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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2009
Volume 18, Issue 3 - Sep 2009
Volume 18, Issue 2 - Jun 2009
Volume 18, Issue 1 - Feb 2009
Selecting the target year
An Experimental Study on the Fry Drying of Low-rank Coal with a High Moisture Content
Moon, Seung-Hyun ; Kim, Yong-Woo ; Ryu, In-Soo ; Lee, Seung-Jae ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 213~220
The experimental characteristics for fry drying method was investigated using low-rank coal with a high moisture content. Final temperature, mixing ratio between coal and kerosene, content of coal or kerosene, total weight of the mixture and mixing methods were varied to find out the optimum conditions by measuring moisture of coal. Evaporation of the coal moisture was not completed below
of final temperature. The amount of moisture was not significantly different over
. Coal moisture was easily evaporated by increasing coal content, which showed that the moisture evaporation could be significantly enhanced by the remove of evaporated moisture from kerosene rather than by heat transfer to the coal. High total weight of the mixture resulted in lowering moisture content of coal with long evaporation time. On the other hand, low total weight was difficult to reduce the moisture below a certain level, but could reduce evaporation time. Thus, it can concluded that kerosene content should be lowered to the extent maintaining the mobility of the mixture in order to enhance evaporation. It was also observed that evacuation and mixing by using nitrogen could improve drying of coal.
Development and Economic Effect of Integrated Optimum Operation System using Wide Area Energy
Lee, Hoon ; Kim, Lae-Hyun ; Chang, Won-Seok ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 221~229
This study develops the optimized operation program which enables effective and economic operation between individual and connected branch offices by analyzing the current status and influential indicators of district heating companies' capital branch offices. Accordingly, the study examines the efficiency of optimized operation program. In doing so, this study has diagnosed and analyzed various factors, such as boilers, pumps, and relevant tags (temperature, pressure, fuel amount) through investigation of individual branch offices, and finally succeeded in developing wide-ranging data base by factor covering one-year time period. Additionally, after running the optimized operation program, different branch offices, optimum preference has turned out "incinerator receiving heat from KEPCO>CHP >PLBs>PLBw." Meantime, except the connected offices, there has been no big difference between actual and optimum operation program in branch offices. Meanwhile, the integrated optimum operation program has made it possible the most optimal result only via the connecting supply and demand heat without changing received Heat from KEPCO which is the same as total productive heat. The result has showed that the reduction percentage per day is 2.45~6.80%, and the reduction cost per day is 22,727~60,077 thousand won given the randomly selected sample days. In particular, winter time shows the highest demand with the largest reduction cost whereas summer time illustrates the lowest demand with the smallest reduction cost. Given this result, reduction cost per year compared to actual heat production cost for one year theoretically would be 84 hundred million won. Also, the economic effect showed that the reduction cost percentage per year is more than 2.74% on heat production cost per year for all capital branch offices.
Study of fuel cell CHP-technology on electricity generation sector using LEAP-model
Shin, Seung-Bok ; Jun, Soo-Young ; Song, Ho-Jun ; Park, Jong-Jin ; Maken, Sanjeev ; Park, Jin-Won ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 230~238
We study about small gas engine and fuel cell CHP (Combined Heat and Power) as the technologies for energy conservation and
emissions reduction. Korea government plans to use them in near future. This study quantitatively analyzed energy consumption and
emissions reduction potential of small CHP instead of existing electric power plant (coal steam, combined cycle and oil steam) using LEAP (Long-range Energy Alternative Planning system) as energy-economic model. Three future scenarios are discussed. In every scenario similar condition for each CHP is used. Alternative scenario I: about 6.34% reduction in
emissions is observed in 2019 due to increase in amount of gas engine CHP and fuel cell CHP while coal use in thermoelectric power plant is almost stagnant. In alternative scenario II: a small 0.8% increase in
emission is observed in 2019 keeping conditions similar to alternative scenario I but using natural gas in combined cycle power plant instead of coal. During alternative scenario II overall
emission reduction is observed in 2019 due to added heat production from CHP. Alternative scenario III: about 0.8% reduction in
emissions is observed in 2019 using similar CHP as AS I and AS II. Here coal and oil are used in thermoelectric power plant but the quantity of oil and coal is almost constant for next decade.
A Experimental Study of Oxidation Kinetics for a Sub-Bituminous Coal Char
Kang, Ki-Tae ; Song, Ju-Hun ; Lee, Chuen-Sueng ; Chang, Young-June ; Jeon, Chung-Hwan ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 239~246
A fundamental investigation has been conducted on the combustion of single particle of a sub-bituminous coal char burning at different temperatures and residence times. The lab-scale test setup consisted of a drop tube furnace where gas temperatures varied from
. A calibrated two color pyrometer, mounted on the top of the furnace, provided temperature profiles of luminous particle during a char oxidation. An amount of char mass reacted during the reaction is measured with thermogravimetry analyzer by using an ash tracer method. As a result, mass and area reactivity as well as reaction rate coefficients are determined for the char burning at atmospheric pressure condition.
Evaluation of Industry-specific Sectoral Approach in the Climate Change Framework
Han, Jin-Hyun ; Yoo, Dong-Heon ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 246~257
Regarding climate change, the most significant challenge the world faces is achieving the goal of stabilizing the global concentration of greenhouse gases. However, this cannot be accomplished by greenhouse gas reduction efforts of developed countries alone. In this context, a "sectoral approach" has been brought up as a way to overcome the limit of the Kyoto Protocol and induce the participation of developing countries. This paper focuses on the different types of sectoral approaches that have been suggested so far, and their criteria, scope and effectiveness. It therefore explores the potential each approach has as a policy alternative under the post-2012 scheme. On top of that, with the possibility of these sectoral approaches becoming strong future policy alternatives in mind, this paper also analyzes their applicability to the Korean industry. For the steel, petrochemical and oil industries - in which energy efficiency exceeds the world average- a technology-based approach is proposed as an alternative. For the cement, paper and power generation industries - in which energy efficiency is about the same as the global average - a sectoral crediting mechanism or an index-based approach or a sector-wide transnational approach are proposed as alternatives. Lastly, this paper suggests a future research direction for their adoption and implementation.
Two-Phase Jet Flow Characteristics in the Pure Oxygen Aeration System Using Two-phase Jet Nozzle
Jung, Chan-Hee ; Lee, Kye-Bock ;
Journal of Energy Engineering, volume 18, issue 4, 2009, Pages 258~263
Jet Loop Reactor(JLR), in which a two-phase nozzle is installed, is the new design technique for the treatment of high concentration wastewater by accelerating of oxygen contacting between substrate and surrounding bacteria. This numerical study of the two phase jet flow was conducted to find the optimum design of JLR. It was shown that there was a minimum velocity in the nozzle for continuous circulation of wastewater. The optimum location and the size of the draft tube for continuous circulation were examined. It was certain that the smaller the air size is, the more the effect of the mixing increases. The relation between the mixing effect and the turbulence was confirmed.