In order to effectively control the spontaneous combustion of coal in closed coal storage yards and reduce coal mine safety accidents,this paper establishes a CO2 inerting protection system device and determines the amount of CO2 inerting gas,the number of nozzles,and the arrangement method.The results show that within the required inert protection time,CO2 gas with different flow rates can quickly cool down the coal storage yard,thereby avoiding spontaneous combustion of the coal body.After comparative application,it was found that the time required for CO2 to achieve inerting is 295 s,which is much shorter than N2.In addition,the gas protection device is easy to maintain,the system has low operating costs,and high cost-effectiveness.
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