鋼液連續鑄造固化程序之研究

Computer Simulation of the Solidification of Liquid Metal in the Continuous Bloom Casting Process

張永輝(Yeong-Huei Chung) ； 陳延平(Yan-Ping Chen) ； 尤明隆(Min-Lon Yu) ； 林冠儒(Quan-Ju Lin)

《鑛冶：中國鑛冶工程學會會刊》 35卷3期 (1991/09) Pp. 30-39

https://doi.org/10.30069/MM.199109_35(3).0003

摘要

利用一個二維熱傳固化模式，配合大鋼胚連鑄機的噴水冷却操作條件，建立一套大鋼胚連續鑄造的模擬計算程式，以預測大鋼胚溫度分佈變化情形及凝固殼成長速率。固／液相熱傳方程式及相線移動方程式是利用IAD差分式求得數值解，鋼液／鋼胚的物化性常數皆以溫度函數表示之。有效噴水冷却熱傳係數以區域平均的觀點，表示為噴水熱傳係數及輻射熱傳係數的組合，對應噴水區内噴水密度的變化而做系統性的調節，利用紅外線測溫儀測量大鋼胚表面溫度的變化，並與計算值比較以確認模式的準確性。而模式的參數靈敏度測試，如改變澆鑄速度或噴水密度，亦可得到合理的溫度分佈及凝殼成長等製程變量。

並列摘要

This study presents the mathemtical analysis and computer simulaton results of heat transfer during solidification in continuous bloom casting process. Through this work, the temperature distribution of bloom and growth rate of solidified shell are deduced. The IAD finite difference method is used to solve the two-dimensional heat transfer equation with moving boundary. All the thermophysical properties are expressed as the function of temperature. Heat transfer coefficient is expressed as a combination of a convective term and a radiative term. The convective term is usually expressed as a function of the cooling water density in the spray cooling region. The calculated surface temperatures of blooms are compared with t he experimental data measured by two-color pyrometer and they are in good agreement with each other. Simulation results of the temperature profile, the thickness of the solid shell and the effects of the operating conditions, for example, the casting speed and the cooling water density, on the performance of the casting process are presented.