Study of atomization characteristics and dust suppression effect of micro-nano bubble enhanced ultrasonic dry fog in excavation working face

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-05-09 DOI:10.1016/j.tust.2025.106713

Xinzhe Wang , Pengfei Wang , Gaogao Wu , Yongjun Li

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Abstract

To optimize spray-based dust capture efficiency at coal mine working face, a novel micro-nano bubble enhanced ultrasonic dry fog dust suppression approach was developed. The characteristics of micro nano bubbles water were studied through wettability experiments and the dust suppression effect of micro nano bubbles water and tap water was compared by using the custom-designed spray dust suppression experimental platform. Experimental results indicate that micro-nano bubble water increases the concentration of negative ions around the spray area compared to tap water. Additionally, the surface tension of micro-nano bubble water is 9.3 mN/m lower than that of tap water and the contact angle of micro-nano bubble water with coal particles is 5.76° smaller than that of tap water. Application findings of tunnel working face confirm that the micro-nano bubble ultrasonic dry fog purification system achieving average suppression efficiencies of 60.43 % for total dust and 44.84 % for respirable dust, representing a relative improvement of over 30 % compared to the conventional purification system. Moreover, the micro-nano airflow dry fog purification system consumes water at an average rate of 5.13 L/min, which is 2.43 L/min lower than the conventional water curtain purification system, indicating a relative reduction in water usage by more than 30 %. Evidently, the micro-nano bubble ultrasonic dry fog purification system delivers effective dust control and reduce water consumption.

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微纳气泡增强超声干雾在开挖工作面雾化特性及抑尘效果研究

为了优化煤矿工作面喷雾降尘效率，提出了一种新型的微纳气泡增强超声干雾降尘方法。通过润湿性实验研究了微纳气泡水的特性，并利用定制的喷雾抑尘实验平台对微纳气泡水和自来水的抑尘效果进行了比较。实验结果表明，与自来水相比，微纳气泡水增加了喷雾区域周围负离子的浓度。微纳气泡水的表面张力比自来水低9.3 mN/m，与煤颗粒的接触角比自来水小5.76°。隧道工作面应用结果证实，微纳气泡超声干雾净化系统对总粉尘的平均抑制效率为60.43%，对呼吸性粉尘的平均抑制效率为44.84%，相对于传统净化系统提高30%以上。此外，微纳气流干雾净化系统的平均耗水量为5.13 L/min，比常规水幕净化系统低2.43 L/min，用水量相对减少30%以上。显然，微纳气泡超声干雾净化系统具有有效的粉尘控制和降低水的消耗。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.