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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean hydrogen and new energy society
Journal Basic Information
Journal DOI :
The Korean Hydrogen and New Energy Society
Editor in Chief :
Volume & Issues
Volume 25, Issue 6 - Dec 2014
Volume 25, Issue 5 - Oct 2014
Volume 25, Issue 4 - Aug 2014
Volume 25, Issue 3 - Jun 2014
Volume 25, Issue 2 - Apr 2014
Volume 25, Issue 1 - Feb 2014
Selecting the target year
Research of Characterization of Covalently Cross-linked SPEEK/Cs-Substituted MoPA/Ceria 1wt% Composite Membrane for Water Electrolysis
Park, Daeyoung ; Hwang, Sungha ; Oh, Seunghee ; Yoon, Daejin ; Kang, Ansoo ; Moon, Sangbong ; Chung, Janghoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 1~10
DOI : 10.7316/KHNES.2014.25.1.001
) was used to scavenge free radicals which attack the membrane in the polymer electrolyte membrane water electrolysis (PEMWE) circumstance and to increase the duration of the membrane. In order to improve the electrochemical, mechanical and electrocatalytic characteristics, engineering plastic of the sulfonated polyether ether ketone (SPEEK) as polymer matrix was prepared in the sulfonation reaction of polyether ether ketone (PEEK) and the organic-inorganic blended composite membranes were prepared by sol-gel casting method with loading the highly dispersed ceria and cesium-substituted phophomolybdic acid(Cs-MoPA) with cross-linking agent contents of 0.01mL. In conclusion, CL-SPEEK/
-MoPA/ceria(1%) membrane showed the optimum results such as 0.1095S/cm of proton conductivity at
, 2.906meq./g-dry-membrane of ion exchange capacity and mechanical characteristics, and 49.73MPa of tensile strength which were better than Nafion 117 membrane.
Performance and Microbial Characteristics of Bio-hydrogen Production from Food Waste with Thermal Pre-treatment
Lee, Chaeyoung ; Choi, Jaemin ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 11~18
DOI : 10.7316/KHNES.2014.25.1.011
This study was conducted to investigate the effect of thermal pre-treatment on bio-hydrogen from food waste. Two continuous reactors operated and VFAs(volatile fatty acids) production and microbial communities were analyzed. The average hydrogen yield was 0.50 and 0.33mol
in thermally treated food added reactor(R1) and control(R2), respectively. Butyrate concentration was similarly 7,500mg/L in both reactors, but two times higher lactate concentration was observed in R2(3,800mg/L). The results of FISH(fluorescence in situ hybridization) showed that the relative microorganism to hydrogen producing bacteria was 78 and 27% in R1 and R2, respectively.
Evaluation of Hydrogen Properties on Mg
-Graphene Composites by Mechanical Alloying
Lee, Young-Sang ; Lee, Soo-Sun ; Lee, Byung-Ha ; Jung, Seok ; Hong, Tae-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 19~27
DOI : 10.7316/KHNES.2014.25.1.019
Mg hydride has a high hydrogen capacity (7.6%), at high temperature, and is a lightweight and low cost material, thus it a promising hydrogen storage material. However, its high operation temperature and very slow reaction kinetics are obstacles to practical application. In order to overcome these disadvantages of Mg hydride, graphene powder was added to it. The addition of graphene has been shown to reduce the operating temperature of dehydrogenation. Moreover, in this report the environmental aspects of
-Graphene composites are investigated by means of the environmental life cycle assessment (LCA) method.
-Graphene mixture was prepared by hydrogen induced mechanical alloy (HIMA). The synthesized powder was characterized by XRD(X-ray Diffraction). The hydrogenation behaviors were evaluated by using a Sievert's type automatic PCT apparatus. Such evaluation of Materials also conducted in the LCA. From the result of P-C-T(Pressure-Composition-Temperature) curves, the
-3wt.% graphene composite was evaluated as having a 5.86wt.% maximum hydrogen storage capacity, at 523K. From absorption kinetic testing, the
-7wt.% graphene composite was evaluated as having a maximum 6.94wt.%/ms hydrogen absorption rate, at 573K. Environment evaluation results for the
-graphene composites and other materials indicated environmental impact from the electric power used and from the materials themselves.
