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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 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
Process Simulation of HCNG Refueling System
Kim, Sang-Min ; Han, Jeong-Ok ; Lee, Yeong-Cheol ; Lee, Joong-Seong ; Kim, Yong-Cheol ; Chae, Jeong-Min ; Hong, Seong-Ho ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 1~7
DOI : 10.7842/kigas.2013.17.5.1
In this study, simulation work of HCNG refueling system was performed. The hydrogen was produced from steam reforming process by natural gas. The conversion of natural gas is increased as SCR is increased. but it was no significant difference more than 3 of SCR and fuel throughput is increased as GHSV is increased. Both conversion and fuel throughput levels was optimized when the
of GHSV. CNG was compressed from low pressure natural gas. For the mixing of
and CNG is mixed with the high pressure conditions such as 400bar of
and 250bar of natural gas. Single-stage compression was required more power than multi stage. So, multi stage compression was suggested for high pressure compression. We calculated the intermediate pressure to minimize total required power of compressors. The intermediate pressure for
and natural gas were derived at 61 and 65 bar, respectively.
A Study on the Full Load Performance and Emission Characteristics with Turbo-charger Change in a HCNG Engine
Park, Cheolwoong ; Kim, Changgi ; Lim, Gihun ; Lee, Sungwon ; Choi, Young ; Lee, Sunyoup ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 8~14
DOI : 10.7842/kigas.2013.17.5.8
Hydrogen-natural gas blends(HCNG) engine is optimizing technology of performance and emission characteristics with use of hydrogen`s fast flame speed and wide flammability limit. As lean-burn limit is extended, the improvement in thermal efficiency and harmful emissions can be achieved. However, the extension of lean-burn limit under a wide open throttle operation point could be realized with the increase in boosting capacity in a lean-burn engine with turbo-charging system. In the present study, the power output characteristics of HCNG engine with turbo-charger change is assessed and feasibility of the increase in boosting capacity is evaluated. The turbo-charger design with high efficiency at higher flow rate rather than higher boosting pressure makes efficient operation possible at relatively rich mixture condition.
Consequence Analysis of Hydrogen Blended Natural Gas(HCNG) using 3D CFD Simulation
Kang, Seung-Kyu ; Bang, Hyo-Jung ; Jo, Young-Do ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 15~21
DOI : 10.7842/kigas.2013.17.5.15
This study evaluated comparison of the risk according to the type of fuel by three-dimensional simulation tool(FLACS). The consequence analysis of fire explosion and jet-fire was carried out in the layout of a typical high-pressure gas filling stations using CNG, hydrogen and 30%HCNG. Under the same conditions, hydrogen had a 30kPa maximum overpressure, CNG had a 0.4kPa and HCNG had a 3.5kPa. HCNG overpressure was 7.75 times higher than the CNG measurement, but HCNG overpressure was only 11.7% compared to hydrogen. In case of flame propagation, hydrogen had a very fast propagation characteristics. On the other hand, CNG and HCNG flame propagation velocity and distance tended to be relatively safe in comparison to hydrogen. The estimated flame boundary distance by jet-fire of hydrogen was a 5.5m, CNG was a 3.4m and HCNG was a 3.9m.
Studies of Methane Oxidation Catalyst on H
-CNG Mixed Fuel Vehicles
Lee, Ung-Jae ; Shim, Kyung-Sil ; Yang, Jaechun ; Kim, Tae-Min ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 22~27
DOI : 10.7842/kigas.2013.17.5.22
HCNG engine is performed as a future engine because of high combustion efficiency and eco-friendly property, and is predicted to a brdge of hydrogen vehicles. As EURO-6 regulagion is due to be applied in 2014, consolidated regulations of methane gas that is exhausted from CNG and HCNG vehicles will come into effect. In this studies, methane oxidation catalyst is introduced to remove methane gas from HCNG emissions. Methane oxidation efficiency on catalyst was studied when it is driven long time. And characterization like metal dispersion, surface area was performed to investigate the correlation of catalyst efficiency and characteristics.
