Experimental study on bubble size distribution of gas-liquid mixed pump air flotation system

doi:10.19965/j.cnki.iwt.2022-0199

Abstract

Abstract:

The gas-liquid mixed pump combined with dissolving air floating system can produce small particle size microbubbles，which has a wide application prospect in dyeing，food，environmental protection and other industrial wastewater treatment. In order to optimize the bubble particle size distribution cloud and provide a more realistic computational fluid dynamics（CFD） fluid model，a pilot air flotation cell combined with microscopic camera was chosen to investigate the bubble particle size distribution in the mixing and separation zones under different factors to investigate the distribution of bubble size in the mixing and separation zones of the air flotation cell. Hydraulic load 2.67-8 m³/（m²·h），dissolved air pressure 0.28-0.36 MPa，reflux ratio 20%-80%，inlet air ratio 2%-10% were controlled. The results showed that the particle size of most of the bubbles under the control conditions was maintained at 50-100 μm，and the smallest particle size was up to 20 μm. The optimum operating parameters of the system were 5.33 m³/（m²·h） hydraulic load，0.34 MPa dissolved gas pressure，40% reflux ratio，and 6% inlet air ratio，and the oil removal effect of the system was up to 73% under these conditions.

Key words: gas liquid mixing pump, air floatation, microbubbles, particle size distribution

摘要：

气液混合泵溶气气浮系统能产生较小粒径的微气泡，在印染、食品、环保等工业废水处理中有着广泛的应用前景。为了优化气泡粒径分布云图以及提供更真实的计算流体动力学（CFD）流体模型，选用中试气浮池结合显微摄像在不同因素下探究气浮池混合区与分离区的气泡粒径分布。控制水力负荷为2.67~8 m³/（m²·h），溶气压力为0.28~0.36 MPa，回流比为20%~80%，进气比为2%~10%，结果表明，此条件下多数气泡粒径维持在50~100 μm，最小粒径可达20 μm，系统微气泡最佳状态的运行参数：水力负荷为5.33 m³/（m²·h），溶气压力为0.34 MPa，回流比为40%，进气比为6%，在此条件下该系统的除油率可达73%。

关键词: 气液混合泵, 气浮, 微气泡, 粒径分布

CLC Number:

X703.3

Jinxiang FU, Maiyu LI, Yongchao LU, Yanping ZHANG, Kun YOU, Xing JIN, Di LUO, Yongyong WANG. Experimental study on bubble size distribution of gas-liquid mixed pump air flotation system[J]. Industrial Water Treatment, 2023, 43(1): 115-123.

傅金祥, 李麦雨, 鲁勇朝, 张延平, 由昆, 金星, 罗迪, 王勇勇. 气液混合泵气浮系统气泡粒径分布实验研究[J]. 工业水处理, 2023, 43(1): 115-123.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-0199

https://www.iwt.cn/EN/Y2023/V43/I1/115

Figures/Tables 18

Fig.1 Flow chart of air flotation tank

Fig.2 Particle size distribution under different hydraulic loads in mixing zone

Fig. 3 Average particle size at different locations of mixing zone under different hydraulic load conditions

Fig.4 Particle size distribution under different hydraulic loads in separation zone

Fig. 5 Average particle size at different locations of separation zone under different hydraulic load conditions

Fig.6 Particle size distribution under different dissolved gas pressure in mixing zone

Fig. 7 Average particle size of different sampling points in the mixing area under different dissolved gas pressure

Fig.8 Particle size distribution under different dissolved gas pressure in separation zone

Fig. 9 Average particle size at different positions of separation zone under different dissolved gas pressure

Fig.10 Particle size distribution under different reflux ratio in mixing zone

Fig. 11 Average particle size of different sampling points in mixing zone under different reflux ratio

Fig.12 Particle size distribution under different reflux ratio in separation zone

Fig. 13 Average particle size of different sampling points in the separation area under different reflux ratio

Fig.14 Particle size distribution under different inlet air ratio in mixing zone

Fig. 15 Average particle size at different sampling points in mixing zone under different inlet air ratio

Fig.16 Particle size distribution under different inlet air ratio in separation zone

Fig. 17 Average particle size of different sampling points in the separation area under different inlet air ratio

Fig. 18 Oil removal effect of air flotation

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