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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
Experimental Study of Hydrogen and Syngas Production over Ni/Ce-ZrO
Catalysts with Additives
Cho, Wonjun ; Yu, Hyejin ; Mo, Yonggi ; Ahn, Whaseung ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 105~113
DOI : 10.7316/KHNES.2014.25.2.105
Performance tests on
catalysts with additives (MgO,
) were investigated in the combined reforming processes (SCR, ATR, TRM) in order to produce hydrogen and carbon monoxide (it is called "syngas".). The catalyst characterization was conducted using the BET surface analyzer, X-ray diffraction (XRD), SEM, TPR and TGA. The combined reforming process was developed to adjust the syngas ratio depending on the synthetic fuel (methanol, DME and GTL) manufacturing processes. Ni-based catalysts supported on alumina has been generally recommended as a combined reforming reaction catalyst. It was found that both free NiO and complexed NiO species were responsible for the catalytic activity in the combined reforming of methane conversion, and the
binary support employed had improved the oxygen storage capacity and thermal stability. The additives, MgO and
, also seemed to play an important role to prevent the formation of the carbon deposition over the catalysts. The experimental results were compared with the equilibrium data using a commercial simulation tool (PRO/II).
The Synthesis of FT Oil from Syngas (H
+CO) over Co-based Catalyst
Park, Yonhee ; Joo, Woosung ; Jung, Jongtae ; Lee, Sseungho ; Baek, Youngsoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 114~121
DOI : 10.7316/KHNES.2014.25.2.114
The synthesis of Fischer-Tropsch oil is the catalytic hydrogenation of CO to give a range of products, which can be used for the production of high-quality diesel fuel, gasoline and linear chemicals. Our cobalt catalyst was prepared Co/alumina, Co/silica and Co/titania by the incipient wetness impregnation of the nitrates of cobalt with supports. Co-based catalysts was calcined at
before being loaded into the FT reactors. After the reduction of catalyst has carried out under
, FT reaction of the catalyst has carried out at GHSV of 4,000 under
and 20atm. From test results, the order of increasing activity for the catalyst was Co/alumina > Co/silica > Co/titania. When the content of Co metal such as 5, 12, 20 and 30wt% was changed, an CO conversion increased as the content of Co metal increased. The activity of catalyst has obtained the best value at 12wt% Co content.
Attrition Characteristics of WGS Catalysts for SEWGS System
Ryu, Hojung ; Lee, Dongho ; Lee, Seungyong ; Jin, Gyoungtae ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 122~130
DOI : 10.7316/KHNES.2014.25.2.122
Attrition characteristics of WGS catalysts for pre-combustion
capture were investigated to check attrition loss of those catalysts, to check change of particle size distribution during attrition tests, and to determine solid circulation direction of WGS catalysts in a SEWGS system. The cumulative attrition losses of two catalysts increased with increasing time. However, attrition loss under humidified condition was lower than that under non-humidified condition case for long-term attrition tests. Between two catalysts, attrition loss of PC-29 catalyst was higher than that of MDC-7 catalyst for long-term attrition tests. However, the MDC-7 catalyst generated much more fines than PC-29 catalyst during attrition. Therefore, we conclude that the PC-29 catalyst is more suitable for fluidized bed operation if we take into account the separation efficiency of cyclone. Based on the results from the tests for the effect of humidity on the attrition loss, we selected solid circulation direction from SEWGS reactor to regeneration reactor because the SEWGS reactor contains more water vapor than regeneration reactor.
Effect of Carbon Fiber Filament and Graphite Fiber on the Mechanical Properties and Electrical Conductivity of Elastic Carbon Composite Bipolar Plate for PEMFC
Lee, Jaeyoung ; Lee, Wookum ; Rim, Hyungryul ; Joung, Gyubum ; Lee, Hongki ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 131~138
DOI : 10.7316/KHNES.2014.25.2.131
Highly conductive bipolar plate for polymer electrolyte membrane fuel cell (PEMFC) was prepared using phenol novolac-type epoxy/graphite powder (GP)/carbon fiber filament (CFF) composite, and a rubber-modified epoxy resin was introduced in order to give elasticity to the bipolar plate graphite fiber (GF) was incorporated in order to improve electrical conductivity. To find out the cure condition of the mixture of novolac-type and rubber-modified epoxies, differential scanning calorimetry (DSC) was carried out and their data were introduced to Kissinger equation. And tensile and flexural tests were carried out using universal testing machine (UTM) and the surface morphology of the fractured specimen and the interfacial bonding between epoxy matrix and CFF or GF were observed by a scanning electron microscopy (SEM).
