-200目硫磺粉收集过程中的荷电特性及静电消除

发布时间：2018-03-31 14:41

  本文选题：硫磺粉　切入点：荷电特性　出处：《西南科技大学》2017年硕士论文

【摘要】：近年来,随着粉体行业的蓬勃发展,粉状硫磺日益凸显出潜在的优势。然而,在硫磺粉碎过程中,由静电积聚引起的粉尘爆炸问题一直是亟待解决的行业难题。本文以LNI-330A型分级式冲击磨制备-200目硫磺粉的生产线为研究背景,对硫磺粉干式粉碎中的荷电特性及静电消除进行了研究。首先,采用MM440型restch球磨仪对-200目硫磺粉进行研磨,测试了硫磺粉的荷电特性,结果表明:硫磺粉荷质比随着研磨速度的增大而增大,最终会趋于稳定达到饱和,-200目硫磺粉饱和静电量为-35 nC/g;硫磺粉饱和静电量也受研磨材质的影响,采用氧化锆、碳化钨和不锈钢的材质进行研磨,得出硫磺粉饱和静电的大小关系:氧化锆Q不锈钢Q碳化钨。然后,采用BT-1000型粉体综合特性测试仪对硫磺粉流动性进行了测试,结果发现-200目硫磺粉具有较差的流动性,然后又对不同含水量和不同荷质比的硫磺粉进行了测试,发现当含水量高于1.5%,或者荷质比大于-6.6 nC/g时,流动性变得很差。其次,在自建气力输送与收集硫磺粉实验装置中,测试了直角弯头与旋风除尘器离心作用对硫磺粉荷电特性的影响,结果发现,当颗粒粒径不变时,直角弯头与旋风除尘器内荷质比均随气流速度的增大而增大,随质量流量的增大呈先增大后减小的趋势。硫磺粉荷质比随直角弯头弯径比的增大而减小,当气流速度小于16.07m/s时,R=2D的弯头与R=1.5D的弯头比较,硫磺粉的荷质比降低22%,继续增大气流速度,在满足工艺布局的条件下可以适当增大弯径比至2.5～3D之间。最后,采用LNI-330A型分级式冲击磨制备-200目硫磺粉,研究了空气比湿度与湿基含水量对硫磺粉荷质比的影响,结果表明硫磺粉荷质比随空气比湿度的增大而减小,通过空气相对湿度与空气比湿度、空气饱和含水量与温度之间的关系转化,得到温度、相对湿度与荷质比的关系:Q=A1-A2/1+λeαRH(a+ce-∫/b)+A2。提高湿基含水量同样能达到降低荷质比的目的,当硫磺粉湿基含水量从0增大到0.9%时,荷质比可降低61%。综合考虑硫磺粉湿基含水量与荷质比对流动性的影响,可以得到湿基含水量为0.2%～0.3%之间时,荷质比为-6.187～-5.389 nC/g,硫磺粉的分散性最优。
[Abstract]:In recent years, with the vigorous development of powder industry, powdered sulfur has increasingly highlighted the potential advantages. However, in the process of sulfur crushing, Dust explosion caused by electrostatic accumulation has always been a difficult problem to be solved. In this paper, the production line of -200 mesh sulfur powder prepared by LNI-330A type graded impact mill is used as the research background. The charge characteristics and electrostatic elimination of sulfur powder in dry pulverization were studied. Firstly, the charge characteristics of sulfur powder were tested by grinding -200 mesh sulfur powder with MM440 restch ball mill. The results show that the charge / mass ratio of sulfur powder increases with the increase of grinding speed, and finally tends to reach saturation to -200 mesh sulfur powder saturation electrostatic quantity of -35 nC / g, sulfur powder saturated electrostatic capacity is also affected by grinding material, using zirconia, The material of tungsten carbide and stainless steel was ground, and the relation of saturated static electricity of sulfur powder was obtained: zirconia Q stainless steel Q tungsten carbide. Then, the fluidity of sulfur powder was tested by BT-1000 powder comprehensive characteristic tester. The results showed that the sulfur powder of -200 mesh had poor fluidity, and then the sulfur powder with different water content and different ratio of charge to substance was tested. It was found that when the water content was higher than 1.5 and the ratio of charge to substance was greater than -6.6 nC/g, the fluidity of sulfur powder became very poor. The effect of centrifugal action of right angle elbow and cyclone dust collector on the charge characteristics of sulfur powder was tested in a self-built experimental device for pneumatic conveying and collecting sulfur powder. The results showed that the particle size was constant when the particle size was constant. The ratio of charge to mass in right angle elbow and cyclone precipitator increases with the increase of air velocity and decreases with the increase of mass flow rate. The charge to mass ratio of sulfur powder decreases with the increase of bending diameter ratio of right angle elbow. When the flow velocity is less than 16.07m/s, the charge / mass ratio of sulfur powder decreases by 22%, and the flow velocity continues to increase when the flow velocity is less than 16.07m/s. Finally, the ratio of bending to diameter can be appropriately increased to 2.5 脳 3 D when the flow velocity is less than 16.07m/s. Finally, The effect of specific humidity of air and moisture content of wet base on the charge / mass ratio of sulfur powder was studied. The results showed that the charge / mass ratio of sulfur powder decreased with the increase of specific humidity of air. By transforming the relationship between air relative humidity and air specific humidity, air saturated moisture content and temperature, the relationship between temperature, relative humidity and charge-mass ratio is obtained, and the relationship between temperature, relative humidity and charge-mass ratio: 1 位 A 1-A 2 / 1 位 e 伪 RH(a ce- 鈪，

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