基于大型试验仓的煤自燃特性研究  

Study on coal spontaneous combustion characteristics based on large test bin

作　　者：朱育超 ZHU Yuchao(Shaanxi Province Gas Governance Supervision Group,Xi’an 710018,China)

机构地区：[1]陕西省瓦斯治理督导组,陕西西安710018

出　　处：《陕西煤炭》2021年第6期22-26,54,共6页Shaanxi Coal

摘　　要：煤自燃问题如果得不到有效解决,将严重威胁煤炭的利用并导致环境问题。为了解煤的自燃机理,预测煤的自燃,在大型试验仓进行了试验和数值模拟研究。通过试验得到了试验仓内气体浓度和温度变化规律,在数值模型中模拟了氧气演化过程,求解了Arrhenius方程和化学物质在多孔介质中的迁移方程,利用动力学结果模拟了煤氧化过程中的自发加热特性。模拟结果与试验结果具有较好的一致性;在30天前,氧气与温度分布及其数值变化较小,30天之后变化较大;由于煤氧化反应加剧,高温区域向氧气含量较高的进风口移动。该研究有助于认识煤炭自燃现象,控制煤炭自燃灾害。If the problem of coal spontaneous combustion is not effectively solved,it will seriously threaten the utilization of coal and lead to environmental problem.In order to understand the mechanism of coal spontaneous combustion and predict the coal spontaneous combustion,the experiment in large test bin and numerical simulation were carried out.The variation laws of gas concentration and temperature in the test bin are obtained through experiments.The evolution process of coal oxidation is simulated by the numerical model,the Arrhenius equation and the migration equation of chemical substances in porous media are solved,and the temperature rise characteristics in the process of coal oxidation are simulated by using the kinetic results.The simulation results are in good agreement with the experimental results.The oxygen and temperature distribution and their values changed little before 30 days,and changed greatly after 30 days.Due to the intensification of coal oxidation reaction,the high-temperature area moves to the air inlet with high oxygen content.This study is helpful to understand the phenomenon of coal spontaneous combustion and control the disaster of coal spontaneous combustion.

关 键 词：煤自燃 大型试验仓 数值模拟 煤体温度 

分 类 号：TD752[矿业工程—矿井通风与安全] TQ531.6[化学工程—煤化学工程]