在不同的气体环境下,煤的减肥行为
Xian Wu1, Haojie Zhang1, Ronghao Xu1
1School of Safety Science and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China.
ACS omega
|October 6, 2025
概括
煤炭 是一种煤炭.
科学领域:
- 煤炭燃烧和自燃燃烧的使用.
- 化学动力学和反应机制.
- 材料科学与工程 材料科学与工程
背景情况:
- 煤炭的自发燃烧 (SC) 是采矿中的一个重大安全隐患.
- 在不同的气体环境下了解煤的重量变化特征对于SC预防至关重要.
- 之前的研究已经探讨了煤炭氧化,但缺乏对各种大气层的详细动力学分析.
研究的目的:
- 为了研究焦炭在干燥空气,纯氧气和纯N2.2下的重量变化特征.
- 为了比较温度演变,减肥行为,气体产物,动力模型和激活能量.
- 阐明O2度和N2热解对煤炭自燃潜力的影响.
主要方法:
- 对煤进行编程温度减肥实验.
- 分析减肥率,加热率和气体产品 (CO,CO2) 的演变.
- 动力模型的应用 (Avrami-Erofee) 和激活能量 (Ea) 的计算.
主要成果:
- 纯O2环境显示了最高的加热率,而空气的减重率始终高于O2.
- 2大气引起的体重减轻主要是通过90°C以上的热解.
- 在150°C以上的纯O2中,CO生成显著增加;N2从功能组热解中产生了较小的碳氧气体.
- 空气中的O2消耗反应遵循了Avrami-Erofee模型 (n=4).
- 在40-140°C范围内,二氧化碳的低激活能量比二氧化碳的产生更有利于二氧化碳的产生.
结论:
- 氧气度对煤炭氧化引起的体重减轻具有双重作用 (抑制/促进).
- 在N2大气中的热解有助于减肥.
- 这些发现提供了理论见解,以防止GOAF地区剩余煤的自发燃烧.
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