Linkage air-curtain dust-isolation technology of dust-removal system for rock roadway tunneling faces

ZHANG Lang; WANG Shuming; YAO Haifei; LIU Yanqing

doi:10.13272/j.issn.1671-251x.2025090021

Abstract：At present,the commonly used extraction-type dust-removal system in mine tunneling roadways causes local air volume loss during operation,and the air-curtain generator suffers from air-distribution problems that affect the air supply at the tunneling face.To address the problems of dust control and airflow regulation at rock roadway tunneling faces,a linkage air-curtain dust-isolation device was developed based on the extraction-type dust-removal system,which enabled the purified airflow from the dust-removal system to directly form a dust-blocking air curtain.A crescent-shaped guide vane was installed at the bend of the air duct in the air-curtain dust-isolation device.Numerical simulations verified that this design reduced fluid velocity loss by 17.11％,thereby decreasing the local air volume loss caused by the operation of the dust-removal system.A resistance-calculation formula for the linkage air-curtain dust-isolation device of the extraction-type dust-removal system was derived to provide a basis for selecting dust-removal fans.A roadway geometric model,a fluid-motion mathematical model,and a discrete-phase model of dust particles were established to numerically simulate the flow field and dust-migration patterns in the tunneling roadway.The results showed that when the air-curtain dust-isolation device was positioned 6 m from the tunneling face,with a pressure-extraction ratio of 1:1.1 and a gradually widened slit-shaped jet outlet,the dust concentration decreased from 4× 10-5 kg/m3 to 5 × 10-6 kg/m3 after passing through the air curtain,achieving a dust-reduction rate of 87.5％.The jet airflow was uniform and sufficient without mutual interference,confining high-concentration dust within a smaller space and preventing its diffusion.