The Study on Synthesis Gas Characteristics Following Different Injection Condition of Oxidizing Agent Through Simulation of Underground Coal Gasification
Jang, Dong-Ha ; Yoon, Sang-Phil ; Kim, Hyung-Taek ; Kim, Jeong-Gyoo ; Cho, Won-Jun ; Ju, Woo-Sung ; Lee, Jin-Wook ; Lee, Chan ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 28~36
DOI : 10.7842/kigas.2013.17.5.28
The underground coal which is buried in the ground will have a lot of attention to overcome energy crisis as an energy resources standpoint. Many studies of underground coal gasification have been also conducted because of its advantage which does not require mining. In this study, the simulation of underground coal gasification process was carried out with Aspen Plus. This study was executed by Rock Mountain 1 Underground Coal Gasification project in the United States in the late 1980s as a reference. Sensitivity analysis proceeded to investigate synthesis gas characteristics following different injection condition of oxidizing agent. The underground coal gasification model has been implemented. That is divided into drying, pyrolysis, char gasification and the simulation results was confirmed by the production gas flow, yield of synthesis gas and amount of gasified carbon from results of the actual experimental data.
A Study on the Strength of the Helmets with a Lobe in the Summit
Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 37~41
DOI : 10.7842/kigas.2013.17.5.37
This paper presents the strength safety of stress and deformation behaviors using the finite element method as a function of the thickness of the protective helmets with and without an extruder on the top of the shell structure. The helmet that would provide head and neck protections without causing discomfort to the user when it was worn for long periods of time should be manufactured for increasing the safety and impact energy absorption. The stress analyzed results show that when the impulsive force of 4,540N is applied on the top surface of a helmet, the safe thickness is 3.7mm for the conventional helmet and 3.2mm for the modified new helmet. Based on the deformation analysis, the FEM results recommend that the safe thickness is 3.2mm for the conventional helmet and 2.0mm for the modified new helmet. Thus, it may be more safe design of the helmet, which has an extruded structure on the summit surface of the helmet.
Advancement Plan on Hazardous Material Classification and Comparative Study of the Criteria in UN GHS and Safety Control of Dangerous Substances Act
Lee, Bong Woo ; Lee, Kijun ; Park, Jeongpil ; Shin, Dongil ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 42~50
DOI : 10.7842/kigas.2013.17.5.42
With the rapid change of industry and the development of science and technology, more than 100,000 industrial chemicals are being used and 2,000 new materials are developed every year. Chemical products have had favorable influence on our daily life and contributed very much to the prosper of human culture. But some materials are inherently poisonous and dangerous. Korea ranks as the number 7 in world`s chemical products market and the chemical sector is contributing to the economic revival through importing and exporting of the products. With the increasing domestic as well as international interests about REACH and GHS, the need for the effective and efficient chemical material management system is getting bigger and bigger. In this research, we compare the criteria in UN GHS and Safety Control of Dangerous Substances Act of Korea for the development of global standard test methods and the classification and labelling for the chemicals, and suggest an advancement plan for the introduction of the GHS in a building block approach. In addition, providing the harmonized information about chemical hazards is suggested for the elimination of international trade barriers for chemical industries.
Stress and Strain Distribution of Gas Pipe According to Buried Depth
Cho, Jinwoo ; Choi, Bonghyuck ; Cho, Wonbeom ; Kim, Jinman ; Hong, Seongkyeong ; Jeong, Sekyoung ; Kim, Joonho ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 51~57
DOI : 10.7842/kigas.2013.17.5.51
Recently, improvement of materials and technologies for the manufacturing of gas pipe has it possible to reduce the buried depth. Compared to the criteria from advanced countries, Korea has conservative criteria for the buried depth of pipeline(about 50cm deeper). Therefore, this study investigated the effect of various buried depth(0.8m, 1.0m, 1.2m) on the stress and strain distribution of gas pipe. Numerical analysis and field tests were carried out with API 5L steel gas pipes. From the results, it can be suggested that the change of buried depth would not significantly affect the stress and strain distribution of gas pipe.
A Study on the Inner tank Seismic Analysis Model for Calculation of Seismic Forces of LNG Storage Tank
Kim, Miseung ; Lee, Kangwon ; Kim, Junhwi ; Yoon, Ihnsoo ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 58~63
DOI : 10.7842/kigas.2013.17.5.58
LNG(Liquefied Natural Gas) has been considered as the green energy. Thus, the demand of natural gas is keep increasing around the world, and various studies are actively under progress about the LNG storage tank. To calculate the seismic forces of actual LNG storage tank, FEM model has to include inner tank, outer tank, pile and soil to implement the interaction between structure and ground. So, this paper is represent the study about inner tank model of three cases using Malhotra method in EN 1998-4(European Standard). The results of calculation were compared, and the most suitable to inner tank model was suggested.
