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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Combustion
Journal Basic Information
Journal DOI :
The Korean Society of Combustion
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Volume & Issues
Volume 16, Issue 4 - Dec 2011
Volume 16, Issue 3 - Sep 2011
Volume 16, Issue 2 - Jun 2011
Volume 16, Issue 1 - Mar 2011
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Numerical Study on Geometries and Operating Parameters of a Steam Reformer for Hydrogen Production
Byun, Kang-Soo ; Lee, Jae-Seong ; Kim, Ho-Young ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 1~11
The main objective of this paper is to investigate characteristic of steam reformer at various geometries and operating conditions. In this paper, the steam reforming is studied by a numerical method and three dimensional simulations were used for effective analytical study. User - Defined Function (UDF) was used to simultaneously calculate reforming and combustion reaction. And the numerical model is validated with experimental results at the same operating conditions. In order to understand the relationship between operating conditions such as gas hourly space velocity(GHSV), mass flow rate of combustor inlet, various numerical investigations are carries out for various geometries. Numerical results show that cylindrical geometry is more effective than rectangular geometry for heat transfer to reactors and reforming efficiency. As mass flow rate of combustor inlet increase, reaction occurs more faster and temperature increase with each geometry. On the other hand, reaction and hydrogen conversion decrease as mass flow rate of reactor decreases.
An Experimental Study on Mode Switching from Air-firing to Oxy-firing in Pilot-scale Combustion Systems
Choi, Chong-Gun ; Na, Ik-Hwan ; Lee, Jae-Wook ; Chae, Tae-Young ; Yang, Won ; Kim, Young-Ju ; Kim, Jong-An ; Seo, Sang-Il ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 12~20
Oxy-coal combustion for
capture in coal power plants entails a mode switching from air-firing to oxyfiring. In this study, procedure of the mode switching was investigated and discussed through experiments in pilot scale facilities: (1) a 0.3
furnace with a vertical single burner and a FGR(Flue Gas Recirculation) system (2) a 1
furnace with horizontal 4 burners and a FGR system. Principle of the mode switching was established and performed with control of FD fan, FGR fan, ID fan and oxygen flow rates. We have found that equivalence ratio in the oxy-firing mode should be increased more than that in the air-firing to achieve stable mode switching. Control of FD, ID and FGR fans should be performed carefully in the mode switching, in the sense of complete combustion and flame attachment. Moisture contents in the ash and the flue gas recycled to the primary oxidizer stream should be removed to prevent condensation, corrosion and duct clogging.
An Experimental Study on Measurement of Chemical Kinetic Parameters of a Liquid Fuel with Various Components
Choi, Hyo-Hyun ; Lim, Jun-Seok ; Kim, Chul-Jin ; Sohn, Chae-Hoon ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 21~26
Thermal analyses are conducted to measure chemical kinetic parameters of an unknown liquid fuel with various components. Thermal Analyses are divided into two different methods such as TGA(Thermo-Gravimetric Analysis) and DSC(Differential Scanning Calorimety). Non-isothermal experimental results are analyzed by adopting TGA and they are filtered by Freeman-Carroll method. As a results of the analysis, chemical parameters of the activation temperature and the reaction order are measured to be 6128.2 K and 1.4, respectively. Furthermore, the chemical kinetic parameters are obtained by a variety of mathematical processing methods. It has been found that they show a little difference depending on the processing method.
Numerical Study of Flame Structure and Emission Characteristics in Metal Fiber Burners
Jeong, Jun-Young ; Kim, Yong-Mo ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 27~32
This study has numerically investigated the flame structure and emission characteristics in the metal fiber burner. The one-dimensional premixed flame approach has been adopted to simulate the combustion processes of the metal fiber burner. Numerical results indicate that the present approach is capable of predicting the essential combustion characteristics of the metal fiber burner. Based on numerical results, the detailed discussion has been made for the effects of equivalence ratio and thermal load on the precise flame structure and the pollutant emission in the metal fiber burner.
Influence of Changing Combustor Pressure on Combustion Characteristics and Reaction Zone in the Partially Premixed Flame with
Son, Je-Ha ; Kim, Jong-Ryul ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 33~40
Combustion experiments were conducted at three different fuels (
) to investigate the effects of combustor pressure (30 ~ -30 kPa) on combustion charateristics and reaction zone structure. Regardless of the fuels, emission index of CO (EICO) increased with decreasing combustor pressure, and EICO of
was mostly affected by changing combustor pressure at subatmospheric pressure. In order to observe reaction zone,
chemiluminescence intensity were measured. The sequence of the chemiluminescence intensity peak position was affected by chemical characteristics of fuels rather than changing combustor pressure. The emission zone thickness of
, defined by the full width at half maximum (FWHM) of
intensity profile, were increased with decreasing combustor pressure. however, the thickness of
exhibited the opposite tendency due to the characteristics of the fuel as the bond structure.
Diffusive-Thermal Instability and Buoyancy-Driven Instability in Laminar Attached Free-jet Flames with DC Electric Fields
Han, Jong-Kyu ; Yoon, Sung-Hwan ; Park, Jeong ; Yun, Jin-Han ; Gil, Sang-In ; Seo, Sang-Il ; Kim, Young-Ju ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 41~51
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, established from the horizontal and vertical injection. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3 - 7.4 Hz were observed in a certain condition with Lewis number more than unity. On the other hand, it was appeared Lewis number induced self-excitation as well as buoyancy-driven self-excitation in the vertical upward injection with DC electric fields. This behavior had frequency range of 1.6 - 9.4 Hz and was exhibited to attribute the buoyancy effect. Finally, a well-defined division about two self-excitations having similar frequency range is briefly discussed.
Effect of Equivalence Ratio on the Combustion Characteristics in a CI Engine Fueled with Biodiesel
Kang, Min-Gu ; Kwon, Seok-Joo ; Cha, June-Pyo ; Lim, Young-Kwan ; Park, Sung-Wook ; Lee, Chang-Sik ;
Journal of the Korean Society of Combustion, volume 16, issue 3, 2011, Pages 52~58
The purpose of this paper is to investigate the effect of equivalence ratio on the combustion and emission characteristics of a compression ignition engine fueled with biodiesel. In this research, a single-cylinder direct injection engine with 373.3 cc of displacement volume was tested on DC dynamometer. In order to investigate the effect of biodiesel equivalence ratio on combustion characteristics, the experiments were conducted at various equivalence ratios and injection pressures of 40~120 MPa. For investigating engine performance, lambda meter was connected and equivalence ratios was varied from 0.6 to 1.0. In addition, the exhaust emissions such as oxides of nitrogen(
), hydrocarbon(HC) and carbon monoxide(CO) were measured by exhaust gas analyzer under the various air/fuel ratios. The experimental results show that maximum IMEP was measured at the 0.8 of equivalence ratio. Furthermore,
emission was rapidly decreased as the increase of equivalence ratio. However soot emission was significantly increased according to the increase of equivalence ratio.