Study on Applicability of Household Fuel Cell System with Operating Methods
Park, Deaheum ; Cha, Kkwangseok ; Jung, Younguan ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 139~144
DOI : 10.7316/KHNES.2014.25.2.139
A Fuel Cell is one of the solving to reduce greenhouse gases. Despite the high efficiency and environmental friendly of Household Fuel Cell System it has hardly obtained popularity mainly due to its high prices. In order to encourage use of the system prices and operational expenses need to become economical. In this study, optimization through simulation was conducted to find out the optimal operational condition. As a result of simulation the system is operated with DSS operation from 5 O'clock until 19 O'clock for 13 hours at the constant output of 0.4kW to maximize reduction of energy rate. Furthermore, instead of the domestic system with the rated output of 1kW, rated output of the system should be reduced to 0.4 - 0.6kW which can promote installation of household Fuel Cell System.
Preparation of the Anti-Reflective(AR) Coating Film by Sol-Gel Method to Improve the Efficiency of Solar Cell
Kim, Hyosub ; Kim, Youngho ; Choi, Jaeyune ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 145~150
DOI : 10.7316/KHNES.2014.25.2.145
This study investigates the preparation of anti-reflective (AR) coating film to improve the efficiency of solar cell. The AR coating film was successfully obtained by dip-coating with AR coatings prepared by sol-gel method. Fluoroalkylsilane was additionally introduced into the coatings to give the self-cleaning effect of AR coating film. We performed the abrasion test, pencil scratch hardness test and cross-cut test to identify the mechanical strength of AR coating film. As the results, the transmittance of AR coating films with 9.07, 18.13 and 27.20 of IPA/MTMS molar ratios were 93.1, 93.6 and 95.3%, respectively. The water contact angle and transmittance of AR coating film increased by the introduction of hydrophobicity. The prepared AR coating film shows the high level of abrasion, hardness and adhesion. The IPA/MTMS molar ratio of 27.20 and the withdrawing speed range of 0.20 ~ 0.28cm/sec are the optimal coating condition in terms of the transmittance and mechanical strength of AR coating film.
The Synthesis and Characteristics of Covalently Cross-Linked SPEEK/Cs-substituted TPA/CeO
Composite Membranes for PEMWE
Hwang, Sungha ; Park, Daeyoung ; Oh, Seunghee ; Yoon, Daejin ; Oh, Yunsun ; Seo, Hyeon ; Kang, Aansoo ; Moon, Sangbong ; Chung, Janghoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 151~160
DOI : 10.7316/KHNES.2014.25.2.151
composite membrane was prepared for polymer electrolyte membrane water electrolysis (PEMWE). In order to improve the electrochemical, mechanical, durabilities and electrocatalytic characteristics, engineering plastic of polyether ether ketone (PEEK) as polymer matrix was sulfonated and the organic-inorganic blend composite membranes was prepared by loading cesium-substituted tungstophosphoric acid (Cs-TPA) by titration method with cross-linking agent contents of 0.01mL. Ceria (
) was used to scavenge free radicals which attack the membrane in the PEMWE circumstance and to increase the duration of the membrane. CL-SPEEK/
-TPA/CeriaIn conclusion, 1% membrane showed the optimum results such as 0.119 S/cm at
of proton conductivity and 62MPa of tensile strength.
A Study on Safety Policies for a Transition to a Hydrogen Economy
Jun, Daechun ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 161~172
DOI : 10.7316/KHNES.2014.25.2.161
Hydrogen, which can be produced from abundant and widely distributed renewable energy resources, seems to be a promising candidate for solving the concerns for improving energy security, urban air pollution, and reducing greenhouse gas emissions. The two primary motivating factors for hydrogen economy are fossil fuel supply limitations and concerns about global warming. But the safety issues associated with hydrogen economy need to be investigated and fully understood before being considered as a future energy source. Limited operating experience with hydrogen energy systems in consumer environments is recognised as a significant barrier to the implementation of hydrogen economy. To prevent unnecessary restrictions on emerging codes, standards and local regulations, safety policies based on real hazards should be developed. This article studies briefly the direct impact-distances from hazard events such as hydrogen release and jet fire, and damage levels from hydrogen gas explosion in a confined space. Based on the direct impact-distances indicated in the accident scenarios and consumer environments in Korea, the safety policies, which are related to hydrogen filling station, hydrogen fuel cell car, portable fuel cell, domestic fuel cells, and hydrogen town, are suggested to implement hydrogen economy. To apply the safety policies and overcome the disadvantages of prescriptive risk management, which is setting guidance in great detail to management well known risk but is not covering unidentified risk, hybrid risk management model is also proposed.
