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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
Journal Basic Information
Journal DOI :
The Korean Institute of GAS
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Volume & Issues
Volume 15, Issue 6 - Dec 2011
Volume 15, Issue 5 - Oct 2011
Volume 15, Issue 4 - Aug 2011
Volume 15, Issue 3 - Jun 2011
Volume 15, Issue 2 - Apr 2011
Volume 15, Issue 1 - Feb 2011
Selecting the target year
A Trends Analysis on Safety for CNG/HCNG Complex Fueling Station
Lee, Seung-Hyun ; Kang, Seung-Kyu ; Sung, Jong-Gyu ; Lee, Young-Soon ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 1~8
DOI : 10.7842/kigas.2011.15.2.001
In this research, the safety trends and technologies of HCNG, a mixture of hydrogen and natural gas, are analyzed. This is an attracting alternative fuels to meet the strengthened automotive exhaust gas emission standards. HCNG is very important opportunities and challenges in that it is available the existing CNG infrastructures, meets the strengthened emission standards, and the technical, social bridge of the coming era of hydrogen. It is essential for the commercialization of HCNG that hydrogen - compressed natural gas blended fuel for use in preparation of various safety considerations included accidents scenario, safety distance, hydrogen attack, ignition sources and fire detectors are examined. Risk assessments also are suggested as one of permission procedure for HCNG filling station.
A Study of Hydrogen Embrittlement on a Material of CNG Storage Tank
Han, J.O. ; Lee, Y.C. ; Lee, J.S. ; Chae, J.M. ; Hong, S.H. ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 9~14
DOI : 10.7842/kigas.2011.15.2.009
A set of test was conducted on a SA-372 steel for CNG storage tank to study the effect of hydrogen embrittlement. Tensile tests were carried out several conditions such as CNG, HCNG and H2 gas environment including air and Ar under the 35 MPa. Also, the test speed was set at 4*10^-4/s and 4*10^-5/s respectively. To maintain the high pressure for environmental gas during test process, we chose MTS which was installed autoclave. Test results showed that tensile stress, elongation rate and cross sectional contraction under Ar and CNG charging condition were similar to that of reference of air. And there was little bit change with test speed variations. However, hydrogen added conditions such as HCNG and H2 were revealed noticeable change in elongation rate and cross sectional contraction. Tensile stress was still uniform for all conditions. From the results, the effect of hydrogen embrittlement was confirmed on the hydrogen enriched conditions. Also its effect was showed more strong with much hydrogen concentration and slower test speed.
A Study on the Optimization of Combustion and Emission Performance in a Heavy-duty HCNG Engine
Choi, Young ; Park, Chul-Woong ; Won, Sang-Yeon ; Kim, Chang-Gi ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 15~20
DOI : 10.7842/kigas.2011.15.2.015
Although CNG is able to meet the current emission standards, it is expected to be impossible to satisfy the requirements of the next EURO-6 emission regulation without an additional after-treatment device. Hydrogen is known to be a gaseous fuel which features the wide flammability limit and the fast reactivity. A certain amount of hydrogen addition to CNG is able to extend the lean combustion range and produce lesser amounts of harmful emissions. In this research, the combustion and emission characteristics of HCNG(mixture of Hydrogen and CNG) fuel were experimented in an 11-liter heavy duty lean burn engine varying hydrogen contents, air-to-fuel ratio and spark timing. The optimization of this HCNG engine for a city bus was performed through the evaluations of oxidation catalyst characteristics.
A Trend of Catalyst Technology for After treatment on H
-CNG Mixed Fuel Vehicles
Lee, Ung-Jae ; Shim, Kyung-Sil ; Jung, Ju-Yong ; Kim, Tae-Min ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 21~26
DOI : 10.7842/kigas.2011.15.2.021
Emissoin of heavy duty vehicle have much positioned in air pollution although its limited number of vehicles. CNG vehicles are coming to the fore as one of the solution of diesel vehicles. CNG vehicles exhaust smaller emission than diesel vehicles on PM and NOx. In this study, aftertreatment technologies are introduced on vehicles which use CNG and hydrogenmixed fuel. Withmixing hydrogen with CNG, combustion efficiency is enhanced, and harmful emission might be decreased, but methane that is main component of CNG brings green house effect. In order to remove methane and NOx in exhaust gas of CNG engine, methane oxidation catalyst and SCR technologies were respectively analyzed.
