合金化过程中抑制烟囱效应的数值模拟研究

Numerical Simulation of Restraining Stack Effect in Alloying Process

以热镀锌机组合金化炉为研究对象,建立合金化炉内空气流动与热交换的物理模型和数学模型,对炉体侧封不同高度以及增设阻流板前后情况进行对比,研究阻流板对带钢表面温度的影响。利用CFD软件,采用标准k-ε湍流模型,对合金化炉内流场和温度场的分布进行数值模拟研究,得到炉内流场和温度场分布特征。结果表明:在相同的加热功率条件下,炉体无侧封高度,增设阻流板将有助于提高炉内气流温度;然而,在炉体侧封高度分别为0.09、1.29 m的情况下,阻流板抑制炉内热气流的烟囱效应,阻碍热气流对带钢的加热作用,导致带钢表面温度降低。

Taking the galvannealing furnace as research object, the physical and mathematical models for the flow and heat transfer of the galvannealing furnace were established, and through comparison of the situations under different height＇s sealing furnace and before and after adding spoilers, the effect of the spoilers on the temperature on steel sheets was studied. The flow field and temperature field in galvannealing furnace was simulated by standard k-8 turbulence model in CFD software, and the temperature and velocity distribution in the furnace was obtained. The results show, in equal heating power condition, in the furnace without lateral sealing height, adding spoilers can increase the temperature on the steel plate. Whereas, under the sealing furnace with the height of 0.09 m or 1.29 m, respectively, adding spoilers can restrain stack effect of heating airflow and obstruct heating effect of galvanized steel sheets in the furnace, so as to lead to temperature reduction in the surface of the steel sheet.