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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 20, Issue 2 - Apr 2016
Volume 20, Issue 1 - Feb 2016
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Combined Removal of n-heptane and CO using Plasma-catalytic Process
Lee, Sang Baek ; Jo, Jin Oh ; Mok, Young Sun ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 1~9
DOI : 10.7842/kigas.2016.20.2.1
Combined removal of n-heptane and carbon monoxide (CO) using a plasma-catalytic process was investigated. The performance of the plasma-catalytic process was compared with that of the catalyst-alone process to characterize the decomposition of n-heptane and CO with the operation parameters such as the type of catalyst, reaction temperature, and discharge power. From several sets of experiments, it was found that the decomposition efficiency of n-heptane mainly depended on the specific input energy rather than the reactor temperature, whereas the oxidation of CO on both the energy density and the reaction temperature. The results conducted over several metal oxide catalysts exhibited that the decomposition efficiency of n-heptane was in the order:
catalyst did hardly generate CO as a byproduct during the decomposition of n-heptane under an appropriate condition, revealing
selectivity of nearly 100%. The CO oxidation efficiency was largely affected by the type of catalyst (
). At temperatures below
, the plasma-catalytic process was more effective in the oxidation of CO, while above
, the catalytic process resulted in slightly higher CO oxidation efficiency.
A Study of Failure Examples for Refrigerant Gas Leakage in Automotive Air Conditioner System
Lee, Il Kwon ; Kook, Chang Ho ; Moon, Hak Hoon ; You, Chang Bae ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 10~15
DOI : 10.7842/kigas.2016.20.2.10
This paper is to analyze and study the failure examples of refrigerant gas in automotive air conditioner. The first example, the air conditioner compressor continually operated that the refrigerant was leaked in air conditioner system. By lubrication shortage, the piston was partially sticked on cylinder of air conditioner compressor inner part. This was caused the phenomenon of engine operation trouble by load increasing with engine rpm variation during engine running. The second example, it sought the fact that the air conditioner refrigerant gas was leaked from air conditioner compressor to condenser high pressure pipe toward rear air conditioner checking with the lines of air conditioner. The third example, the refrigerant gas of air conditioner found that was leaked imperceptible from condenser inner by crack that was generated on the fins of air conditioner condenser. Therefore, the air conditioner system that maintain the air conditioner by decreasing the in-car temperature must meticulously manage to not leak the air conditioner refrigerant gas.
A Study on Characteristics of Auto Ignition and Activation Energy of Ethylene Glycol and Diethylene Glycol
Kim, Jung-Hun ; Choi, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 16~22
DOI : 10.7842/kigas.2016.20.2.16
Auto ignition characteristic is an important factor for handling combustible substance and fire prevention. This research studied about auto ignition characteristic and activation energy of Ethylene Glycol (EG) and Diethylene Glycol (DEG) by using ASTM D2155 type ignition temperature measuring apparatus. As the auto ignition temperatures, it was possible to get
for EG within sample amount range of
for DEG within sample amount range of
. Also, it was possible to get
as instantaneous ignition temperatures with sample amount of
for EG and DEG respectively. By using least square method from Semenov equation on measured ignition temperature and ignition delay time from this study, it was possible to calculate activation energy of EG as 25.41 Kcal/mol and DEG as 14.07 Kcal/mol. Therefore, it was possible to claim that DEG has more risk of auto ignition since the auto ignition temperature, instantaneous ignition temperature and activation energy of DEG is lower than EG.
The Power Spectral Density Characteristics of Lift and Drag Fluctuation of Fin Tube in a Heat Recovery Steam Generator
Ha, Ji Soo ; Lee, Boo Youn ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 23~29
DOI : 10.7842/kigas.2016.20.2.23
Heat exchanger tube array in a heat recovery steam generator is exposed to the hot exhaust gas flow and it could cause the flow induced vibration, which could damage the heat exchanger tube array. It is needed for the structural safe operation of the heat exchanger to establish the characteristics of flow induced vibration in the tube array. The researches for the flow induced vibration of typical heat exchangers have been conducted by using single cicular tube or circular tube array and the nondimensional PSD(Power Spectral Density) function with the Strouhal number, fD/U, had been derived by experimental method. From the present study, the basis for the application of flow induced vibration to the heat recovery steam generator tube array would be prepared. For the previous mentioned purpose, the present CFD analysis introduced a single fin tube and calculated with the unsteady laminar flow over the single fin tube. The characteristics of vortex shedding and lift and drag fluctuation over the fin tube was investigated. The derived nondimensional lift PSD was compared with the results of the previous experimental studies and the characteristics of lift and drag PSD over a single fin tube was established from the present CFD study.
Effect of Blowing Agents on Properties of Phenolic Foam
Jang, SaeYoon ; Kim, Sangbum ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 30~34
DOI : 10.7842/kigas.2016.20.2.30
In this study, we synthesized a phenol foam using a resol-type phenol resin as a research for replacing the polyurethane foam used as an insulator for cryogenic temperature, such as LNG or LPG. Foaming agents for synthesizing a phenolic foam was used HCFC-141b or n-pentane, cyclopentane, n-hexane, cyclohexane and a mixture of HFC-365mfc and HFC-227ea respectively. Cyclohexane as a blowing agent exhibited the most superior insulating performance and compressive strength. The heat resistance of polyurethane foam and phenolic foam blown by the cyclohexane, was higher than polyurethane foam.