Defect Length Estimation Using SQI for Underground Gas Pipelines
Kim, Min-Ho ; Choi, Doo-Hyun ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 27~32
DOI : 10.7842/kigas.2011.15.2.027
In this paper a new defect length estimation algorithm using SQI(self quotient image) is presented for the MFL(magnetic flux leakage) inspection of underground gas pipelines. Gas pipelines are magnetized by the permanent magnets of the MFL PIG(pipeline inspection gauge) when the PIG runs through pipelines. If defects or corrosions exist in the pipeline, magnetic leakage flux is increased. The MFL signals measured by hall sensors are analyzed to estimate defect length using SQI. For 74 real defects carved in KOGAS pipeline simulation facility(KPSF) the accuracy of defect length estimation of the proposed algorithm was compared with that of conventional methods.
The Risk Analysis for the Rail Transport of Explosives
Lee, Jae-Hean ; Song, Dong-Woo ; Lee, Su-Kyung ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 33~39
DOI : 10.7842/kigas.2011.15.2.033
This study presented quantitative risk analysis in case of transporting explosive materials by railway. Accident types were classified into accidents of in station and in transit. And the study presented an initial value of accident frequency through derailment accident and crushing one according to each type, and drew the results of accident frequency through event tree analysis. Damage impact evaluation used TNT equivalent method and probit analysis method. As the result of risk evaluation, railway transportation of explosive materials passing through areas which are high in population density is appeared to be able to cause a large number of personnel injury when occurring accidents. Specially, the accident of explosive transportation combined with petroleum was forecasted as easily resulting in large explosive accident. Consequently, there is a necessity to reduce consequences by decreasing passage through areas where are high in population density, and take measures for lessening the risks in case of transporting dangerous explosive materials.
Cost-Benefit Analysis in order to Select the Reasonably Practical Risk Reduction Measures(RRMs) on High Pressure Urban Gas Pipelines
Ryou, Young-Don ; Kim, Young-Seob ; Lee, Su-Kyung ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 40~46
DOI : 10.7842/kigas.2011.15.2.040
The purpose of CBA(cost-benefit analysis) in risk assessment is to show whether the benefits of implementing additional risk reduction methods(RRMs) derived through risk assessment outweigh its costs and it is proper to implement the methods. In this paper CBA has been conducted in order to select the most effective and reasonable RRM as implementing the RRM derived after QRA for the high pressure urban gas pipelines. As conducting QRA again by applying the derived RRMs, No. 10 measure which includes pipeline corrosion monitoring, MOV(motor operated valve) installation and the method to protect pipeline damage caused by third-party mechanical interference has showed the highest risk reduction effect. Also it has been considered to be reasonably practicable by conducting CBA and then is selected as the most effective and reasonable RRM on the objects of this paper.
A Study on The Flame Propagation Velocity of Laminar Lifted Flame with Flame Curvatur e and Scalar Dissipation Rate
Kim, Kyung-Ho ; Kim, Tae-Kwon ; Park, Jeong ; Ha, Ji-Soo ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 47~56
DOI : 10.7842/kigas.2011.15.2.047
Flame propagation velocity is the one ofmainmechanismof the stabilization of triple flame. To quantify the triple flame propagation velocity, Bilger presents the triple flame propagation velocity depending on the mixture fraction gradient, based on the laminar jet flow theory. However, in spite of these many analyses, there was not presented any relation of these variables, triple flame propagation velocity, radius of flame curvature and scalar dissipation rate indirectly. In the present research, we have checked the results of numerical simulation with experiment and numerical analysis and verified the flame propagation velocity with a scalar dissipation rate proposed by Bilger through the numerical simulation. Also we have clarified that flame propagation velocity was depended on the radius of flame curvature and scalar dissipation rate.
