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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 18, Issue 4 - Dec 2007
Volume 18, Issue 3 - Sep 2007
Volume 18, Issue 2 - Jun 2007
Volume 18, Issue 1 - Mar 2007
Selecting the target year
Process Design and Selection of Operating Conditions for SMART System
Ryu, Ho-Jung ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 1~11
To check feasibility of SMART(Steam Methane Advanced Reforming Technology) system, conceptual design and sensitivity analysis of operating variables have been performed based on the design program of two-interconnected fluidized beds. Among three configurations of two-interconnected fluidized beds systems, the bubbling-bubbling system was selected as the best configuration. Process design results indicate that the SMART system is compact and feasible. Based on the selected operating conditions, the effects of variables such as process capacity, pressure, and weight percent of
absorbable component have been investigated as well.
Simulation for the Evaluation of Reforming Parameter Values of the Natural Gas Steam Reforming Process for a Small Scale Hydrogen-Fueling Station
Lee, Deuk-Ki ; Koo, Kee-Young ; Seo, Dong-Joo ; Seo, Yu-Taek ; Roh, Hyun-Seog ; Yoon, Wang-Lai ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 12~25
Numerical simulation of the natural gas steam reforming process for on-site hydrogen production in a
fueling station was conducted on the basis of process material and heat balances. The effects of reforming parameters on the process efficiency of hydrogen production were investigated, and set-point values of each of the parameters to minimize the sizes of unit process equipments and to secure a stable operability of the reforming process were suggested. S/C ratio of the reforming reactants was found to be a crucial parameter in the reforming process mostly governing both the hydrogen production efficiency and the stable operability of the process. The operation of the process was regarded to be stable if the feed water(WR) as a reforming reactant could evaporate completely to dry steam through HRSG. The optimum S/C ratio was 3.0 where the process efficiency of hydrogen production was maximized and the stable operability of the process was secured. The optimum feed rates of natural gas(NGR) and WR as reforming reactants and natural gas(NGB) as a burner fuel were also determined for the hydrogen production rate of
The Evaluation of Hydrogenation Properties on
Composite by Mechanical Alloying
Seok, Song ; Cho, Kyoung-Won ; Hong, Hae-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 26~31
Hydrogen has a high potential to be a renewable substitute for fossil fuels, because of its high gravimetric energy density and environment friendliness. In particular, Magnesium have attracted much interest since their hydrogen capacity exceeds that of known metal hydrides. One of the approaches to improve the kinetic is addition of metal oxide. In this paper, the effect of
concentration on the kinetics of Mg hydrogen absorption reaction was investigated.
composites have been synthesized by hydrogen induced mechanical alloying. The powder synthesized was characterized by XRD, SEM and simultaneous TG, DSC analysis. The hydrogenation behaviors were evaluated by using a sievert's type automatic PCT apparatus. Absorption and desorption kinetics of Mg catalyzed with 5,10 mass%
are determined at 423, 473, 523, 573, 623K.
Study on the Selective CO Oxidation Using
Kang, Dae-Kyu ; Lee, Young-Il ; Sohn, Jung-Min ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 32~39
CO oxidation and selective CO oxidation of
perovskite(x=1, 0.9, 0.7. 0.5; y=1, 0.9, 0.7, 0.5) were investigated. For CO oxidation, catalytic activities were studied according to different preparation conditions such as pH and calcination temperature. The influence of the change of the
concentration for selective CO oxidation was studied, too. The substitution of Ce for La improved the catalytic activity for CO oxidation and selective CO oxidation and best activity was observed for
prepared at pH 11 and calcined at
. The temperature of 90% CO conversion for CO oxidation using
. In contrast to the enhancement effect by Ce substitution, the partial substitution of Cu for Co in
decreased catalytic activities for CO oxidation reaction compared to that using
. For selective CO oxidation, the best CO conversion was 66% at
. The CO conversion of
was greatly increased from 66% to 91% as increasing
concentration from 1% to 2%.
Photocatalytic Degradation of MB with One-body Photoanode
Shim, Eun-Jung ; Bae, Sang-Hyun ; Yoon, Jae-Kyung ; Joo, Hyun-Ku ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 40~45
Methylene blue(MB) was photocatalytically degraded with one-body photoanode and solar simulator to investigate the possible application to both environmental purification and photoelectrochemical cell for hydrogen production. Photoactive titanium dioxide was formed on both sides of Ti plate following steps such as rinsing-annealing-calcination or anodizing(20 V, 30 V)-annealing(
after etching. The prepared titania plate(
, ca 1.6 mg
on the basis of
thickness) was used to degrade MB(10 ppm in 200 mL solution). The reaction tended to follow the Langmuir-Hinshelwood kinetics with zero order. Comparative experiments with Degussa P25 showed the same zero order kinetics when 2 mg of P25 had been used, while the first order kinetics when 200 mg used. This concludes the feasibility of the prepared titania plate as a material for the purification of low-level harmful organics and an electrode or a membrane for photoelectrochemical system for hydrogen production.
Preparation and Characterization of (La, Sr)
Electrode for High Temperature Steam Electrolysis by Glycine-Nitrate Process
Choi, Ho-Sang ; Kim, Hyun-Jin ; Ryu, Si-Ok ; Hwang, Gab-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 46~51
LSM powder material for an oxygen-electrode(anode) of High Temperature Steam Electrolysis (RISE) was synthesized by a Modified-Glycine nitrate process(GNP). Amount of nitric acid and its concentration was varied to find out an appropriate composition for the oxygen-electrode(anode). In order to optimize the amount of Glycine used as an oxidant of self-combustion process, the ratio of Glycine to Anion was varied.
were synthesized in this study. Those LSM were dried for overnight to remove moisture from the material at
and were calcined 2 hours at
and were sintered in a furnace for 5 hours at
. Their structures, surface morphologies, surface areas, and weight changes were investigated with XRD, SEM, BET, and TG/DTA. The best perovskite phase for the oxygen-electrode of HTSE was obtained with
formula in which 100 ml of 3M nitric acid was used in the preparation of its formula. The optimized ratio of Glycine to Anion was 2.
