Study on the effect of ultrasonic degassing in water

doi:10.11949/0438-1157.20221664

Abstract

Abstract:

Ultrasonic degassing technology has practical or potential application value in chemical industry, metallurgy, environment, and geothermal energy utilization. However, there are few reports on ultrasonic degassing in air-water system. Therefore, this paper carried out the experimental study of ultrasonic degassing in the air-water system. The actual effect of ultrasonic on gas removal was studied under different operating parameters, such as ultrasonic electric power and frequency. At the same time, ultrasonic technology and vacuum degassing technology were combined to explore the degassing effect. The results show that the degassing effect decreases with the increase of ultrasonic frequency under the experimental conditions. The degassing effect increases with the increase of ultrasonic electric power. Compared with vacuum degassing alone, ultrasonic degassing combined with vacuum degassing can significantly improve the degassing effect. Under flow conditions, the degassing effect decreases with the increase of flow rate. The acoustic cavitation phenomenon in ultrasonic process was studied by KI experiment and visualization method. The results can provide basic guidance for the industrial application of ultrasonic degassing.

Key words: ultrasonic, gas, flow, vacuum degassing, reaction

摘要：

超声波脱气技术在化工、冶金、环境以及地热能利用等领域具有现实或潜在的应用价值。但是，目前对空气-水系统中超声波脱气规律的研究还相对较少。开展了空气-水系统中的超声波脱气实验研究，在不同的操作参数下，如超声波电功率、频率等，研究了超声波对气体脱除的实际效果。同时将超声波技术与真空脱气技术相结合，探究其脱气效果。结果表明，在实验条件下，随着超声波频率的升高，脱气效果下降；随着超声波电功率的升高，脱气效果提升；与单独真空脱气相比，超声波与真空脱气结合时，脱气效果显著提升；在流动条件下，随着流量增加，脱气效果降低。通过KI实验和可视化方法对超声过程中的声空化现象进行了研究，研究结果可为超声波脱气的工业应用提供基础指导。

关键词: 超声波, 气体, 流动, 真空脱气, 反应

CLC Number:

TQ 028.8

Qianqian WANG, Mingyan LIU, Yongli MA. Study on the effect of ultrasonic degassing in water[J]. CIESC Journal, 2023, 74(4): 1693-1702.

王倩倩, 刘明言, 马永丽. 水中超声波脱气的效应研究[J]. 化工学报, 2023, 74(4): 1693-1702.

Figures/Tables 15

Fig.1 Schematic setup of the ultrasonic degassing experiment

Fig.2 Comparison of temperature difference of water with or without temperature control

Fig.3 Variation of dissolved oxygen concentration as a function of irradiation time during ultrasonic irradiation in the frequency range of 20—100 kHz

Fig.4 Variation of temperature difference as a function of irradiation time during ultrasonic irradiation in the frequency range of 20—100 kHz

Fig.5 Variation of dissolved oxygen concentration as a function of irradiation time during ultrasonic irradiation in the ultrasonic electric power range of 13.2—26.4 W

Fig.6 Variation of temperature difference as a function of irradiation time during ultrasonic irradiation in the ultrasonic electric power range of 13.2—26.4 W

Fig.7 Dependence of the dissolved oxygen concentration on the ultrasonic electric power when water is irradiated with ultrasound at frequencies at 20—100 kHz

Fig.8 The bubble size distribution with different ultrasonic time in the ultrasonic water under different ultrasonic electric power

Fig.9 Variation of dissolved oxygen concentration as a function of irradiation time under different flow rates

Fig.10 Variation of dissolved oxygen concentration as a function of irradiation time during ultrasonic under different ultrasonic electric power (25 ml·min-1)

Fig.11 Variation of dissolved oxygen concentration as a function of irradiation time under different vacuum degrees

Fig.12 Variation of I3- absorbance as a function of irradiation time under different ultrasonic electric power (20 kHz)

Fig.13 Variation of I3- absorbance as a function of irradiation time under different ultrasonic frequencies

Fig.14 Photograph of the ultrasonic cavitation under different ultrasonic frequencies (26.4 W)

Fig.15 Photograph of the ultrasonic cavitation under different ultrasonic electric power (20 kHz)

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