• Title, Summary, Keyword: cokes

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Modeling for a Coke Dry Quenching Process Using a Theory of a Porous Material (다공질 물질의 냉각현상 연구를 통한 코크스냉각공정의 모델링)

  • Kim, Joo-Han;Lee, Yong-Ju;Kim, Ki-Seok
    • 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.

Graphitization of Petroleum Cokes by Aluminum Catalyst (Aluminum 촉매에 의한 석유 Cokes의 흑연화)

  • 염희남;김경자;정윤중
    • Journal of the Korean Ceramic Society
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    • v.32 no.6
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    • pp.677-684
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    • 1995
  • The effect of catalytic graphitization of petroleum cokes by the addition of aluminum were investigated. The degree of graphitization carbon body only fired at 230$0^{\circ}C$ was 0.5. But when the aluminum additive was added, the degree of graphitization was increased to 0.93. And Ts-effect was appeared as the catalytic effect. This effect was occurred by the formation-decomposition of aluminum carbide through the reaction of aluminum and cokes.

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Effect of Addition of Boron Carbide on the Graphitization and Oxidation Resistance of Raw Cokes (Raw Cokes의 흑연화 및 내산화성에 미치는 $B_4C$첨가 효과)

  • 염희남;김경자;김인기;정윤중
    • Journal of the Korean Ceramic Society
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    • v.34 no.4
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    • pp.413-419
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    • 1997
  • The specimens which were prepared from cokes with additions of 0~25 wt% B4C were sintered in Ar atmosphere at 220$0^{\circ}C$. The effects of B4C content on graphitization and oxidation resistance of cokes were investigated. B4C accelerates the graphitization of cokes and at 220$0^{\circ}C$ the degree of graphitization increased from 0.33 which is the value of pure carbon to 0.56, which increased bluk density and porosity. Especially bending strength increased as th graphitization temperature increased. Oxidation resistance property was greatly improved when B4C was added more than 10wt% at 80$0^{\circ}C$ and when B4C was added more than 20wt% at 100$0^{\circ}C$. This was because that the thin layer of B2O3 glass phase on the surface of the composite could be identified to increase the oxidation resistance.

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Preparation and Characterization of Pitch/Cokes Composite Anode Material for High Power Lithium Secondary Battery

  • Yu, Lan;Kim, Ki-Jung;Park, Dae-Yong;Kim, Myung-Soo;Kim, Kab-Il;Lim, Yun-Soo
    • Carbon letters
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    • v.9 no.3
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    • pp.210-217
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    • 2008
  • Petroleum pitch and coke with wet mixture method or with dry mixture method were investigated to develop the composite anodic carbon material of high power lithium ion battery. Cokes coated with pitch were obtained by the heat treatment of mixture of cokes and pitch with different weight ratios at $800{\sim}1200^{\circ}C$. The charge and discharge characteristic of the consequent composite anodic carbon material assembled in batteries was tested. Cokes with wet mixture method have a smooth surface and their capacity changed little with changing temperature and content as compared to the cokes with dry mixture method. Although the reversible capacities showed different values by the anode manufacturing method, the composite anode with the mixture of 20 wt% of petroleum pitch and 80 wt% of coke showed the higher power capability and initial efficiency than the pitch based anode. However, the reversible capacity of the composite anode showed the reduced value as compared with the pitch based anode.

Properties Changes of Cokes and Forming Bodies Derived from Them during Artificial Graphite Manufacturing (인조흑연 제조공정중의 코크스와 그 성형체의 물성변화)

  • Gwon, Yeong-Bae;Kim, Hong
    • 한국기계연구소 소보
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    • pp.105-114
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    • 1990
  • The relationship between the properties of two kinds of calcined cokes and graphitized forming bodies were examined. The microstructures of the forming bodies are already determined to some degree at the stage of baking. Calcined cokes as well as baked forming bodies using the same coke as filler were heat treated at various temperatures and their structural and properties changes with heat treated temperature were studied. The transition in properties changes with heat treatment in forming bodies were observed around $2000^{\circ}C$. The characteristics of the finial graphite bodies are strongly dependent on the properties of the raw material cokes.

