基于线性耗散热力学的废钢熔化行为研究

Steel scrap melting behavior based on linear dissipative thermodynamics

为揭示废钢熔化过程中的传热传质机制,采用线性耗散热力学理论,研究了钢液与废钢之间的传热,碳的扩散传质以及两者之间的耦合作用关系。结合移动边界层理论模型,得到了钢液温度为1 773 K、钢液碳质量分数为1.0%、废钢半径为0.03 m、废钢的初始温度为300 K时界面处碳的质量守恒方程,即基于线性耗散热力学理论的废钢熔化模型,并通过前人的实验结果验证了模型的准确性。研究建立的基于线性耗散热力学的废钢熔化模型可以预测废钢熔化过程中界面处碳含量、碳的活度和界面温度随时间的变化规律,为实际工业生产提供理论指导。

In order to reveal the mechanism of heat and mass transfer in the melting process of steel scrap, linear dissipative thermodynamics was applied to investigate the heat transfer between liquid steel and steel scrap, and the diffusion and mass transfer of carbon and the coupling relationship between them. Combined with the moving boundary layer theory model, the mass conservation equation of carbon at the interface was obtained when the liquid steel temperature is 1 773 K, the carbon mass fraction of liquid steel is 1.0 mass%, the scrap radius is 0.03 m and the initial temperature of scrap is 300 K, that is, the scrap melting model based on the theory of linear heat dissipation mechanics. The accuracy of the model is verified by previous experimental results. The scrap melting model based on linear heat dissipation mechanics established can predict the changes of carbon content, carbon activity and interface temperature with time in the scrap melting process, and provide theoretical guidance for practical industrial production.