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Experimental investigation of the inerting effect of crystalline II type Ammonium Polyphosphate on explosion characteristics of micron-size Acrylates Copolymer dust
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2017-10-31 , DOI: 10.1016/j.jhazmat.2017.10.060
Yuan Yu , Yunhao Li , Qingwu Zhang , Weishun Ni , Juncheng Jiang

The inerting effect of crystalline II type Ammonium Polyphosphate (APP-II) on explosion characteristics of micron-size Acrylates Copolymer (ACR) powders was experimentally studied. The inerting mechanism was analysed by combining thermogravimetry (TG) and differential scanning calorimetry (DSC) tests. The results indicated that the maximum explosion pressure (Pmax) and explosion index (Kst) was 10.4 bar and 416 bar m/s, respectively for ACR powders. The minimum explosion concentration (MEC) of ACR powders ranged from 20 to 30 g/m3, and the experimental minimum ignition energy (MIE) of the ACR dust cloud was 10 mJ. Therefore, ACR dust was determined to be severely combustible dust. There existed a minimum inerting concentration (MIC), and the explosion of ACR powders can be inerted completely by 80 wt% APP-II. Furthermore, 30 and 40 wt% APP-II had a significant inerting effect on the MIE of ACR dust.According to TG and DSC tests, thermal stability of ACR would be augmented by the introduction of APP-II. The addition of APP-II triggered lower maximum mass loss rate (MMLR), higher temperature corresponding to mass loss of 90% (T0.1), chars yield, and endothermic peaks. Consequently, the ACR dust explosion was inerted by the chemical interaction of ACR/APP-II mixtures and endothermic decomposition of APP-II.

中文翻译:

结晶II型聚磷酸铵对微米级丙烯酸酯共聚物粉尘爆炸特性的惰化作用实验研究

实验研究了结晶型II型聚磷酸铵(APP-II)对微米级丙烯酸酯共聚物(ACR)粉末爆炸特性的惰性作用。通过热重法(TG)和差示扫描量热法(DSC)测试对惰化机理进行了分析。结果表明,ACR粉末的最大爆炸压力(P max)和爆炸指数(K st)分别为10.4 bar和416 bar m / s。ACR粉末的最低爆炸浓度(MEC)为20至30 g / m 3,而ACR尘云的实验最小点火能量(MIE)为10 mJ。因此,ACR粉尘被确定为严重可燃粉尘。存在最小惰性浓度(MIC),并且80重量%的APP-II可以完全惰性化ACR粉末的爆炸。此外,30wt%和40wt%的APP-II对ACR粉尘的MIE有明显的惰化作用。根据TG和DSC测试,通过引入APP-II可以提高ACR的热稳定性。APP-II的添加引发了较低的最大质量损失率(MMLR),较高的温度,对应于90%(T 0.1)的质量损失,焦炭收率和吸热峰。因此,ACR的粉尘爆炸是由于化学相互作用而产生的。 ACR / APP-II混合物的合成和APP-II的吸热分解。
更新日期:2017-11-01
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