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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 14, Issue 4 - Dec 2009
Volume 14, Issue 3 - Sep 2009
Volume 14, Issue 2 - Jun 2009
Volume 14, Issue 1 - Mar 2009
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Comparative Evaluation of Large-scale Circulating Fluidized Bed (CFB) Boiler Concepts
Kim, Tae-Hyun ; Choi, Sang-Min ; Lee, Jong-Min ;
Journal of the Korean Society of Combustion, volume 14, issue 3, 2009, Pages 1~15
The circulating fluidized bed (CFB) boiler has some problems to scale up. Several engineering solutions have been proposed by a few suppliers which had advanced CFB technology. Large-scale CFB design concepts from different suppliers were reviewed and compared. Points of the hydrodynamic and heat recovery were summarized and discussed for developing the guideline of the large-scale circulating fluidized bed boilers.
Combustion Characteristics of High Moisture Indonesia Coal as a Pulverized Fuel at Thermal Power Plant
Kim, Jae-Kwan ; Lee, Hyun-Dong ;
Journal of the Korean Society of Combustion, volume 14, issue 3, 2009, Pages 16~23
It is strongly desired for coal-fired power plants to utilize not only low-rank coals with high moisture contents, but also lowering cost with diversifying fuel sources. In this study, combustion characteristics of low rank coal with high moisture, and standard pulverized coals are experimentally investigated using TGA (Thermogravimetric Analysis) and DTF (drop tube furnace). The coals tested are three kinds of coal with moisture content ranging from 8.32 to 26.82%. The results show that under the air combustion condition, the burn-out time at TGA rises as moisture content increases, and standard pulverized coal with 8.32% moisture content showed the lowest activation energy of 55.73 kJ/mol. In case of the high amount of moisture, the combustion efficiency decreases due to evaporation heat loss, and unburned carbon in ash produced at combustion process in DTF increased. Aslo, initial deformation temperature of slag attached in alumina tube of DTF decreased with lowering the crytallinity of anorthite and augite. To improve the combustion reactivity and efficiency, it is effective to upgrade through drying the high moisture coal to moisture level (less than 10%) of standard pulverized coal.
A Numerical Simulation for Design of High Temperature Ceramic Heat Exchanger
Park, Kyung-Seo ; Choi, Chong-Gun ; Nam, Jin-Hyun ; Shin, Doog-Hoon ; Park, Sang-Hwan ;
Journal of the Korean Society of Combustion, volume 14, issue 3, 2009, Pages 24~28
To improve its efficiency, most of the industrial furnace had been used recuperator. However, commonly used metal recuperator is not suitable under condition of temperature higher than
. The other hand, ceramic recuperator is able to use in high temperature condition. In the present study, the design program based on the basic heat exchanger design theory, and CFD modelling are applied to ceramic recuperator to verify the design results. Using design program to find the optimum design factor on the variation of recuperator condition. The result of this study are as follows : Thinner fin-plate thickness reduces pressure drop and increases heat-transfer rate, However, thin plate or plate with thin thickness(< 5 mm) is difficult to manufacture, due to limited mechanically strength.
Characteristization of Spray Combustion and Turbulent Flame Structures in a Typical Diesel Engine Condition
Lee, Young-J. ; Huh, Kang-Y. ;
Journal of the Korean Society of Combustion, volume 14, issue 3, 2009, Pages 29~36
Simulation is performed to analyze the characteristics of turbulent spray combustion in a diesel engine condition. An extended Conditional Moment Closure (CMC) model is employed to resolve coupling between chemistry and turbulence. Relevant time and length scales and dimensionless numbers are estimated at the tip and the mid spray region during spray development and combustion. The liquid volume fractions are small enough to support validity of droplets assumed as point sources in two-phase flow. The mean scalar dissipation rates (SDR) are lower than the extinction limit to show flame stability throughout the combustion period. The Kolmogorov scales remain relatively constant, while the integral scales increase with decay of turbulence. The chemical time scale decreases abruptly to a small value as ignition occurs with subsequent heat release. The Da and Ka show opposite trends due to variation in the chemical time scale. More work is in progress to identify the spray combustion regimes.
Numerical Simulations for Combustion and NOx Emission Characteristics in Oscillating Combustion Burner
Kim, Hoo-Joong ; Cho, Han-Chang ;
Journal of the Korean Society of Combustion, volume 14, issue 3, 2009, Pages 37~44
An experimental study was conducted to reduce NOx emission in RT(radiant tube)burner by using oscillating combustion processes in RIST. A solenoid valve gives the various oscillating conditions, such as oscillation frequency, duty ratio of fuel flow. In this study, we used commercial software, CFD-ACE+ to predict combustion and NOx emission characteristics for various experimental oscillation conditions. The effect of oscillation frequency and duty ratio on NOx emission will be discussed in terms of flow field, temperature and equivalence ratio distributions in detail.