Calculation of oxygen concentration in vehicle hold on vehicle fire

doi:10.16265/j.cnki.issn1003-3033.2019.01.022

Abstract

Abstract: In order to explore the oxygen concentrations variation in vehicle hold in the case of heavy-duty diesel fire, firstly the oxygen consumption was analyzed for each type of vehicle fire. And then, based on the thermal balance, mass flow balance, and general ventilation equation, a theoretical calculation model of oxygen concentration was built for an inconstant oxygen consumption source. Finally,the model was applied to a certain landing platform dock. The results show that without smoke emission, the oxygen concentration in the vehicle hold decreases slowly in the early stage of vehicle fire, that after 200 seconds, the oxygen concentration decreases severely, that after 587 seconds the fire ceases because the volume fraction of oxygen in the vehicle hold is less than 14%, that with smoke emission and ventilation, the temperature increases obviously after 120 seconds, the temperature inside the vehicle hold reaches 100 ℃ after 240 seconds, that after 120 seconds, the oxygen concentration in the vehicle hold starts to decrease rapidly, and the oxygen concentration is lower than the threshold for human working after 270 seconds, and that the model is an effective tool for analyzing the temperature and oxygen concentration, and giving technical support for the personnel evacuation in the case of vehicle fire.

Key words: ventilation, vehicle hold, oxygen concentration, vehicle fire, smoke emission

CLC Number:

X962

FANG Min, SHEN Henggen, CHEN Hongchao, FEI Hua. Calculation of oxygen concentration in vehicle hold on vehicle fire[J]. China Safety Science Journal, 2019, 29(1): 132-137.

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