Preliminary Feasibility Study for Commercial DME Plant Project
Mo, Younggi ; Kang, Minseo ; Song, Taekyoung ; Baek, Youngsoon ; Cho, Wonjun ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 173~182
DOI : 10.7316/KHNES.2014.25.2.173
Dimethyl ether (DME) is a new clean fuel as an environmentally-being energy resources. DME has similar characteristics to those of LPG and can be substituted Diesel fuel. KOGAS has investigated and developed new innovative DME synthesis process from synthesis gas with KOGAS's own technologies. KOGAS had finished the construction of 10ton/day DME demonstration plant in 2008, we have established the basic design of commercial plant which can produce 3,000ton/day DME. Specifically, an economic model for a commercial DME project will be presented. It accounts for all the major cost factors that are considered in a commercial scale project as the model input for performing cash flow analysis, after which key economic indicators are produced including the internal rate of return (IRR), net present value (NPV). Sensitivity analysis is performed to identify dominant cost factors to the project economics and quantify their impact. The inputs to the economic analysis will be based on representative cost factors from the commercial-scale design of KOGAS' direct DME process supplemented by literature data. Case study results will be presented based on recent commercialization projects.
Compact Heat Exchanger Design for Biogas Application
Lee, Taeck Hong ; Kim, Tae Wan ; Park, Tae Sung ; Kang, Young Jin ; Noh, Jae Hyun ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 183~190
DOI : 10.7316/KHNES.2014.25.2.183
Our lab designs a heat exchangers for air and carbondioxide gas. Coolant is water, thus it is very difficult to determine heat transfer parameters in this gas-liquid system. Repeated experiments gives overdesign value 35%, overall heat transfer coefficient
for carbondioxide. Another series of experiments determine overdesign 18.7%, overall heat transfer coefficient
for Air. These parameters are in same range of literature. Overdesign is increasing as tube length increases, also increases as wall thickness of heat exchanger increases. To get proper fluid linear velocity in heat exchanger, we change the diameter of tube and finally we can have optimum fluid linear velocity in the heat exchanger.
Performance Characteristics of Double-Inlet Centrifugal Blower According to Inlet and Outlet Angles of an Impeller
Lee, Jong-Sung ; Jang, Choon-Man ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 191~199
DOI : 10.7316/KHNES.2014.25.2.191
Effects of design variables on the performance of a double-inlet centrifugal blower have been analyzed based on the three-dimensional flow analysis. Two design variables, blade inlet and outlet angles, are introduced to enhance a blower performance. General analysis code, ANSYS-CFX13, is employed to analyze internal flow and a blower performance. SST turbulence model is employed to estimate the eddy viscosity. Throughout the shape optimization of an impeller at the design flow condition, the blower efficiency and pressure are successfully increased by 4.7 and 1.02 percent compared to reference one. It is noted that separated flow observed near cut-off region can be reduced by optimal design of blade angles, which results in stable flow pattern in the blade passage and increase of a blower performance. The stable flow at the impeller also makes good effects at the outlet of a volute casing.
Effects of Working Fluids on the Performance Characteristics of Organic Rankine Cycle (ORC) Using LNG Cold Energy as Heat Sink
Kim, Kyoung Hoon ; Ha, Jong Man ; Kim, Kyung Chun ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 200~208
DOI : 10.7316/KHNES.2014.25.2.200
This paper presents thermodynamic performance analysis of organic Rankine cycle (ORC) using low temperature heat source in the form of sensible energy and using liquefied natural gas (LNG) as heat sink to recover the cryogenic energy of LNG. LNG is able to condense the working fluid at a very low condensing temperature in a heat exchanger, which leads to an increased power output. Based on the mathematical model, a parametric analysis is conducted to examine the effects of eight different working fluids, the turbine inlet pressure and the condensation temperature on the system performance. The results indicate that the thermodynamic performance of ORC such as net work production or thermal efficiency can be significantly improved by the LNG cold energy.
Effects of Operating Variables on CO Conversion of WGS Catalyst in a Fluidized Bed Reactor Equipped with Bed Insert
Park, Jihye ; Lee, Dongho ; Park, Youngeheol ; Moon, Jongho ; Rhee, Youngwoo ; Ryu, Hojung ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 2, 2014, Pages 209~217
DOI : 10.7316/KHNES.2014.25.2.209
To enhance the performance of SEWGS system by holding the WGS catalyst in a SEWGS reactor, a spring type bed insert was developed. In this study, effects of operating variables such as steam/CO ratio, gas velocity, syngas concentration on CO conversion were investigated in a fluidized bed reactor using the spring type bed insert to hold the WGS catalyst as tablet shape. CO conversion increased initially as the steam/CO ratio increased. But further increment of the steam/CO ratio caused decreasing of CO conversion because of increment of gas velocity and decrement of syngas concentration. Moreover, CO conversion decreased as the gas velocity increased and the syngas concentration decreased at the same steam/CO ratio. Continuous operation up to 48 hours (2 days) was carried out to check reactivity decay of WGS catalyst supported by spring type bed insert. The average CO conversion was 99.04% and we could conclude that the WGS reactivity at those conditions was maintained up to 48 hours.