Analysis of gas fluctuation characteristics in a closed fire zone under atmospheric disturbance

doi:10.16265/j.cnki.issn1003-3033.2019.12.010

Abstract

Abstract: In order to prevent gas explosion induced by closed fire zones, with large underground mines as research object, a gas pressure fluctuation model, an air leakage model and a gas concentration prediction model were established according to gas emission amount and structural characteristics of mines. Then, variation law of gas concentration in inner areas due to atmospheric disturbance was studied under coupling influence of pressure difference, fire zone volume, wind resistance, gas emission amount and sealing timing. The results show that pressure difference between inside and outside of closed fire zones will change periodically due to atmospheric fluctuation, and gas concentration is determined by zone volume and gas emission amount. Among all factors, wind resistance is a vital one that affects fire zone's ability to withstand disturbance of atmospheric fluctuation, and an increase of it will shorten time for gas concentration to pass explosion limit while an reduction of zone volume can shorten explosion period.

Key words: closed fire zone, pressure difference, gas concentration, atmospheric disturbance

CLC Number:

X936

DUAN Yulong, WANG Shuo, YANG Yanling, LI Yuanbing, WANG Wenhe, JIANG Xinsheng. Analysis of gas fluctuation characteristics in a closed fire zone under atmospheric disturbance[J]. China Safety Science Journal, 2019, 29(12): 59-65.

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