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Detailed Modeling of Melt Dripping in Coke Bed by DEM – SPH

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Title: Detailed Modeling of Melt Dripping in Coke Bed by DEM – SPH
Authors: Natsui, Shungo Browse this author →KAKEN DB
Ohno, Ko-ichiro Browse this author
Sukenaga, Sohei Browse this author
Kikuchi, Tatsuya Browse this author →KAKEN DB
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Keywords: ironmaking blast furnace
coke bed
trickle flow
molten slag
static holdup
Issue Date: 15-Feb-2018
Publisher: 日本鉄鋼協会
Journal Title: ISIJ International
Volume: 58
Issue: 2
Start Page: 282
End Page: 291
Publisher DOI: 10.2355/isijinternational.ISIJINT-2017-496
Abstract: A high-resolution numerical model was performed for a detailed understanding of packed-bed structures constructed by actual scale cokes, and the molten slag (SiO2–CaO–Al2O3) trickle flow characteristics in the lower part of an actual blast furnace. Smoothed particle hydrodynamics (SPH) simulations can track the motion of liquids containing dispersed droplets, and the discrete element method (DEM) with a multisphere approach makes possible to simulate non-spherical solid-particle motion. We carried out high-resolution large-scale trickle flow simulations using more than 10 million particles, carried out case studies of statistical processing, and evaluated the effects of physical properties varied by the composition or temperature of slag samples. We clarified that there is a limitation to predict the holdup accurately based on the capillary number, which is a widely used approach. We analyzed the influence of melt viscosity on trickle flow, and clarified that an increase in viscosity increases holdup because limiting the effective flow path and suppressing the dispersion of the droplets promoted the enlargement of each stagnant droplet. This detailed direct dynamic model could explain the mechanism underlying different holdup tendencies in conventional research.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 夏井 俊悟

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