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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 2, Issue 4 - Dec 1998
Volume 2, Issue 3 - Sep 1998
Volume 2, Issue 2 - Jun 1998
Volume 2, Issue 1 - Mar 1998
Selecting the target year
Development of Integrated Design System for High Temperature, High Pressure Parts for Chemical Plants
Jeong Dong Gwan ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 1~6
In order to increase design efficiency, it is required to design steam boiler pressure parts systematically considering daily start-stop operation and load variation. The objective of this research is to develope an integrated system for increasing design efficiency of boiler pressure parts. The developed system consists of three program modules: (1) flexibility design module for the header stub considering fatigue life, (2) fatigue limit calculation and life evaluation module for the thick-walled boiler pressure part under cyclic operation using TRD301 code, (3) drawing automation module for the header and drum producing design drawings, welding data and bill of materials.
Consequence Modeling Methodology for Prediction of Hazard Distance for Two-phase Flow Release from the Pressurized Chlorine Saturated Liquid Storage Tank
Song D. M. ; Park Y. S. ; Park J. K. ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 7~17
This study is to develop the consequence modeling methodology for quantitative prediction of the hazard distance(or toxic buffer distance) for two-phase flow continuous releases from the pressurized chlorine saturated liquid storage tank of the chemical plant facilities. The source term modeling was peformed by the refined analysis method based on USEPA's guideline and SuperChems model self-calculation, respectively. The hazard distance was predicted for STEL, IDLH and ERPGs(ERPG-2 and ERPG-3) concentrations being used as the toxic regultaion concentration in hazard estimation. To use as hazard estimation guideline for the establishment of the emergency response planning, the effects of source characteristics and meteorological vaiations on the hazard distance was especially considered for ERPG-2 concentration.
Studies of Annealing Effect on the Properties of the Rigid Polyurethane
Kang S. J. ; Jung H. C. ; Kim W. N. ; Lee Y. B. ; Choe K. H. ; Hong S. H. ; Kim S. B. ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 18~24
Polyurethane (PU) synthesized from 4,4'-diphenylmethane diisocyanate having high functionality (f=2.9) and polyester polyol have been investigated by differential scanning calorimeter (DSC), dynamic mechanical thermal analyzer (DMTA), and Fourier transform infrared spectroscope (FT-IR). From the DSC measurement of polyurethane, a single transition temperature (
) was observed. This result indicates that polyurethanes synthesized in this work have homogeneous network structure due to high functionality of diisocyanate. It was also found that the
of polyurethane was increased as hard segment content was increased. The results from DMTA measurement are consistent with DSC results. In order to investigate the effect of thermal annealing on the
of polyurethane, the samples were annealed at various annealing conditions.
of polyurethanes were found to increased with annealing temperature. From swelling experiment and FT-IR studies, it was found that the
was increased as crosslinking density of polyurethane was increased.
Characteristics of Evaporation Heat Transfer in a Small-Scale Cryogenic Heat Exchange System for the Utilization of LNG Cold Energy
Nam S. C. ; Lee S. C. ; Lee Y. W. ; Sohn Y. S. ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 25~33
The characteristics of evaporation heat transfer for the utilization of LNG cold energy was investigated experimentally using liquified nitrogen and a solution of ethylene-glycol and water under horizontal two-phase conditions in the small-scale equipment of a cryogenic heat exchange system. The inner tubes in the double pipe heat exchanger with 8 mm and 15 mm inner diameter and 6 m length were adopted as a smooth test tubes and enhanced tubes by means of wire-coil inserts. Heat transfer coefficients and Nusselt number for the test tube were calculated from measurements of temperatures, flowrates and pressures. The correlations in a power-law relationship of the Nusselt number, the Reynolds number and Prandtl number for heat transfer were proposed which can be available for design of cryogenic heat exchangers. The correlations showed heat transfer coefficients for the wire-coil inserts were much higher than those for the smooth tubes, increased by more than 2.5
5.5 times depending upon the equivalent Reynolds number. Form and length of cryogenic double pipe heat exchanger were proposed for applicable to the utilization of LNG cold energy.
Evaluation on Corrosion Behaviour and Adhensivity of Oxide Coated Materials
Lee Jong-Rark ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 34~41
To oxide film,
, coated on stainless steel (SUS410, SUS304) and pure Fe using RF magnetron sputtering method, the corrosion resistance on oxide coatings was studied using electrochemical measurement. Also, the adherence between film and substarte was studied. The adherence index (
) was determined by the measure of micro hardness test. In this paper, we know that oxide film coated on SUS304 have better corrosion resistance than that coated on SUS410. In oxide film, the difference of corrosion resistance due to crystal structure have not been showed. In evaluating defect area rate of ceramic coated materials, CPCD method can be used effectively. In the micro-hardness test, with
thickness film, it has only one the value of
thickness film, however, get another value of
as the cracks in film. The oxide film adhere well on the mild materials such as pure steel than high intensity materials like stainless.
Transition Temperature Evaluation of 1Cr-1Mo-0.25V Steel Using Miniaturized Charpy Impact Specimen
Nahm Seung Hoon ; Kim Si Cheon ; Lee Hae Moo ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 42~46
Miniaturized specimen technology Permits mechanical behavior to be determined using a minimum volume of material. The technology is useful in case of not collecting a large amount of materials from industrial equipments. Five kinds of accelerated degradation materials were prepared by isothermal aging heat treatment at
. Three kinds of specimens were prepared for impact testing. In order to increase plastic constraint of subsize specimen, side-groove was introduced. Results between subsize and full size impact testing were compared. Size effects correlations were developed for the impact properties of turbine rotor material. These correlations successfully predict the ductile brittle transition temperature (DBTT) of full size Charpy impact specimens based on subsize specimen data.
