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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 6, Issue 2 - Sep 1997
Volume 6, Issue 1 - May 1997
Selecting the target year
Evalution of Introduction of Electric Vehicles in the City
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 115~118
An Analysis of Unsteady 2-D Heat Transfer of the Thermal Stratification Flow inside Horizontal Pipe with Electrical Heat Tracing
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 119~128
A method to mitigate the thermal stratification flow of a horizontal pipe line is proposed by heating external bottom of the pipe with electrical heat tracing. Unsteady two dimensional model has been used to numerically investigate an effect of the external heating on the thermal stratification flow. The dimensionless governing equations are solved by using the control volume formulation and SIMPLE algorithm. Temperature distribution, streamline profile and Nusselt number distributions are analyzed under heating conditions. The numerical results of this study show that the maximum dimensionless temperature difference between hot and cold sections of the inner wall of pipe is 0.424 at dimensionless time of 1,500 and the thermal stratification phenomenon disappears at about dimensionless time of 9,000.
Analysis of Economic Load Dispatch for the Atmospheric Emission Control in Power Systems
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 129~136
This paper presents a new economic load dispatch considering atmospheric emissions such as NOx and SO
caused by the operation of fossil-fueled thermal generation in power systems. The proposed method is described for scheduling their output of thermal power units so as to comply with total emission constraint, area emission constraint and the both of those constraints. Also, by using a trade-off curve, representing all dispatch alternatives and conflict between the emission and the fuel cost, the sensitivity analysis of the emission and the fuel cost is applied to this algorithm. By the way, this proposed method is analyzed how dispatch changes as a function of the total environmental cost, and as a function of the relative weighting of individual environmental insults, e.g, NOx and SO
. By applying the proposed method to the system, the usefulness of this method is verified.
Numerical Analysis of Turbulent Swirling Cold-Flow in a Cyclonic Coal Gasifier
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 137~144
Turbulent swirling cold-flow in a cyclonic gasifier has been analyzed by numerical analysis. Comparison of two dimensional and three dimensional analyses has shown that concept of equivalent slit is appropriate for the two dimensionalization of three dimensional phenomena. Flow characteristics have been scrutinized by varying swirl number which is a crucial parameter in determining the flow pattern of the cyclonic gasifier. Reactive flow field has been estimated by using theoretical swirl number and equivalent slit width for reactive flow. Results show that proper flow field for the reactive coal gasification can be formed by controlling the exit area and azimuthal location of coal burners.
An Analysis of the R&D Investment Efficiency in Power Industry
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 145~151
The R&D investment of power industry has significant influences on the social welfare as well as national economy. It is necessary to analyze how efficient the R&D investment has been performed. The objective of this study is to verify the efficiency of the R&D investment in the domestic power industry. A formula was introduced to by calculate the appropriate amount of R&D investment of monopolistic industry under the regulations which are determined by the proportion of R&D elasticity and price elasticity. It has resulted that there would be no economy of scale as the sales of electricity increases at the same rate of the increasing cost. The R&D investment in the present electricity industry has been performed inefficiently by showing the negative impact on price-cost margin of the intensity of R&D investment, which is the extent of R&D investment to reinforce economy of scale.
A Study on Heat Transfer Model in a Coke Oven Using Blending Coals
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 152~161
Blending various coals during the coke making process affects the quality of coke as well as the total energy required for the process. The mathematical model based on Merrick's work developed to predict the effect of blending coals on coke making process. The Crank-Nicholson method was used to solve the model equation to predict temperature distributions, a coking time, and a total energy required during the process. The developed model successfully applied to Kwang-Yang Steel Company's coke oven to validate the model performance. It is hoped that the model can serve as a guidelines on how to blend coals during the process.
The Effect of Particle Size on Combustion Characteristics of Pulverized High-Volatile Bituminous Coal
Kim, Hyung-Taek ; Jeon, Heung-Shin ; Wongee Chun ;
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 162~169
The particle size effect on the combustion characteristics of pulverized coal was investigated in the cylindrical-shape, horizontal furnace, fired in the range of 8.8∼10.6 kw. Three differently-sized fractions (5, 30, and 44 microns in average diameter) of high-volatile bituminous coal, were burned in the test furnace. Burnout behavior of pulverized coal flame were determined through the measurement of stable species concentrations (CO
O). Concentrations of CO
were compared with the theoretical values and the result showed good agreement. Thermal behavior of pulverized coal flame were determined as maximum flame temperatures occurred at fuel-rich conditions in every case. Flame lengths were also determined by decreasing with the particle size decrease. The flame length of the fine sized coal sample was comparable to that produced by distillate oil. The color of the coal flames ranged from orange to yellow, with the flame of the fine size fraction being brighter and yellower than the others.
An Experimental Study on the Level Control of the Steam Generator in Nuclear Power Plant
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 170~175
An experimental study was carried out with the Mock-up made for the improved water level control of the steam generator in nuclear power plant and for the confirmation of swell/shrink status of the water level by opening and closing the steam dump valve. We can confirmed the possibility of using the Mock-up by introducing the PI controller and the FUZZY controller. Accordingly, we can confirmed that the practical usability of advanced controllers, which will be developed for the improved water level control of the steam generator in nuclear power plant by using the Mock-up.
