不同预氧化温度破碎煤在轴压下的自燃特性
Spontaneous combustion behavior of crushed coal at different preoxidation temperatures under uniaxial compression
徐永亮 1吴晋东 2李敏杰 2张健 3王文4
作者信息
- 1. 常州大学 安全科学与工程学院,江苏 常州 213164;河南理工大学 安全科学与工程学院,河南 焦作 454000;煤炭安全生产与清洁高效利用省部共建协同创新中心,河南 焦作 454000
- 2. 河南理工大学 安全科学与工程学院,河南 焦作 454000
- 3. 河南理工大学 安全科学与工程学院,河南 焦作 454000;煤炭安全生产与清洁高效利用省部共建协同创新中心,河南 焦作 454000
- 4. 河南理工大学 能源科学与工程学院,河南 焦作 454000
- 折叠
摘要
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 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0,4 MPa时,预氧化温度70℃煤样的氧化特性最强,轴压为8 MPa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 (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.
Abstract
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 C2H4 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.
关键词
轴压/耗氧速率/特征温度点/指标气体/表观活化能/自燃倾向性Key words
uniaxial compression/oxygen consumption rate/characteristic temperature point/index gases/apparent activation energy/propensity for spontaneous combustion引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据