关键词: 综掘工作面　 粉尘治理　 扰动风流　 高能细泡　 抑尘效率

Abstract: In order to solve the problem that the existing foam dust removal technology in fully mechanized mining face is greatly influenced by the head-on wind and underground wind and water parameters,a high-energy fine bubble dust suppression system composed of a new fine bubble generator,a diverter and an adjustable umbrella-shaped anti-blocking nozzle is developed. The new fine bubble generator consists of a water jet premixing and diluting section,a gas-jet double-pressure flow assisting section and a mixer high-efficiency foaming section. By building a multi-characteristic experimental platform of fine bubbles based on phase Doppler particle analysis technology,the macro-and micro-wind resistance parameters of fine bubbles with different axial opening and closing sizes of nozzles and different bubble generating liquid concentrations were tested,and the relationship between foaming multiple of fine bubbles and wind resistance was clarified,revealing the action mechanism of disturbed airflow on fine bubbles. The results show that the atomization angle of the nozzle decreases sharply with the increase of the axial opening and closing size of the nozzle,and the optimal axial opening and closing size of the nozzle is 2 mm by considering the farthest range and the maximum coverage radius of the fine bubbles. The attenuation rate of airflow disturbance on bubble velocity and the change rate of bubble particle size both decrease at first and then increase with the increase of foaming multiple. Combining foaming multiple and wind resistance,the optimal concentration of bubble generating liquid is 0. 9%. Based on the study results and combined with the field situation,a dust suppression system was established for the 15115 fully mechanized mining face in a mine. The application results showed that the fine bubbles did not turn back with the reverse airflow,and the maximum dust suppression rate of fine bubbles on the fully mechanized mining face was 94. 3% and 91. 8%,which realized the accurate coverage of the tunneling dust source. 

Key words: fully mechanized mining face,dust control,disturbed airflow,high-energy fine bubbles,dust suppression efficiency