Discussion on the unsealing conditions of coal spontaneous combustion fire area
Through the whole process experiment of coal spontaneous combustion ignition,the paper deeply analyzes the extinguishing conditions of fire area stipulated in Article 279 of the current Coal Mine Safety Regulations,probes into the possible problems in practical application,and puts forward corresponding suggestions for modification.The experiment results show that when the O2 concentration drops below 5％after coal fire,the concentration of the index gas of coal spontaneous combustion rapidly decreases,but it can still maintain the smoldering state,and it will reignite soon after resuming oxygen supply,indicating that the index gas measured under this condition cannot accurately characterize the state of coal spontaneous combustion.Therefore,it is considered that the provision that limits the measurement of index gas to"reducing the O2 concentration in the air within the fire zone to below 5.0％"is inappropriate according to the extinguishing conditions of the fire zone stipulated in Article 279 of the Coal Mine Safety Regulations(2022 edition),or it can be changed to the provision:"the air in the fire zone meets the fresh air requirements,that is,the concentration of O2 is 21％".
spontaneous combustion ignitionindex gasO2 concentrationfire area unsealingreignition
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