School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Environ Sci Pollut Res Int. 2023 Apr;30(19):55414-55423. doi: 10.1007/s11356-023-25989-4. Epub 2023 Mar 9.
As mining continues to increase in depth, the problem of pre-oxidation coal (POC) spontaneous combustion (PCSC) in deep mines is coming to the fore. The effects of thermal ambient temperature and pre-oxidation temperature (POT) on the thermal mass loss (TG) and heat release (DSC) characteristics of POC were studied. The results show that the oxidation reaction process is found to be similar among the coal samples. The majority of mass loss and heat release from the oxidation of the POC is in the stage III and decreases with increasing thermal ambient temperature, while the combustion properties change in the same way, indicating a consequent reduction in the risk of spontaneous combustion. The higher the POT, the more the critical POT tends to be at a lower POT at a higher thermal ambient temperature. It can be demonstrated that higher thermal ambient temperatures and higher POT lower the risk of spontaneous combustion of POC.
随着采矿深度的不断增加，深部矿井中预氧化煤（POC）自燃（PCSC）的问题日益突出。研究了热环境温度和预氧化温度（POT）对 POC 热质量损失（TG）和放热（DSC）特性的影响。结果表明，煤样的氧化反应过程相似。POC 氧化过程中的大部分质量损失和放热都发生在第三阶段，并随热环境温度的升高而降低，而燃烧性能也以相同的方式变化，表明自燃风险相应降低。POT 越高，在较高的热环境温度下，临界 POT 越趋于较低的 POT。可以证明，较高的热环境温度和较高的 POT 降低了 POC 自燃的风险。
