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

• Natsui Shungo

  Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

• Ohno Ko-ichiro

  Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

• Sukenaga Sohei

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Kikuchi Tatsuya

  Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

• Suzuki Ryosuke O.

  Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

抄録

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.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 58 (2), 282-291, 2018

  一般社団法人 日本鉄鋼協会

キーワード

• ironmaking blast furnace
• coke bed
• trickle flow
• molten slag
• static holdup
• DEM-SPH
• basicity

詳細情報

• CRID: 1390001206488253696
• NII論文ID: 130006362650
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.isijint-2017-496
• ISSN: 13475460
• ISSN: 09151559
• HANDLE: 2115/76153
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/58/2/58_ISIJINT-2017-496/_pdf
• 本文言語コード: en
• データソース種別:
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• 抄録ライセンスフラグ: 使用不可