Consequence Analysis by Different DME-LPG Mixture Fuels
Park, Dal-Jae ; Lee, Young-Soon ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 57~62
DOI : 10.7842/kigas.2011.15.2.057
DME(Dimethyl Ehther) is considered as an attractive fuel in terms of clean, environmentally friendly form of energy, multi-source and multi-purpose. As the physical properties of DME are almost similar to LPG, DME can be mixed with LPG and DME-LPG mixture fuels seem to be employed without major remodeling of the existing LPG supply infrastructure. However, little attention has been given to the effect of different DME-LPG mixture fuels on consequence analysis to adjacent facilities, buildings and etc. In this work, the consequence analysis by different DME-LPG mixture fuels has been done. The results were discussed in terms of release rate, jet fire, vapor cloud explosions, BLEVEs and etc. It was found that the consequences estimated from fire and explosion scenarios assumed were almost similar for both LPG and DME 20 %.
Performance and Emission Comparisons of a SI Engine Fueled by Syngas with Varying Hydrogen Content
Park, Seung-Hyun ; Lee, Sun-Youp ; Park, Cheol-Woong ; Lee, Jang-Hee ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 63~68
DOI : 10.7842/kigas.2011.15.2.063
As an effective utilization of biomass, organic wastes and coal, attention has been made to use syngas to a reciprocating engine to generate power. However, significant component variation of syngas depending upon origin and gasification conditions, and its lower heating value than that of LPG and CNG can create difficulties in stable engine operation. Thus it is necessary to address these issues in order to successfully develop power generation engines. As a primary step to resolve these problems, effects of H2 content variation in syngas on engine performance and emission characteristics were discussed in this study. The results show that as H2 % in syngas increases, more stable combustion was achieved with retarded MBT spark timing and engine efficiency becomes maximum with syngas of 10% H2. In addition, NOx emission increased while THC emission decreased as H2 % rises in the syngas.
Estimation of Effect Zone for the Establishment of Damage-Minimizing Plan of Chemical Plants
Lee, Hern-Chang ; Han, Seong-Hwan ; Cho, Ji-Hoon ; Shin, Dong-Il ; Kim, Tae-Ok ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 69~74
DOI : 10.7842/kigas.2011.15.2.069
As a way to propose a method for the establishment of practical damage-minimizing plan for chemical plants, the release scenario was established by using API-581 BRD and the effect zone was estimated by the KS-RBI program supporting the quantitative cause analysis. And the risk assessment was performed. As a result, we found that to minimize the damage of a chemical plant, it is effective to use four release hole diameters (small, medium, large and rupture) and release time estimated according to the classes of detection and isolation systems. In addition, it can be safely said that through appling the damage areas considering weighted average by failure frequency and worst-case simultaneously, industrial sites can come up with the effective emergency response plan.
The Measurement and Investigation of Fire and Explosion Properties for Cyclohexane
Ha, Dong-Myeong ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 75~81
DOI : 10.7842/kigas.2011.15.2.075
For the safe handling of cyclohexane, the explosion limit at
and the temperature dependence of the explosion limits were investigated. Flash point and AIT(autoignition temperature) for cyclohexane were experimented. By using the literatures data, the lower and upper explosion limits of cyclohexane recommended 1.0 Vol% and 9.0 Vol%, respectively. Moreover lower flash points of cyclohexane recommended
. It was measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for cyclohexane, and the experimental AIT was
. The new equations for predicting the temperature dependence of the explosion limits of cyclohexane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.
Flammability and Thermal Stabilities of Heat Transfer Oils
Lee, Keun-Won ; Lee, Jung-Suk ; Choi, Yi-Rac ;
Journal of the Korean Institute of Gas, volume 15, issue 2, 2011, Pages 82~87
DOI : 10.7842/kigas.2011.15.2.082
Heat transfer oils are used in applications such as heating systems of chemical plant, refinery heat exchange systems, gas plant process, injection molding systems, and pulp and paper processing. These oils are extremely stable and resistance to thermal and oxidative degradation. In the event of a spill or accidental release of heat transfer oils, it can be ignite easily when there is an ignition source. This paper discusses the flammability and thermal stabilities of new and used oils. The flammability of the oils are assessed by measuring changes in flash point and auto ignition temperature. The thermal stability of oils are evaluated by the thermal screening unit (
) and the differential scanning calorimeter (DSC). From the experimental results, it is suggested to give fire hazard characteristics to safe precautions for the proper use and treatment of heat transfer oils.