材料期刊网

基于对加热炉内钢坯氧化烧损机理的研究，根据CSP均热工艺特点，以实验均热炉为研究对象，采用k-ε湍流模型、DO辐射模型、EDM燃烧模型，建立了辊底式均热炉内流动、燃烧、传热数学模型。利用工程流体力学软件Fluent 6.2，研究了空气消耗系数对CSP均热过程中氧化烧损的影响。通过分析数值计算结果，得到一下结论：在保证燃烧完全的条件下尽量降低空气过量系数，有利于提高钢坯的温度，可减少加热时间，降低钢坯氧化烧损量；增大空气消耗系数将使得钢坯温度均匀性恶化，但空气消耗系数增大到一定程度时，钢坯温度均匀性则变化不大；氧气对钢坯的氧化性大于二氧化碳和水蒸气，应当严格控制炉内氧气的残留量，以减小氧化烧损量。

Based on the study iron scale mechanism in reheating furnace, the mathematical model of flow, combustion and heat transfer in roller reheating furnace was established with the experimental reheating furnace as instance, according to the technological characteristics in soaking process of Compact Strip Production (CSP) line. Some valid simplifications were employed in the mathematical model, such as, k-ε turbulent model, DO (Discrete Ordinates) radiation model, EDM (Eddy Dissipation Model ) combustion model, etc. The effect of air consumption ratio on loss of iron scale in the soaking process was studied by utilizing the CFD (Computational Fluid Dynamic) software FLUENT 6.2.The results show that, the mean temperature of slab in the soaking process is higher under the condition of low enough consumption air with fuel being combusted fully. The thermal condition of reheating furnace makes soaking time less to deduce the capacity loss of iron scale. The temperature uniformity of slab becomes bad with air consumption ratio increasing, but when air consumption ratio increases in the certain range, it becomes steady. The oxidizability of oxygen to steel slab is stronger than that of both carbon dioxide and water vapor. so the residual capacity of oxygen should be controlled to ensure the loss of iron scale is in the acceptable range.