Effects of the Addition of Mn and
Type Alloy on the Electrochemical Characteristics of Ti-Cr-V BCC Type Alloys
Kim, J.Y. ; You, J.H. ; Park, C.N. ; Park, C.J. ; Choi, J. ; Cho, S.W. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 52~59
We investigated the effects of the addition of Mn and
type alloy on the electrochemical characteristics of Ti-Cr-V BCC type alloys as anode materials for Ni-MH battery. The activation behavior and discharge capacity of the BCC type alloys were significantly improved by ball-milling with the
alloy, because the
type alloy acted as hydrogen path on the surface of the BCC type alloy. Among the Mn substituted alloys(
alloy ball-milled with
type alloy exhibited the greatest discharge capacity of
. In addition, Mn substituted alloys exhibited the lower plateau pressure in P-C- T curve, the better hydrogen storage capacity and faster surface activation compared with the alloy without Mn.
Design and Performance Evaluation for a Fuel Cell/Battery Hybrid Mini-Bus Based on a Simulation
Kim, Min-Jin ; Kong, Nak-Won ; Lee, Won-Yong ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 60~66
In terms of the vehicle efficiency, a fuel cell hybrid system has advantages compared to a conventional internal combustion engine and a fuel cell alone-powered system. The efficiency of the fuel cell hybrid vehicle mainly depends on the maximum power of the fuel cell and therefore it is important to decide the design value of the fuel cell maximum power. In this paper, to estimate the performance of the fuel cell hybrid mini-bus in the design phase the simulator based on the models for the fuel cell stack, the electric battery, the fuel cell balance of plant, the controller, and the vehicle itself is proposed. Additionally, the hybrid mini-bus efficiencies with several different fuel cell powers are simulated for a city driving schedule and are compared on another. Consequently, the proposed simulation scheme is useful to determine the best design value of the fuel cell hybrid vehicles.
Feasibility of Backfire Control and Engine Performance with Different Valve Overlap Period of Hydrogen-Fueled Engine with External Mixture
Huynh, Thanh Cong ; Kang, J.K. ; Noh, K.C. ; Lee, J.T. ; Lee, J.H. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 67~74
Hydrogen Enrichment Effects on NOx Formation in Pre-mixed Methane Flame
Kim, H.S. ; Ahn, K.Y. ; Gupta, A.K. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 75~84
The effects of hydrogen enrichment to methane on NOx formation have been investigated with swirl stabilized pre-mixed hydrogen enriched methane flame in a laboratory-scale pre-mixed combustor(nominally of 5,000 kcal/hr). The hydrogen enriched methane fuel and air were mixed in a pre-mixer and introduced to the combustor through different degrees of swirl vanes. The flame stability was examined for different amount of hydrogen addition to the methane fuel, different combustion air flow rates and swirl strengths by comparing equivalence ratio at the lean flame limit. The hydrogen addition effects and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using gas analyzers, and OH chemiluminescence techniques to provide information about species concentration of emission gases and flowfield. The results of NOx and CO emissions were compared with a diffusion flame type combustor. The results show that the lean stability limit depends on the amount of hydrogen addition and the swirl intensity. The lean stability limit is extended by hydrogen addition, and is reduced for higher swirl intensity at lower equivalence ratio. The addition of hydrogen increases the NOx emission, however, this effect can be reduced by increasing either the excess air or swirl intensity. The NOx emission of hydrogen enriched methane premixed flame was lower than the corresponding diffusion flame under the fuel lean condition.
Production of Fuels from an Agricultural by-Product Biomass
Lee, Jong-Jib ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 85~94
Rice straw, produced as an agricultural by-product, is usable biomass as fuels if depolymerized to monomer unit, because the chemical structure are similar to high octane materials found in gasoline. In this study, parameters of thermochemical degradation by solvolysis reaction of rice straw such as the effect of reaction temperature, reaction time and type of solvent on conversion yield and degradation products were investigated. It was found that the effectiveness of the solvent on the solvolysis reaction was as follows; acetone>cresol>butanol. When acetone was used as a solvent, the highest rice straw conversion was observed to be 91.5% at
, 40 min. Combustion heating value of liquid products from thermochemical conversion processes was in the range of 7,380 cal/g. The energy yield and mass yield in acetone-solvolysis of rice straw was as high as 69.0% and 38.2 g-oil/100g-raw material after 40 min of reaction at
. Various aliphatic and aromatic compounds were detected in the rice straw solvolysis products. The major components of the solvolysis products, that could be used as fuel, were 4-methyl-2-pentanone, 3,5,5-trimethyl-2-cyclopentan-1-one as ketones.
Technology Trend for Water Electrolysis Hydrogen Production by the Patent Analysis
Hwang, Gab-Jin ; Kang, Kyung-Seok ; Han, Hye-Jung ; Kim, Jong-Wook ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 1, 2007, Pages 95~108
There are several methods for the hydrogen production such as steam reforming of natural gas, photocatalytic method, biological method, electrolysis and thermochemical method, etc. These days it has been widely studying for the hydrogen production method having low hydrogen production cost and high efficiency. In this paper, patents in the hydrogen production by water electrolysis were gathered and analyzed. The search range was limited in the open patents of USA(US), European Union(EP), Japan(JP), and Korea(KR) from 1996 to 2005. Patents were gathered by using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies, and technologies.