School of Safety Science and Engineering, Changzhou University
College of Safety Science and Engi⁃neering, Henan Polytechnic University
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization
School of Energy Science and Engineering, Henan Polytechnic University

目的目的为了探究采空区破碎煤在应力状态下的氧化自燃特性,方法方法采用荷载加压煤自燃特性参数测定装置,研究不同预氧化温度破碎煤在不同轴压状态下的自燃特性,分析破碎煤在氧化过程的耗氧速率、特征温度点、气体生成和表观活化能等特征参数变化规律。结果结果结果表明:轴压会增强煤的自燃特性,具体表现为耗氧速率增加,CO和C2H4气体体积分数增大,氧化特征温度点前移,表观活化能减小;轴压为0,4MPa时,预氧化温度70℃煤样的氧化特性最强,轴压为8MPa时,预氧化温度升高导致煤样的氧化特性降低;结合耗氧速率、指标气体和表观活化能的变化,表明预氧化温度70℃的煤自燃倾向性更高,更易复燃。结论结论(1)不同预氧化温度煤样的自燃特性在轴压的影响下表现一致:轴压会增强煤的氧化特性,更容易到达快速氧化阶段。(2)不同轴压下预氧化温度对煤样的自燃特性影响存在差异:预氧化温度升高反而会降低煤样的氧化特性,表明在高轴压影响下煤体预氧化温度越高,其氧化特性越弱。

Objectives To study the spontaneous combustion characteristics of crushed coal at different pre-oxidation temperatures under various stress conditions, Methods a uniaxial compression device equipped with a temperature-programmed oxidation device (UCTP) was used to analyze the characteristic parameters such as oxygen consumption rate, characteristic temperature points, gas production, and activation energy changes during the oxidation process. Results The experimental results showed that uniaxial compression en‑hanced the oxidation characteristics of the coal samples, as evidenced by the increase in oxygen consump‑tion rate, the higher concentration of CO and CH gases, the forward shift of characteristic temperature points, and the decrease in activation energy. When the uniaxial compression was 0 MPa and 4 MPa, the oxidation characteristics of the pre-oxidized 70 ℃ coal samples were the strongest. At 8 MPa, the increase in pre-oxidation temperature led to a decrease in the oxidation characteristics of the coal samples. Combining the changes in oxygen consumption rate, index gases, and activation energy, it was found that the sponta‑neous combustion tendency of pre-oxidized 70 ℃ coal was higher and more prone to reignition. Conclu⁃sions (1) The spontaneous combustion characteristics of coal samples with different pre-oxidation tempera‑tures behaved consistently under the influence of axial pressure. Specifically, uniaxial compression en‑hanced the oxidation characteristics of the coal, making it more likely to reignite and progress to the rapid oxidation stage. (2) The effects of pre-oxidation temperature on coal’s spontaneous combustion characteris‑tics under different axial pressures varied. Increasing the pre-oxidation temperature reduced the coal’s oxi‑dation characteristics, indicating that higher pre-oxidation temperatures weakened the oxidation properties of the coal under high axial pressure.

国家自然科学基金资助项目(52074108,52274189,52174171);河南省高校创新人才项目(22HASTIT012);河南省高等学校重点科研项目(22A620001)

徐永亮,吴晋东,李敏杰,等.不同预氧化温度破碎煤在轴压下的自燃特性[J].河南理工大学学报(自然科学版),2025,44(1):10‑17.

XU Y L, WU J D, LI M J, et al. Spontaneous combustion behavior of crushed coal at different preoxidation tempera‑tures under uniaxial compression[J]. Journal of Henan Polytechnic University (Natural Science),2025,44(1):10-17.