Based on the deep study of the mechanism of coal spontaneous combustion, this paper proposes new efficient inhibitors preventing coal spontaneous combustion from the perspective of inhibition of free-radical chain reactions. Chifeng coal samples were used as the research object, and six different types of antioxidants were selected as the inhibitor for low-temperature oxidation experiments. A comparison study of the gas product concentration before and after inhibition was conducted; its inhibition mechanism was also studied and analyzed. On the basis of this, the specific indicators, such as cross-point temperature (CPT), apparent activation energy, active functional groups, and an inhibitory rate at 100 °C were used to compare the inhibition effect of antioxidants. The experiments indicate that, except for oxygen-scavenger ascorbic acid, another five antioxidants (butylated hydroxytoluene, BHT; triphenyl phosphite, TPPI; 2,2,6,6-tetramethyl-1-piperidine-noxyl free radical, TEMPO; edetic acid, EDTA; and phytic acid, PA) exhibit a good inhibition effect, and the order of inhibitory effect is R_TEMPO> R_BHT> R_EDTA> R_TPPI> R_PA, indicating that TEMPO has the best inhibition effect with the activation energy of coal oxidation increased by 14.79 kJ·mol^–1, and the inhibition rate reached 73.08%. The research results provide new ideas for the prevention and control of coal spontaneous combustion.

中文翻译：

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抗氧化剂对煤自燃的抑制作用

在深入研究煤自燃机理的基础上，从抑制自由基链反应的角度出发，提出了新型有效的煤自燃抑制剂。以赤峰煤样品为研究对象，选择了六种不同类型的抗氧化剂作为低温氧化实验的抑制剂。进行了抑制前后气体产物浓度的比较研究。还对其抑制机理进行了研究和分析。在此基础上，使用特定的指标（例如交叉点温度（CPT），表观活化能，活性官能团和在100°C下的抑制率）来比较抗氧化剂的抑制作用。实验表明，除氧清除剂抗坏血酸外，R _TEMPO > R _BHT > R _EDTA > R _TPPI > R _PA，表明TEMPO具有最佳的抑制作用，煤氧化的活化能增加14.79 kJ·mol ^–1，抑制率达到73.08％。研究结果为防治煤自燃提供了新思路。