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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
Selecting the target year
A Study on Design Characteristics of Yeosu Circulating Fluidized Bed Boiler
Kim, Jae-Sung ; Lee, Jong-Min ; Kim, Dong-Won ; Kim, Tae-Hyun ; Choi, Sang-Min ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 1~7
340 MWe circulating fluidized bed (CFB) boiler in Yeosu power station is under construction. The circulating fluidized bed boiler in the Yeosu power plant has a number of differences from other domestic boilers in terms of scale and design. Evaluation of design parameters of the Yeosu CFB boiler should be required because the direct application of existing technology is limited. In this study, design characteristics of the Yeosu CFB boiler was summarized. And thermogravimetric analysis was conducted with comparing other rank coals. Watersteam side heat absorption, flue gas temperature and heat transfer coefficient were calculated by heat and mass balance. Design parameters for the Yeosu CFB boiler were discussed along with typical value in the CFB design range.
Characteristics of Tar Generation during the interval of Gasification of Woodchip
Moon, Ji-Hong ; Lee, Uen-Do ; Ryu, Chang-Kook ; Lee, Youn-Man ; Bae, Woo-Keun ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 8~14
Biomass gasification is a promising technology in terms of clean energy and flexible options for end use such as heat, steam, electricity, gaseous or liquid fuels. In a gasification process, reduction of tar is very important because it can cause any mechanical problems and small tar implies high energy efficiency. However, generation and conversion mechanisms of tar have not been fully understood due to its complex nature. In this study, characteristics of tar generated from different gasification stages were investigated. Korean pine woodchip was used as feedstock and tar was sampled in a separate way during devolatilization and char gasification stage, investigated. As a result. more various kinds of hydro carbon compounds were identified in the devolatilization stage than char gasification stage because primary tar compounds are released mostly from pyrolysis of cellulose and hemicellulose. When the reaction temperature increased up to
, tar composition becomes simplified into about 10 aromatic compounds mostly with 1-4 rings without substitution up to phenanthrene. The sampled tar in the char gasification stage mostly contains 5-7 simple aromatic compounds.
Stability Characteristics of Syngas(
/CO)/Air Premixed Flames using an Impinging Jet Burner
Park, Ju-Yong ; Lee, Kee-Man ; Hwang, Cheol-Hong ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 15~21
An experimental study was conducted to investigate the flame stability of the synthetic gas (syngas) using an impinging premixed jet burner. Since the syngas mainly consisted of
and CO, the
/CO mixture was simulated as the syngas.
/CO mixture ratios, fuel/air mixture velocities and equivalence ratios were used as major parameters on the flame stabilitym The role of the impinging plate on the flame stability was also examined. In addition, laminar burning velocities of the
/CO mixture were predicted numerically to understand the characteristics of the flame stability for the syngas. The increase in the H2 concentration into the syngas brings about the extension of the blowout limit and the reduction in the flashback limit in terms of the stable flame region. The impinging jet plate broadened the blowout limit but does not play important role in changing of the flashback limit. Finally, it was found that the stability region of the flame using the syngas, which is expressed in terms of the mixture velocity and the equivalence ratio in this study, significantly differed from that of
Combustion Characteristics of Blended Coals with Bituminous and Sub-bituminous in Oxy-fuel Combustion Conditions
Sung, Yon-Mo ; Moon, Cheor-Eon ; Ahn, Seong-Yool ; Kim, Seung-Il ; Seo, Sang-Il ; Kim, Tae-Hyung ; Jeong, Ji-Hwan ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 22~29
This paper focuses on the combustion characteristics of blended coals with bituminous and sub-bituminous coals under air and oxy-fuel combustion conditions. The effects of oxygen concentration and blending ratio on the combustion characteristics were experimentally investigated using a thermogravimetric analyser (TGA). Characteristic temperatures including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. As oxygen concentration increased and the presence of sub-bituminous coal, characteristic temperatures and activation energy decreased. The ignitability, reactivity and kinetics have all been greatly improved under oxy-fuel combustion conditions. Based on this, co-firing with bituminous and sub-bituminous coals under oxy-fuel combustion conditions may be suggested as an alternative method to the fuel flexibility and cost-effective power production with carbon capture and sequestration.
