改善热轧降尘效率的雾化参数分析*

Analysis of atomization parameters for improving dust reduction efficiency of hot rolling

摘要:

为提高热轧工作区的雾化降尘效率，研究尘雾颗粒碰撞相关理论，以热轧产生的氧化铁皮粉尘为研究对象，建立基于雾滴粒径、雾滴速度和液体流量多个雾化参数的降尘效率计算模型；分析单一雾化参数对降尘效率的影响；通过实验，测得不同气液压力组合下的雾化参数，运用响应曲面法，分析多个雾化参数耦合对降尘效率的影响。结果表明：降尘效率随着雾滴粒径的减小、液体流量增大而提高，雾滴速度对其影响不明显；多因素耦合时，通过调节气液压力组合来控制降尘效率，结合高温环境对雾滴存活时间的影响分析，当气压0.3 MPa、液压0.5 MPa时，粒径为21～27 μm的粉尘沉降效果最佳，降尘效率达到90%以上，可有效解决热轧车间粉尘污染问题。

Abstract:

In order to improve the efficiency of atomization dust reduction in the hot rolling work area,the related theories of fog and dust particles collision were studied.Taking the iron oxide scale dust produced by hot rolling as the research object,a calculation model of dust reduction efficiency based on multiple atomization parameters of droplet size,droplet velocity and liquid flow rate was established.The influence of single atomization parameter on the dust reduction efficiency was analyzed,then the atomization parameters under different gas-liquid pressure combinations were measured through experiments,and the response surface method was used to analyze the influence of multiple atomization parameters coupling on the dust reduction efficiency.The results showed that the dust reduction efficiency increased with the decrease of droplet size and the increase of liquid flow rate,and the droplet velocity had no obvious influence on it.In case of multi-factor coupling,the dust reduction efficiency could be controlled by adjusting the gas-liquid pressure combination.Combined with the analysis on the impact of high-temperature environment on the survival time of droplets,when the gas pressure was 0.3 MPa and the liquid pressure was 0.5 MPa,the dust settling effect with the particle size of 21~27 μm was the best,and dust reduction efficiency reached more than 90%.It can effectively solve the problem of dust pollution in the hot rolling workshop.