不同通风模式下地铁站毒气扩散的实地试验

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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.

Key words： subway station pollutant diffusion in-situ experiment ventilation system

Received: 01 August 2021

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X948

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	Articles by authors
	WANG Lei
	GUAN Jian
	PENG Meng
	ZHANG Kun
	HAN Hao
	KANG Jian
	XU Jia-yu

Cite this article:

WANG Lei,GUAN Jian,PENG Meng等. In-situ experimental study on poison gas diffusion in subway station under different ventilation modes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1082-1087.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1082

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