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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 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
Selecting the target year
Performance and Emission Characteristics of GHP Engine at Different Natural Gas Heating Value
Lee, Joongseong ; You, Hyunseok ; Choi, Jeonghwan ; Choi, Euikwang ; Lee, Kyungho ; Lee, Byungdae ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 1~5
DOI : 10.7842/kigas.2015.19.1.1
In general, natural gas is used as GHP(Gas Engine Driven Heat Pump) fuel. On this study, the influences of different natural gas heating value on GHP were evaluated. As a result of engine test & field test using low heating value gas(
) as fuel, the engine power was reduced slightly, however the performance of start-up, the stability of operation and the characteristics of emission gas were almost similar. So it is considered that the normal operation of GHP is possible without any tuning when the low heating value(
) of natural gas was used as fuel.
Failure Examples Study Including with timing belt, Constant Velocity Boot and Weather strip on a Car
Lee, Il Kwon ; Lee, Jong Ho ; Hwang, Han Sub ; Yim, Ha Young ; You, Chang Bae ; Kim, Young Kyu ; Kim, Choo Ha ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 6~11
DOI : 10.7842/kigas.2015.19.1.6
This paper is to study the examples for rubber damage and weaken reliability of timing belt, constant velocity joint boot and weather strip in vehicle. The first example, when the service man replaced the new timing-belt of rubber material, he assembled the belt that was weaken it's contact surface because of material transform. He knew the abnormally tearing failure by friction action between belt and sprocket. The second example, it certified the fact that the grease is leaked out boot protecting of constant velocity joint by split of rubber surface because of durability badness. The third example, the weather stripe took the minutely tearing because of damage produced the material transform by crack of chemistry change. It certified the production phenomenon of a tiny noise by coming with outside air because of overlapped the rubber of weather stripe when driving after closing the door. Therefore, the driver must always manage the rubber system part of vehicle.
A Study on the Quantitative Measurement of Oil Carry-over in Natural Gas Vehicle fueling Station Using A Gravimetric Method
Hwang, Sung-Soo ; Oh, Jun-Seok ; Kim, Ki-Dong ; Oh, Young-Sam ; Choi, Kyung-Sik ; Kim, Hack-Eun ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 12~17
DOI : 10.7842/kigas.2015.19.1.12
The core of the CNG fueling station is the compressor and most of CNG compressors in Korea require lubrication. Lubrication oil of CNG compressor that can be transferred into the pressure regulators and the engines of fueling system can cause a negative effect on NGV(Nature Gas Vehicle) performance during refueling due to oil Carry-over. In order to avoid the problem, it is necessary to enhance the quality of the compressed natural gas by measuring quantitatively the amount of the transferred oil. In this research, a sampling device and sampling tube were developed, which can be used with a gravimetric method of detection to measure CNG oil Carry-over. In addition, CNG samples were taken at 6 pre-selected CNG fueling stations and analysed for their trace oil Carry-over. The measured total oil Carry-over ranged from 2.569 to 6.509 ppm. This test measurements were compared with those of previous studies to verify the results.
Effects of Corner Radius on the Stress Strength Safety of LPG Steel Cylinder
Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 18~22
DOI : 10.7842/kigas.2015.19.1.18
This paper presents the stress strength safety of LPG steel cylinder for various corner radiuses of upper round end plate and lower round end plate by using a finite element method. The FEM analyzed results indicate that the most influential elements is a corner radius of upper round end plate and lower round end plate rather than a thickness of LPG cylinder. But, the thickness of a steel cylinder is an important design element considering for a weight reduction of a cylinder. Thus, this paper recommends that the LPG steel cylinder thickness is 2.3~2.6mm and the corner radius of upper round end plate and lower round end plate is over 157mm as an optimum design for the maximum testing pressure of 3.04MPa.
Finite Element Analysis of Stress and Deformation Behaviors in Cylindrical Hollow Rollers
Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 23~27
DOI : 10.7842/kigas.2015.19.1.23
The stress and deformation behavior safeties of cylindrical hollow rollers have been analyzed by the finite element method, and investigated for over design capability based on the computed results. According to the stress analysis result which is related to the strength of a hollow roller, the maximum stress of 39.8MPa in which is operated near the bearing for supporting a hollow roller structure is overestimated design as 15.9% level compared with a yield strength, 250MPa of a steel material. And the maximum deformation of 0.032mm in which is operated at the middle span of a total length of cylindrical hollow rollers is very small and sufficiently safe compared with a total length and a thickness of a hollow roller. Thus, the FEM computed results for a stress and deformation indicate that a current FEM analysis model of cylindrical hollow rollers is over designed.
Development of Well Placement Optimization Model using Artificial Neural Network and Simulated Annealing
Kwak, Tae-Sung ; Jung, Ji-Hun ; Han, Dong-Kwon ; Kwon, Sun-Il ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 28~37
DOI : 10.7842/kigas.2015.19.1.28
This study presents the development of a well placement optimization model, combining an artificial neural network, which enables high-speed calculation, with a simulated annealing algorithm. The conventional FDM simulator takes excessive time when used to perform a field scale reservoir simulation. In order to solve this problem, an artificial neural network was applied to the model to allow the simulation to be executed within a short time. Also by using the given result, the optimization method, SA algorithm, was implemented to automatically select the optimal location without taking any subjective experiences into consideration. By comparing the result of the developed model with the eclipse simulator, it was found that the prediction performance of the developed model has become favorable, and the speed of calculation performance has also been improved. Especially, the optimum value was estimated by performing a sensitivity analysis for the cooling rate and the initial temperature, which is the control parameter of SA algorithm. From this result, it was verified that the calculation performance has been improved, as well. Lastly, an optimization for the well placement was performed using the model, and it concluded the optimized place for the well by selecting regions with great productivity.
