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以石家庄某制药企业生产的7-氨基头孢烷酸(简称7-ACA)粉体为研究对象,利用20 L球型爆炸系统研究氮气抑制粉尘爆炸的规律。通过设计的混气系统向爆炸容器内充入氮气以降低容器内的氧气体积分数,创造不同氮气体积分数环境来进行一系列粉尘爆炸试验。结果表明,在化学点火能量为10 k J、7-ACA粉尘质量浓度为775g/m3时,爆炸压力达到最大值。在该粉尘质量浓度条件下,随氮气充入量增加,其最大爆炸压力逐渐降低;当氧气体积分数达10.93%时,测试系统显示7-ACA粉尘不发生爆炸;继续充入氮气,也没有发生爆炸现象,表明抑爆效果明显。
A 7-Aminocephalosporanic acid (abbreviated as 7-ACA) powder produced by a pharmaceutical company in Shijiazhuang was used as a research object. The 20 L ball explosion system was used to study the law of nitrogen dust suppression. A series of dust explosion tests were carried out by designing a mixed air system to fill the explosion container with nitrogen to reduce the oxygen volume fraction in the container and create different nitrogen volume fraction environments. The results show that the explosion pressure reaches its maximum at a chemical ignition energy of 10 kJ and a 7-ACA dust mass concentration of 775 g / m3. Under the conditions of the mass concentration of dust, the maximum explosion pressure gradually decreased with the increase of nitrogen charge. When the oxygen volume fraction reached 10.93%, the test system showed that the 7-ACA dust did not explode. Explosion phenomenon, indicating that explosion suppression effect is obvious.