Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Institute of Gas
Journal Basic Information
Journal DOI :
The Korean Institute of GAS
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Apr 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
Selecting the target year
Numerical Study on the Strength Safety of High Pressure Gas Cylinder
Kim, Chung-Kyun ; Kim, Seung-Chul ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 1~6
The strength safety of high pressure gas cylinder has been analyzed by using a finite element method. In this study, the internal gas pressures of a steel bombe include a service charging pressure of
, high limit charging pressure of
, high limit of safety valve operation pressure
, and hydraulic testing pressure of
. The computed FEM results indicate that the strength safety for a service charging pressure of
and high limit charging pressure of
is safe because the stress of a gas cylinder is within yield strength of steel. But the stress for a hydraulic testing pressure of
sufficiently exceeds the yield strength and remains under the tensile strength. If the hydraulic testing pressures frequently apply to the gas cylinder, the bombe may be fractured because a fatigue residual stress is accumulated on the lower round end plate due to a plastic deformation. The computed results show that the concentrated force in which is applied on a skirt zone does not affect to the lower round end plate, and the most weak zone of a bombe is a middle part of a lower round end plate between a bombe body and a skirt for a gas pressure. Thus, the FEM results show that the profile of a lower round end plate is an important design parameter of a high pressure gas cylinder.
Effects of La Addition and Preparation Methods on Catalytic Activities for Methane Partial Oxidation Catalysts
Cheon, Han-Jin ; Shin, Ki-Seok ; Ahn, Sung-Hwan ; Yoon, Cheol-Hun ; Hahm, Hyun-Sik ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 7~14
Synthesis gas was produced by the partial oxidation of methane. For the preparation of catalysts, Ni, known to be active in this reaction and cheap, was used as the active component and
, having high oxygen storage capability and high redox ability, was used as the support. The catalysts were prepared by the impregnation and urea methods. The catalyst prepared by the urea method showed about 11 times higher surface area and finer particle size than that prepared by the impregnation method. The catalysts prepared by the urea method showed higher methane conversion and synthesis gas selectivity than that prepared by the impregnation method. In this reaction, carbon deposition is a problem to be solved, so La was added to the catalyst system to reduce the carbon deposition. TGA analysis results showed that there was 2% carbon deposition with La-added catalysts and 16% with La-free catalysts. It was found that the addition of La decreases the amount of carbon deposition and prevents catalyst deactivation.
A Study on the Estimation of Human Damage Caused by Vapor Cloud Explosion(VCE) in LPG Filling Station
Leem, Sa-Hwan ; Huh, Yong-Jeong ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 15~21
The demand of gas as an eco-friendly energy source has being increased. With increasing the LPG demand, the number of LPG filling station. In this work, the influence on over-pressure caused by Vapor Cloud Explosion in gas station was calculated by using the Hopkinson's scaling law and injury effect by the accident to a human body was estimated by applying the probit model. As a result of the injury estimation conducted by using the probit model for leakage 10% of 20ton storage tank. The distances from LPG station for death and tympanum rupture are 36.5 and 290 meters, respectively.
Estimation of Density of Methane and Ethane and Vapor-Liquid Equilibrium Predictions for Methane-Ethane Binary System Using PR and PC-SAFT Equations of State
Park, Jong-Kee ; Choi, Kun-Hyung ; Lee, Sang-Gyu ; Yang, Young-Myung ; Cho, Jung-Ho ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 22~26
In this study, experimental vapor pressures and densities of vapor and liquid phases versus temperature were estimated using PC-SAFT equation. The estimated results were compared with those using PR equation of state. For the vapor phase densities, both equations well predicted the literature data. However, PC-SAFT equation showed better prediction capability for liquid phase densities. In the comparison of vapor-liquid equilibrium prediction capability for the binary systems of methane and ethane, PC-SAFT equation was better than the PR equation.
Investigation of the Gas Accident Models through the Analysis Gas Accident Occurring Environment
Hur, Young-Taeg ; Lee, Su-Kyung ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 27~33
Analysis of gas accidents for 11.5 years, from 1998 to June, 2009, by types has been made in this study to prevent the recurrence of accidents through the analysis of gas accident occurring environment. Gas using environment and gas accidents are forced to be closely connected since the number of gas accidents has not only been decreased but occurred steadily and gas using types are changing by time period, weather, etc. in terms of accident contents. Gas accidents have been occurred more in capital areas with larger gas usage and specific local governments. The possibility of the gas accidents hit the highest when the weather is clear, the wind speed is low and the humidity is in the middle. In addition, leakage of gas, fire or explosion are also considered to be closely related with the weather as a result of model observance of gas accidents types. All the gas related possible accidents are also considered to be predictable if this result is to be analysed in association with the weather.
A Study on the Flame Curvature Characteristics in a Lifted Flame
Ha, Ji-Soo ; Kim, Tae-Kwon ; Park, Jeong ; Kim, Kyung-Ho ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 34~39
Flame propagation velocity is the one of the main mechanism of the stabilization of triple flame. To quantify the triple flame propagation velocity, Bilger presents the triple flame propagation velocity through the experiment, depending on the mixture fraction gradient, based on the laminar jet flow theory. However, in spite of these many analyses, there has not been any attempt to quantify the triple flame propagation velocity with the radius of flame curvature. In the present research, a relation of the flame propagation velocity is proposed with the radius of flame curvature for the flame stabilization mechanism. As a result, we have shown that the height of lifted flame is determined with the nozzle diameter and exit velocity of fuel and presented that the radius of flame curvature is proportion to the nozzle exit velocity of fuel and height of lifted flame. Therefore, the importance of the radius of flame curvature has to be recognized. To discribe the flame stabilization mechanism, Bilger's formula has to be modified with flame curvature effect.
A Study on Integrated Control and Safety Management Systems for LNG Membrane Storage Tank
Kim, Chung-Kyun ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 40~46
In this study, the integrated control and safety management system for a super-large LNG membrane storage tank has been presented based on the investigation and analysis of measuring equipments and safety analysis system for a conventional LNG membrane storage tank. The integrated control and safety management system, which may increase a safety and efficiency of a super-large LNG membrane storage tank, added additional pressure gauges and new displacement/force sensors at the steel anchor between an inner tank and a prestressed concrete structure. The displacement and force sensors may provide clues of a membrane panel failure and a LNG leakage from the inner tank. The conventional leak sensor may not provide proper information on the membrane panel fracture even though LNG is leaked until the leak detector, which is placed at the insulation area behind an inner tank, send a warning signal. Thus, the new integrated control and safety management system is to collect and analyze the temperature, pressure, displacement, force and LNG density, which are related to the tank system safety and leakage control from the inner tank. The digital data are also measured from measurement systems such as displacement and force of a membrane panel safety, LNG level and density, cool-down process, leakage, and pressure controls.
Numerical Study on Reduction in Frictional Loss for a Sandwitch Type of Pressure Regulator
Seo, Dong-Kyun ; Lee, Jung-Hoon ; Hwang, Jung-Ho ; Kim, Kwang-Soo ; Kim, Kang-Dae ; Kim, Dong-Soo ;
Journal of the Korean Institute of Gas, volume 14, issue 2, 2010, Pages 47~52
The development of energy saving system with pressure regulator has recently been received interests. Since the internal geometry in the pressure regulator is small and complex, the frictional loss in it is critical. In this study, the pressure loss with tip size, tip position, and mass flow was investigated using numerical approaches(CFD). The aimed reduction in pressure were achieved as the ratio of t/T was more than 0.8. In addition, there was no effect of the tip position.