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阴燃是一种自维持、不断传播的、异相反应的放热燃烧过程。典型的阴燃例子有香烟、地下煤矿的燃烧等。从热安全角度来看阴燃过程 ,不完全的氧化反应和可燃物热解都会产生很多的有毒气体 ,对人造成危害 ;另外在一定的条件下 ,阴燃还会突然转化为有焰火 ,进行更猛烈的燃烧 ,造成更大的破坏。有焰火的出现实际上就是热解析出的可燃气在边界层中被点燃。影响其点燃有三个方面的因素 ,一、边界层中可燃气的浓度 ;二、边界层中氧的浓度 ;三、边界层中传热实现点火能供给。在发生热解和化学反应过程的情况下 ,本文导出了能够出现有焰火的数学表达式。本文所得的结论与 Ohlemiller[1] 、Law,C.K[2 ] 、孙文策等[3] 的实验相一致。
Smoldering is a self-sustaining, constantly spreading, heterogeneous reaction to the exothermic combustion process. Typical smoldering examples include cigarettes, burning underground coal mines and the like. From the perspective of thermal safety smoldering process, incomplete oxidation and pyrolysis of combustibles will produce a lot of toxic gases, causing harm to people; In addition, under certain conditions, smoldering but also suddenly transformed into a fireworks, carried out More violent burning, resulting in greater damage. The existence of a fireworks is actually pyrolytic gas that is ignited in the boundary layer. There are three factors that affect its ignition. First, the concentration of combustible gas in the boundary layer. Second, the concentration of oxygen in the boundary layer. Third, heat can be supplied in the boundary layer for ignition. In the case of pyrolysis and chemical reactions, this paper derives a mathematical expression in which a fireworks can occur. The conclusions obtained in this paper are consistent with the experiments of Ohlemiller [1], Law, C.K [2], Sun Wen-Ce et al. [3].