School of Safety and Emergency Management,Taiyuan University of Technology,Taiyuan ,China

为分析Na、Mg、Al、K、Ca、Mn、Zn七种金属元素对烟煤自燃特性的影响，选用含7种代表性的金属离子的氯盐与硫酸盐，每100 g许疃烟煤添加1 g无机盐；通过耗氧分析、差示扫描量热法（DSC）和阻化率测定对比各金属元素对煤低温氧化的阻化效果；计算氧化动力学参数，并结合自由基反应理论，分析了7种金属元素对煤自燃作用机制。研究结果表明，Mg、Zn、Ca、Al、K、Na等元素阻化率在9.5%～57.9%，在60～180 ℃的低温氧化活化能最大增加29.6%，上述金属无机盐与煤分子结合生成稳定的络合物，增强了煤中活性结构的稳定性，也可捕捉煤中羟基自由基等活性分子，抑制煤的氧化。Mn元素因多价态之间转换所造成的电子传递对煤自燃有一定的促进效果。

Two kinds of inorganic salts with 7 representative metal ions were selected for studying their inhibition effect on spontaneous combustion of coal.100 g Xutuan bituminous coal was treated by 1g additives.Oxygen consumption,DSC and inhibition rate were compared before and after treatment for evaluating their inhibit effect during low-temperature stage.Oxidation kinetic parameters was calculated.Combined with free radical theory,the mechanism that metal elements influence on spontaneous combustion of coal was presented.The results showed that the inhibition ratios of Mg,Zn,Ca,Al,K and Na were between 9.5% and 57.9%.The maximum activation energy of low temperature during 30～180 ℃ increased by 29.6%.The mentioned metal inorganic salts reacted with coal molecules to form stable complexes and enhanced the stability of active structures.It can also inhibit coal oxidation by capturing active molecules such as hydroxyl radicals.Besides,the electron transfer caused by the conversion of manganese ion under polyvalent states has a certain promoting effect on coal spontaneous combustion.