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采用MIE-D1.2型最小点火能测试装置及20 L球型粉尘爆炸测试装置,对苯乙烯丙烯酸共聚物/碳黑混合体系粉尘的爆炸特性进行研究。结果表明,过74μm、58μm、47μm孔径筛的粉尘对静电火花敏感,其最小点火能表征值分别为610 mJ、361 mJ、201 mJ。随粉尘质量浓度增加,最小点火能呈现先减小后增加的规律。随粉尘粒径减小,最小点火能与粉尘质量浓度变化关系曲线向低粉尘质量浓度和低点火能量方向偏移,且对应的最敏感爆炸质量浓度从500 g/m~3降至200 g/m~3。随粉尘质量浓度增加,过147μm、74μm、47μm孔径筛的苯乙烯丙烯酸共聚物/碳黑混合体系粉尘爆炸压力及爆炸压力上升速率呈现先增加后减小趋势。在相同粉尘质量浓度下,中位径小于74μm的苯乙烯丙烯酸共聚物/碳黑混合体系粉尘,粉尘的爆炸压力增幅明显减小。苯乙烯丙烯酸共聚物/碳黑混合体系粉尘爆炸下限质量浓度为25 g/m~3,最大爆炸指数为14.636 MPa·m/s,爆炸危险等级划分为St1。
The explosion characteristics of the styrene acrylic copolymer / carbon black mixed system dust were studied by using the MIE-D1.2 minimum ignition energy test device and the 20 L ball dust explosion test device. The results show that the dust of 74μm, 58μm and 47μm aperture sieves is sensitive to electrostatic sparks, and their minimum ignition energy values are 610 mJ, 361 mJ and 201 mJ, respectively. With the increase of dust mass concentration, the minimum ignition energy presents the law of decreasing and then increasing. With the decrease of dust particle size, the curve of minimum ignition energy and dust mass concentration changes to low dust concentration and low ignition energy, and the corresponding most sensitive explosion mass concentration drops from 500 g / m 3 to 200 g / m ~ 3. With the increase of dust mass concentration, the dust explosion pressure and explosive pressure rise rate of styrene acrylic copolymer / carbon black mixed system with 147μm, 74μm, 47μm pore size sieves increased first and then decreased. Under the same dust concentration, the explosion pressure of styrene acrylic copolymer / carbon black mixed system with the median diameter less than 74μm increased obviously. The lower limit mass concentration of styrene-acrylic acid copolymer / carbon black hybrid system was 25 g / m 3, the maximum explosion index was 14.636 MPa · m / s, and the explosion hazard level was classified as St1.