• Proceedings of the KSME Conference
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• 2004.11a
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• pp.1184-1189
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• 2004

Coking process is the thermal decomposition of bituminous coal with final temperature of about $900^{\circ}C$ Because coke plays important roles in ironmaking process in a blast furnace it's essential for developing modeling of coke oven. In this study, An unsteady 2-dimesional model is proposed to simulate coking process in a coke oven. In this model, gas and solid phase are assumed homogeneous continnum and solid bed is assumed as porous media . The model contains governing equations for the solid phase and the gas phase. Complicated phenomena such as swelling, softening, resolidification and shrinkage are neglected and mass loss by drying and devolatilization is reflected by generation of internal pores. Drying, devolatilization, heat transfer and generation of internal pores are also reflected in source terms. Calulated results are compared with experimental data

• Journal of Energy Engineering
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• v.6 no.2
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• pp.152-161
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• 1997

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.

• Journal of Yeungnam Medical Science
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• v.4 no.1
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• pp.139-143
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• 1987

The clinical picture and CSF findings in cryptococcus meningitis may be identical with those of tuberculous meningitis. The differential diagnosis can be made by finding the budding yeast organism in the counting chamber or in stained smear, the detection of cryptococcal antigen in CSF by the latex agglutination test, and by culture of the fungus on Sabouraud agar. We experienced a case of cryptococcal meningitis in the 48 years old woman, which was confirmed by Indian ink preparation and culture.

• Resources Recycling
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• v.2 no.4
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• pp.10-16
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• 1993

Reduction behavior of stainless steelmaking dust by microwave heating process was investigated using coke and charcoal as reducing agents. Pellet dust and stanless steelmaking dust pelletized with reducing agent were reduced by the heating upto $1000^{\circ}C$ in microwave oven. The results showed that charcoal and coke seemed effective in the reduction of metals from stainless steelmaking dust by microwave heating and charocal was found to be better than coke. Degree of reduction seemed similar with the power of 500W and 700W in microwave oven. Dusts were rapidly reduced within 20 minutes. Reducing degree decreased in the order of Fe>Ni>Cr.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.5
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• pp.697-701
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• 2012

Numerical modeling for a coke dry quenching process was developed and evaluated. The cokes had similar characteristics to a porous material, therefore, its quenching analysis was simplified as a cooling process of porous blocks. A uniform inlet temperature and constant properties of materials in the oven were also assumed. With given operating conditions, temperature profiles in the cokes were calculated and compared to the actual values. The calculated temperature gradient was high at the upper part of the coke flow and the cooling rate decreased as cokes came down to the exit port. The exit port temperature of cokes was similar to the measured value, however, temperature-dependent material properties and operating conditions must be considered to predict the temperature precisely. The calculated results could be applied to design a coke oven to produce high quality cokes.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.04a
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• pp.115-119
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• 2002

석유를 이용한 시설원예 난방이 90%를 넘고 있으며, 최근 유가의 불안정으로 시설원예 난방비 비중이 30%를 이상을 차지하고 있어 대체에너지를 이용한 난방비 절감기술이 절실하다. 현재 시설원예 면적은 약 52,189ha(채소, 화훼포함)이며, 이중 난방면적은 13,621ha로 전체 면적의 26%가 난발비의 부담을 안고 시설재배를 하고 있다. 이에 단위 열량당 연료비가 비교적 저렴한 코크스를 이용하는 난방기 중 온풍기를 개발하여 시설원예 난방비를 절감코자 본 연구를 수행하였다. (중략)

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.345-346
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• 2014

• Applied Chemistry for Engineering
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• v.28 no.4
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• pp.432-436
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• 2017

Carbon blocks were prepared by compression molding process using the mixture of isotropic cokes and binder pitches, which were reformed with different ${\beta}$-resin contents from pyrolysis fuel oil. Physical and chemical properties and also thermal behavior of binder pitches were investigated through elemental analysis, FT-IR and thermogravimetric analysis, respectively. The adhesion of binder pitches to isotropic coke particles was evaluated from SEM images of the fracture surface of carbon blocks. From these results, it is shown that the adhesion between the cokes and binder was enhanced by increasing the ${\beta}$-resin content of binder pitches. The density of the carbon block after carbonization also increased from 1.325 to $1.383g/cm^3$ by increasing the ${\beta}$-resin content of binder pitches from 1.4 to 20.1%.

• Journal of the Korea Concrete Institute
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• v.20 no.3
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• pp.369-374
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• 2008

Two types of conductive materials are selected and their applicable properties are investigated so as to give the capability of self-diagnosis of fracture in composite mortar, concrete and reinforced concrete. In this study, for giving selfdiagnosis capability, the powder of cokes and milled carbon fiber as conductive materials are selected and intermixed with mortar, concrete and reinforced concrete. After examining change in the value of electric resistance before and after the occurrence of cracks at each flexural load-stage in composite mortar, concrete or reinforced concrete, the relationships of each factors (electric resistance, crack and flexural load) are analyzed. As the results, it can be recognized that conductive materials with powder of cokes and milled carbon fiber can be applied for self-diagnosis of flexural fracture in composite mortar, concrete and reinforced concrete specimen.

• Analytical Science and Technology
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• v.11 no.3
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• pp.156-160
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• 1998

SiC is synthesized by sol-gel and carbothermal reaction method from various carbon sources and Si source and characterized through the results of DSC and XRD. More SiC has been formed in carbothermal reaction than sol-gel method. From the XRD results, the degree of formation of SiC increases in the order of petroleum cokes, activated carbon, artificial graphite all in two introduced methods. Based on the DSC data, the enthalpy values for the exothermic reaction decrease in the order of activated carbon, petroleum cokes, artificial graphite in carbothermal reaction methods, while those for the endothermic reactions increase in the reverse order. But, the enthalpy values for the exothermic reactions decrease in the order of petroleum cokes, activated carbon, artificial graphite in sol-gel methods.