【作者】 蔡涛；

【导师】 喻健良；

【作者基本信息】 大连理工大学 ， 安全技术及工程， 2006， 硕士

【摘要】 研究预混气体燃烧火焰在管道中的传播及管道内衬有可抑制燃烧爆炸材料对传播火焰的抑制作用，对工业阻火器的设计与应用，以及管道或开敞空间中可燃气体的防燃抑爆等，均具有重要的意义。本课题以内壁衬有多孔、可压缩材料硅酸铝板管道内燃烧火焰和压力波的变化作为研究对象，旨在为可燃气体燃烧爆炸的防治以及阻火器的设计应用提供依据。本文主要工作和结论如下： (1)建立了抑制燃烧爆炸的实验系统。该系统配以高频数据采集系统，可以实时检测压力、火焰速度等参数。抑制爆炸的结构为硅酸铝板。 (2)进行了乙炔／空气混合气和丙烷／空气混合气爆燃波在管内传播与抑制的实验研究。实验条件如下：乙炔浓度为化学计量比(7.75％)，丙烷浓度为化学计量比(3.95％)，爆炸初压为常压，管道内径为81mm，长度为2.2m，点火端密闭，出口端开放，实验研究了硅酸铝板结构对管内传播的爆燃火焰的抑制能力。 (3)实验研究了多孔可压缩吸收材料硅酸铝板的长度变化对管内火焰传播速度和超压抑制作用的影响。得到了火焰传播速度、超压与硅酸铝板长度之间关系的经验公式。随着硅酸铝板长度的增加，火焰的传播速度和超压都不断减小。 (4)实验研究了硅酸铝板厚度对火焰速度和超压的影响。长度值较小时，随厚度增加，火焰传播速度和超压出现先降低后增加的现象，即存在最佳抑制厚度；当长度超过一定值后，火焰速度和超压都随厚度增加而减小。得到了实验条件下的经验公式。 (5)将燃烧火焰和超压有机的结合在一起，提出了爆炸能的重要概念，用来表示燃烧气体爆炸过程中的能量。同时将硅酸铝板的长度和厚度综合起来用体积来评价其抑爆性能。体积越大，爆炸能越小，抑爆性能越好。更多还原

【Abstract】 The experimental investigations into premixed flame propagation in pipes or channels are great important for design and application of flame anesters, and deflagration suppression of flammable gas clouds in vessels or unconfined space. Aiming to provide theoretical references for deflagration suppression and the design of flame arresters, experimental investigations are carried out to analyze the flame and pressure wave propagation in tube lining with porous materials of aluminium silicate board on the tube wall in this paper. The main work and conclusions in this paper are as follow:(1) In experimental investigation, experimental apparatus that can measure pressure, and flame speed instantaneously are built, and high frequency data acquisition system is set up. The construction of explosion suppression is aluminium silicate board.(2) With premixed acetylene-air gases and propane-air gases, experimental investigations about explosion waves propagating and suppression in tube are dealt with. Experimental conditions are set as follow: Stoichiometric rate and atmospheric pressure are used for initial concentration of acetylene (7.75%), propane (3.95%) and initial pressure; the inside dameter and length of tube, which is closed at ignition end and open at the other, are 81 mm and 2.2 m respectively; The experimental investigations are carried out to analyze the suppression effect of aluminium silicate board on flame propagation in tubes.(3) The effects of construction of the length changes of aluminium silicate board on flame propagation speed and explosion overpressure in tube are analyzed. Empirical formulas about relationship between flame propagation speed, overpressure and the length of aluminium silicate board are obtained. With the increase of length, flame propagation speed and overpressure decrease.(4) In addition, the effects of the thickness of aluminium silicate board on flame propagation speed and overpressure are also analyzed. When the length value is set small, the phenomenon that the value of flame propagation speed and overpressure are first restrained to reduce and then increase as thickness increases, and best suppressive thickness is existed; With the increase of length and thicness, flame更多还原