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<p>The air supply distribution in gangue hills is non-uniform, resulting in different amount of oxygen provided to gangue, thereby affecting the gangue spontaneous combustion behavior. In this paper, the effect of O<sub>2</sub> flow rate in air supply on CO, CO<sub>2</sub> generation during spontaneous combustion of coal gangues selected from Guojiahe, Pingmei and Gaozhuang coal mine under 30–260&#xa0;°C was studied, subsequently the intrinsic component (ash, moisture, volatile and fixed carbon) and micro-structure variation in the gangue oxidation process was investigated. The results indicate that the variation of CO and CO<sub>2</sub> production rate with O<sub>2</sub> flow rate exhibited two-stage characteristic (i.e., oxygen-promotion stage and oxygen-saturation stage), the maximum value is reached when oxygen flow rate exceeds inflection point and then remain almost constant. The CO/CO<sub>2</sub> ratio decreases in oxygen-promotion stage, and remain unchanged in oxygen-saturation stage. During oxygen-promotion stage, the CO and CO<sub>2</sub> generation mainly comes from the oxidation of fixed carbon, the oxidation of aliphatic and aromatic hydrocarbons, and the cleavage of carbonyl and carboxyl groups. This exploration is helpful to predict and control the gangue spontaneous combustion under various oxygen flow rate.</p>

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Effect of O2 flow rate in oxygen–nitrogen mixture on carbon–oxygen gas generation during coal gangue spontaneous combustion

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Qigeng Zhou,
  • Botao Qin,
  • Dong Ma,
  • Yixuan Yang,
  • Zuoming Xu

摘要

The air supply distribution in gangue hills is non-uniform, resulting in different amount of oxygen provided to gangue, thereby affecting the gangue spontaneous combustion behavior. In this paper, the effect of O2 flow rate in air supply on CO, CO2 generation during spontaneous combustion of coal gangues selected from Guojiahe, Pingmei and Gaozhuang coal mine under 30–260 °C was studied, subsequently the intrinsic component (ash, moisture, volatile and fixed carbon) and micro-structure variation in the gangue oxidation process was investigated. The results indicate that the variation of CO and CO2 production rate with O2 flow rate exhibited two-stage characteristic (i.e., oxygen-promotion stage and oxygen-saturation stage), the maximum value is reached when oxygen flow rate exceeds inflection point and then remain almost constant. The CO/CO2 ratio decreases in oxygen-promotion stage, and remain unchanged in oxygen-saturation stage. During oxygen-promotion stage, the CO and CO2 generation mainly comes from the oxidation of fixed carbon, the oxidation of aliphatic and aromatic hydrocarbons, and the cleavage of carbonyl and carboxyl groups. This exploration is helpful to predict and control the gangue spontaneous combustion under various oxygen flow rate.