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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
Editor in Chief :
Volume & Issues
Volume 11, Issue 4 - Dec 2007
Volume 11, Issue 3 - Sep 2007
Volume 11, Issue 2 - Jun 2007
Volume 11, Issue 1 - Mar 2007
Selecting the target year
Surface Roughness Effects of a Valve Stem on the Leakage Characteristics in LPG Automotive
Kim, Chung-Kyun ; Lee, Il-Kwon ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 1~6
This paper provides the effects on the leakage characteristics of the surface roughness of a valve stem in LPG automotive. The valve stem seal is to stop an oil leakage through a sealing gap between a valve stem and a valve stem seal. The sealing performance of two components is related to a leak safety and a long life of a valve stem and a valve stem seal. The experimental results show that the optimal surface roughness of a valve stem is to recommend as
in a centerline average roughness, Ra and a uniformly distributed profile of the roughness. Basically the smooth surface and uniform profiles of the roughness may reduce an oil leakage between a valve stem and a valve stem seal.
A Study on Fire and Explosion Accident Cause in Regenerated Thermal Oxidizer
Lee, Keun-Won ; Ma, Byung-Chol ; Hwang, Soon-Yong ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 7~11
There has been a report of fire and explosion accident in regenerated thermal oxidizer (RTO). This paper was to investigate accident causes of RTO in the resin re-treatment process. The experiments carried out physicochemical properties and thermal stability analyses by using flash point tester, flammable range apparatus, autoignition tester, GC/MSD and thermal screening unit. We inferred causes of fire and explosion from the regenerated thermal oxidizer to prevent an accident of its process.
A Study on Performance Characteristics for a CNG Regulators of Automotive Vehicle
Kim, Chang-Gi ; Park, Cheol-Woong ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 12~16
The fuel pressure regulator mounted on CNG vehicles is used to maintain a constant pressure in the fuel injection system. It needs precise fuel pressure control to obtain benefits of high efficiency and low emissions in CNG vehicles. In this study, a high pressure test rig for the performance evaluation of CNG regulators was introduced. Two different CNG regulators were tested and compared each other at various test conditions. Results showed that dynamic response and creep characteristics are directly effected by the valve assembly design. Gas temperature was dramatically dropped at hish supply pressure conditions, so that effective design for coolant bowl is needed to prevent icing problem.
NOx Formation Characteristics with Oxygen Enrichment in Nonpremixed Counterflow Flames
Lee, Chang-Eon ; Hwang, Cheol-Hong ; Yoo, Byung-Hun ; Han, Ji-Woong ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 17~22
The NOx emission characteristics with oxygen enrichment in non-premixed counterflow flames were investigated numerically. To consider systematically the situation of inevitable
contamination by air infiltration in the process of pure-oxygen combustion, the volume ratio of
in an oxidizer was changed from 21% to 100%. As a result the NO emission index
has the highest value under condition of 75% oxygen enrichment. This result can be explained by the change of
destruction rate with oxygen enrichment rather than flame temperature, flame thickness and residence time. In particular, it was found that the reaction of N+NO=
has the largest contribution on NOx production in oxygen-enrichment flames.
Quantitative Risk Assessment of the Chemical Facilities by KS-RBI Program
Kim, Tae-Ok ; Lee, Hern-Chang ; Choi, Sung-Kyu ; Jo, Ji-Hoon ; Ham, Byeong-Ho ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 23~28
Damage ranges of accidents of the chemical facilities were estimated by the KS-RBI(Ver.3.0) program supporting the quantitative cause analysis, and the consequences were compared with the results of K-CARM(Ver2.0) program which assesses the quantitative risk in an usual method. As a result we found that the consequences of the KS-RBI program were similar to those of the K-CARM program. Therefore, the KS-RBI program could be applied to the quantitative risk assessment. In addition, it can be safely said that through appling the damage ranges of accidents by weighted average, industrial sites can come up with the effective plans of mitigation and emergency.
A Study on the Performance Characteristics of a Fuel Pump in LPG Engine
Park, Cheol-Woong ; Kim, Chang-Up ; Choi, Kyo-Nam ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 29~34
In recent years, the need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as LPG(Liquefied Petroleum Gas) which is able to meet the limits of better emission levels without many modifications to current engine design. LPG has a hish vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels. These different fuel characteristics make it difficult to directly apply the conventional gasoline or diesel fuel pump. In this study, experiments are performed to get performance and efficiency of the fuel pump under different condition of the temperature, rotating speeds, and composition of fuel. The characteristics of fuel pump were affected by cavitation occurred from the variation of temperature and composition.