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A Study on the Increasement of Strength about Soft ground improvement material using waste residual by fire (소각잔재물을 활용한 연약지반개량재의 강도증진에 관한 연구)

  • Lee, Kwang-Joon;Lee, Jae-Yeol
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.692-697
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    • 2004
  • This study is on the increasement of strength about soft ground improvement material using waste residual(paper fly ash, coke ash, slag) by fire. Through this study the authors have analyzed the strength improvement of mixed soft silty sand with improvement materials. The strength of mixed soils with high mixture ratio and more curing days increased. But CA-30(cokes 60%) make more low strength improvement than others. Therefore the authors find out that paper fly ash+cokes, paper fly ash+slag or cokes+slag improvement material is more effect in improvement of soft silty sand than cokes+cenlent. And Ettringite reaction is free mixed soils with more than two materials.

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Tribological Properties of Carbonaceous Ingredients such as Natural Graphite, Artificial Graphite, and Cokes in Automotive Brake Friction Materials

  • Kim, Yoon-Jun;Lee, Kang-Sun;Park, Sung-Bin;Jang, Ho
    • KSTLE International Journal
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    • v.10 no.1_2
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    • pp.43-47
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    • 2009
  • Influences of carbonaceous ingredient as a solid lubricant in automotive friction materials on friction properties were studied. Three types of carbonaceous ingredients such as natural graphite, artificial graphite, and cokes were mixed using a constrained mixture design. A 1/5 scale brake dynamometer was used to obtain tribological properties. Results showed that cokes substantially increased the friction coefficient, and natural graphite effectively reduced stick-slip phenomena. This significant difference was attributed to the formation of the friction film on the brake pad which was shown to be strongly dependent on the graphite types. The different crystal structures of the carbonaceous solid lubricants played a significant role in the formation of friction film at the interface.

Influence of Properties on Carbon Solid by Preheat-treatment Temperature (Raw Coke 전처리 온도에 따른 경질 탄소재의 물성 영향)

  • 황인수;염희남;장진석;이종민;송종택
    • Journal of the Korean Ceramic Society
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    • v.30 no.7
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    • pp.557-562
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    • 1993
  • Following conclusions are made from the detalied research on the relation between the phase change of the petroleum raw cokes after ball milling and the preheat treatment temperature. The petroleum raw cokes species are preheated in the temperature range of 350~45$0^{\circ}C$. At the preheat treatment temperature of 40$0^{\circ}C$ the particles of petroleum raw cokes from ball milling become spheically shape with the almost uniform particle size distribution of 1~5${\mu}{\textrm}{m}$. At the same temperature, they became low-graphitized with the d0.02 X-ray diffraction index of 3.41$\AA$. The carbon material made from the petroleum raw cokes at 40$0^{\circ}C$ turned out to have the good modulus of rupture about 600kg/$\textrm{cm}^2$, with the bulk density around 1.8g/㎤ and the appearent porosity around 8%.

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Properties of Shrinkage Reducing Agent and Mortar with C12A7-based Slag and Petroleum Cokes Ash (C12A7계 슬래그와 석유 코크스 연소재를 사용한 수축저감재 및 모르타르의 특성)

  • Chu, Yong Sik;Park, Soo Hyun;Seo, Sung Kwan;Park, Jae Wan
    • Journal of the Korean Ceramic Society
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    • v.50 no.5
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    • pp.319-325
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    • 2013
  • In this study, petroleum cokes ash and $C_{12}A_7$-based slag were used for the shrinkage reduction and strength enhancement of mortar. The hydration properties of shrinkage reduction agents were analysed. The flow, change of length and compressive strength were experimented with mortar-added shrinkage reduction agents. As a result of this study, petroleum cokes ash : $C_{12}A_7$-based slag = 60~80% : 20~40% showed excellent results. In the case of mortar with 20% $C_{12}A_7$-based slag, the setting time and change of length were similar to Ref. mortar. The flow and compressive strength were superior to Ref. mortar. In the case of mortar with a 40% $C_{12}A_7$-based slag, the setting time was longer than Ref. mortar. The compressive strength of 3 days and 7 days were superior to Ref. mortar.