In-situ experimental study on poison gas diffusion in subway station under different ventilation modes
WANG Lei1,2, GUAN Jian2, PENG Meng2, ZHANG Kun2, HAN Hao1, KANG Jian1, XU Jia-yu2
1. State Key Laboratory of Nuclear Biological and Chemical Protection for Civilian, Research Institute of Chemical Defense, Beijing 102205, China; 2. School of Environment, Tsinghua University, Beijing 100084, China
Abstract:To fully understand the influence of ventilation system on poison gas diffusion in subway station, full scale experiments were carried out in a subway station in Beijing. Three-dimensional ultrasonic anemometer was used to analyze the flow field in the station under mechanical ventilation and emergency ventilation. Then the gas diffusion and subsiding of heavy gas were studied based on the methods of SF6 release and sampling in chronological order, which provide suggestions for emergency response. The results showed that in emergency ventilation, the wind speed was greater, which was 1.2~2 times that of mechanical ventilation.When SF6 diffused under mechanical ventilation, obvious settlement was observed, and SF6 was accumulated on the ground to form an area, concentration of which was higher than 50×10-6 for a long time. After the emergency ventilation was turned on, the settled SF6 accelerated upward transmission and quickly filled the whole station hall and the maximum concentration was more than 200×10-6. During emergency disposal, it was necessary to evacuate passengers to the upper or reverse area as soon as possible. It is strictly prohibited to open the emergency ventilation to avoid the diffusion of ground gas to the breathing area.
王磊, 关健, 彭猛, 张琨, 韩浩, 康健, 许嘉钰. 不同通风模式下地铁站毒气扩散的实地试验[J]. 中国环境科学, 2022, 42(3): 1082-1087.
WANG Lei, GUAN Jian, PENG Meng, ZHANG Kun, HAN Hao, KANG Jian, XU Jia-yu. In-situ experimental study on poison gas diffusion in subway station under different ventilation modes. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1082-1087.
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