Performance of Modified-Silicon Carbide Fiber Composites Membrane for Polymer Exchange Membrane Fuel Cells
Park, Jeong Ho ; Kim, Taeeon ; Juon, Some ; Cho, Yongil ; Cho, Kwangyeon ; Shul, Yonggun ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 28~38
DOI : 10.7316/KHNES.2014.25.1.028
The organic-inorganic composite membrane in polymer exchange membrane fuel cells (PEMFCs) have several fascinating technological advantages such as a proton conductivity, thermal stability and mechanical properties. As the inorganic filler, silicon carbide (SiC) fiber have been used in various fields due to its unique properties such as thermal stability, conductivity, and tensile strength. In this study, composite membrane was successfully fabricated by modified-silicon carbide fiber. Modified process, as a novel process in SiC, takes reaction by phosphoric acid after oxidation process (generated homogeniusly
layer on SiC fiber). The mechanical property which was conducted by tensile test of the 5wt% modified-
composite membrane was better than that of Aquivion casting membrane as well as ion cxchange capacity(IEC) and proton conductivity. In addition, the single cell performance was observed that the 5wt% modified-
composite membrane was approximately
higher than that of a Aquivion casting electrolyte membrane and electrochemical impedance was improved with the charge transfer resistance and membrane resistance.
Heat Exchanger Design For The Individually Allocated Fuel Cell For 1kw Power generation
Lee, Taeck Hong ; Park, Tae Seong ; Kim, Tae Wan ; Noh, Jae Hyun ; Kang, Young Jin ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 39~46
DOI : 10.7316/KHNES.2014.25.1.039
Our lab designs a heat exchangers for hydrogen gas. Coolant is water, thus it is very difficult to determine heat transfer parameters in this gas-liquid system. Repeated experiments gives overdesign value 6.06%, overall heat transfer coefficient 36.32 (
) for Hydrogen. Theoretically determined overall heat transfer coefficient is 38.44 (
). Our lab simulated this system and overdesign 30.4% shows good match with this experiment by HTRI. These parameters are in same range with literature.
A Study on Combustion and Heat Transfer in Premixed Impinging Flames of Syngas(H
/CO)/Air Part I: Characteristics of Combustion
Jeong, Byeonggyu ; Lee, Yongho ; Lee, Keeman ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 47~58
DOI : 10.7316/KHNES.2014.25.1.047
The characteristics of flame shape, laminar burning velocity, emissions and heat flux of stagnation point in premixed impinging jet flame of syngas fuel with 10% hydrogen content were experimentally investigated. Also, the adiabatic temperature and burning velocity are calculated by Chemkin package with USC-II mechanism. The equivalence ratios(0.8~5.0) and dimensionless separation distance(2.0~5.0) with fixed Reynolds number(1800) are main parameters in this work. Different flame shapes and colors were observed for different impingement conditions. The experimental results of burning velocity by flame surface area have a consistent with previous works and numerical simulation of this work. The inner flame length could be predicted with the ratio of mixture velocity and burning velocity from a simple formulation by the laminar burning velocity definition. It has been observed that the heat fluxes at stagnation point are directly affected by the flame shape including the separation distance. The emission results in impinging flame of syngas fuel show that the characteristics of
emission traced well with adiabatic temperature trend and CO emission due to fuel rich condition increased continuously with respect to the equivalence ratio.
A Study on Combustion and Heat Transfer in Premixed Impinging Flames of Syngas(H
/CO)/Air Part II: Heat Transfer Characteristics
Sim, Keunseon ; Jeong, Byeonggyu ; Lee, Yongho ; Lee, Keeman ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 59~71
DOI : 10.7316/KHNES.2014.25.1.059
An experimental study has been conducted to investigate the heat transfer characteristics of laminar syngas/air mixture with 10% hydrogen content impinging normally to a flat plate of cylinder. Effects of impinging distance, Reynolds number and equivalence ratio as major parameters on heat fluxes of stagnation point and radial direction were examined experimentally by the direct photos and data acquisitions from heat flux sensor. In this work, we could find the incurved flame behavior of line shaped inner top-flame in very closed distance between flat plate and burner exit, which has been not reported from general gas-fuels. There were 3 times of maximum and 2 times minimum heat flux of stagnation point with respect to the impinging distance for the investigation of Reynolds number and equivalence ratio effect. It was confirmed that the maximum heat flux of stagnation point in 1'st and 2'nd peaks increased with the increase of the Reynolds number due to the Nusselt number increment. There was a third maximum rise in the heat flux of stagnation point for larger separation distances and this phenomenon was different each for laminar and turbulent condition. The heat transfer characteristics between the stagnation and wall jet region in radial heat flux profiles was investigated by the averaged heat flux value. It has been observed that the values of averaged heat flux traced well with the characteristics of major parameters and the decreasing of averaged heat flux was coincided with the decreasing trend of adiabatic temperature in spite of the same flow condition, especially for impinging distance and equivalence ratio effects.
