煤低温氧化CO与CO<sub>2</sub>的同位素指标研究

刘向群; 王福; 张朝阳; 董轩萌; 高湛翔

煤低温氧化CO与CO₂的同位素指标研究

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出版历程
- 发布日期: 2023-04-19

Study on isotopic indexes of CO and CO2 in low temperature oxidation of coal

摘要

摘要: 煤自燃火灾是矿井生产过程中的重大灾害之一，对矿井安全生产存在巨大威胁；煤自燃是一个复杂的氧化过程，要经历不同的氧化阶段，故要建立相应指标来判断不同的煤氧反应阶段。利用程序升温-气相色谱联用实验，分析了长焰煤自燃氧化过程中标志气体随温度变化规律，依据升温氧化实验数据，将煤自燃划分为4个阶段；以φ（CO）/φ（CO₂）和第三火灾系数R3作为辅助指标，对煤氧反应阶段进行划分；同时通过检测低体积分数CO、CO₂中氧同位素的丰度值，得到气体产物中δ18O（氧同位素值）随温度变化的规律，并以δ18O为指标，根据δ18O变化规律将煤自燃划分4个阶段。
- 煤自燃 /
- 低温氧化 /
- CO /
- CO2 /
- 同位素
Abstract: Coal spontaneous combustion fire is one of the major disasters in the process of mine production, which threatens the safety of mine production. Spontaneous combustion of coal is a complex oxidation process, which has to go through different oxidation stages, so it is necessary to set up corresponding indexes to judge different stages of coal-oxygen reaction. The rule of index gas changing with temperature in the process of spontaneous combustion and oxidation of long flame coal was analyzed by temperature programmed-gas chromatography （ＴＧ－ＧＣ）. According to the experimental data of temperature oxidation, spontaneous combustion of coal can be divided into four stages. Using φ（CO）/φ（CO₂） and the third fire coefficient R3 as auxiliary indexes, the stages of coal-oxygen reaction were divided. At the same time, the law of δ18O（ｏｘｙｇｅｎｉｓｏｔｏｐｅ） in gas products changing with temperature is obtained by measuring the oxygen isotope abundance in CO and CO₂ of low volume fraction, and the coal spontaneous combustion is divided into four stages according to the law of δ18O.

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参考文献(17)

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