Evaporation Heat Transfer Characteristics of Propane and Iso-butane in Micro-fin Tubes
Son, Chang-Hyo ; Roh, Geon-Sang ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 35~40
In this paper, evaporation heat transfer characteristics of propane and iso-butane in micro-fin tubes were investigated experimentally. Test section has a micro-fin tube with outside diameter of 12.70 mm, and 75 fins with a fin heights of 0.25 mm. The experimental results summarize as the followings: The average evaporation heat transfer coefficients of He's refrigerants is higher than those of HCFC22, and appeared in the order of iso-butane, propane with respect to the approaching of the high mass flux. The evaporation heat transfer coefficient of micro fin tube is about
higher than those of smooth tube. This results from the study can be used in the case of designing heat transfer exchanger using hydrocarbons as the refrigerant for the air-conditioning systems.
A CFD Study on Unsteady and Steady State of the Hydrogen Leakage for Residential Fuel Cell System
Chung, Tae-Yong ; Ahn, Jae-Uk ; Nam, Jin-Hyun ; Shin, Dong-Hoon ; Kim, Young-Gyu ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 41~46
The residential fuel cell system was modeled as a box-shaped chamber with vent openings, filled with various components such as reformer, desulfurizer, fuel cell stack and humidifier. When the vent openings are 1% of the total surface and hydrogen leakage 1%, hydrogen concentration is around 0.1% higher than the other regions from leak points in the chamber at 30 seconds and hydrogen concentration is increased from 0.3% to 0.7% in the upper region of the system after 200 seconds. When the vent openings are 1% of the total surface and hydrogen leakage 1%, 3%, 5%, the steady state result of CFD, 5% of hydrogen leakage is reached the lowest ignition limit in the system. When the vent openings are 2% of the total surface and hydrogen leakage 1%, hydrogen concentration is increased in the bottom of the system for 60 seconds. After 250 seconds, hydrogen concentration is reached the steady state in the system. As the vent opening of the total surface increased from 1% to 2%, averaged hydrogen mole fraction is under 1% in the system, however, upper regions of the system from the hydrogen leakage points are shown over 1% of hydrogen mole fraction.
Leak and Leak Point Prediction by Detecting Negative Pressure Wave in High Pressure Piping System
Ha, Tae-Woong ; Ha, Jong-Man ; Kim, Dong-Hyuk ; Kim, Young-Nam ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 47~53
The safe operation of high pressure pipe line systems is of significant importance. Leaks due to faulty operation from the pipelines can lead to considerable product losses and to exposure of community to dangerous gases. There are several leak detection methods, which have been recently suggested on pipeline network. The negative pressure wave detection technology, which has advantages of short time detection availability, accurate leaking location estimate capability and cost effective, is concentrated in this study. Theoretical analysis of the flow characteristics for leaking through a hole on the pipe wall has been performed by using CFD++, commercial CFD package. The results of 3-dimensional analysis near leaking hole confirm the occurrence of negative pressure wave and verify the characteristics of propagation of the wave which travels with speed equal to the speed of sound in the pipeline contents. For the application of long pipe line system. The method of 1-dimensional analysis has been suggested and verified with results of CFD++.
Characteristics of Electronically Controlled 13L LNG-Diesel Dual Fuel Engine
Lee, Seok-Hwan ; Lee, Jin-Wook ; Heo, Seong-Joon ; Yoon, Sung-Shik ; Roh, Yun-Hyun ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 54~58
The trailers with electronically controlled diesel engine was converted to dual fuel engine system. To estimate economical efficiency, test vehicles have been operated on a certain driving route repeatedly. Fuel economy, mximum driving distance per refueling and driveability are examined on the road including a free way. Developed vehicle can be operated over 500 km with dual Hel and shows 85% of diesel substitution ratio. Driveability is similar with but passing acceleration. It will be improved by calibration process. Test engine was set up for investigating power output, thermal efficiency and emission. ND 13-mode tests were performed for the test cycle. The emission result of dual fuel meets K2006 regulation and the engine performance of dual fuel engine was equivalent to the performance of diesel engine.
A Study on Optimum Pressure Vent of Experimental Booth by Gas Explosion
Leem, Sa-Hwan ; Lee, Jong-Rark ; Huh, Yong-Jeong ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 59~63
The purpose of this paper is to find optimum vent port of the booth for gas explosion experiment. Also, it is to understand the safety of the booth for explosion experiment which is installed to let the trainees for legal education which is managed by IGTT(Institute of gas technology training) blow the riskiness of explosion. Since the booth for gas explosion experiment is a confined space, we used the exhaust model for indoor explosion. As the result, it was safety calculated when the amount of leaking gas was close to the maximum of explosion limit on the explosion experiment.
Characteristics of Corrosion Damages in Bottom Plate of Above Ground Tank by Acoustic Emission Signal
Kim, Sung-Dai ; Jung, Woo-Gwang ; Lee, Jong-O ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 64~72
Under the AE methods, the valid condition analysis and evaluation the leak etc, resulted by the AE signal pattern on the bottom plate of ground tank at full. In next more, the gradient of accumulation amplitude distribution analysis and comparison the energy, count, and duration time that noise of EMI signal were removed. EMI signal showed height-energy, count, and duration time, it also appeared great gradient of accumulation distribution. Then, with the pure remaining AE signals cluster analysis and location. It would possibly assume of damage with corrosion. Total cluster 20 and energy showed between the maximum 11,990 and 8,565 which is much lower than above figure and event number showed from 8 to 5. Even when it difficult to certify damage by open, as it is raised higher height-sensitivity and threshold by 60 dB. It would possibly presume of location source more accurately.
