performance of the catalyst in SMR. Second, a kinetic model is designed and developed for parameter estimation and validation using gPROMS. Finally, estimated parameters are fitted to the kinetic model and then, the model results are compared with the experimental data. The model results are in a good agreement with the experimental data.

Performance Research of a Jacket Cooling Water System in a Diesel Electric Generation (디젤발전 자켓냉각시스템 열성능 향상 연구)

  • Lee, Jae-Keun;Moon, Jeon-Soo;Yoon, Seok-Won;Park, Pill-Yang
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.6
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    • pp.534-539
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    • 2009
  • One of the most efficient techniques improving the heat transfer performance of a diesel electric generation is a corrosion control in jacket cooling water system. The environmental parameters most affecting corrosion are dissolved salt concentration, temperature, and pH of cooling water. No corrosion occurs in carbon steel probe at pH 11 in normal operating condition of diesel electric generation cooling water. pH control agent in this study is trisodium phosphate. pH control appears to be the most convenient way to enhance the thermal performance of a diesel electric generation.

The hydrogen storage capacity of metal-containing polyacrylonitrile-based electrospun carbon nanofibers

  • Bai, Byong-Chol;Kim, Jong-Gu;Naik, Mehraj-Ud-Din;Im, Ji-Sun;Lee, Young-Seak
    • Carbon letters
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    • v.12 no.3
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    • pp.171-176
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    • 2011
  • Polyacrylonitrile-based carbon nanofibers (CNFs) containing Ti and Mn were prepared by electrospinning. The effect of metal content on the hydrogen storage capacity of the nanofibers was evaluated. The nanofibers containing Ti and Mn exhibited maximum hydrogen adsorption capacities of 1.6 and 1.1 wt%, respectively, at 303 K and 9 MPa. Toward the development of an improved hydrogen storage system, the optimum conditions for the production of metalized CNFs were investigated by characterizing the specific surface areas, pore volumes, sizes, and shapes of the fibers. According to the results of Brunauer-Emmett-Teller analysis, the activation of the CNFs using potassium hydroxide resulted in a large pore volume and specific surface area in the samples. This is attributable to the optimized pore structure of the metal-containing polyacrylonitrile-based electrospun CNFs, which may provide better sites for hydrogen adsorption than do current adsorbates.

Fabrication and Stability of Pd Coated Ta/YSZ Cermet Membrane for Hydrogen Separation (Pd 코팅된 Ta/YSZ 수소분리막의 제조 및 안정성)

  • Lee, Sang-Jin;Jeon, Sung-Il;Park, Jung-Hoon
    • Membrane Journal
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    • v.20 no.1
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    • pp.69-75
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    • 2010
  • Cermet membrane was fabricated with tantalum as hydrogen-permeable metal and $Y_2O_3$-stabilized $ZrO_2$ (YSZ) as ceramic supporter. Ta/YSZ cermet membrane was prepared through pre-sintering in He atmosphere and then main sintering under high vacuum and the impurities to originate from sintering and brazing could be removed by mechanical polishing. As-prepared membrane showed dense structure with continuous channel of tantalum. Hydrogen permeation experiment was conducted in the region of $200{\sim}350^{\circ}C$ using Ta/YSZ membrane coated with Pd for hydrogen dissociation. The crack in membrane was formed at $300^{\circ}C$ and the Pd coating layer has flaked off in spots. XRD results showed that tantalum reacted with hydrogen to form $Ta_2H$. The lattice expansion by $Ta_2H$ caused deterioration for membrane.

Fabrication and Hydrogen Permeation Properties of $V_{99.8}B_{0.2}$ Alloy Membrane for Hydrogen Separation (수소 분리를 위한 $V_{99.8}B_{0.2}$ 분리막의 제조와 수소투과특성)

  • Jung, Yeong-Min;Jeon, Sung-Il;Park, Jung-Hoon
    • Membrane Journal
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    • v.21 no.4
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    • pp.345-350
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    • 2011
  • No investigation has yet been accomplished to screen the boron-doped effects on vanadium based metal membranes. The synthesis, hydrogen permeation properties and chemical stability of a novel Pd-coated $V_{99.8}B_{0.2}$ alloy membrane are presented in this report. Hydrogen permeation experiments have been performed to investigate the hydrogen transport properties through the Pd-coated $V_{99.8}B_{0.2}$ alloy membrane in the absolute pressure range 1.0~3.0 bar under pure hydrogen, hydrogen-carbon dioxide gas mixture at $400^{\circ}C$. The maximum hydrogen permeation flux was $48.5mL/min/cm^2$ for a 0.5 mm thick membrane under pure hydrogen. This results offer new direction in the synthesis of novel non-Palladium-based metal membranes for hydrogen separation in water-gas shift reaction.

Hydrogen separation of $V_{99.8}B_{0.2}$ Alloy Membrane in Water-gas shift Reaction (수성 가스 전이반응에서 $V_{99.8}B_{0.2}$ 합금 분리막의 수소분리)

  • Jeon, Sung-Il;Jung, Yeong-Min;Park, Jung-Hoon;Lee, Yong-Taek
    • Membrane Journal
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    • v.22 no.1
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    • pp.16-22
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    • 2012
  • The influence of co-existing gases on the hydrogen permeation without sweep gas was studied through a Pd-coated $V_{99.8}B_{0.2}$ alloy membrane. Membranes have been investigated in the pressure range 1.5-8.0 bar under pure hydrogen, hydrogen-carbon dioxide and hydrogen-carbon monoxide gas mixture without sweep gas at $400^{\circ}C$. Preliminary hydrogen permeation experiments without sweep gas have been confirmed that hydrogen flux was $40.7mL/min/cm^2$ for a Pd-coated $V_{99.8}B_{0.2}$ alloy membrane (thick : 0.5 mm) using pure hydrogen as the feed gas. In addition, hydrogen flux was $21.4mL/min/cm^2$ for $V_{99.8}B_{0.2}$ alloy membrane using $H_2/CO_2$ as the feed gas. The hydrogen permeation flux decreased with decrease of hydrogen partial pressure irrespective of pressure when $H_2/CO_2$and $H_2/CO$mixture applied as feed gas respectively and permeation fluxes were satisfied with Sievert's law in different feed conditions. It was found from XRD, SEM/EDX results after permeation test that the Pd-coated $V_{99.8}B_{0.2}$ alloy membrane had good stability and durability for various mixtures feeding condition.