Experimental Study on the Inerting Effect of Premixed Inert Gas of CO2 and N2 in Goaf

Fire Pub Date : 2024-07-01 DOI:10.3390/fire7070225

Bobo Shi, Jiaxing Zhao

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Abstract

As the conventional inert gas, it is used for the prevention and control of coal’s spontaneous combustion, mainly N2 and CO2. However, there is limited research focusing on the inerting effect of composite inert gas. This paper studied the impact of using a premixed inert gas (N2 accounted for 50%, 60%, 70%, and 80%) instead of CO2 on the inerting effect of nearly horizontal and gently inclined goaf by building a physical similarity simulation experiment platform. The experimental results showed that the inerting effect of premixed inert gas was better than that of CO2. For instance, in a nearly horizontal goaf, the inerting effect of the premixed inert gas was optimal when the N2 accounted for 70%. The average O2 concentration in the monitored area decreased from 9.7% with CO2 to 6.4%. In addition, in the gently inclined goaf, the premixed inert gas exhibited an accumulation state similar to CO2, primarily occurring in the lower part region adjacent to the working face. Furthermore, the accumulation state of premixed inert gas was inversely proportional to its inerting effect. This study has important reference significance for applying inert gas fire prevention and extinguishing technology in mines.

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关于 CO2 和 N2 预混合惰性气体在沼气池中的惰性效应的实验研究

作为传统的惰性气体，它主要用于防止和控制煤的自燃，主要是 N2 和 CO2。然而，针对复合惰性气体惰性效果的研究还很有限。本文通过建立物理相似性模拟实验平台，研究了使用预混惰性气体（N2 占 50%、60%、70% 和 80%）代替 CO2 对近水平和缓倾斜煤层惰性效果的影响。实验结果表明，预混惰性气体的惰性效果优于 CO2。例如，在近水平的煤层中，当 N2 占 70% 时，预混惰性气体的惰性效果最佳。监测区域的平均氧气浓度从二氧化碳的 9.7% 降至 6.4%。此外，在缓倾斜巷道中，预混惰性气体呈现出与 CO2 相似的积聚状态，主要发生在工作面附近的下部区域。此外，预混惰性气体的积聚状态与其惰性效果成反比。该研究对惰性气体防灭火技术在矿井中的应用具有重要的参考意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Fire

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