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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 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
A Study on Commercialization Feasibility of HCNG Engine in Emissions Characteristics
Park, Cheolwoong ; Kim, Changgi ; Choi, Young ; Lee, Janghee ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 1~6
DOI : 10.7842/kigas.2013.17.1.1
Using natural gas-hydrogen blended fuel (HCNG) in a heavy duty vehicle is regarded as an alternative to meet reinforced emission regulation compared to a recent direct injection (DI) diesel engine. Hydrogen can lead stable lean combustion even under leaner mixture condition than natural gas, so that improving not only thermal efficiency but also
emissions. In the present study, the feasibility of HCNG engine's commercialization was accessed with HCNG fuel (30%
and 70% natural gas) in aspect to the reliability and possibility to reduce
emissions by the level of EURO-VI under various operating conditions.
A Study on the Knocking Characteristics with Various Excess Air Ratio in a HCNG Engine
Lim, Gihun ; Park, Cheolwoong ; Lee, Sungwon ; Choi, Young ; Kim, Changgi ; Lee, Janghee ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 7~12
DOI : 10.7842/kigas.2013.17.1.7
As emission regulation for vehicle has been reinforced, many researches carried out for HCNG(hydrogen-natural gas blends) fuel to the conventional compressed natural gas (CNG) engine. However, abnormal combustion such as backfire, pre-ignition or knocking can be caused due to high combustion speed of hydrogen and it can result in over heating of engine or reduction of thermal efficiency and power output. In the present study, improvement of combustion performance was observed with HCNG fuel since it can extend a flammability limit. Knocking characteristics for CNG and HCNG fuel were investigated. Feasibility of HCNG fuel was evaluated by checking the knock margin according to excess air ratio. The operation of engine with HCNG was stable at minimum advance for best torque(MBT) spark timing and knock phenomena were not detected. However, it is necessary to prepare higher knock tendency since possibility of knock is higher with HCNG fuel.
Interactions between Propagating Flame Fronts and Obstacles in an Explosion Chamber with a H/L Ratio of 0.86
Park, Dal Jae ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 13~18
DOI : 10.7842/kigas.2013.17.1.13
Experimental studies were carried out to investigate the interactions between the propagating flame fronts and different multiple obstacles within an explosion chamber. The explosion chamber is 600 mm in height,
in cross-section and has a H/L value of 0.86. Three different multiple obstacles with the blockage ratio of 0.43 were replaced within the chamber. The results showed that relatively higher local flame displacement speed was observed with the triangular obstacle while the lower was observed with the circular one. It was found that the local flame displacement speeds behind the obstacle were largely dependent on the obstacle types. It was also found that as the flame interacted with the flow field generated behind the obstacle, the probability density functions(PDFs) of the local flame displacement speed were extensively distributed toward higher speeds.
A Study on Estimation of Infinite Fatigue Life in Cruciform Fillet Welded Joint
Lee, Yong-Bok ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 19~25
DOI : 10.7842/kigas.2013.17.1.19
The joining methods of steel structures of gas facilities, bridges, ships etc. by welding are composed mostly of T-type or cruciform fillet welding and full penetration or partial penetration according to the uses and the shape of the structures. In this study, it was examined the characteristics of fatigue crack according to penetration depth in relation to material thickness in the cruciform fillet welded joints. From the results, it was investigated the safe design stresses within the range of infinite life. When the LOP length is long the range of infinite life is small with root failure and when the LOP length is short the range of infinite life is large with teo failure. For the specimen of material thickness, 20mm welded by 3 pass compared with 10mm, 15mm welded by 2 pass, the fatigue strength and the range of infinite life was more improved by increasing of notch toughness from formation of micro-ferrite acicular structure.
Study on Flow behavior of Liquid Nitrogen for Porous Media in Square-section Cylinder
Choi, Sung Woong ; Lee, Woo Il ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 26~34
DOI : 10.7842/kigas.2013.17.1.26
The multiphase flow analysis related to phase change can be adapted to lots of areas such as evaporation and condensation has many interesting branches due to complicated phenomenon. In this study, the experimental investigation of cryogenic liquid in the porous media with various densities was shown how the cryogenic liquid behaves in the porous structure. For this study, permeability behaviors under different applying pressure of the glass wool with different bulk densities are discussed. Experimental investigation on the behavior of cryogenic liquefied nitrogen in the porous media is conducted. The result was that the non linearity of pressure gradient with location is increased and the permeability is decreased as the bulk density of glass wool increased. Lastly, simulation results with CFD commercial package program are used to realize the cryogenic liquid's flow in porous media to compare the finding with experimental results.
