Numerical investigation on melting characteristics of scrap with heat and mass transfers in molten steel  

作　　者：Cong-lin Yao Hong-chun Zhu Zhou-hua Jiang Hua-bing Li Hong-bin Lu Shu-cai Zhang Hao Feng 

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China [2]Institute for Frontier Technologies of Low-Carbon Steelmaking,Northeastern University,Shenyang 110819,Liaoning,China [3]Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking,Northeastern University,Shenyang 110819,Liaoning,China [4]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China [5]Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education),Shenyang 110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2023年第6期1090-1100,共11页

基　　金：funded by the National Key R&D Program of China(Grant No.2017YFB0304205);Fundamental Research Funds for the Central Universities(Grant No.N2225046).

摘　　要：Herein,a numerical simulation with simultaneous heat and mass transfers is carried out to investigate the scrap melting characteristics in molten steel after model verification by published experimental data.The numerical results show that the scrap melting stages consist of the frozen shell formation stage,the frozen shell remelting stage and the parent scrap melting stage.The heat transfer coefficient and the carbon mass transfer coefficient between the scrap and the molten steel are,respectively,in the range of 4209-6249 W m^(-2) K^(-1) and 6.4×10^(-5) m s^(-1).Meanwhile,the effects of process parameters on scrap melting time were studied.An increase in the scrap preheating temperature(T_(scrap)),the molten steel temperature(T_(steel))and the carbon content of molten steel(C_(steel)),and a decrease in the scrap thickness dscrap,can reduce the frozen shell existence time,as well as the scrap melting time.On this basis,a quantitative relationship between the aforementioned process parameters and the scrap melting time is obtained to predict the formation of frozen shell(W),which provides process guidance for shortening the scrap melting time.The quantitative relationship is expressed as:lnΨ=311.32-2.34ln(T_(scrap))-39.99ln(T_(steel))-0.08ln(d_(scrap))-0.57ln(C_(steel)).

关 键 词：Frozen shell Scrap melting Heat transfer Mass transfer Numerical simulation Electric arc furnace 

分 类 号：TG142[一般工业技术—材料科学与工程]