Water Vapor Supply Study for Air and Carbon dioxide
Lee, Taeck Hong ; Park, Tae Seong ; Kim, Tae Wan ; Noh, Jae Hyun ; Kang, Young Jin ; Lee, Seung Yong ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 72~78
DOI : 10.7316/KHNES.2014.25.1.072
The study has been designed to develop water vapor supply for semiconductor industry, industrial gas manufacturing, impurities analysis, and fuel cell. Water concentration in air reached
at dew temp (
) and water concentration in CO2 reached
at dew temp (
. Carbon dioxide needs more wet gas than air because interaction potential of carbon dioxide shows more strong attraction than air.
A Computational Study on DME HCCI Combustions Characteristics with Methanol Concentrations
Lee, Hyowon ; Lim, Ocktaeck ; Park, Kyuyeol ; Cho, Wonjun ; Baek, Youngsoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 79~86
DOI : 10.7316/KHNES.2014.25.1.079
In Dimethyl Ether (DME) indirect production processes, DME have a reforming process to separate Methanol. DME has a high cetane number and Methanol has a high octane number. Each fuel has a different combustion characteristics and reactivity. So, this paper was investigated on the combustion characterisitics of DME and Methanol. Basically, Methanol has a effect of retarding ignition. However, Within 10% of total carbon mole number in DME, Methanol slightly changed the onset timing of Low Temperature Reaction (LTR) with increasing thermal-ignition preparation range. It means that controlling combustion phasing of DME can be possible without eliminated LTR. In case of IMEP, the ranges.
Direct Combustion Characteristics of Coal by Oxygen Carrier
Ryu, Hojung ; Lee, Chungwon ; Lee, Dongho ; Bae, Dalhee ; Lee, Suengyong ; Park, Yeongseong ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 87~96
DOI : 10.7316/KHNES.2014.25.1.087
Direct combustion characteristics of coal and oxygen carrier were measured in the thermogravimetric analyzer using four coals and two different oxygen carriers. The direct combustion efficiency decreased in order of Roto, Kideco, Sunhwa and Hyper coal for both oxygen carriers. Moreover, OCN703-1100 oxygen carrier showed better combustion efficiency than OCN706-1100 oxygen carrier for all four coals. The reduction characteristics of two oxygen carriers for
, CO and
gases were measured in the thermogravimetric analyzer to investigate why OCN703-1100 oxygen carrier showed better combustion efficiency than OCN706-1100 for all coals. The OCN703-1100 oxygen carrier represented higher reduction rate than OCN706-1100 for all reducing gases. Moreover, the total pore area and the porosity of OCN703-1100 were higher than those of OCN706-1100 oxygen carrier. The total volatile gas and volatile components of four coals were measured in a batch type fluidized bed reactor to investigate why the direct combustion efficiency decreased in order of Roto, Kideco, Sunhwa and Hyper coal for both oxygen carriers. The direct combustion efficiency was proportional to the total amount of (
) produced during devolatilization of coals.
Effect of Operating Pressure on the Heat Transfer and Particle Flow Characteristics in the Syngas Quench System of an IGCC Process
Park, Sangbin ; Yang, Joohyang ; Oh, Junho ; Ye, In-Soo ; Ryu, Changkook ; Park, Sung Ku ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 1, 2014, Pages 97~104
DOI : 10.7316/KHNES.2014.25.1.097
In a coal gasifier for IGCC, hot syngas leaving the gasifier at about 1550oC is rapidly quenched by cold syngas recycled from the gas cleaning process. This study investigated the flow and heat transfer characteristics in the gas quench system of a commercial IGCC process plant under different operating pressures. As the operating pressure increased from 30 bar to 50 bar, the reduced gas velocity shortened the hot syngas core. The hot fly slag particles were retained within the core more effectively, and the heat transfer became more intensive around the hot gas core under higher pressures. Despite the high particle concentrations, the wall erosion by particle impaction was estimated not significant. However, large particles became more stagnant in the transfer duct due to the reduced gas velocity and drag force under higher pressures.