煤火竖直方向阴燃特性分析
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摘要
为探究煤火竖直方向阴燃传播特性,构建了煤阴燃模拟相似实验平台,在不同供风速率下开展了长焰煤竖直方向阴燃模拟实验,研究结果表明,在竖直正向阴燃过程中,在2、0.8 m~3/h供风量条件下,阴燃过程中顶部煤体向底部垮落,而在0.4、0.2 m~3/h及以下供风量,未形成明显垮落。在竖直反向阴燃过程中,除了T_4点温度超过了240℃,其他3个点温度依旧是室温。从脱挥发分阶段可以观察到存在规律性的阴燃前锋的传播过程,表明阴燃的反应是从T_4到T_1依次传播的。
To investigate the smoldering propagation characteristics of coal fire in vertical direction,a similar experimental platform for coal smoldering simulation was constructed. The vertical smoldering simulation experiment of long flame coal was carried out under different air supply rates. In the smoldering process,the top coal body collapsed to the bottom under the condition of air supply of 2,0.8 m~3/h during the smoldering process,while the air supply volume of 0.4, 0.2 m~3/h and below did not form obvious slump. In the vertical reverse smoldering process,except that the temperature at T_4 exceeds 240 ℃,the temperature at the other three points is still room temperature. From the devolatilization stage, it can be observed that there is a regular smoldering front propagation process,indicating that the smoldering reaction is transmitted from T_4 to T_1 in turn.
To investigate the smoldering propagation characteristics of coal fire in vertical direction,a similar experimental platform for coal smoldering simulation was constructed. The vertical smoldering simulation experiment of long flame coal was carried out under different air supply rates. In the smoldering process,the top coal body collapsed to the bottom under the condition of air supply of 2,0.8 m~3/h during the smoldering process,while the air supply volume of 0.4, 0.2 m~3/h and below did not form obvious slump. In the vertical reverse smoldering process,except that the temperature at T_4 exceeds 240 ℃,the temperature at the other three points is still room temperature. From the devolatilization stage, it can be observed that there is a regular smoldering front propagation process,indicating that the smoldering reaction is transmitted from T_4 to T_1 in turn.
引文
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[3]田丽,杨晓丹.阴燃过程及其传播机理的分析与研究[J].火灾科学,2000(4):51-57.
[4]林龙沅,周建军,肖渊,等.自然对流条件下垂直向上阴燃向有焰火转化的研究[J].消防科学与技术,2007(3):229-232.
[5]王文才,王瑞智,张朋,等.巷道中煤层阴燃状态的判定[J].煤炭科学技术,2011,39(5):54-57.
[6]林龙沅,周建军,路长,等.聚氨酯泡沫材料阴燃发展过程的特性分析[J].火灾科学,2007(1):43-47,67.