Penetration Effect of Injected Gas at Shaft Gas Injection in Blast Furnace Analyzed by Hybrid Model of DEM-CFD

• Natsui Shungo

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Ueda Shigeru

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Nogami Hiroshi

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Kano Junya

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Inoue Ryo

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Ariyama Tatsuro

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

抄録

Shaft gas injection of reducing gas in the blast furnace is one of favorable ways to greatly decrease CO₂ emissions from steel works, and this approach is used for the top gas recycling and oxygen blast furnace processes. In these processes, the penetration effect of the gas injected from the auxiliary tuyeres is important for attaining effective gas reduction or making up the heat balance in the upper part, and so it is useful to analyze the dynamic behavior of the gas injected into the shaft. <br>In the present study, the penetration effect of injected gas was three-dimensionally simulated by a hybrid model of the discrete element method (DEM) and continuum model (CFD). In particular, the CFD model was used to quantitatively analyze the dynamic gas flow and the pressure distribution in the burden layers calculated by DEM. Although the area influenced by the injected gas from the auxiliary tuyeres was restricted to a specific area due to insufficient horizontal inertial force of the gas, the penetration area gradually enlarged as the gas velocity from the auxiliary tuyeres increased. In a small blast furnace, the injected gas can easily reach the center with the higher gas velocity, and it was shown that the relative penetration depth of the injected gas depends on the inner volume of the blast furnace. However, the overall behavior of the injected gas did not show any remarkable change. In conclusion, the penetration area of shaft gas was almost proportional to the ratio of shaft gas and the upward gas from the conventional tuyeres.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 51 (9), 1410-1417, 2011

  一般社団法人 日本鉄鋼協会

キーワード

• ironmaking
• blast furnace
• shaft gas injection
• low reducing agent operation
• discrete element method
• computational fluid dynamics

詳細情報

• CRID: 1390001206487626240
• NII論文ID: 10030382634
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.51.1410
• COI: 1:CAS:528:DC%2BC3MXht1Cisr7F
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational/51/9/51_9_1410/_pdf
• 本文言語コード: en
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