The methane distribution law of closed fire zone when pumping inert gas
DUAN Yu-long
ZHOU Xin-quan
DING Xiao-lei
GONG Wu
CHEN Chen
REN Yan-li
Abstract：The distribution law of methane when pumping inert gas to closed fire zone were studied through numerical simulation, experiments and relating analysis. Using CFD software Fluent to do numerical simulation, simulated experiments were carried out in an experimental laneway, and the minimum safety and effective pumping velocities of nitrogen and carbon dioxide were calculated based on one math model. Pumping velocity has great effect on methane distribution, it's also one of the main factors to cause methane accident such as fire or explosion. Inert gas and methane blend slowly when pumping velocity is small, there is a dangerous high concentration methane layer which is possible to cause fire or explosion accident in the front of laneway; Inert gas can blend quickly with methane when pumping velocity is large,and the effect of dilution and inerting is observably. The methane concentration of the whole laneway is safe.
Keywords：closed fire zoneinert gasmethanedistribution
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 80-84 )