Abstract: In order to stably improve the efficiency of atomization and dust removal in high temperature environment, the droplet evaporation factor with evaporation rate structure was introduced. The atomization processes in high temperature environment were simulated by numerical simulation, and the interactions of nozzle structure, atomization performance and high temperature dust removal efficiency were explored. The L25 Taguchi method was used to design the test, and the outlet diameter, inlet pressure and axial distance of the X swirl pressure nozzle were selected as key parameters, and the influences of each parameter on atomization performance were explored to obtain the optimal parameter combination. Results show that the atomization zone is affected by temperature, and the mass concentration of droplets is a key indicator to improve the efficiency of high temperature atomization and dust removal. The importance of the three key parameters from high to low is as follows:axial distance, inlet pressure and outlet diameter. In the hot rolling processes of HIB steel, the optimal working parameters of the nozzle are as 2 mm nozzle outlet diameter, 8 MPa inlet pressure and 90 cm axial distance. The dust removal efficiency at high temperature is increased to more than 80%.

Key words: high temperature atomization, dust removal efficiency, evaporation factor, nozzle caliber, Taguchi test

摘要： 为稳定提高高温环境中的雾化降尘效率，引入蒸发率构造的液滴蒸发因子，利用数值仿真模拟高温环境下的雾化过程，探索喷嘴结构、雾化性能和高温降尘效率之间的交互影响规律；采用L25田口方法设计试验，选取X旋流压力喷嘴的出口直径、进口压力、轴向距离作为关键参数，探究各参数对雾化性能的影响，获得最优参数组合。研究结果表明：雾化区受温度的影响，液滴质量浓度是提高高温雾化降尘效率的关键指标；3个关键参数的重要性由高到低依次为轴向距离、进口压力、出口直径；在HIB钢热轧工艺中，最优关键参数组合为喷嘴出口直径2 mm、进口压力8 MPa、轴向距离90 cm。高温降尘效率提高到80%以上。

关键词: 高温雾化, 降尘效率, 蒸发因子, 喷嘴口径, 田口试验