Worker Health Hazard and Risk Assessment of Formamide using in Workplaces in South Korea
Kim, Hyeon-Yeong ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 35~42
DOI : 10.7842/kigas.2016.20.2.35
Formamide is a colorless fluid with ammonia odor, and irritable when inhaled. It has
value of > 5,577 mg/kg in rats for acute oral toxicity and NOAEL of 113 mg/kg/day for target organ (liver) of whole body toxicity. It is also known as reproductive toxicant (1B) and TWA(Time Weighted Average) for it is 10 ppm. Workplace measurements of work places dealing with formamide showed the ppm of all 25 samples was very lower than WEL. However, the exposure concentration can change, depending on workplace condition such as the intensity of work, operating local ventilation system, and wearing protection equipment (Respirators). Therefore, considering it with the risk of whole body toxicity and reproductive toxicity, exposure quantity of each imaginary scenario was calculated at 5.16, 1.72, and
. The average value was calculated at 0.02-0.58, 0.02-0.66 at 90 percent of cumulative distribution, 0.02-0.69 at 95 percent of cumulative distribution. Therefore, it was generally evaluated to be safe because all values were below 1. However, caution is required to prevent health hazard because it has hepatotoxicity and reproductive toxicity and risk of a high level momentary exposure, depending on the condition of workplace.
Finite Element Analysis on the Bearing Loads and Stress of Safety Helmets with an Extruded Structure
Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 43~48
DOI : 10.7842/kigas.2016.20.2.43
This paper presents the finite element analysis results for bearing loads and stress distributions of safety helmets with an extruded structure. Five different analysis models with given same displacement load of 9.4mm have been analyzed for bearing loads and maximum von Mises stress. In these models, model 4 and model 5 are recommended as a maximum bearing load and low maximum stress for given displacement load of 9.4mm.
A Study on the Simplified Estimating Method of Off-site Consequence Analysis for Aqueous Ammonia
Jung, Yu-kyung ; Heo, Hwajin ; Yoo, Byungtae ; Yoon, Yi ; Yoon, Junheon ; Ma, Byungchol ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 49~57
DOI : 10.7842/kigas.2016.20.2.49
Aqueous ammonia is widely used in household cleaners, fertilizers and denitrification process. It is usually treated in concentrations from 10 % to 30 %, and release accidents have occurred frequently. In this study, we developed a simplified estimating method and equation to calculate threat zone easily in case of emergency due to release accident of aqueous ammonia. We calculated the consequence distance for toxic endpoints of aqueous ammonia(concentration 10 % ~ 30 %) at different puddle areas(
) using the ALOHA program. Based on the result, we analyzed the relationship between concentration and puddle area with the threat zone and created the equation.
Hydraulic Design of Natural Gas Transmission Pipeline in the Artic Area
Kim, Young-Pyo ; Kim, Ho-Yeon ; Kim, Woo-Sik ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 58~65
DOI : 10.7842/kigas.2016.20.2.58
Hydraulic analysis of the natural gas transmission pipeline is to determine whether adequate flow can be sustained throughout the design life of pipeline under all expected flow conditions. Many factors have to be considered in the hydraulic design of long-distance pipelines, including the nature, volume, temperature and pressure of fluid to be transported, the length and elevation of pipeline and the environment of terrain traversed. This study reviewed the available gas operation data provided by pipeline construction project in the arctic area and discussed the gas properties such as viscosity and compressibility factor that influence gas flow through a pipeline. Pipeline inside diameter was calculated using several flow equations and pipeline wall thickness was calculated from Barlow's equation applying a safety factor and including the yield strength of the pipe material. The AGA flow equation was used to calculate the pressure drop due to friction, gas temperature and pipeline elevation along the pipeline. The hydraulic design in this study was compared with the report of Alaska Pipeline Project.
Optimal Sensor Placement for Rapid Detecting in Chemical Leak Accident
Cho, Jaehoon ; Kim, Hyunseung ; Kim, Taeok ; Shin, Dongil ;
Journal of the Korean Institute of Gas, volume 20, issue 2, 2016, Pages 66~71
DOI : 10.7842/kigas.2016.20.2.66
Nowadays, a number of sensors which are placed in industrial complex are monitoring areas involving chemical leak and other faults. However, even in the presence of the sensors, chemical leaks, sometimes involving huge amount of chemicals, continuously led to big losses in the industrial complex. In most industries, sensor installation has been performed using past experience or using senor manufacturers' guideline; which leads to poor performance of the installed sensor grid. Therefore, we investigate an optimal placement methodology of point sensors for rapid detention and response when chemical leaks happen. This research suggests a generalized formulation suitable for the optimized decision making of minimizing number of sensors to be placed and increasing the fraction of covered scenarios under assumption of negligible effect of other structures. The proposed method has been verified for suitable performance for simple leak scenario simulations, by achieving the safety objectives and guaranteeing safe process operations.