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为探究可燃气体的添加对塑料粉尘/空气混合物爆炸特性的影响,以聚甲基丙烯酸甲酯(PMMA)和热塑性聚氨酯弹性体(TPU)2种塑料粉尘为研究对象,在对其进行热重分析(TG)的基础上,利用20 L球形爆炸试验装置,研究甲烷体积分数对这2种塑料粉尘/空气混合物爆炸压力、爆炸压力上升速率、爆炸下限等特征参数的影响。热重试验结果表明:PMMA粉体分解速率高,在外界供热条件下易发生燃烧,而TPU粉体分解所需能量更多,分解更加困难。爆炸试验结果表明:在试验选定的粉尘浓度条件下,2种粉尘爆炸压力及压力上升速率均随粉尘浓度呈现先升高后降低的变化趋势;当甲烷体积分数从0增加到4%时,塑料粉尘爆炸的猛度和敏感度随之增加,其中PMMA粉尘爆炸猛度受甲烷影响更大,而TPU粉尘基本不受影响,但其爆炸下限下降更明显。
In order to investigate the effect of combustible gas addition on the explosive properties of plastic dust / air mixture, two kinds of plastic dusts, polymethylmethacrylate (PMMA) and thermoplastic polyurethane elastomer (TPU), were investigated. Thermal gravimetric analysis (TG), the influence of methane volume fraction on the characteristic parameters of explosion pressure, explosion pressure rise rate and lower explosion limit of these two kinds of plastic dust / air mixtures was studied by using 20 L spherical explosion test equipment. Thermal gravimetric test results show that the decomposition rate of PMMA powder is high, it is easy to burn under external heating conditions, and the energy required for decomposition of TPU powder is more and the decomposition is more difficult. The results of blasting test showed that both the dust explosion pressure and the rate of pressure rise increased first and then decreased with the dust concentration at the selected dust concentration. When the methane volume fraction increased from 0 to 4% The intensity and sensitivity of plastic dust explosion increased accordingly. Among them, the blast of PMMA dust was more affected by methane and the TPU dust was not affected basically, but the explosion lower limit was more obvious.