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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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Numerical Modelling of Temperature Distribution and Pressure Drop through the Layered Burden Loading in a Blast Furnace
Yang, Kwang-Heok ; Choi, Sang-Min ; Chung, Jin-Kyung ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 1~6
Analysis of the internal state of the blast furnace is necessary to predict and to control the operating conditions. Especially, it is important to develop models of the blast furnace to predict the cohesive zone because shape of the cohesive zone influences overall operating conditions of blast furnace such as gas flow, chemical reactions and temperature. Because many previous blast furnace models have assumed cohesive zone to be fixed, it was not possible to evaluate the shape change of cohesive zone in relation with operating conditions such as PCR, blast condition, and production rate. In this study, an axi-symmetric 2-dimensional steady state model is proposed to simulate blast furnace processes. In this model, cohesive zone is determined by the solid temperature. Finite volume method is employed for numerical simulation. To find location of the cohesive zone, entire calculation procedure is iterated until converged. Through this approach, shape of the cohesive zone, velocity and temperature within the furnace are predicted from the model.
Combustion Characteristic and Stability of Flat Premixed Ceramic Burner with Different Porous Baffle Plates
Lee, Jae-Young ; Lee, Pil-Hyong ; Park, Chang-Soo ; Park, Bong-Il ; Hwang, Sang-Soon ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 7~16
Porous metal plates (Metal fiber, muti-hole metal plate) using mainly in surface burner are known to have a corrosion and durability problem under high temperature condition. In this study, premixed flat flame with perforated ceramic tile of more durable cordierite material was examined with respect to combustion stability and emission. The flat premixed ceramic burner consists of perforated ceramic tile and various type of baffle plates to form stable surface flame. The results show that most stable flat flame is generated using baffle plate with open ratio of 0.193. In downward flat flame mode which is widely used in condensing boiler, CO is measured below 50ppm from equivalence ratio 0.755 to 0.765 and
is measured below 12ppm from equivalence ratio 0.75 to 0.79. It is also found that the range of blue flame in flame stability curve becomes wider with increasing heat capacity.
The Effect of Biomass Reburning with Rice Husk on NOx Reduction in Light Oil Flame
Kim, Se-Won ; Shin, Myeung-Chul ; Lee, Chang-Yeop ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 17~24
Reburning is one of the most useful technologies for reducing nitric oxide in economically and technically. The reburning process was demonstrated as an effective NOx reduction method through injection of a secondary hydrocarbon fuel. An experimental study has been conducted to evaluate the effect of biomass reburning on NOx and CO formation in a light oil flamed combustion furnace. Reburning tests on NOx reduction of air-carried rice husk powder as the reburn fuel and light oil as the main fuel were performed in flames stabilized by a co-flow swirl and fuel staged burner, which was mounted at the front of the furnace. The results included flue gas emissions and temperature distribution in the furnace for several kinds of experimental conditions. It was observed clearly that NOx concentrations in the exhaust have considerably decreased due to effect of biomass reburning. The maximum NOx reduction rate was 42% when the reburn fuel fraction was 0.18. The CO emissions were kept under 42 ppmv in all experimental tests. And this paper makes clear that in order to decrease NOx concentration in the exhaust when the biomass reburning system is adapted, the control of some factors such as reburn fuel fraction and reburn zone fraction is very important.
The Comparison Study on Reburning Effects of LNG and Rice Husk in Heavy Oil Flamed Furnace
Shin, Myeung-Chul ; Kim, Se-Won ; Lee, Chang-Yeop ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 25~32
In commercial combustion systems, heavy oil is one of main hydrocarbon fuel because of its economical efficiency. Regarding heavy oil combustion, due to increasing concerns over environmental pollutants such as carbon monoxide, unburned hydrocarbon and nitrogen oxides, development of low pollutant emission methods has become an imminent issue for practical application to numerous combustion devices. Also a great amount of effort has been tried to developed effective methods for practical using of biomass. It is also an important issue to reduce carbon tax. In this paper, an experimental study has been conducted to evaluate the effect of biomass reburning on NOx formation in a heavy oil flamed combustion furnace. Experiments were performed in flames stabilized by a multi-staged burner, which was mounted at the front of the furnace. Experimental tests were conducted using air-carried rice husk powder and LNG as the reburn fuel and heavy oil as the main fuel. The paper reports data on flue gas emissions and temperature distribution in the furnace for several kinds of experimental conditions. NOx concentration in the exhaust has decreased considerably due to effect of reburning. The maximum NOx reduction rate was 62% when the rice husk was used by reburn fuel, however it was 59% when the LNG was used by reburn fuel. The result shows the positive possibility of biomass reburning system for optimal NOx reduction.
Radiation Heat Flux and Combustion Characteristics of Inverse Diffusion Flame Burner Using Synthesis Gas, Part 1 : Air-Fuel Combustion
Lee, Pil-Hyong ; Park, Chang-Soo ; Lee, Jae-Young ; Park, Bong-Il ; Hwang, Sang-Soon ; Lee, Sung-Ho ; Anh, Yong-Soo ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 33~40
Waste Thermal Pyrolysis Melting process was proposed and has been studied in order to prevent air pollution by dioxin and fly ash generated from combustion process for disposal of waste. In this study, applicability as the fuel of diffusion burner of synthesis gas formed from Waste Thermal Pyrolysis process was addressed. Results showed that there is no big difference in the flame shape between MNDF and SNDF, and lift off was detected in MIDF but flame is more stable in SIDF which contains hydrogen with high combustion velocity as flow rate in first nozzle is increased. And radiation heat flux in inverse diffusion flame of synthesis gas was found to be more by 1.5 times than that in inverse diffusion flame of methane because of higher mole fraction of
with high emissivity in product gas.
The Characteristics of Local Reaction Intensity with Changing Combustor Pressure in the Swirl-stabilized Flame
Noh, Young-Gu ; Kim, Jong-Ryul ; Kim, Tae-Hyung ; Seo, Sang-Il ; Kim, Sung-Chul ; Na, Jong-Moon ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 41~47
An experimental study was performed to confirm the effect of the changing combustor pressure(-30~30 kpa), combustion characteristics were investigated by measuring the local chemiluminescence intensity, the local temperature distribution and emission. In order to investigate combustion ones, the combustor pressure index(
) was controlled in the range of 0.7~1.3 for each equivalence ratio in the present combustion system, where
is defined as the ratio of absolute pressure to atmospheric one. The local mean temperature showed the uniform distributions for lower pressure index, which increased with increasing equivalence ratio. The mean
chemiluminescence intensity, showed high level for lower pressure index for
conditions. EINOx decreased with decreasing pressure index for overall equivalence ratio conditions.
Flame Dynamic Response to Inlet Flow Perturbation in a Turbulent Premixed Combustor
Kim, Dae-Sik ;
Journal of the Korean Society of Combustion, volume 14, issue 4, 2009, Pages 48~53
This paper describes the forced flame response in a turbulent premixed gas turbine combustor. The fuel was premixed with the air upstream of a choked inlet to avoid equivalence ratio fluctuations. To impose the inlet flow velocity, a siren type modulation device was developed using an AC motor, rotating and static plates. Measurements were made of the velocity fluctuation in the nozzle using hot wire anemometry and of the heat release fluctuation in the combustor using chemiluminescence emission. The test results showed that flame length as well as geometry was strongly dependent upon modulation frequency in addition to operating conditions such as inlet velocity. Convection delay time between the velocity perturbation and heat release fluctuations was calculated using phase information of the transfer function, which agreed well with the results of flame length measurements. Also, basic characteristics of the flame nonlinear response shown in the current test conditions were introduced.