黄学满. 无烟煤氧化放热分段特性及基团转化机制研究[J]. 煤矿安全,2024,55(6):111−116. doi: 10.13347/j.cnki.mkaq.20240122
    引用本文: 黄学满. 无烟煤氧化放热分段特性及基团转化机制研究[J]. 煤矿安全,2024,55(6):111−116. doi: 10.13347/j.cnki.mkaq.20240122
    HUANG Xueman. Segmented exothermic characteristics and functional group transformation mechanism of anthracite oxidation[J]. Safety in Coal Mines, 2024, 55(6): 111−116. doi: 10.13347/j.cnki.mkaq.20240122
    Citation: HUANG Xueman. Segmented exothermic characteristics and functional group transformation mechanism of anthracite oxidation[J]. Safety in Coal Mines, 2024, 55(6): 111−116. doi: 10.13347/j.cnki.mkaq.20240122

    无烟煤氧化放热分段特性及基团转化机制研究

    Segmented exothermic characteristics and functional group transformation mechanism of anthracite oxidation

    • 摘要: 煤的氧化自燃严重威胁矿井的安全生产,为了进一步揭示基于活性基团转化的煤氧化分段产热特性及产生机理,研究了新桥无烟煤的氧化过程中放热特性的演变及其分段性,并利用原位傅里叶红外光谱技术,从官能团转化探讨了导致新桥无烟煤氧化过程出现分阶段的原因。结果表明:新桥无烟煤的氧化自热的过程呈现明显的2个阶段;低温阶段的放热量较少,氧化程度的加深促进放热量累积;达到130 ℃的临界温度后,氧化放热速率加快,放热量明显增加;由初始放热温度升至临界温度、从临界温度到200 ℃的放热量分别为127.42、572.36 J/g;新桥无烟煤放热过程分段性的根本原因在于活性基团−OH和−COOH在不同反应温度下的生成、消耗以及持续的热化学转化过程,从而导致热量的逐渐积累释放。

       

      Abstract: Spontaneous combustion of coal poses a significant threat to the safety of mining operations. In order to further reveal the coal oxidation stage heat production characteristics and mechanism based on active group transformation, the evolution of exothermic characteristics and its stage property during the oxidation process of Xinqiao anthracite were studied. In addition, in situ Fourier infrared spectroscopy was used to discuss the reasons leading to the oxidation stage of Xinqiao anthracite from the functional group transformation. The results show that the oxidation and self-heating process of Xinqiao anthracite presents two distinct stages. The heat release in the low temperature stage is less, and the deepening of oxidation degree promotes the accumulation of heat release. When the critical temperature reaches 130 ℃, the heat release rate of oxidation accelerates and the heat release increases obviously. From the initial heat release temperature to the critical temperature, and from the critical temperature to 200 ℃, the heat release heat is 127.42 and 572.36 J/g, respectively. The fundamental reason for the staged heat release process of Xinqiao anthracite lies in the formation and consumption of the active groups −OH and −COOH at different reaction temperatures and the continuous thermochemical transformation process. This leads to a gradual accumulation and release of heat.

       

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