MODELING OF A DUSTED GAS FLOW CLEANING PROCESS USING A KINEMATIC MODEL OF THE INTERACTION OF DISPERSED PARTICLES WITH DROPLETS IN A WET SCRUBBER

I. Volchyn, V. Raschepkin
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Abstract

A mathematical model is proposed for the scavenging process of the dispersed particles by droplets in a wet scrubber under excess spray density in Venturi tube within kinematic approach of the interaction of particles in countercurrent gas-dispersed flows, which refines the existing engineering model, taking into account the spatial size variation of the droplets, due to their coagulation with wet slurry droplets and uncaptured particles entering a wet scrubber from the Venturi tube. The results of calculations with the adopted mathematical model showed that in case of possibility to organize the spraying of a gas flow in a scrubber with 300–500 micron droplets aerosol at a specific spray density of about 1 liter/m3, a 1–2 meters wide layer of droplets ensures effective absorption of both uncaptured PM2.5 solid particles, and the slurry droplets from the Venturi tube. The ejection of the slurry droplets into a wet scrubber from the Venturi tube, and the associated increase in the size of the scrubber droplets due to coagulation with slurry droplets, does not noticeably affect the efficiency of the dusted gas stream cleaning. An adopted mathematical model was applied to calculate the capture of particles by droplets in cylindrical and conical scrubbers. Due to the increase in a residence time of the droplets upon increased velocity of the countercurrent gas flow, the efficiency of gas cleaning from dispersed particles in a conical scrubber appears to be higher than in a cylindrical scrubber. However, with an increase in the spray density above 2 liter/m3 and with droplet diameters greater than 1000 microns, the efficiency of the conical scrubber decreases, which is associated to an increase in the escape of a significant proportion of massive drops to the walls with a reduction in the scrubber reactor cross-section.  Bibl. 21, Fig. 4.
用湿式洗涤器中分散颗粒与液滴相互作用的运动学模型对含尘气流清洗过程进行建模
基于逆流气体分散流中颗粒相互作用的运动学方法,提出了在文丘里管超喷雾密度条件下湿式洗涤器中液滴对分散颗粒的清除过程的数学模型,该模型考虑了液滴与湿浆状液滴和从文丘里管进入湿式洗涤器的未捕获颗粒的混凝而产生的空间尺寸变化,对现有的工程模型进行了改进。利用所采用的数学模型进行计算的结果表明,在有可能用300-500微米的雾滴以1升/m3左右的比喷雾密度组织洗涤塔内的气流喷射时,1 - 2米宽的雾滴层既可以有效吸收未捕获的PM2.5固体颗粒,也可以有效吸收文丘里管中的浆状雾滴。浆液液滴从文丘里管喷射到湿式洗涤器中,以及由于与浆液液滴混凝而导致洗涤器液滴尺寸的增加,对含尘气流清洗的效率没有明显影响。应用所采用的数学模型计算了圆柱和锥形洗涤器中液滴对颗粒的捕获。由于液滴的停留时间随着逆流气流速度的增加而增加,锥形洗涤器中分散颗粒的气体净化效率似乎高于圆柱形洗涤器。然而,当喷雾密度大于2升/m3时,当液滴直径大于1000微米时,锥形洗涤器的效率降低,这与大量大液滴逃逸到壁上的比例增加有关,同时洗涤器反应器截面减小。圣经21,图4。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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