神优二号煤自然发火期及标志性气体试验研究

Study on the spontaneous combustion period and symbolic gases of Shenyou No.2 coal

考察了神优二号煤种自然发火期、煤自然发火标志性气体及预警临界值,以便更好地为储煤球仓束管监测自燃火灾预报和防治工作提供理论依据,对神优二号煤种的煤自然发火过程进行模拟,并采用程序升温的试验方法,测试煤自燃各温度段产生的标志性气体的种类、体积分数及其与温度变化对应的关系。结果表明,神优二号煤种的自然发火期为28 d,CO可以作为神优二号煤种的自然发火主要标志性气体,CO体积分数增加速率和C_(2)H_(4)、C_(2)H_(6)体积比可以作为辅助性指标对煤自燃所处阶段进行判断预警。

The spontaneous combustion period,symbolic gases of coal spontaneous ignition and warning critical values of Shenyou No.2 coal are investigated in order to provide theoretical basis for monitoring,predicting,and preventing spontaneous combustion fires in the bundle tube of the spherical warehouse for storing coal.The spontaneous combustion process of Shenyou No.2 coal is simulated,and TPD is used to test the types,concentrations,and corresponding relationships with temperature changes of the symbolic gases generated in each temperature range of coal spontaneous combustion.The results show that the spontaneous combustion period of Shenyou No.2 coal is 28 d,and CO can be the main symbolic gas.The rate of increase in CO volume fraction and the volume ratio of C_(2)H_(4)and C_(2)H_(6)can be used as auxiliary indicators to judge and warn the period of coal spontaneous ignition.