Title

鐵水流動中爐蕊飄浮高度影響高爐爐床底部侵蝕之數值模擬

Translated Titles

Numerical Simulation on the Influence of Floating Height for Deadman upon Erosion at Hearth Bottom in Blast Furnace during Tapping Process

Authors

葉晉佑

Key Words

高爐 ; 爐床侵蝕 ; 爐蕊 ; 數值模擬 ; furnace ; hearth erosion ; deadman ; numerical simulation

PublicationName

中興大學化學工程學系所學位論文

Volume or Term/Year and Month of Publication

2009年

Academic Degree Category

碩士

Advisor

鄭文桐

Content Language

繁體中文

Chinese Abstract

延長高爐(blast furnace)的爐代壽命為現今各國鋼鐵廠所致力的目標,其中爐床(hearth)的耐火材因為長時間受到鐵水的沖刷和侵蝕,導致爐床的耗損情況往往決定了高爐的壽命,為了降低護爐成本以提高鋼鐵廠的競爭力,必須瞭解鐵水流動與爐床侵蝕的關係,而鐵水流場又受爐蕊的飄浮高度影響。故本研究以數值模擬方式,解析高爐出鐵時,爐蕊飄浮高度與爐床底部侵蝕的關係。 研究以中鋼二號高爐爐床為計算架構,範圍包含爐磚、鐵水與多孔質的爐蕊區(deadman),利用計算流體力學軟體求解三維層流的動量方程式、熱傳方程式與質傳方程式。爐蕊區的部分,則分別導入Ergun方程式與質傳源項,來描述爐蕊對鐵水造成的動量損耗以及碳質傳現象。分析爐床內鐵水的流場、溫度場與濃度場結果,並改變爐蕊飄浮高度與高爐的操作條件。由結果顯示,可獲得以下重要結論: (1) 爐蕊漂浮高度較高時,底部鐵水流速變慢,爐底的剪切應力與溶碳質通量降低,1150˚C等溫線往內移。但當爐蕊漂浮高度高於某個高度時,剪切應力持續變小,溶碳質通量因濃度差過大而增加,並將此時的飄浮高度稱為極值高度。 (2) 進料量增加時,鐵水流速變快,爐底的剪切應力與溶碳質通量上升,1150˚C等溫線往外移,極值高度變低。 (3) 增加進料濃度有利於減少爐底的溶碳質通量,極值高度上升。 (4) 進料溫度增加,爐底的剪切應力變小,溶碳質通量增加,1150˚C等溫線往外移,極值高度影響不大。

English Abstract

Making the campaigns of blast furnaces grow longer is the final targets for all steel companies in the world. Owing to scour and erosion from hot metal, the campaigns life of blast furnace is decided by the erosive situations in the hearth. In order to reduce protective cost and promote the competitive ability, we must understand the relationship between hot metal and hearth erosion. And the floating height for deadman affects the hearth erosion. Thus, this research is an analysis of relationship between the floating height for deadman and erosion at hearth bottom by numerical simulation during tapping process. Based on BF2 of Chinese Steel Co., the three dimensional laminar equation for momentum, transfer equations for energy and mass were solved by computational fluid dynamics. The computational domain included the refractories, deadman and hot metal. The Ergun equation and source of mass were applied to estimate momentum loss and carbon dissolution from deadman respectively. In addition, changing the floating height for deadman and operating conditions were the way to analyze the velocity, temperature and concentration in the hearth. According to the results, the conclusions are listed in the followings: (1) When the floating height for deadman is higher, the velocity, shear stress and carbon dissolution flux is slower at hearth bottom. The isotherm of 1150˚C is inner. The shear stress still decreases, but the carbon dissolution flux rises because of more concentration difference when the floating height is higher than a level. This level is named extreme-floating-height. (2) An increase in production rate produces increases in velocity, shear stress and carbon dissolution flux at hearth bottom. The isotherm of 1150˚C is more outer. The extreme-floating-height becomes lower. (3) Increasing the inlet-concentration is useful to diminish the carbon dissolution flux at hearth bottom and the extreme-floating-height becomes higher. (4) An increase in inlet-temperature provokes a decrease in shear stress and an increase in carbon dissolution flux at hearth bottom. The isotherm of 1150˚C is outer. The extreme-floating-height is the same.

