热镀锌沉没辊系粘滞阻力及其影响因素研究

Study on Viscosity Resistance and Influence Factors of Sunken Roll System in Hot-Dip Galvanizing Unit

针对沉没辊系所受锌液粘滞阻力无法获取的问题,首先分析粘滞阻力影响机理和影响因素,根据辊及带钢的运动特性划分边界层,构建沉没辊系粘滞阻力新模型,通过改变辊插入量调控辊转动状态来反求边界层粘滞阻力,最后将该模型应用于某镀锌机组。结果表明,两种规格带钢在锌锅内各分区粘滞阻力计算误差都在15%范围内满足机组要求;在实际工况下,带钢与锌液速度差对锌液粘滞阻力影响呈现非线性递增规律,锌液粘滞阻力随带钢表面镀锌量增加而呈现非线性递减趋势但其波动幅度不同,而锌液粘滞阻力随带钢与锌液的温差递增呈现不同程度下降趋势。

To address the issue of obtaining the viscous resistance of zinc liquid in the sunken roller system,this study first analyzes the mechanism and influencing factors of viscous resistance.By dividing the boundary layer based on the motion characteristics of the roller and strip steel,a new model for viscous resistance in the sunken roller system is proposed.Adjusting the roller insertion amount to manipulate the roller rotation state,the boundary layer viscous resistance is calculated in reverse.At last the model is applied to a galvanizing unit.The results show that the calculation error of each zone viscous resistance for different specifications strip steel in the zinc pot is within 15%,which meets the requirements of the unit.Furthermore,under actual working conditions,the effect of velocity difference between strip steel and zinc liquid on the viscosity resistance of zinc liquid presents a nonlinear increasing law under the actual working conditions of strip steel.The viscosity resistance of zinc liquid presents a nonlinear decreasing trend with the increase of zinc surface,but its fluctuation amplitude is different,while the viscosity resistance of zinc liquid presents a decreasing trend with the increase of temperature difference between strip steel and zinc liquid.