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粉尘爆炸极限表

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粉尘爆炸极限包括爆炸下限和爆炸上限。粉尘爆炸下限是指在空气中,遇火源能发生爆炸的粉尘最低浓度。一般用单位体积内所含粉尘质量表示,其单位为g/m3。爆炸下限越低,粉尘爆炸危险性越大。不同种类粉尘其爆炸下限不同,同种物质粉尘其爆炸下限也随条件变化而改变。

空气中粉尘爆炸极限表

粉尘种类粉尘爆炸下极限g/m3起火点 ℃
金属35645
420416
500680
40常温
160775
45460
120316
220500
硅铁合金425860
20520
镁铝合金50535
210450
热固性塑料绝缘胶木30460
环氧树脂20540
酚甲酰胺25500
酚糠醛25520
热塑性塑料缩乙醛35440
醇酸155500
乙基纤维素20340
合成橡胶30320
醋酸纤维素35420
四氟乙烯-670
尼龙30500
丙酸纤维素25460
聚丙烯酰胺40410
聚丙烯腈25500
聚乙烯20410
聚对苯二甲酸乙酯40500
聚氯乙烯-660
聚醋酸乙烯酯40550
聚苯乙烯20490
聚丙烯20420
聚乙烯醇35520
甲基纤维素30360
木质素65510
松香55440
塑料一次原料己二酸35550
酪蛋白45520
对苯二酸50680
多聚甲醛40410
对羧基苯甲醛20380
塑料填充剂软木35470
纤维素絮凝物55420
棉花絮凝物50470
木屑40430
农产品及其它玉米及淀粉45470
大豆40560
小麦60470
花生壳85570
砂糖19410
煤炭(沥青)35610
肥皂45430
干浆纸60480

(1)粉尘粒径越小,爆炸下限越低。

(2)氧浓度越高,爆炸下限越低。

(3)可燃挥发性成分含量越高,粉尘爆炸下限越低。


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