纵向通风风速对锯末正向阴燃过程的影响

The influence of longitudinal ventilation velocity on the forwards moldering process of sawdust

为探讨通风条件对阴燃过程的影响,笔者利用小型阴燃试验炉,研究了纵向通风风速对落叶松锯末正向阴燃过程中的阴燃建立时间、阴燃速度、阴燃温度和质量损失的影响。结果表明,在不同的通风风速下,阴燃的建立时间差别不大,但总平均阴燃速度随着通风风速的增加而明显增大;沿阴燃传播方向,不同位置处的平均阴燃速度均呈现先增大后减小的趋势,阴燃温度均依次出现先升高后下降的变化趋势;当通风风速v=0 m/s时,阴燃最高温度达451.9℃;锯末阴燃质量损失速率和最终剩余质量均随通风风速的增加而增大。研究结果可以为阴燃火灾事故预防提供一定参考。

In order to explore the influence of ventilation conditions on smoldering process,the influence of longitudinal ventilation velocity on the smoldering establishment time,smoldering speed,smoldering temperature and quality loss in forward smoldering process of Larch sawdust were studied in the paper by using a small smoldering test furnace.The results show that under different ventilation wind velocity,the establishment time of smoldering does not display any apparent difference,but the total average smoldering speed increases obviously with the increase of ventilation wind velocity;along the smoldering propagation direction,the average smoldering speed at different positions presents the trend of first increasing and then decreasing,and the smoldering temperature presents the trend of first increasing and then decreasing;when the ventilation velocity is zero,the smoldering temperature reaches the maximum of 451.9 oC.Moreover,the mass loss rate and the final residual mass of sawdust increase with the increase of ventilation velocity.The results can provide some reference for the prevention of smoldering fire.