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摘要: 以2m 铝粉为介质,在内径68mm、高305mm 的钢制圆柱容器顶端连接内径25mm、不同长度 的钢制泄爆管,开展了粉尘爆炸泄放实验。通过分别改变泄爆管长度及粉尘的质量浓度,研究粉尘爆炸泄放 过程中容器及泄爆管内的压力特性,重点在探索泄放过程中二次爆炸发生的条件。结果表明,在本实验条件 下,当泄爆管长度LT1500mm,粉尘质量浓度500g/m3 时,泄爆管内发生二次爆炸的几率很高。二次 爆炸产生的压力波分别向爆炸容器及泄爆管末端2个方向传播。向爆炸容器传播的压力波阻碍并扰乱泄放 过程,导致容器内残余未燃粉尘反应,使容器内压力出现二次峰值。Abstract: Thealuminumpowderof2mparticlesizewastakenasthemediumandaseriesofdustexplosionreliefexperimentswerecarriedoutbylinkingthesteel eliefpipeswith25mminternaldiametertothetopofthecylindricalsteelvesselwith68mminternaldiameterand305mmheight. The steelreliefpipelengthandthedustmassconcentrationwereadjusted,respectively,toinvestigatethe pressurecharacteristicsinthevesselandthereliefpipeandtoexploreprincipallythesecondaryexplosion- inducedconditionintheexplosionreliefprocess.Experimentalresultsdemonstratethatsecondaryexplosionmayoccurwhenthereliefpipelengthanddustmassconcentrationarenolessthan1500 mmand500g/m3,respectively.Thepressurewavesinducedbysecondaryexplosionpropagatetowardboththevesselandthereliefpipeend. Thepressurewavespropagatingtowardthevesseldisturbthereliefprocessandinducetheresidualunburntcombustible mixtureinthevesselreact. Hence,secondarypressurepeakappearsinthevessel.
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