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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
Effect of Pilot Injection on Combustion and Exhaust Emissions Characteristics in a Biodiesel Fueled Diesel Engine
Jeong, Kyu-Soo ; Lee, Dong-Gon ; Roh, Hyun-Gu ; Lee, Chang-Sik ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 1~7
The purpose of this study was to analyze the effect of pilot injection strategy on the combustion and emissions characteristics in a four cylinder common-rail direct injection diesel engine fueled with biodiesel(soybean oil) blend. The tested fuel was mixed of 20% biodiesel and 80% ULSD(Ultra low sulfur diesel) by volume ratio. The experiments were performed under two load conditions, and results were compared with those of single injection. The experimental results showed that the ignition delay of BD20 was shorter than compared to that of ULSD in the case of low load condition. Also, the fuel consumption of BD20 was more higher than that of ULSD. Fuel consumption by applied pilot injection strategy were generally decreased compared with that of single injection. In the case of pilot injection, the exhaust emissions such as CO and HC emissions were decreased compared to the single injection.
Experimental and Numerical Study on the Gas Mixing and Reaction in the Freeboard of a Fluidized Bed Incinerator for Sludge Treatment
Kim, Young-Min ; Shin, Dong-Hoon ; Hwang, Seung-Sik ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 8~15
The present study investigates the combustion phenomena in a sludge incinerator using experimental and numerical method. The temperature and gas concentration were measured at 33 points during operation of the incinerator in order to assess the mixing and combustion characteristics. Numerical simulation was also carried out using a commercial CFD code. Simplified inlet conditions were introduced in oder to predict the bulk solid combustion and the diffusion of the volatile matter released by pyrolysis of sludge. The experimental results showed that the combustion process is extremely inhomogeneous. Large variations were observed in the temperature and gas concentrations in the freeboard of the incinerator due to poor mixing performance between the air and the combustibles, which is caused by massive and bulk generation of volatile matter by fast pyrolysis of sludge particles. The boundary condition of the CFD simulation was found effective in predicting the poor mixing and combustion performance of the reactor.
Comparative Evaluation of Thermal Design Parameters of Different Sizes of Circulating Fluidized Bed Boiler
Kim, Tae-Hyun ; Choi, Sang-Min ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 16~22
The present paper discusses thermal design parameters of different sizes of circulating fluidized bed (CFB) boilers with capacities ranging from 2 MWe pilot scale boiler to a 600 MWe utility boiler. Physical boiler size and shape of furnace were identified and dimensional data have been summarized. By performing thermal design for each of the boilers, heat transfer surface area, furnace shape and size, and allocation of heat transfer surface for water-steam side heat absorption have been recalculated, and presented. Although boilers may have significantly different capacity, the facilities have common design parameters, when they are evaluated as basic thermal design processes. The significance of thermal design procedure is explicitly discussed.
Process Modeling of an Iron Ore Sintering Bed for Flue Gas Recirculation
Ahn, Hyung-Jun ; Choi, Sang-Min ; Cho, Byung-Kook ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 23~30
In the iron and steel manufacturing, sintering process precedes blast furnace to prepare feed materials by agglomerating powdered iron ore to form larger particles. There are several techniques which have devised to improve sintering production and productivity including flue gas recirculation(FGR) and additive gas enriched operation. The application of those techniques incurs variations of process configurations as well as inlet and outlet gas conditions such as temperature, composition, and flow rate which exert direct influence on reactions in the bed or the operation of the entire plant. In this study, an approach of sintering bed modeling using flowsheet process simulator was devised in consideration of FGR and the change of incoming and outgoing gas conditions. Results of modeling for both normal and FGR sintering process were compared in terms of outgoing gas temperature, concentration, and moisture distribution pattern as well as incoming gas conditions. It is expected to expand the model for various process configurations with FGR, which may provide the usefulness for design and operation of sintering plant with FGR.
A Study on Combustion Characteristics of Synthetic Gas Air Lifted Premixed Flames with High Strain Rate in an Impinging Jet Combustion Field
Kang, Ki-Joong ; Park, Tae-Joon ; Hwang, Cheol-Hong ; Lee, Kee-Man ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 31~37
This paper presents both experimental and numerical investigation of the combustion characteristics of stretched premixed lift-off flames using synthetic gas(
/CO) in an impinging burner. We used "Spin code" for numerical analysis. An ICCD camera was employed to measure flame location and flame thickness. The impinging surface temperature was affected by local strain rate K, equivalence ratio, and composition ratio of fuel. In spite of the difference of boundary conditions in experimental and numerical results, the tendencies of surface temperatures were agreed. From result of this work, we also found that flame location and flame thickness directly related to surface temperature are greatly affected by local strain rate K.
Numerical Investigations on Laminar Flame Speed of Syngas Flames at IGCC Gas Turbine Condition
Lee, Jeong-Won ; Oh, Kyung-Taek ; Kim, Yong-Mo ;
Journal of the Korean Society of Combustion, volume 16, issue 4, 2011, Pages 38~45
Coal-derived syngas has been utilized by main fuel at IGCC power plant. Research efforts for investigating the characteristics of premixed and nonpremixed flames at gas-turbine condition have been conducted. The present study has been mainly motivated to evaluate the capability of the detailed chemical kinetics to predict the syngas laminar flame speed. Special emphasis is given to the effects of pressure, temperature, syngas composition, and dilution level on the characteristics of premixed and nonpremixed flames. The predicative capability of a number of detailed mechanism for laminar flame speed is compared to experimental data. From these results, detailed kinetics of Davis et al. and Li et al. have the best conformity with the experiments in the all the case of parametric studies.