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以能量平衡为基础,采用三维段法数学模型建立了炉气段、炉围段、钢坯表面段的能量平衡方程组。在典型工况时,以钢坯表面热流为耦合条件,采用主变量修正法求解了加热炉内炉气及炉围温度场,采用有限差分法求解了钢坯温度场。分析了钢坯表面黑度变化及炉气吸收系数变化对钢坯升温过程及排烟温度的影响规律。
Based on the energy balance, the energy equilibrium equations of the furnace gas section, the furnace section and the billet surface section are established by the mathematical model of three-dimensional section method. In the typical working condition, the heat flux of the billet was used as the coupling condition, and the temperature field of the furnace gas and the furnace surrounding area was solved by the principal variable correction method. The temperature field of the billet was solved by the finite difference method. The influence of the variation of the surface blackness and the change of the gas absorption coefficient on the billet temperature rise and the flue gas temperature was analyzed.