Mine fire caused by coal spontaneous combustion is one of the main safety problems in mining. For the purpose of developing a more effective inhibitor to suppress the coal spontaneous combustion, a compound deoxidization gel foam inhibitor was proposed by combining sodium dithionite deoxidizer with gel foam. An experimental platform was self-built to evaluate the suppression characteristic of deoxidization gel foam. Experimental results showed that the deoxidization gel foam reduced the oxygen concentration to below 14% within 180 minutes. STA-FTIR test indicated that the deoxidization gel foam raised the active temperature from 250.57°C to 275.18°C and reduced CO₂ absorption peak from 0.2926 to 0.2201 at the reaction temperature 20°C. The activation energy was also increased from 85.69 to 95.59 kJ·mol⁻¹ in thermal decomposition combustion that exhibited an excellent flame-retardant efficacy on the coal, especially at the low temperature stage. CH₃ and CH₂ were reduced by 56.86% and 47.17% processed by deoxidization gel foam. Meanwhile, the significant reduction in the content of reductive functional groups indicated that the new inhibitor had a strong suppression capacity for coal spontaneous combustion. Based on above research, it is believed that this study will lay an important foundation in the widespread application of deoxidization gel foam technology for coal spontaneous combustion prevention in underground mines.

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脱氧凝胶泡沫对煤自燃的抑制特性研究

煤自燃引起的矿井火灾是矿山开采的主要安全问题之一。为开发更有效的抑制煤自燃的抑制剂，提出将连二亚硫酸钠脱氧剂与凝胶泡沫相结合的复合型脱氧凝胶泡沫抑制剂。自建实验平台，评价脱氧凝胶泡沫的抑制特性。实验结果表明，脱氧凝胶泡沫在180分钟内将氧气浓度降低到14%以下。STA-FTIR测试表明，脱氧凝胶泡沫在反应温度20℃时，活性温度从250.57℃提高到275.18℃，CO ₂吸收峰从0.2926降低到0.2201。活化能也从 85.69 增加到 95.59 kJ·mol^-1在热分解燃烧中对煤表现出优异的阻燃效果，尤其是在低温阶段。 CH ₃和 CH ₂通过脱氧凝胶泡沫处理分别减少了56.86%和47.17%。同时，还原性官能团含量的显着降低表明新型抑制剂对煤自燃具有较强的抑制能力。基于以上研究，相信本研究将为脱氧凝胶泡沫技术在煤矿井下预防煤自燃中的广泛应用奠定重要基础。