Topic Category 工學院 > 化學工程學系所
工程學 > 化學工業
Reference
  1. [5] F. Yoshikawa, Mathematical Modeling of Fluid Flow and Heat Transfer in Blast Furnace Hearth: Massachusetts Institute of Technology, 1980.
    連結:
  2. [6] F. Yoshikawa and J. Szekely, "Mechanism of Blast Furnace Hearth Erosion," Ironmaking and Steelmaking, vol. 8, pp. 159-168, 1981.
    連結:
  3. [14] S. T. Cham, R. Sakurovs, H. Sun, and V. Sahajwalla, "Influence of Temperature on Carbon Dissolution of Cokes in Molten Iron," ISIJ International, vol. 46, pp. 652-659, 2006.
    連結:
  4. [16] A. Preuer, J. Winter, and H. Hiebler, "Computation of the Erosion in the Hearth of a Blast Furnace," Steel Research, vol. 63, pp. 147-151, 1992.
    連結:
  5. [17] A. Preuer, J. Winter, and H. Hiebler, "Computation of the Iron Flow in the Hearth of a Blast Furnace," Steel Research, vol. 63, pp. 139-146, 1992.
    連結:
  6. [21] C. Q. Zhou, F. Yan, K. A. Patnala, and D. Roldan, "Numerical Investigation of Parametric Effects on a Blast Furnace Hearth," presented at AISTech 2004 Proceedings, 2004.
    連結:
  7. [23] K. Takatani, T. Inada, and K. Takata, "Mathematical Model for Transient Erosion Process of Blast Furnace Hearth," ISIJ International, vol. 41, pp. 1139-1145, 2001.
    連結:
  8. [25] K. H. Peters, H. W. Gudenau, and G. Still, "Hot Metal Flow in a Blast Furnace Hearth - Model Tests," Steel Research, vol. 56, pp. 547-552, 1985.
    連結:
  9. [26] K. Shibata, Y. Kimura, M. Shimizu, and S.-i. Inaba, "Dynamics of Dead-man Coke and Hot Metal Flow in a Blast Furnace Hearth," ISIJ International, vol. 30, pp. 208-215, 1990.
    連結:
  10. [27] T. Nouchi, A. B. Yu, and K. Takeda, "A Numerical Investigation of the Coke Movement in Blast Furnace Hearth," presented at Proc. 9th Apcche (joint with Chemeca), Auckland,New Zealand, 2002.
    連結:
  11. [28] 黃啟恩, 高爐爐下部流力與熱流數值模擬. 博士論文: 國立中興大學, 2008.
    連結:
  12. [29] C. E. Hung, S. W. Du, and W. T. Cheng, "Numerical Investigation on Hot Metal Flow in Blast Furnace Hearth through CFD," ISIJ Internaional, vol. 48, pp. 1182-1187, 2008.
    連結:
  13. [30] W. Kowalski, "State of the Art for Prolonging Blast Furnace Campaigns," Revue De Metallurgie - Cahiers D'lnformations Techniques, vol. 97, pp. 493-505, 2000.
    連結:
  14. [33] A. Shinotake, H. Nakamura, N. Yadoumaru, Y. Morizane, and M. Meguro, "Investigation of Blast-furnace Hearth Sidewall Erosion by Core Sample Analysis and Consideration of Campaign Operation," ISIJ Internaional, vol. 43, pp. 321-330, 2003.
    連結:
  15. [34] J. H. Lee and J. K. Chung, "Effect of Packed Bed State on the Liquid Flow in Blast Furnace Hearth," presented at 2nd International Conference on Process Development in Iron and Steelmaking, 2004.
    連結:
  16. [35] S. Ergun, "Fluid Flow Through Packed Columns," Chemical Engineering Progress, vol. 48, pp. 89-94, 1952.
    連結:
  17. [36] V. Panjkovic, J. S. Truelove, and P. Zulli, "Numerical Modelling of Iron Flow and Heat Transfer in Blast Furnace Hearth," Ironmaking and Steelmaking, vol. 29, pp. 390-400, 2002.
    連結:
  18. [37] V. Panjkovic and J. S. Truelove, "Computational Fluid Dynamics Modelling of Iron Flow and Heat Transfer in the Iron Blast Furnace Hearth," presented at Second International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, Australia, 1999.
    連結:
  19. [39] A. Kasai, T. Murayama, and Y. Ono, "Measurement of Effective Thermal Conductivity of Coke," ISIJ International, vol. 33, pp. 697-702, 1993.
