煉鋼鋼液溫降成因分析與溫度預測之研究

Analysis of Molten Steel Temperature Dropping and Temperature Prediction for Steelmaking

林常盛(C.S. Lin) ； 陳正信(J.H. Chen) ； 鄒穎(Y. Tsou)

《鑛冶：中國鑛冶工程學會會刊》 67卷3期 (2023/09) Pp. 36-41

https://doi.org/10.30069/MM.202309_67(3).03

摘要

本研究利用熱傳理論配合實際盛鋼桶構成與特性、鋼液與渣面實測溫度，對盛鋼桶散熱機構作探討，釐清溫降原因與程度。分析發現：1.盛鋼桶本體吸收鋼液熱量較多，故良好的盛鋼桶預熱與保溫，能省下大量鋼液溫度補償的成本。2.由頂部渣面輻射和對流散失的熱能視渣面溫度而定，渣面溫度較高，熱能散失大，顯示盛鋼桶加蓋保溫措施的重要性。3.盛鋼桶隨使用次數增加，耐材厚度會逐漸減少，保溫效果變差，外壁溫度上升，外壁散失熱量也逐漸增加，甚至超過渣面散熱。若進一步加上時間因子，將可以估算鋼液溫度的下降程度，有助於更準確的控制煉鋼製程的參數調整。

關鍵字

盛鋼桶 ； 鋼液溫度 ； 溫降速率

並列摘要

By analyzing the cause of the temperature drop of the molten steel during the steelmaking process, it is known that the heat loss of the molten steel is mainly due to the heat absorption of the ladle body, and the heat convection and radiation from the outer ladle shell and slag. The ladle body absorbs lot of heat from the molten steel; therefore, good ladle preheating and heat preservation can reduce costs for reheating. The heat dissipated from the top slag depends on the temperature of the slag surface, which shows the importance of the insulation cover of the ladle top. As the using times of a ladle increasing, the thickness of the refractory will gradually decrease, and the thermal insulation effect will become weak. The temperature of the outer wall rises, and the heat loss from the outer wall increases. The temperature drop rate of molten steel can be estimated by combining the degree of influence of these known ways and change the holding time. This is helpful for more accurately adjusting the parameters of the steelmaking process.

並列關鍵字

Ladle ； Molten steel temperature ； Temperature drop rate

參考文獻

N. Tomochika, Takehiro Nakaoka, T. Tsukuda, Y. Nagase, H. Katsura, K. Sumida, Development of Prediction Technique for Temperature Distribution of Molten Steel in Steelmaking, Kobelco Technology Review 37(2019), p.57-62.

N. Gupta, S. Chandra, Temperature prediction model for controlling casting superheat temperature, ISIJ International 44 (2004) p.1517-1526.

P.R. Austin, J.M. Camplin, J. Herbertson, I.J. Taggart, Mathematical modeling of thermal stratification and drainage of steel ladles, ISIJ International 32 (2) (1992) 196-202.

A.G. Belkovskii, Y.L. Kats, Mathematical model of the cooling of steel in a small ladle, Metallurgist 53 (2009) 261-273.