Forecast research on effectively increasing outdoor air rate of underground railway station during period of epidemic prevention and control

During the period of epidemic prevention and control, with the increase of enterprises and institutions returning to work, the number of underground railway passengers is increasing. Increasing the outdoor air rate of underground railway station is a key measure to reduce the concentration of harmful substances in the station and ensure the health and safety of passengers. Based on the field measurement of the air pressure of the screen door, proposes a prediction model of outdoor air intake considering the combined local resistance of the screen door, the entrance and exit, and the stairs. The prediction results show that in the stage of train departure from the station, 8 screen doors at the two ends of the station are delayed to close for 1 min, without adding equipment or modifying existing equipment, the outdoor air rate of the underground railway station can be increased by about 33 653 m3/h, accounting for 94% of the maximum design outdoor air rate.