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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 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
A Study on the Emissions Characteristics of a LPG Vehicle According to Various Test Modes and Ambient Conditions
Lee, Min-Ho ; Ha, Jong-Han ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 1~7
DOI : 10.7842/kigas.2015.19.4.1
As the interest on the air pollution is gradually rising up at home and abroad, automotive and fuel researchers have been working on the exhaust emission reduction from vehicles through a lot of approaches, which consist of new engine design, innovative after-treatment systems, using clean (eco-friendly alternative) fuels and fuel quality improvement. This research has brought forward various main issues : whether PM emissions should be regulated for diesel and gasoline vehicles and whether gasoline and LPG powered vehicles can be further neglected from PM emission inventories. Finally, the greenhouse gas regulation has been discussed including automotive emission regulation. The greenhouse gas and emissions of automotive had many problem that cause of ambient pollution, health effects. Based on various test modes and ambient conditions, this paper discusses the characteristics of LPG on exhaust emissions and greenhouse gases. Also, this paper assessed emission characteristics due to the test temperature. These test temperature were performed by dividing the temperature of the test mode and the lowest local temperature in winter. Through this study, the correlation of vehicle test mode and ambient condition, exhaust emission, greenhouse gas emission was analyzed.
The Measurement of the Fire and Explosion Properties for 2-Methyl-1-butanol
Ha, Dong-Myeong ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 8~14
DOI : 10.7842/kigas.2015.19.4.8
For the safe handling of 2-methyl-1-butanol being used in various ways in the chemical industry, the flash point and the autoignition temperature(AIT) of 2-methyl-1-butanol was experimented. And, the lower explosion limit of 2-methyl-1-butanol was calculated by using the lower flash point obtained in the experiment. The flash points of 2-methyl-1-butanol by using the Setaflash and Pensky-Martens closed-cup testers measured
, respectively. The flash points of 2-methyl-1-butanol by using the Tag and Cleveland open cup testers are measured
. The AIT of 2-methyl-1-butanol by ASTM 659E tester was measured as
. The lower explosion limit by the measured flash point
was calculated as 1.30 Vol.%. It was possible to predict lower explosion limit by using the experimental flash point or flash point in the literature.
A Study on Improvement of Safety Management in Subcontractor through Process Safety Management
Lee, Joo Yeob ; Lee, Keun Won ; Kim, Kyu-Jung ; Kim, Tae-Ok ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 15~21
DOI : 10.7842/kigas.2015.19.4.15
Looking at the large and small fire, explosion, or release accidents that occurred recently, we can see that the accident of subcontractor workers has been increased in the contractor workplace while a harmful or dangerous maintenance works. In this study, the actual status of subcontractor's safety management was examined by using the questionnaire to the contractor who submitted the process safety report. In order to improve the safety management of subcontractors, the responsibility and rational role-sharing between the contractors and subcontractors were reviewed. Also, Providing safety and health information and worker protection measures during maintenance were investigated. The results of this study can be used to help strengthen and improvement safety management of the subcontractor at the time of a hazardous or dangerous works. In addition, it will be utilized to reduce industrial accidents and to build mutual cooperation relationship between contractor and subcontractor.
Evaluation of EGR applicability for NO
reduction in lean-burn LPG direct injection engine
Park, Cheolwoong ; Cho, Seehyeon ; Kim, Taeyoung ; Cho, Gyubaek ; Lee, Janghee ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 22~28
DOI : 10.7842/kigas.2015.19.4.22
In order to keep the competitiveness of LPG fuel for transportation fuel, the difference in fuel consumption with gasoline and cost for an aftertreatment system should be reduced with continuous development of technology for LPG engine. In the present study, spray-guided type direct injection combustion system, whose configuration is composed of direct injector in the vicinity of spark plug, was employed to realize stable lean combustion. A certain level of nitrogen oxides(
) emits due to a locally rich mixture regions in the stratified mixture. With the application of EGR system for the reduction of
, 15% of
reduction was achieved whereas fuel consumption and hydrocarbon emission increased. By the application of EGR, the combustion speed reduced especially appeared at initial flame development period and peak heat release rates and increasing rates for heat release rate decreased as EGR rate increased due to the dilution effect of intake air.
Consequence Analysis for Accidental Gas Release in Labs
Jang, Yuri ; Jung, Seungho ; Park, Kyoshik ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 29~34
DOI : 10.7842/kigas.2015.19.4.29
Accidents in laboratory dealing with chemicals have constantly occurred. In the case of a gas explosion or an accident related to leakage of chemical materials, the damage is much greater, thereby leading to a serious accident. Especially, the safety of laboratory in University is important because students build up knowledge and skills and accumulate experience as the main researchers. In this paper, 5 gases(CO,
) are selected to model since they are often used in university laboratories. From the scenarios where the gases are released, the diffusion process is estimated and analyzed to predict damage degree by PHAST v.6.7. Internal diffusion process is modeled through FLUENT which is Computational Fluid Dynamics(CFD) tool. Also, we compare indoor damage with outdoor one when discharged to the outside through the laboratory's window. In the modeling results, the outdoor damages for accident scenarios in the results are far less than then of real plants since the vessel usually used in laboratory(i.e. the capacity of the cylinder; 47 L or less) is significantly less than workplace's one(using ton measure). However as shown in the results small amount can have high consequences for indoor accidents.