A Comparative Study on the Toxicity Evaluation for Fire Smoke by FDS
Jeong, Beom Jin ; Lee, Keun Won ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 38~44
DOI : 10.7842/kigas.2015.19.1.38
FDS (Fire Dynamics Simulator) is the most widely used computational fluid dynamics software in the fire safety engineering community, and it is applicable to various evaluations of fire growth and its effects. This study made use of a range of outputs from FDS simulation to predict FED (Fractional Effective Concentration) and FEC (Fractional Effective Concentration) levels which are often adopted to evaluate toxicity of fire smoke. As it is not possible to calculate these values directly from outputs of FDS, it was necessary to produce them by means of additional calculation procedures incorporating results of evacuation simulation. In this study, the latest version of FDS, which was recently updated in November 2013, was utilized for the purpose of quantitative comparison with the old version of FDS. As a result, it was found that they make about 10 percent difference on average in predicting FED and FEC levels for the cable fire case study.
A Study on the Importance of Safety Measurement Based on the Analysis of the Factors Leading to Serious Accidents Related to Chemical Industries
An, Hyung Hwan ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 45~50
DOI : 10.7842/kigas.2015.19.1.45
This study is an analysis of characteristics and the causes of serious accidents in chemical industry. The statistical analysis was focused on preventive facilities, equipment failures, accident materials and instabilities of workers and employment type. First, it showed that the highest number of the victims of accidents were involved in the industry of chemical materials and chemical products among the investigation of the manufactural industries. Also, particularly, they were investigated to be focused on the occurrence of the serious accidents in preventive facilities. Secondly, the most of the victims of serious accidents were found out not to be temporary or part-time worker but regular workers and most of the accidents occur in the form of big accidents involving more than 4 workers.
Assessment of Dispersion Coefficients and Downward Positions of Water Spray for Small-Scale Release of Chlorine Gas
Jang, Seo-Il ; Kim, Youngran ; Yu, Wooyun ; Shin, Dongil ; Park, Kyoshik ; Kim, Tae-Ok ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 51~56
DOI : 10.7842/kigas.2015.19.1.51
To assess downward positions of water spray for the small-scale release of chlorine gas, dispersion coefficients for the Gaussian dispersion model were validated at the small-scale release experiment. And the downwind distances of water spray were assessed with the simulated results. As results, the Gaussian plume model using the Briggs' dispersion coefficient well estimated the dispersed characteristics for small-scale release of chlorine gas. The best adequate downwind position of water spray is the position of the maximum concentration of chlorine at the ground level. And the adequate vertical and horizontal dimensions of water spray consider the maximum width and height of cloud.
Hydrogen Embrittlement of TRIP Steel Charged with Hydrogen Under Two Type Electrolytes
Choi, Jong-Un ; Lee, Sang-Wook ; Lee, Kyung-Min ; Kang, Kae-Myung ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 57~63
DOI : 10.7842/kigas.2015.19.1.57
The hydrogen was charged TRIP steel by electrochemical method under 0.5M
electrolyte and 0.5M NaOH electrolyte with hydrogen charging conditions respectively. The degree of hydrogen embrittlement of TRIP steel was evaluated by using micro Vickers hardness tests. These results showed that the degree of hydrogen embrittlement in acidic electrolyte with hydrogen penetration and hydrogen diffusion through the depth of specimen was more sensitive than its alkaine electrolyte between two type electrolytes. However, it was investigated that micro Vickers hardnesses of surface in acidic electrolyte under two electrolyte were higher than those of alkaine electrolyte. It was thought that in case of hydrogen embrittlement in acid-ice electrolyte, hydrogen charging time was more effective than current density, in case of alkaine electrolyte, hydrogen current density was more effective than charaging time.
Small Punch Test of TRIP Steel Charged with Hydrogen under Different Electrolyte Condition
Kim, Kwang-Sig ; Yoo, Kwang-Hyun ; Park, Jae-Woo ; Kang, Kae-Myung ;
Journal of the Korean Institute of Gas, volume 19, issue 1, 2015, Pages 64~70
DOI : 10.7842/kigas.2015.19.1.64
In order to evaluate the degree of hydrogen embrittlement of TRIP steels charged with hydrogen according to varying the current density and the charging time under acid and alkaline electrolyte conditions were tested by small punch test. The results of SP test showed that the degree of hydrogen embrittlement at acid electrolyte condition was more effective factor compared to that of alkaline electrolyte condition. Therefore, all of the charging time and the charging current density were at the condition of acid electrolyte appeared as the main factor of the degree of hydrogen embrittlement in the condition of acid electrolyte. But, it was considered that the charging time compared to the charging current density at the condition of alkaline electrolyte was more effective factor to raise the degree of hydrogen embrittlement.