自吸式文丘里洗涤器雾化液滴尺寸影响因素的实验研究

Experimental Study on Influence Factors of Droplet Size in Self-Priming Venturi Scrubber

为研究雾化液滴尺寸对自吸式文丘里洗涤效率的影响,从喉部气速、液面高度差以及文丘里扩散段结构等方面,研究了自吸式文丘里洗涤器雾化液滴平均直径(D 32)的变化规律,并与Boll模型对D 32的预测值进行了对比。研究表明,随着喉部气速的增加,D 32的实验值和预测值均呈逐渐减小的趋势,且预测值略小于实验值。另外,液面高度差的增加会导致D 32的减小,当气相速度增大时,D 32加速减小。研究发现,当喉部气速大于54.6 m/s时,A 1挡板对液相流体具有更好的雾化效果,当喉部气速小于54.6 m/s时,在环形挡板内径为46~54 mm之间存在一个最佳内径,使得雾化液滴平均直径最小,文丘里洗涤器达到最佳雾化效果。

Venturi scrubber is an important device for environmental protection dust removal and toxic gas decontamination.The average diameter of atomized droplets is one of the important factors affecting the washing efficiency of self-priming Venturi.The variation of average droplet diameter(D32)of self-priming Venturi scrubber was studied from the aspects of throat gas velocity,height difference of liquid level and structure of Venturi diffusion section.The experimental value was compared with the predicted value of D32 by Boll model.The results showed that the experimental and predicted values of D32 decreased with the increase of throat gas velocity and the predicted value was slightly less than the experimental value.In addition,the increase of liquid level difference leaded to the decrease of D32 and the D32 decreased rapidly when the gas velocity increased.Finally,it was found that A1 baffle had better atomization effect on liquid phase fluid when the throat gas velocity was greater than 54.6 m/s,but when the throat gas velocity was less than 54.6 m/s,there was an optimal inner diameter between 46 mm and 54 mm in the annular baffle,which minimized the average diameter of atomized droplets,and Venturi scrubber achieved the best atomization effect.