The Estimation of Lower Flash Point for n-Pentanol+n-Propionic Acid and n-Pentanol+n-Butyric Acid Systems Using Optimization Method
Ha, Dong-Myeong ; Lee, Sung-Jin ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 73~78
The lower flash points for the n-pentanol+n-propionic acid and n-pentanol+n-butyric acid systems, in air at atmospheric pressure, were measured by using Pensky-Martens closed cup apparatus. The experimental data were compared with the values calculated by the Raoult's law and optimization method. The calculated values based on the optimization method were found to be better than those based on the Raoult's law.
FE Analysis on the Screwed Safety of a Valve for a LPG Bombe
Kim, Chung-Kyun ; Oh, Kyong-Seok ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 79~84
In this paper, the finite element analysis of a valve screw for a LPG cylinder has been presented on the leakage safety and strength one, which are computed and investigated by a contact normal stress and von Mises stress between a female screw of a valve and a male screw of a neck ring in a LPG bombe. The LP gas charging pressure of a LPG bombe is
, which is pressurized to the screw sealing contact areas between a valve and a LP gas cylinder. The peak failures of the screw tooth height due to a scratch wear and chipping loss of the contact area may decrease screw tooth strength and increase a leakage of a LP gas. These are strongly affect to the contact normal and von Mises stresses of the valve screws. The FEM computed results show that the tooth height loss due to a wear and chipping failure of the screw peak does not affect to the LP gas leak and strength of a valve screw theoretically. But if the tooth wear of the screw height of a brass valve overpasses the critical strength safety of the valve, the valve screw may be failed in fastening the valve and a LP gas bombe suddenly.
FE Analysis on the Strength Safety of a Full Containment LNG Storage Tank System with Damping Safety Structures
Kim, Chung-Kyun ; Kim, Tae-Hwan ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 85~90
This paper presents the finite element analysis on the strength safety of a full containment LNG storage tank system with damping safety structures. For the FEM analysis of the inner tank, the combined loads in which are related to a hydrostatic pressure, a cryogenic temperature load, BOG pressure, LNG weight, and a sinking force at the comer of the inner tank have been applied to the inner tank structure. The FEM computed results show that the conventional inner tank is safe for the given combined loads, but the damping safety structure such as compressive springs may be more useful structures to increase the safety of the tank system. The increased stiffness and the appropriate position of the springs are very important design parameters for increasing the damping strength safety of the tank system.
An Experimental Study on Performance of Heatproof Silicon at the Connector of Boiler Exhaust Tube
Leem, Sa-Hwan ; Lee, Jong-Rark ; Kim, Cheol-Jin ; Han, Gwi-Ho ; Kim, Yong-Joo ; Kim, Hee-Soo ; Jang, Won-Suk ; Lim, Cheong-Hwan ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 91~97
Recently, during the past five years, accidents of gas boiler using city gas have occurred 7.4 times more than those which use LP gas. The number of accidents has increased since the use of city gas boilers has increased. These boiler accidents resulted in 87% death from poisoning of CO, and casualty of the accidents was 4.3 times more than that of other types of accident. Hence this study makes the cause of accidents clear by separation the exhaust tube which is the cause of CO poisoning. Also, this study will establish the safety of heat-resistant silicon through testing the performance of heat-resistant silicon. The experiment showed that common silicon started hardening at
while the heat-resistant silicon did not begin carbonization until
. Besides at the temperature of
which is the normal temperature of exhaust tube, common silicon leaked on the pneumatic test after deterioration, but the heat-resistant silicon maintained its original property. With these results, we judge that we can reduce the casualty by CO poisoning if we use the heat-resistant silicon to the connector of he exhaust tube.
Likelihood Estimation of Release Incidents in Chlorine
Baek, Jong-Bae ;
Journal of the Korean Institute of Gas, volume 11, issue 4, 2007, Pages 98~103
Likelihood analysis was used for the revision of release probability/frequency in chlorine Injection facilities used in chlorine process. Typically these facilities consist of pressure cylinder, vaporizer, pipeline, measuring equipment and safety equipment. This paper described the incident scenarios considered, likelihood analysis procedure and the selection and application of basic events and for failure rates of mechanical components. Human errors were also considered. The major objective of this paper is to estimate the likelihood of each determined incident scenarios. We estimated failure rates of mechanical components based on likelihood analysis procedure. Human errors were also considered. It was estimated to have
leak per year during the major
handling process. The probability of failure in scrubber system was