Low-temperature exothermic oxidation characteristics and spontaneous combustion risk of pulverised coal
Low-temperature exothermic oxidation characteristics and spontaneous combustion risk of pulverised coal
复制标题
煤粉低温放热氧化特性及自燃风险
DOI：
10.1016/j.fuel.2019.04.108
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发表时间：
2019-09-15
期刊：
影响因子：
7.4
通讯作者：
Shu, Chi-Min
中科院分区：
文献类型：
--
作者：
Ren, Li-Feng;Deng, Jun;Shu, Chi-Min
为了研究煤粉的自燃危险性，采用C80微量热计系统测量了3种变质煤粉在不同氧浓度下的低温氧化热流，研究了煤粉的自燃危险性。结果表明，煤粉低温氧化放热过程具有明显的阶段性特征。随着温度的升高，RNM和QM煤粉的热流曲线先减小后增大再减小，而PSM煤粉的热流曲线先减小后增大。随着氧浓度的降低，热流曲线出现明显的滞后，特征温度升高。第一阶段释放的热量最少，而第三阶段释放的热量最多。氧浓度的降低大大减少了煤粉的放热。基于煤粉低温氧化放热特性，提出了一种煤自燃危险性指数。氧浓度降低和煤粉的高度变质大大降低了自燃危险指数。
To investigate the spontaneous combustion risk of pulverised coal, the low-temperature oxidation heat flow of three metamorphic pulverised coals was measured using a C80 microcalorimeter system at various oxygen concentrations to investigate the spontaneous combustion risk of pulverised coal. The results indicated that low-temperature exothermic oxidation of pulverised coal occurred in stages that had distinct characteristics. When the temperature increased, the heat flow curve of RNM and QM pulverised coals first decreased, then increased, and finally decreased, but the heat flow curve of the PSM pulverised coal first decreased and then increased. A considerable lag was observed in the heat flow curves with the decrease in the oxygen concentration, and the characteristic temperature increased. Stage 1 released the least heat, whereas stage 3 released the most heat. A decrease in the oxygen concentration considerably reduced the heat release of pulverised coal. A spontaneous combustion risk index was proposed on the basis of low-temperature oxidation heat release of pulverised coal. Decreased oxygen concentration and high metamorphism of pulverised coal considerably reduced the spontaneous combustion risk index.