A experimental study of water vapor absorption characteristics using four components solution for gas fired absorption chiller
Lee Yong-Won ; Oh Young-Sam ; Park Dal-Ryung ; Baek Young-Soon ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 47~52
Water vapor absorption performance of four components solution (
) which could be substituted for commonly used
solution in water cooled abosorption chiller is tested using a vertical tube absorber. Inlet solution concentration, inlet solution temperature, solution flow rate and inlet temperature of cooling water is varied as experimental parameters. The results of the experiment of water vapor absorption performance show that four components solution should have
higher concentration for equal absorption capacity of
. But considering that four components solution have higher solubility than LiBr solution about
high oncentration, four components solution (
) have more absorption capacity than LiBr solution in actual absorption chiller and can be applied to a small or air cooled absorption chiller.
The Characteristics of Two Phase Flow by Non-Newtonian Fluid for Vertical Up-ward in a Tube
Cha K.O. ; Kim J. G. ; Che K.S. ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 53~59
Flow pattern of air-water two phase flow depends on the conditions of pressure drop, void fraction, and channel geometry. Drag reduction in the two phase flow can be applied to the transport of crude oil, phase change systems such as chemical reactor, pool and boiling flow, and to present cavitation which occurs in pump impellers. But the research on drag reduction in two phase flow is not intensively investigated. Therefore, experimental investigations have been carried out to analyze the drag reduction produced and void fraction by Co-polymer(A611p) addition in the two phase flow system. We find that the maximum point position of local void friction moves from the wall of the pipe to the center of the pipe when polymer concentration increases. Also we find that the polymer solution changes the characteristics of the two phase flow. And then we predict that it is closely related with the drag reduction.
Modeling of heat efficiency of hot stove based on neural network using feature extraction
Min Kwang Gi ; Choi Tae Hwa ; Han Chong Hun ; Chang Kun Soo ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 60~66
The hot stove system is a process that is continuously and constantly generating the hot combustion air required for the blast furnace. The hot stove process is considered as a main energy consumption process because it consumes about
of the total energy in steel making works. So, many researchers have interested in the improvement of the heat efficiency of the hot stove to reduce the energy consumption. But they have difficulties in improving the heat efficiency of the hot stove because there is no precise information on heat transformation occurring during the heating period. In order to model the relationship between the operating conditions and heat efficiencies, we propose a neural network using feature extraction as one of experimental modeling methods. In order to show the performance of the model, we compare it with Partial Least Square (PLS) method. Both methods have similarities in using the dimension reduction technique. And then we present the simulation results on the prediction of the heat efficiency of the hot stove.
A Evaluation of Corrosion Resistance on the Thermal Sprayed Coating Tube and Cladded Tube of the Open Rack Vaporizer
Baek Jong-Hyun ; Lee Jae-Ho ; Kim Yong-Seog ; Shin Dong-Hyuck ; Kim Woo-Sik ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 67~72
Due to excellent corrosion resistance, in particular against sea water, Al-2wt.
Zn alloys have been used as the sacrifice anode material for tube of the ORV. Al-2wt.
Zn alloys thermal-sprayed coating, however, were spalled on the lower part of ORV due to the lack of bonding strength between base material and coating layer and the dropping energy of sea water, To overcome the problems of the thermal spray coating, we developed the cladded tube manufacturing process by coextrusion of the clad and base metal. The corrosion resistance of cladded tube was improved by two times at least, compared with that of the present thermal spray coated vaporizer tubes.
Modified Pseudosteady-State Approach to Calculate Long-Time Performance of Closed Gas Reservoirs
Lee Kun Sang ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 73~78
This paper considers the applicability of a pseudosteady-state approach to the long-time behavior of real gas flow in a closed reservoir. The method involves a combination of a linearized gas diffusivity equation using a normalized pseudotime and a material balance equation. For the simulation of field-scale problems with multiple wells of differing production rates over extended production periods, the pseudosteady-state equation was solved successively for each flow period. Results from this study show that the approach provides a fast and accurate method for modeling the long-time behavior of gas reservoirs under depletion conditions.
A Study on the Minimum Ignition Limit Voltages for LPG-Air Mixtures by Discharge Sparks in Radio-frequency Circuits
Lee Chun-ha ; Kim Jae-ouk ; Jee Sung-ouk ; Song Hun-jik ; Lee Gang-sik ; Lee Dong-in ;
Journal of the Korean Institute of Gas, volume 2, issue 4, 1998, Pages 79~84
This paper describes the minimum ignition limit voltages for LPG-Air 5.25[Vol
] mixture gas by discharge sparks in radio-frequency limits using RF power supply and IEC type ignition spark apparatus. As a result, the minimum ignition limit voltages is increased in proportional to the rate of increasing of frequency in LPG-Air mixture gas. Especially, the minimum ignition limit voltages increase remarkably between 3[KHz] and 10[KHz]. It is considered that ignition is caused by one discharge until 3[KHz] and, beyond 3[KHz] ignitiof is caused by more than two discharges. The reason is analyzed that energy loss is caused by existing pause interval between discharges. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof RF machines which are applied tole-equipments and detectors used in dangerous areas but also for datum for its equipment tests.