Study on Flame Retardancy and Thermal Resistance Properties of Phenolic Foam and Polyurethane Foam
Lee, Ju-Chan ; Seo, Jung-Seok ; Kim, Sang Bum ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 35~41
DOI : 10.7842/kigas.2013.17.1.35
In this study, flame retardancy of polyurethane foam and phenolic foam were investigated by addition of phosphorous flame retardants. The thermal degradation behavior of polyurethane foam and phenolic foam in the presence of flame retardants has been studied by thermogravimetric analysis(TGA). Heat release rate(HRR), mean HRR, mass loss rate(MLR), total smoke released(TSR) and limited oxygen index(LOI) were tested by cone calorimeter. From the test results, Phenolic foam showed low HRR, MLR and TSR than polyurethane foam.
A Study on Economic Analysis of Natural Gas Cooling
Kim, Ki-Ho ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 42~48
DOI : 10.7842/kigas.2013.17.1.42
The global warming of the Korean Peninsula proceeds most rapidly in the world and its abnormal climate is more deepening. In the result of the surged electricity consumption by intense heat of summer and severe cold of winter, electricity supply and demand status is in hard situation. Currently, the supply of natural gas is increased because natural gas has the lowest greenhouse-gas emissions among the existed fossil fuel. Natural gas cooling has a lot of advantage such as decreasing electricity peak, reducing construction expenses in additional power plant, operating natural gas storage facilities efficiently, and playing a role as distributed generations. Therefore, this study analyzes the economic feasibilities of gas cooling as an alternative for electric power load management.
Reliability Analysis of k-out-of-n System Using Reliability Path
Lee, Heon Seok ; Yang, Jae Mo ; Yoo, Byungtae ; Park, Chulhwan ; Kim, Deaheum ; Ko, Jae Wook ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 49~55
DOI : 10.7842/kigas.2013.17.1.49
Large scale systems, the facilities for the production of power, gas and chemical, have the complex structures. Most systems require the high reliability for the improvement of process efficiency, but it is difficult to analyze the reliability of processes with complex structures. In this study, we investigated reliability path of chemical process with k-out-of-n system by reliability block diagram(RBD) and calculated the reliability of process through the failure enumeration method of reliability path. This method should help in analyzing the reliability of k-out-of-n system.
A Study on Semi Quantitative Risk Analysis for Air Separation Unit using a GRA(Generic Risk Analysis) Method
Shin, Jung-Soo ; Byun, Hun-Soo ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 56~66
DOI : 10.7842/kigas.2013.17.1.56
The gas production plants supply the inert gas to production plants for maintaining safe operation and also supply combustible, flammable, explosive and toxic gases as functions of basic materials needed for producing chemical goods. In addition, gas plants need to be safe and reliable operation because they are operated under high temperature, high pressure, cryogenic and catalytic reactions. As these plants have a complex process in operation, there has been a risk that major industrial accidents such as a fire, explosion and toxic gas released, also risks of asphyxiations by inert gases and burns caused by high temperature and cryogenic substances. This study is to carry out the semi quantitative risk assesment method which is the generic risk analysis (GRA). This method is applied to air separation unit(ASU) to identify its initial risk, safety barriers, residual risk and elements important for safety(EIS). The result of this study, suggested the management tools and procedures of implementation for EIS management.
Study on Simulation and Optimization of C3MR Liquefaction Cycle
Park, Chang Won ; Cha, Kyu Sang ; Lee, Sang Gyu ; Lee, Chel Gu ; Choi, Keun Hyung ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 67~72
DOI : 10.7842/kigas.2013.17.1.67
The LNG liquefaction plant which have a higher value-added business in the LNG value chain takes about 35% of total cost. Liquefaction process is core technology of liquefaction plant. Almost all of cost which was consumed from the liquefaction plant, using for operation energy of liquefaction process. The cost can be reduced by increasing efficiency of liquefaction cycle. C3MR(propane pre-cooled, mixed refrigerant cycle) which liquefies NG using propane and MR cycle has the high efficiency, so C3MR is mostly used liquefaction process in LNG industry. In this study, process simulation and analysis were performed for C3MR process. C3MR process variables were found through this simulation and analysis, and then the process optimization was performed. It is considered that the results of process analysis, process variables and process optimization study can be utilized to develope new liquefaction process.
Finite Element Analysis on the Sealing Behavior and Endurance Safety of O-rings with a V-groove
Kim, Chung Kyun ;
Journal of the Korean Institute of Gas, volume 17, issue 1, 2013, Pages 73~80
DOI : 10.7842/kigas.2013.17.1.73
This study presents sealing behavior and endurance safety of V-grooved o-rings as functions of a strain, compression stress, and contact normal stress using a FEM technique. The FEM results on the sealing behavior and endurance safety show that the maximum strain, maximum compression stress, and maximum contact normal stress of V-grooved o-rings are approximately 1.2 times higher than those of conventional solid o-rings. This is why that an o-ring has a V-groove in the center between two overlapped circles, which is very effective in sealing for ball valves, pressure vessels, and gas equipment. And the extrusion failure in V-grooved o-rings does not take place under an increased gas pressure due to a V-groove. This may extend sealing life compared with that of a conventional solid o-ring.