The Problems of Porous Flame-Arresters
The Problems of Porous Flame-Arresters
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DOI：
10.1007/978-94-011-4712-5_15
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发表时间：
1999
期刊：
影响因子：
6.1
通讯作者：
V. S. Babkin
中科院分区：
文献类型：
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作者：
V. S. Babkin
众所周知，多孔阻火器是基于临界直径的概念。当需要防止爆燃或爆炸的意外传播时，它们可用于可燃气体的管道中。尽管设备表面上很简单，但有时由于操作条件不符合设计的技术要求，它们的功能有时会出现故障。这是对狭窄通道和多孔介质中火焰传播和淬火的实际过程进行一定程度简化的结果。通常，在设计阻火器时，不会考虑一些复杂的因素，如质量力作用、气流特性（速度、湍流、多相）、气流与多孔介质的力相互作用、多孔介质表面的化学特性等。层流燃烧速度是可燃气体反应性的唯一使用的特征。但它并不总是充分代表各种类型火焰的行为，例如冷火焰、链火焰和热火焰。通常不考虑燃烧波进入阻火器的多孔床以及在这种非稳态和稳态燃烧状态的情况下出现的边界条件。这些因素可能会导致多孔阻火器工作失败并可能导致灾难。
It is known that the porous flame-arresters are based on the concept of critical diameter. They are used in the pipe lines with combustible gases when it is necessary to prevent accidental propagation of deflagration or detonation. In spite of apparent simplicity of the devices there are sometimes failure in their function due to as a rule inadequacy of operating conditions to technical requirement of the design. It is the consequence of some simplification of real processes of flame propagation and quenching in narrow channels and porous media. As a rule when designing the flame-arresters there are not taken into account some complicated factors like mass force action, gas flow properties (velocity, turbulence, multiphase), force interaction of the flow with a porous medium, chemical properties of the porous medium surface, and etc. Laminar burning velocity is the only used characteristic of reactivity of combustible gas. But it does not always adequacy represent the behaviour of various types of flames, e.g., cool, chain and thermal. It is usually not taken into account the boundary conditions of entering of combustion wave into porous bed of the flame-arrester and arising in this case of non-stationary and steady-state combustion regimes. These factors may cause failure in operation of porous flame-arresters and may lead to disaster.