The Power Spectral Density Characteristics of Lift and Drag Fluctuation on a Heat Exchanger Circular Tube
Ha, Ji Soo ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 35~40
DOI : 10.7842/kigas.2015.19.4.35
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 and the nondimensional PSD(Power Spectral Density) function with the Strouhal number, fD/U, had been derived by experimental method. The present study examined the results of the previous experimental researches for the nondimensional PSD characteristics by CFD analysis and the basis for the application of flow induced vibration to the heat recovery steam generator tube array would be prepared from the present CFD analysis. For the previous mentioned purpose, the present CFD analysis introduced a single circular cylinder and calculated with the unsteady laminar flow over the cylinder. The characteristics of vortex shedding and lift and drag fluctuation over the cylinder was investigated. The derived nondimensional PSD was compared with the results of the previous experimental researches and the characteristics of lift and drag PSD over a single circular cylinder was established from the present CFD study.
Experimental Study on the Performance Characteristics of a Scroll Expander for 1kW-class Organic Rankine Cycle
Kim, Dokyun ; Yun, Eunkoo ; Yoon, Sang Youl ; Kim, Kyung Chun ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 41~48
DOI : 10.7842/kigas.2015.19.4.41
The performance characteristics of a scroll expander is the most important variable for the performance of organic Rankine cycle system. In this paper, the performance characteristics of a scroll expander was identified using 1kW class organic Rankine cycle system with various operating conditions. The ORC system is composed of an evaporator, a scroll expander, a condenser and a working fluid feed pump that uses R245fa as working fluid. The hot water temperature was controlled from
by the 50kW-class electric water-heater. The maximum isentropic efficiency of the scroll expander was measured about 77%, and the shaft power was measured from 0.5 kW to 1.8 kW according to heat source temperatures.
A Study on Accident Frequency by Installing Safety Devices in the LPG Heating and Drying Furnace
Song, Dong-Woo ; Kim, Ki-Sung ; Kim, Choong-Hee ; Lee, Seong-Gueong ; Lee, Su-Kyung ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 49~54
DOI : 10.7842/kigas.2015.19.4.49
The purpose of this study is to assess the risk of depending on the presence or absence of safety device of domestic heating and drying furnaces, by derivation and analysis of accident frequency of safety devices through FTA (Fault Tree Analysis). Installation standards are lacking in Korean for the safety device of LPG heating and drying furnace, which have a risk of explosion due to structure to trap the leaked gas. Four different safety devices were selected on the basis of NFPA and national standards for combustors of other equipment. Effects of frequency reduction in accidents were analyzed before and after installing the safety devices respectively. As a result, a minimal leakage safety device was presented for preventing damages from gas leak of domestic LPG heating and drying furnace.
Characteristic Analysis of Displacement Behavior of Hollow Rollers with Cross Sectional Area Profiles
Chung, Joon Ki ; Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 55~61
DOI : 10.7842/kigas.2015.19.4.55
In this paper, the displacement behavior characteristic of hollow rollers with various cross sectional area profiles and circular plate for load supporting capacity increment has been presented using a finite element method. The FEM results present that the hollow roller with X-shaped or Y-shaped columns between outer tube, middle tube and inner tube reduces a maximum displacement at the middle length of hollow rollers. And the circular plate, which is inserted at the middle of the hollow roller, is very useful to reduce the maximum displacement of hollow rollers with the plate thickness of 30~40mm. This paper presents the weight vs the maximum displacement ratio in which is represented for the optimized design as a function of a hollow roller total weight. The FEM analyzed results recommend the design model 4, 5 and 6 of hollow rollers for decreasing the ratio of maximum displacement and total weight of hollow rollers.
An Estimation of the Consequence Analysis for an Underground Installation of the LPG Storage Tanks
Song, Dong-Woo ; Jun, Woon-Young ; Lee, Su-Kyung ;
Journal of the Korean Institute of Gas, volume 19, issue 4, 2015, Pages 62~67
DOI : 10.7842/kigas.2015.19.4.62
In this paper, the consequence analysis has been evaluated for the damage effects of the LPG storage tanks when they are installed on the ground or underground. They should be performed to identify measures to reduce risks for the LPG storage tanks which are more widely used. In order to conduct a damage effect evaluation of the LPG storage tanks installed underground, FDS was used to simulate the LPG storage tanks installed and housed within a facility. The maximum pressure of the storage facilities for the LPG storage tanks has been calculated from the FDS, and it's results are used as an input variable for Phast which is a commercial software for evaluating the damage effects. Getting results from the consequence analysis and computational simulations(diffusion range of LFL and UFL, jet fire or explosions) were quantitatively presented for the damage effects.