Flamelet Analysis for Transient Response to Pressure Oscillations
Bae, Jun-Kyung ; Kim, Yong-Mo ; Kim, Seong-Ku ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 30~35
This study has been mainly motivated to numerically investigate the transient flame response to pressure oscillations in the gaseous hydrogen - liquid oxygen flames at supercritical pressures. The present analysis is based on the real-fluid transient flamlet model and the flame field is acoustically perturbed only by the sinewave oscillations in the frequency range from 1,000 Hz to 5,000 Hz. Based on numerical results, the detailed discussions are made for the flame response characteristics and the transient flamelet response associated with the high-frequency combustion instability in the liquid propellant rocket engines.
The Effect of Operating Conditions on the Heat-flow Characteristics and Reforming Efficiency of Steam Reformer with Combustor
Kim, Ji-Seok ; Lee, Jae-Seong ; Kim, Ho-Young ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 36~45
The heat-flow characteristics and reforming efficiency of steam reformer with combustor are numerically investigated at various operating conditions. SCR(Steam to Carbon Ratio) and GHSV(Gas Hourly Space Velocity) are adopted as important operating conditions. User-Defined-Function(UDF) was used to simultaneously calculate reforming and combustion reaction. Numerical results show that hot burned gas rise by a buoyant force and heat exchange between reforming reactors and cocurrent flow occurs in the combustion region. The results also indicate that an increase of SCR leads to decrease the mole fraction of hydrogen at the reactor outlet. As GHSV increases, conversion rate decreases.
An Experimental Study for Performance Evaluation of a Ceramic Heat Exchanger
Choi, Hyun-Soo ; Shin, Dong-Hoon ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 46~51
Exhaust gas of an industrial furnace used at such as metallurgy or ceramic manufacturing usually contains thermal energy with high temperature which can be recycled by heat exchanger. However, when the temperature of the exhaust gas is high such as more than
, ordinary metallic heat exchanger cannot fully recover the heat due to the limitation of operating temperature depending on the material property. In the present study, a compact ceramic heat exchanger of cross flow type is introduced and evaluated by heat exchange rate and operating temperature. The ceramic heat exchanger can endure the gas temperature more than
, and its volumetric heat exchanging rate exceeds 1 MW/
. The experimental data is also compared with the previous numerical result which shows reasonable agreement. Meanwhile, the gas leakage rate is measured to be about 3~4%, and heat loss to environmental air is about 23~26% of the fuel energy.
Fuel Injection System on Combustion and Exhaust Emissions Characteristics in Compression Ignition Engines
Kwon, Seok-Joo ; Cha, June-Pyo ; Sung, Ki-An ; Park, Sung-Wook ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 52~57
The present study describes the characteristics of combustion and exhaust emissions in compression ignition engines using diesel-gasoline dual fuel. For investigating combustion characteristics, diesel fuel was injected directly in a single-cylinder compression ignition engine with a common-rail injection system and gasoline fuel was injected into a premixed chamber installed in an intake port. In order to investigate exhaust emission characteristics, exhaust gas was measured by emission analyzer and smoke meter. The experimental results showed that cases of diesel-gasoline dual fuel combustion exhibited extended ignition delay and reduced peak combustion pressure compared to those of directly injected diesel fuel cases. Furthermore, premixed gasoline-air mixture reduced NOx emissions due to low peak of rate of heat release(ROHR).
Basic Study on Combustion Characteristics of Coaxial Premixed Burner with the Addition of
Park, Seung-Il ; Kim, Go-Tae ; Kim, Nam-Il ;
Journal of the Korean Society of Combustion, volume 16, issue 1, 2011, Pages 58~65
Thermal spray technology has been used in many industrial application. Especially, thermal spray coating have been employed with the purposes of achieving better resistances in abrasion, heat and corrosion. In the previous studies on the thermal spray coating, thermal spray characteristics from the perspective of combustion engineering have not been investigated sufficiently, while the material characteristics of the coated substrates have been investigated widely. In this study, the effect of spray particles on the flame behavior was experimentally investigated. The amount of the injected particles was measured using the light scattering method and the temperature of the particles was estimated using a two-color method. Various flame-spray interactions were observed and it was found that the high temperature zone near the flame is elongated by particles density. Based on these results, the applicability of the light scattering method and the two-color method was discussed.