薄板坯连铸连轧辊底加热炉内传热过程的数学模型

Mathematical Model of Heat Transfer in Roller-Hearth Heating Furnace for Continuous Casting and Rolling of Thin Slab

研究了包头钢铁(集团)公司薄板坯连铸连轧厂辊底加热炉内的传热过程,在辐射平衡态的条件下建立了炉内辐射与板坯、炉衬固体壁相耦合求解的炉内热过程数学模型,其中辐射传递方程的求解采用离散坐标法。采用控制体积法对数学模型进行离散,自主开发了辊底加热炉型的通用热过程模拟软件,经计算得到炉气、板坯温度沿炉长的分布,炉子出口处板坯温度与生产实测值的最大误差小于10%。该软件对理论研究和生产实践具有一定的指导意义。

The mathematical model of heat transfer in the roller hearth heating furnace for CSP in Baotou Iron and Steel Company was studied. Based on the balance of radiation heat transfer equation, the mathematical model was built by coupling with radiative heat transfer equation,which is solved by discrete ordinates method and conduction heat transfer equation of slab and furnace liner, After discretion of model using control volume method, the software for simulating the thermal process of furnace was developed. The temperature distributions, such as gas temperature and slab temperature, along the furnace length were obtained by using the software. The maximum difference between the slab temperature at furnace exit, which is obtain by the software and the measured one is less than 10%. The result obtained is very useful in the field of design and production.