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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
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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
Design and Analysis for Hydrogen Liquefaction Process Using LNG Cold Energy
Yun, Sang-Kook ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 1~5
DOI : 10.7842/kigas.2011.15.3.001
For the hydrogen liquefaction, the large amount of energy is consumed, because precooling, liquefaction and ortho/para conversion heats should be eliminated. In this paper the basic design and thermal analysis are carried out to reduce the energy consumption by using LNG cold energy for precooling process in hydrogen liquefaction processes. The LNG cold energy utilization for hydrogen precooling enables not only to get energy saving for liquefaction, but to recover the wasted cold energy to sea water at the LNG terminal. The results show that the energy saving rate for liquefaction using LNG cold energy is almost 75% of current industrial hydrogen liquefaction plant. The demand flow-rate of LNG is only 15T/D for 1T/D hydrogen liquefaction.
Flame Propagations of Gasoline-Air Mixtures by Electrostatic Discharge Energies
Park, Dal-Jae ; Kim, Nam-Il ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 6~10
DOI : 10.7842/kigas.2011.15.3.006
Experimental studies were carried out to investigate the effects on flame propagation of gasoline-air mixtures by different electrostatic discharge energies in a cylindrical chamber. Three different ignition energies were used: 1 mJ, 50 mJ and 98 mJ. In this work, a high-speed particle image velocimetry technique was applied to visualize the flow-field around ignition electrodes. It was found that as the ignition energy increased, the ignition kernel was different. The different ignition kernel caused different flame initiation. During the flame initiation, the higher ignition energy was applied, the higher flame speed was observed. However, with increasing time, the flame speeds were independent of the ignition energies used. Theses observed flame behaviors were similar to computational simulations shown in the literature. It was also found that as the ignition energies increased, the velocities of unburnt mixtures ahead of propagating flame fronts increased.
Investigation of CT Imaging Technique Using Guided Wave
Yoon, Hyun-Woo ; Kang, To ; Kim, Hak-Joon ; Song, Sung-Jin ; Shin, Ho-Sang ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 11~18
DOI : 10.7842/kigas.2011.15.3.011
Ultrasonic guided waves have been widely utilized for long range inspection of structures. Recently, many researchers have paid attention to the tomographic imaging using guided wave for the diagnosis of plate-like structures because group velocity of guided waves is changed by central frequency of transducer and thickness of plate. Currently, Delay and Sum imaging technique and MVDR(Minimum Variance Distortionless Response) imaging technique are performed. So the performance of these two imaging techniques are investigated in this paper.
Study on The Supplying effect of Gas Air Conditioning Systems
Han, J.O. ; Chae, J.M. ; Choi, K.S. ; Hong, S.H. ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 19~25
DOI : 10.7842/kigas.2011.15.3.019
Generally, the generation methods of cooling energy are electric air conditioning (EAC) and gas air conditioning (GAC). The EAC system is caused by increasing peak power during summer. Because the electric energy has a characteristic of non-storage, the peak electric load has been issued social problem annually whether the facility to supply is enough or not. Another way to supply cooling energy, GAC system is worked by gas energy. The absorption chiller and gas engine heat pump have been commercialized for cooling. However, the total capacity of GAC is much less than EAC and it almost depends on EAC for small market. This paper described the status of cooling energy consumption in domestic and expected the cooling energy to be consumed by electric and gas energy up to 2024 year. And also the benefit of GAC was analyzed with the case of its expansion and it was aimed to give background to fit the GAC policy.
A Method to Prevent CO Poisoning from Instantaneous Water Heaters
Ahan, Jeong-Jin ; Yeo, Chang-Hoon ; Jo, Young-Do ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 26~30
DOI : 10.7842/kigas.2011.15.3.026
Instantaneous water heater being not properly installed and not adequately maintained may produce fatal accidents due to carbon monoxide poisoning and suffocation. Insufficient supply of air into the gas appliance for complete burning of the fuel or blocking the outlet of the combustion gas could be a cause to increase carbon monoxide concentration in the exhaust gas of the gas appliance. In this work, the experiments are done with a collected instantaneous water heater using in domestic and the concentration of oxygen near the gas appliance and carbon monoxide in exhaust gas are observed to investigate the risk of instantaneous water heater. The concentration of oxygen near the gas appliance is reduced until 17.7% for the ratio of the ventilation area and floor area being 3.5%. If the outlet of combustion gas is blocked, the carbon monoxide concentration is steeply increasing more than 4,000ppm. Therefore, periodic checking the outlet of combustion gas is more important than vent area to reduce the risk of carbon monoxide poisoning.
Smoke Control According to the Ventilation Capacity in Subway Tunnel Fire: I. FDS Simulation
Park, Kyung-Jun ; Lee, Ki-Jun ; Hadi, Bettar El ; Lee, Jai-Hyo ; Shin, Dong-Il ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 31~38
DOI : 10.7842/kigas.2011.15.3.031
In this study, we investigate simulation studies to confirm the removal of smoke through ventilation when the subway car is on fire and stopped in an underground subway tunnel, by using Fire Dynamics Simulator (FDS) which is being upgraded by NIST. The structure of subway tunnel and train for simulation modeling are based actual data from Seoul metropolitan subway. The main purpose of this study is to assure the removal efficiency of the ventilation when changing the ventilation capacity between 2.0 m/s and 3.0 m/s. The results of the study shows that carbon monoxide (CO) and carbon dioxide (
) are reduced by about 35% as the ventilation capacity is increased by 0.5 m/s. This study also performs the grid sensitivity verification of FDS for improved accuracy of the results. To find the effective size of the grid, three cases are simulated and the results are compared.