    連結:
  20. [42] S. V. Patanker and D. B. Spalding, "A Calculation Procedure for Heat, Mass and Momentum Transfer in Three-Dimensional Parabolic Flows," International Journal of Heat and Mass Transfer, vol. 15, pp. 1787-1806, 1972.
    連結:
  21. [43] H. W. Gudenau, J. P. Mulanza, and D. G. R. Sharma, "Carburization of Hot Metal by Industrial and Special Cokes," Steel Research, vol. 61, pp. 97-104, 1990.
    連結:
  22. [1] http://en.wikipedia.org/wiki/Iron, "Iron."
  23. [2] http://www.thepotteries.org/shelton/blast_furnace.htm, "The Blast Furnace."
  24. [3] http://museum.csc.com.tw/, "鋼鐵數位博物館."
  25. [4] http://www.csc.com.tw/csc/pd/prs03.htm, "高爐生產流程."
  26. [7] 張皖菊, 張影, 和 杜剛, "高爐爐缸爐底侵蝕機理研究進展," 鋼鐵研究, vol. 6, pp. 10-14, 2001.
  27. [8] 黃曉煜 和 薛向欣, "我國高爐爐缸破損情況初步調查," 鋼鐵, vol. 33, pp. 1-8, 1998.
  28. [9] 程坤明, "影響高爐爐底爐缸碳磚使用壽命的因素," 煉鐵, vol. 25, pp. 11-15, 2006.
  29. [10] S. Fujihara, S. Tamura, M. Ikeda, and M. Nakai, "High-duty Carbon Blocks," Nippon Steel Technical Report, pp. 1-6, 1989.
  30. [11] S. N. Silva, F. Vernilli, S. M. Justus, O. R. Marques, A. Mazine, J. B. Baldo, E. Longo, and J. A. Varela, "Wear Mechanism for Blast Furnace Hearth Refractory Lining," Ironmaking and Steelmaking, vol. 32, pp. 459-467, 2005.
  31. [12] R. McNally, F. Roulet, D. Kuster, J.Schoennahl, and D. Lucke, "Advances & Advantages with Ceramic Cup Technology," presented at Alafar, Mexico, 2000.
  32. [13] R. G. Olsson, V. Koump, and T. F. Perzak, "Rate of Dissolution of Carbon in Molten Fe-C alloys," Transactions of the Metallurgical Society of Aime, vol. 236, pp. 426-429, 1966.
  33. [15] 鄒明金 和 宋木森, "高爐碳磚抗鐵水溶蝕性能的研究," 鋼鐵, vol. 31, pp. 70-74, 1996.
  34. [18] J. R. Post, T. Peeters, Y. Yang, and M. A. Reuter, "Hot Metal Flow in the Blast Furnace Hearth : Thermal and Carbon Dissolution Effects on Buoyancy Flow and Refractory Wear," presented at Third International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, Australia, 2003.
  35. [19] 郁龍貴, "關於"鐵碳合金相圖"教學方法的探討," 上海第二工業大學學報, vol. 23, pp. 133-135, 2006.
  36. [20] F. Yan and C. Q. Zhou, "3-D Computational Modeling of a Blast Furnace Hearth," presented at AISTech 2004 Proceedings, 2004.
  37. [22] 楊志榮, 程樹森, 趙宏博, 和 何小平, "太剛高爐爐底爐缸長壽探討," 煉鐵, vol. 24, pp. 16-21, 2005.
  38. [24] 周國凡, "高爐爐缸鐵水流速度影響因素的水模試驗," 武漢科技大學學報, vol. 28, pp. 330-332, 2005.
  39. [31] P. K. Iwamasa, G. A. Caffery, W. D. Warnica, and S. R. Alias, "Modeling of Iron Flow, Heat Transfer, and Refractory Wear in the Hearth of an Iron Blast Furnace," presented at Inter Conf on CFD in Metal Processing and Power Generation, 1997.
  40. [32] G. A. Kudinov, V. A. Krishtal, and E. E. Lysenko, "Computer Diagnosis of Erosion of the Refractory Brickwork of the Hearth and Bottom," Steel in Translation, vol. 27, pp. 11-14, 1997.
  41. [38] E. A. Brandes and G. B. Brook, Smithells Metals Reference Book, 7th ed. United Kingdom: Oxford,ButterWorth-Heinemann, 1998.
  42. [40] M. Kosaka and S. Minowa, "On the Rate of Dissolution of Carbon into Molten Fe-C Alloy," Transactions ISIJ, vol. 8, pp. 392-400, 1968.
  43. [41] J. Chipman, R. M. Alfred, L. W. Gott, R. B. Small, C. N. Thomson, D. L. Guernsey, and J. C. Fulton, "The Solubility of Carbon in Molten Iron and in Iron-Silicon and Iron-Manganese alloys," Transactions of the American Society for Metals, vol. 44, pp. 1215-1232, 1952.
Times Cited
  1. 張家銘(2010)。利用CFD技術預測高爐爐床與高爐流道侵蝕狀況。中興大學化學工程學系所學位論文。2010。1-114。