轧钢加热炉富氧燃烧过程的数值研究

借助数值模拟方法研究了不同气氛、氧浓度以及燃料热值对加热炉燃烧特性以及Nq排放的影响规律。结果表明：富氧燃烧能提高炉膛燃烧温度，使炉壁辐射换热量NJJtt约5．2％，排烟热损失减小约21．7％。相同富氧浓度条件下，空气气氛下炉膛燃烧温度更高，炉壁辐射换热量增加约5％，排烟损失减少24％以上；但OjCOz气氛下钢坯表面传热特性改善，断面温度分布更加均匀，Nq排放量降低为空气气氛的1／10以下。

Numerical Study of Oxygen-enriched Combustion Process for Reheating Furnace

The impacts of varies atmosphere, oxygen concentration as well as fuel calorific value to temperature distribution, steel reheating quality and NOx emission were numerically studied. The result shows that oxygen-enriched combustion can enhance the reheating temp- erature, and the radiation heat flux increases by about 5.2%, and the emission heat loss decreases by about 21.7%. Compared with OJCO2 of the same oxygen concentration, the furnace temperature gets higher for air atmosphere, and the radiation heat flux increases by about 5%, and the emission heat loss decreases by more than 24%. While for OJCQ atmosphere, the steel reheating quality is improved, the cross temperature distribution is more homogenous, and the NOx emission decreases to 1/10 compared to air condition.