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정석광,정원섭,백찬영 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.10
It were investigated on the analytical solution based on Coulomb-Mohr circle and the solid flow in the blast furnace using a scale model. According to the experimental result, solid flow in the blast furnace could be divided into two regions that is mass flow over the belly, funnel flow under the upper belly. The analytical solutions that contained the average vertical stress, horizontal stress and wall stress were obtained by the plastic yield condition used in soil mechanics. The analytical calculation results corresponded well to the measured one over the belly. According to the analytical solution, the ratio of horizontal stress to average vertical stress turned over at the belly part, and such abrupt change of stress distribution caused mass flow to shift funnel flow.
정석광,정원섭,백찬영 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.10
It was constructed a mathematical model for burden distribution in the blast furnace that was consisted of the calculation of burden trajectory, optimization of burden descending velocity suitable for estimating the real base line and adoption of plural inclination angle of coke layer. It was confirmed that this mathematical model could represented the real ratio of ore to coke layer thickness. Although the particle size distribution in the radial direction was assumed to be constant because it depend mainly on the charging system, the calculated gas velocity distribution based on Ergun's equation corresponded well on the measured one. Moreover it was ascertained that the temperature distribution measured by a shaft sonde could represent the gas velocity distribution at the shaft part of blast furnace.
2차원 모델에 의한 샤프트형 환원로에서의 입자 흐름의 해석
이영재,정석광 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.10
In this study particle flow in a shaft-typed furnace was analysed using a 2-dimensional scale mocel. The measured trajectories of burden turned out to be well matched with the calculated one. On lump-only charging, the discharging characteristics of particles at the lower part of the furnace based on the kinematic model, illustrated the "W" type which resulted from the descending speed differences between the middle and wall or center zones. On pellet-lump misting, material and particle segregations by friction always occurred, resulting in "inverted U" shaped discharging profile due to faster descending at wall.
鄭眞秀,李相皓,鄭錫光 대한금속재료학회 2001 대한금속·재료학회지 Vol.39 No.12
The burden flows by modification of rotating chute were studied using 1/16 scaled model of blast furnace. Adoption of repulsion plate on the marginal end of chute turned out to be very effective to control the falling width of ore and coke. Because falling trajectory of burden moved to central part, tilting angle of chute needed to be decreased to maintain same profile with that of conventional chute. Furthermore the mixed zone of ore to coke and piling of large particle size at the furnace center were increased, which was anticipated to show some positive effects for ensuring central gas flow.