旋流烧嘴及混装条件下步进式加热炉模拟研究

Simulation study of a walking-beam reheating furnace with swirl burners and mixed loading slabs

加热炉能耗约占热轧工序的75%,金属损失达到全工序的50%,具有很大的研究潜力。目前针对加热炉钢坯混装以及烧嘴旋流的复杂情况研究相对较少,难以精确反映加热炉内钢坯加热过程。基于计算流体力学方法建立了加热炉燃烧场与钢坯耦合传热的数学模型,研究钢坯长度方向温度分布及在旋流烧嘴及混装条件下的长钢坯在加热炉内的加热情况。结果表明,模拟值与实际值温差小于10 K。钢坯出炉时上表面和下表面最大温差分别为23和22 K,上下表面最大温差为8 K,能够满足钢坯长度方向温差小于30 K的生产需要。旋流效果在被烧嘴通道一定程度上被削弱。火焰根部温度较低易造成钢坯端头低温。

The energy consumption of reheating furnace approximately accounts for 75%of the hot rolling process,and the metal loss can reach 50%of the whole process,which have great research potential.At present,there are relatively few studies on the complex situation of mixed loading slabs and swirl burners in reheating furnace which are difficult to accurately reflect the heating process of slabs in reheating furnace.Based on the computational fluid dynamics method,a mathematical model of coupled heat transfer between the combustion field and the slabs in the reheating furnace was established.The temperature distribution in the length direction of slabs and the heating situation of long slabs in the reheating furnace under the condition of swirl burners and mixed loading slabs were studied.The results indicate that the temperature difference between the simulation and the industrial results is less than 10K.The maximum temperature differences of the top surface and the bottom surface of the slab at discharge are 23K and 22K,respectively.The maximum temperature difference between the top and bottom surfaces is 8K,which can meet the production needs of a temperature difference of less than 30K in the length direction of the slab.The vortex effect is weakened by burner channel to a certain extent.The low temperature at the root of flames is easy to cause the low temperature at the slab head and tail.