Optimization analysis of dust field under the comprehensive control of air flow control device and jet air curtain at fully mechanized excavation face

To solve the problem of serious pollution and dust accumulation under the traditional mixed ventilation of the fully mechanized excavation face, the idea of using the air flow control device of the air outlet and the jet air curtain of the exhaust outlet to optimize the dust field is proposed. Taking the fully mechanized excavation face of a mine in northern Shaanxi as the research object, a finite element model of the airflow-dust gas-solid coupling field was established, and the influence of the diameter and right angle of the air flow control device and the width, speed and opening angle of the air curtain outlet on the dust field was analyzed, and orthogonal experiments were designed to determine the best comprehensive control scheme. The results show that under the ventilation system of the fully mechanized excavation face, when the diameter of the control device is 1.2 m, the right deviation angle of the control device is 9°, the width of the air curtain outlet is 0.14 m, the speed of the air curtain outlet is 7 m/s, and the angle of the air curtain outlet is 60°, the dust mass concentration at the driver’s position and the average dust mass concentration at the height of the pedestrian breathing belt are reduced by 91.7% and 74.9%, respectively, and the test error is less than 10%, effectively improving the ventilation environment.