Performance Evaluation of IGCC Plants with Variation in Coal Rank and Coal Feeding System
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 176~187
As a way to evaluate the performance of IGCC (Integrated Gasification Combined Cycle) processes, heating values of coal gas as well as plant efficiency were compared for different rank coals and coal feeding methods by employing the static process simulation technique. Performance of the process was compared with coal rank that was varied by three assorted bituminous coals and also by three subbituminous coals, in addition to the two types of feeding techniques, i.e., dry-feeding and slurry-feeding, that are utilized in entrained-bed coal gasifiers. For the verification of the simulation technique, simulated results were compared first with the actual pilot plant data published from Shell and Texaco. The simulation technique was, then, applied to other coals. Result from tests varying coal rank exhibits the trend of improving both heating content of the product gas and plant efficiency with increasing carbon content in coal. The effect of coal rank is more sensitive in slurry-feeding cases compared to the dry-feeding cases. In particular, considering notably lower values in gas heating value and plant efficiency calculated in the slurry-feeding case that uses a subbituminous coal, limited utilization of the slurry-feeding method for subbituminous coals can be expected. From the plant efficiency point of view, dry-feeding method resulted in higher simulated efficiency values by maximum 3% for subbituminous coals and ca. l% for bituminous coals.
A Study on the Model for Iron and Steel Technology Assessment Considering Cost Minimization and Environmental Effects : An Application of MARKAL Model
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 188~197
MARKAL model was applied for assessment of iron and steel technology for the year of 2032 considering cost and environmental effects based on 1992. Technology, energy and material flows were analyzed in iron and steel sector. Reference iron and steel system was designed according to this analysis. Six scenarios were developed considering cost and environmental limitations such as CO
emission control and SOx reduction cost. Competitiveness of technologies in iron and steel sector was assessed under different environmental limitations with cost minimization. Through this study, it was confirmed that MARKAL model can be applied to technology assessment in the field of iron and steel industry.
Oxidation Behavior of UO
in Air at 300~55
Kang, Kweon-Ho ; Hwang, Suk-Youl ; Kim, Kil-Jeong ;
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 198~202
The oxidation behavior of UO
pellets was studied using a thermogravimetric analyzer and an XRD in the temperature range of 300 to 550
in air. From XRD studies it is found that UO
is converted to U
8/ and the weight gains of UO
specimen are characterized by S-shape curves. After complete oxidation the specimens broke into fine powder and the average weight gain was about 3.93 wt%. The activation energy of 50% conversion of UO
8/ is 81.6 kJ/mol and the oxidation rate per unit time was found to be as follows dw/dt=6.54
6/ e (equation omitted), wt%/h : at 50% conversion of UO
8/ where w, t and T were wt% gain, conversion time and temperature, respectively.
A Study on the Separation of
from Flue Gas by Chemical Absorption
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 203~211
This study is on the separation of Global warming effect gas, CO
by chemical absorption from mixture of CO
which was modeled after flue gas of fire power plant. Investigation of optimum condition for absorbent was carried out by using sparged vessel apparatus. Through packed tower experiments, applicabilities of two absorption models were tested by comparing experimental results with theoretical values. Absorbent used in the experiments was Monoethanolamine (MEA) and gas mixture was made in the mole composition of 15% CO
and 85% N
. Through estimations of CO
loading and CO
removal efficiency, optimum concentration of absorbent was found in the range of 4-5 M. To find a rate of absorption, an enhancement factor was introduced. Values of rate of absorption were calculated by Film model and Higbie model, respectively. Higbie model showed good agreement with experimental results. Therefore, this models is considered to be applicable to the CO
separation process for flue gas from fire power plant.
A Study of the DI Diesel Engine Using Light Diesel-Water Emulsified Fuel with Ultrasonic Apparatus - Effect of Water Content on Engine Performance and Exhaust Gas Characteristics -
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 212~219
The objective of this study is to investigate the effects light diesel-water emulsified fuel on performance and exhaust emissions of the compression ignition engine. The experimental results of light diesel-water emulsified fuel operation with new type ultrasonic emulsification apparatus as compared with light diesel operation are very positive; maximum 28% reduction of SFC (in the case of 30% of water content), maximum 60% reduction of smoke (in the case of 30% of water content), maximum 79% reduction of CO emission (in the case of 30% of water content). However, comparing light diesel-water emulsified fuel and light diesel in the same engine under the same operating conditions, power and torque were lower in the case of emulsified fuel. In view of the results for the above mentioned, the mixing of water into light diesel in the form of emulsification proved to be the best means for reduction of specific fuel consumption and exhaust emissions of C.I. engines.
A Study on The ′Doughnut Effect′in Siting A Nuclear Waste Repository
Journal of Energy Engineering, volume 6, issue 2, 1997, Pages 220~229
Siting a nuclear waste facility in a specific area, the public show some different attitudes for newly suggested nuclear facility as a function of distance from the existing facilities, namely 'Doughnut Effect'. This Doughnuts Effect indicates not only indirect public assessment for the existing facilities, but transition of public attitude between socio-economic expectation and risk perception. Ulchin area was selected as a case study model and the possibility to success in siting a nuclear waste facility in that area was shown. Thus, availability of the 'Doughnut effect'as a prestudy for siting radioactive waste disposal facilities was practically suggested.