铁矿石烧结过程传热传质数值模拟

摘要

Iron ore sintering is a complex process of heat and mass transfers, which contains heat transfers in/between each phase, water evaporation and condensation, coke combustion, limestone decomposition and gaseous reaction. Through researching the iron ore sintering process, a 3D-unsteady mathematical model was developed. This model was based on the porous media model and combined the portion non-equilibrium thermodynamics energy two-equation model, species transport and sintering reaction kinetic models. This model was conducted on the platform of FLUENT software, the energy two-equation model was established through the user defined scalars (UDS), and the source terms of energy equations and species transport equations are corrected through the user defined functions (UDF). The temperature of gas and solid and the distribution of major gas components can be obtained by using this model to simulate the sintering process. The simulation results and the experimental results are agreed well, which shows that the model is reliable.%铁矿石烧结是一个复杂的传热传质过程,包括各相之问的传热、水的蒸发与冷凝、碳燃烧、石灰石分解、矿石熔化与凝固以及气相反应等方面.通过对烧结过程进行研究,以多孔介质模型为基础,结合局部非热力学平衡的能量双方程模型、组分传输模型和烧结反应动力学模型,以FLUENT软件为计算平台,采用自定义标量(UDS)构建能量双方程模型,采用自定义功能(UDF)对能量方程、组分传输方程的源项进行修正和定义,建立铁矿石烧结过程传热传质的三维非稳态计算模型.利用该模型对烧结过程进行数值模拟,得到气、固温度以及主要烟气成分的分布,通过与测试值的对比来验证模型的可靠性.