基于耗氧量的煤低温氧化反应机制的试验

Experimental on Low- temperature Oxidation Mechanism of Coal Based on Oxygen Consumption

煤的常温氧化对采空区煤自热过程以及自燃"三带"的划分具有重要意义。利用实时监测反应装置,模拟采空区遗煤在常温下的氧化过程。根据氧气浓度以及耗氧速率的变化,对采空区煤的氧化机制进行分析研究;同时考察了混合粒径对氧化过程的影响。试验表明混合粒径煤样的耗氧速率并不是各单一粒径耗氧速率的线性叠加,且煤的氧化过程随着氧化时间的增加表现出明显的阶段性。根据不同阶段的反应机制,可采用不同的防灭火方法进行控制。

The coal oxidation at normal temperature plays an important part in coal self- heating and the partition of ＂the three zones＂ of spontaneous combustion in goaf. In this paper, the real - time monitoring reactor was used to simulate the process of residual coal oxidation at ambient temperature in goaf. Based on the change of the oxygen concentration and the oxygen consumption rate, the mechanism of coal oxidation in goaf was analyzed. At the same time, the effect of hybrid particle sizes on the oxidation process was investigated. The experiments showed that the oxygen consumption rate of coal samples with hybrid particle sizes was not the linear superposition of each single particle size group, and the oxidation process of coal showed obvious phases with oxidation time increasing. According to the reaction mechanism in different phase, different method could be used for fire prevention.