An Investigation on the Effect of Fuel Stratification of DME/n-Butane mixture on Reduction of Pressure Rise-Rate in HCCI Combustion
Lim, Ock-Taeck ; Park, Kyu-Yeol ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 39~46
DOI : 10.7842/kigas.2011.15.3.039
This study investigates the effects of the DME and n-Butane mixture and of the stratification on combustion characteristics of HCCI engine by chemical reaction calculation. First, the existing DME reaction scheme and n-Butane is combined to make new chemical reaction model, then validating the effectiveness of new scheme. Furthermore, this study verify the HCCI combustion characteristics according to the changes of DME and n-Butane mixture ratio, which shows different auto ignition characteristics. Finally, it confirms the effects of stratification of mixture fuel on the reduction of pressure rise rate.
Study for Failure Examples of Solenoid Valve, Relay and Idle Speed Control Actuator in Liquid Petroleum Gas vehicle Engines
Kim, Chung-Kyun ; Lee, Il-Kwon ; Cho, Seung-Hyun ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 47~52
DOI : 10.7842/kigas.2011.15.3.047
The purpose of this paper analyzes and studies to seek the failure examples of electronic control actuators for engine in liquified petroleum gas vehicle. The first, it was verified phenomenon for intial starting damage and no-acceleration of engine because of occasionally fuel feeding interception by clogged of emergency cutting solenoid valve filter. The second, the contact resistance produced in the connecting part of engine control relay because of no fully surface contacting by processes and assembly badness. It was displayed phenomenon of re-starting badness. The actuator that idle speed control system was sticked inside because of intake-air decreasing by carbon deposit. As a result, it was verified the phenomenon of disharmony that repeated up and down the engine revolution.
A Numerical Analysis of Flow Characteristics in a Heat Recovery Steam Generator with the Change of Inlet Flow Conditions
Kim, Tae-Kwon ; Lee, Boo-Yoon ; Ha, Ji-Soo ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 53~57
DOI : 10.7842/kigas.2011.15.3.053
The present study has been carried out to analyze the flow characteristics of a heat recovery steam generator with the change of inlet flow conditions by using numerical flow analysis. The inlet of HRSG corresponds the outlet of gas turbine exit and the flow after gas turbine has strong swirl flow and turbulence. The inlet flow condition of HRSG should be included the exit flow characteristics of gas turbine. The present numerical analysis adopted the flow analysis result of gas turbine exit flow as a inlet flow condition of HRSG analysis. The computational flow analysis result of gas turbine exit shows that the maximum axial velocity appears near circular duct wall and the maximum turbulent kinetic energy and dissipation rate exist relatively higher gradient region of axial velocity. The comparison of flow analysis will be executed with change of inlet turbulent flow condition. The first case is using the inlet turbulent properties from the result of computational analysis of gas turbine exit flow, and the second case is using the assumed turbulent intensity with the magnitude proportional to the velocity magnitude and length scale. The computational results of flow characteristics for two cases show great difference especially in the velocity field and turbulent properties. The main conclusion of the present study is that the flow inlet condition of HRSG should be included the turbulent properties for the accurate computational result of flow analysis.
Dynamic Response of Underground Three-layered Pipeline Subjected to Pile Driving Loads : I. Distance
Kim, Moon-Kyum ; Won, Jong-Hwa ; Choi, Joung-Hyun ; Yoo, Han-Kyu ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 58~66
DOI : 10.7842/kigas.2011.15.3.058
This study presents the behavior characteristics of buried three-layered pipeline subjected to pile driving loads. The analysis considered the driving energy caused by 7 tonf of ram weight and 1.2m of stroke. Also the distance from vibration resource to pipeline varies in 5m to 30m. The vibration velocity and stress are investigated at the center of pipeline in longitudinal direction. In the same cover depth, attenuation ratio of vibration velocity and von Mises stresses for distance increment has shown a decreasing trend. The maximum stress occurs at the top and bottom for the inner pipe, however, an irregular stress distribution is found for the outer pipe.
The Effect of Hydrogen on Mechanical Properties of Gas Pipeline Material: I Tensile property
Kim, Woo-Sik ; Jang, Jae-Il ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 67~73
DOI : 10.7842/kigas.2011.15.3.067
One of the important topics to prepare the up-coming era of so-called ‘hydrogen economy’ is hydrogen transmission. Pipeline is conceivably the most economic way to consistently and safely transport a large amount of hydrogen over a long distance, which may be strongly requested in hydrogen economy era. As a good starting point for the purpose, one might wonder whether conventional API pipeline steels as designed for natural gas transmission can be used as the hydrogen pipeline materials or not. To answer the question, here we performed a series of micro-/nano-indentations together with tensile tests on the hydrogen-charged API X65, X70 and X100 steels having different strength level. In this paper, from the results of tensile tests, the hydrogen effects on the mechanical behavior in the API steels are systematically evaluated.
Study for an BF
Specialty Gas Production
Lee, Taeck-Hong ; Kim, Jae-Young ;
Journal of the Korean Institute of Gas, volume 15, issue 3, 2011, Pages 74~78
DOI : 10.7842/kigas.2011.15.3.074
gas has been used for semiconductor manufacturing process and applied in plasma etching, chemical vapor deposition, chamber cleaning processes etc,.
provides Boron and acts as a p-type doping in electrode in semiconductor. In this study, we investigate thermaldecomposition of alkali-boron complexes and suggest a simple way to produce