摘要：粉尘的最小点火能是决定能否发生粉尘爆炸及粉尘爆炸发生的难易程度的一个重要参数。为了评价铝粉的燃烧爆炸特性，本文对铝粉的最小点火能进行了实验。利用哈特曼管研究粉尘浓度、粒径和抑爆剂碳酸钙所占比例变化对铝粉最小点火能的影响。实验采用平均粒径分别为13、25、75、106、150m（1000、500、200、150、100目）的铝粉及平均粒径为38m（400目）的碳酸钙粉末进行研究。结果表明：78779

（1）研究粉尘浓度对最小点火能的影响。对于同一粒径的铝粉，随着质量浓度从200增大至1600，其最小点火能先减小后增大，且存在一个粉尘敏感浓度，在此浓度下粉尘的点火能量最小。实验测得25、75、150m（500、200、100目）铝粉的敏感浓度在800~1200之间，对应的最小点火能分别为：53。4、91。7、579。3mJ。

（2）研究粉尘粒径对最小点火能的影响。在同一浓度下，对于不同粒径大小的铝粉，随着其粒径的增大，最小点火能也随之增大。在浓度为400条件下，实验测得13、25、75、106、150m（1000、500、200、150、100目）的铝粉，最小点火能分别为：53。4、230。4、337。8、779。4、1000 mJ。

（3）研究加入不同比例碳酸钙粉末对最小点火能的影响。碳酸钙对金属粉尘有惰化抑爆效果，添加碳酸钙会增大铝粉的最小点火能；而且碳酸钙浓度越高、所占比例越大，混合粉尘的最小点火能越大，铝粉越难被点燃。并且在一定范围内二者近似成线性关系。实验测得当加入碳酸钙粉末比例为0、10%、30%、50%时 ，对应的最小点火能分别为：230。4、337。8mJ、779。4mJ、1000 mJ。

毕业论文关键词：铝粉、最小点火能、粉尘粒径、粉尘浓度

Study on Response of Dust Explosion Characteristic Parameters to Sensitive Factors

Abstract: The minimum ignition energy of dust is an important parameter in determining the degree of difficulty in dust explosion and dust explosion。 In order to evaluate the combustion and explosion characteristics of aluminum powder, the minimum ignition energy of aluminum powder was experimented。 The influence of dust concentration, particle size and the proportion of calcium carbonate on the minimum ignition energy of aluminum powder was studied by using Hartmann tube。 The aluminum powder with average particle size of 13,25,75,106,150μm (1000,500,200,150,100 mesh) and calcium carbonate powder with average particle size of 38μm (400 mesh) were studied。 The conclusions are as following:

(1) The effect of dust concentration on minimum ignition energy was studied。 For the same particle size of aluminum powder, with the mass concentration from 200 to 1600, the minimum ignition energy can be reduced first and then increased, and there is a dust sensitive concentration, at this concentration of dust The ignition energy is minimal。 The experimental results show that the sensitive concentration of aluminum powder is between 800 and 1200, and the minimum ignition energy is 53。4, 91。7 and 579。3 mJ, respectively。

(2) The effect of dust particle size on the minimum ignition energy was studied。 At the same concentration, for the different size of aluminum powder, with its particle size increases, the minimum ignition energy also increases。 At the concentration of 400, the minimum ignition energy of the aluminum powder of 13,25,75,106, 

150μm (1000,500,200,150,100 mesh) was 53。4,230。4,337。8 , 779。4, 1000 mJ。

(3)The effects of different proportions of calcium carbonate powder on the minimum ignition energy were investigated。 Calcium carbonate on the metal dust inhalation effect, adding calcium carbonate will increase the minimum ignition energy of aluminum powder; and the higher the concentration of calcium carbonate, the larger the proportion of the greater the maximum amount of dust mixed dust, aluminum powder Hard to be ignited。 And in a certain range the two approximate linear relationship。 The results show that the minimum ignition energy is 230。4, 337。8 mJ, 779。4 mJ and 1000 mJ when the proportion of calcium carbonate powder is 0, 10%, 30% and 50%。