Non-Destructive Testing of Damaged Thermoplastic Pipes Electrofusion Joints Using Phased Array Ultrasonic
Kil, Seong-Hee ; Kim, Byung-Duk ; Kwon, Jeong-Rock ; Yoon, Kee-Bong ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 64~68
DOI : 10.7842/kigas.2013.17.5.64
Non destructive testing(NDT) methods of electrofusion(EF) joints of thermoplastics pipes are required for fusion joint safety and for the long term reliability of a pipe system. Electrofusion joints, which are joined at the proper fusion process and procedures, may encounter defects due to the difference of ovality between pipes and coupling, improper fusion process or porosity result from electrofusion joining. These defects can cause the failure of pipeline and by extension, they can be caused the limit to expand the use of plastics pipes. This paper studies inspection results using ultrasonic imaging method for damaged polyethylene electrofusion joints. Gas was leaking from 250mm diameter polyethylene electrofusion joints at February 2004 which was electrofused at December 1994 and operation pressure was 2.45kPa. First, surface inspection was conducted and then in order to find the types of defects examination using ultrasonic imaging method was performed. Lack of fusion and inappropriate inserting for polyethylene pipes into electrofusion coupling were found and causes of the gas leak were judged that misalignment and insert defect. Cutting inspection was performed and each inspection results were compared to. Results of ultrasonic imaging method and cutting inspection were the same.
Characteristic of Thermal Decomposition and Ignition Temperature of Magnesium Particles
Han, Ou-Sup ; Lee, Jung-Suk ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 69~74
DOI : 10.7842/kigas.2013.17.5.69
The study was conducted experimentally on characteristic of thermal decomposition and minimum ignition temperature of magnesium dusts. For this purpose, three different Mg dusts of mean diameter (38, 142,
) were used. Experimental investigations were conducted by using TGA(Thermo gravimetric analysis) and MIT(Minimum Ignition Temperature) apparatus made in accordance with IEC 61241-2-1 standard. As the results, temperature of weight gain in Mg dust layers increased with increasing of heating rates in air and, under the same heating rate condition, minimum ignition temperature increased with particle size. Also the MIT of suspended Mg dust clouds tended to increase with increasing of mean diameter.
Effect of Flame Retardants on Flame Retardancy of Rigid Polyurethane Foam
Kim, Keunyoung ; Seo, Wonjin ; Lee, Ju-Chan ; Seo, Jung-Seok ; Kim, Sangbum ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 75~80
DOI : 10.7842/kigas.2013.17.5.75
In this study, the effect of phosphorus flame retardants on the flame retardancy of the rigid polyurethane foam(PUF) was studied. Tetramethylene bis(orthophos-phorylurea)[TBPU] and Tris(2-chloroethyl) phosphate[TCEP], Tris(2-chloropropyl)phosphate [TCPP], Triethyl phosphate[TEP] were used as flame retardant. It was found that TBPU added PUF exhibits low mean heat release rate(HRR), peak HRR, effective heat of combusion(EHC), mass loss rate (MLR), CO yield and
compared other flame retardants.
Hazard Assessment of Explosion in Suspended Dust of Wood
Lee, Keun Won ; Lee, Su-Hee ; Han, Ou-Sup ;
Journal of the Korean Institute of Gas, volume 17, issue 5, 2013, Pages 81~86
DOI : 10.7842/kigas.2013.17.5.81
Accidents of dust explosion has been occurred in various industries as a plastics, pharmaceuticals, timber, grain storage, solid fuels and chemicals. In this study, the silo dust, hammer mill dust and Nyusong dust in the manufacturing process of the particle board to utilize west wood, which were selected for this experiment and were evaluated the characteristics of dust explosion. The explosion characteristics such as a maximum explosion pressure, explosion index, lower explosive limit, and minimum ignition energy in suspended dust of the wood by Siwek 20 L apparatus were measured and evaluated for the experiment. The results of this study can be used the process safety measures to prevent accidents of fire and explosion in the suspended dust of wood.