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由于外部气体渗入炉内易造成钢卷被氧化,为了寻求避免钢卷退火时发生表面氧化的方法,采用流体分析软件FLUENT对罩式退火炉炉内的流场进行分析,结果表明:分流板对气体的扰动作用是造成气体涡流场的直接原因;当钢卷外径过小时,分流板对气体的扰动作用较强,易于造成外部气体渗入;当钢卷外径大于分流板外径时,分流板对气体的扰动作用减弱;当钢卷外径大于2300mm时,钢卷周围不再出现涡流场;钢卷外径控制在2400±100mm范围内为最佳。
Due to the infiltration of external gas into the furnace, the coil could be oxidized. In order to find a way to avoid the surface oxidation during annealing, the fluid analysis software FLUENT was used to analyze the flow field in the bell annealer. The results showed that: The disturbing effect of gas is the direct cause of gas vortex field. When the coil diameter is too small, the diverter plate has strong disturbance to the gas and is easy to cause the infiltration of outside air. When the outside diameter of the coil is larger than the outside diameter of the manifold, The effect of plate disturbance on the gas is weakened. When the outer diameter of the coil is more than 2300mm, the eddy current field no longer appears around the coil; the outer diameter of the coil is controlled within the range of 2400 ± 100mm.