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자료유형
학술대회자료
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저널정보
한국신재생에너지학회 한국신·재생에너지학회 학술대회 초록집 한국신재생에너지학회 2008년도 추계학술대회 논문집
발행연도
2008.10
수록면
230 - 233 (4page)

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The vanadium rich ash of petroleum coke can give a slagging problem during because of the high melting point of V₂O₃. For continuous removal of the slag, petroleum coke is often mixed with coal, and the viscosity of the mixed slag is an important property, determining the gasification temperature. The viscosities of the mixed slag from various mixing ratios of petroleum coke and a bituminous coal were investigated. When mixed with a crystalline coal slag, T_{cv} was increased at a higher the coke content in the mixed feed. When the V₂O₃ concentration was greater than 4.5%, it was difficult to get accurate measurements of T_{cv}. The SEM/EDX analyses of the cooled slag revealed that the major crystalline phase was anorthite, and T_{cv} should be related to the formation temperature of anorthite. The SEM/EDX analyses also showed that, at low concentrations of vanadium, part vanadium formed a crystalline phase with Al-Si-Ca-Fe, and the rest remained in the glassy phase, suggesting that vanadium existed as a slag component at the low viscosity region. At a high concentration, vanadium forms a phase with Ca, and the Ca-V phase was separated from the slag phase, and formed a layer above the slag. FeO in petroleum coke also played an important role determining viscosity: at high temperatures, increased FeO lowered the viscosity, but as it formed a spinel phase, the depletion of FeO in the slag resulted in a higher viscosity.

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