Abstract: In order to explore the key technologies of ventilation in the power cabin of a long—distance comprehensive pipe gallery, experimental testing and numerical simulation research were conducted on the power cabin and gas cabin of a certain comprehensive pipe gallery in Beijing. Research has shown that there is significant air leakage along the ventilation of the power cabin, mainly occurring at escape exits and branch pipe galleries. The air leakage rate for a single escape exit is about 5.6%, and the air leakage rate for a single branch pipe gallery is about 8.4%. During long—distance ventilation in the power cabin, the cross—sectional wind speed should be maintained above 0.1 m/s. If the ventilation zone is long or there are many branch pipe galleries, an additional jet fan with an air volume of 30% of the total air volume should be installed every 200 m. Ventilation with a length of 600 m or less can be achieved through natural intake and mechanical exhaust, while ventilation with a length of 600 m or more should be achieved through mechanical intake and mechanical exhaust. The resistance of the pipe gallery is mainly generated at the inlet section and the fire door. The resistance at the inlet section is between 165 Pa and 200 Pa, and the resistance at the fire door is about 35 Pa. During long—distance ventilation, the resistance along the way should also be considered, and the resistance coeffcient along the way is about 0.68.

Key words: comprehensive pipe gallery, gas tank, electric cabin, ventilation zoning, cross section wind speed, testing, numerical simulation