摘要
在内径56mm、高1600mm的冷态流化床实验装置上研究了不同粒径电路板塑料颗粒的流化特性,获得了粒径和颗粒类型对塑料颗粒流化特性的影响规律.实验结果表明,电路板塑料颗粒为Geldart A类颗粒时,粘性力大,塌落特性明显,流化性能较差,具有拟C类颗粒的流化特性;电路板塑料颗粒为B类颗粒时,塌落特征不明显,并且随着粒径的增大,最小流化速度也增大.通过比较不同公式对最小流化速度的计算结果发现,B类颗粒用Ergun公式得到的结果比其他公式更接近实验结果,b,c和d颗粒的理论最小流化速度分别为实验结果的94.5%,114%和91.8%,A类颗粒用3种公式得到的结果与实验结果均相差很大,需要进一步考虑粘性颗粒的受力情况,建立力平衡模型。
The experiments were carried out in a fluidized bed of 56 mm in diameter and 1600 mm in height to determine the fluidization characteristics of four types of scrap printed circuit board particles with different average sizes. The results show that the fluidization characteristics of scrap printed circuit board particles depend on the average size and type of particles. The scrap printed circuit boards particles, belonging to Geldart A group with strong viscous force, whose fluidization was similar to fluidization of Geldart C, was difficult to fluidize. Whereas, the scrap printed circuit board particles belonging to Geldart B can be fluidized smoothly. Based on the experimental data and the analysis of acting forces, the minimum fluidization velocity is calculated by three correlations. It was found that the minimum fluidization velocities calculated by Ergun Equation approached 94.5%, 114% and 91.8% of the experimental minimum fluidization velocities for the b, c and d particles of Geldart B group. For the scrap printed circuit board particles belonging to Geldart A group, a model of force balance about cohesive particles should be developed to evaluate fluidization characteristics with cohesive particles.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第2期224-229,共6页
The Chinese Journal of Process Engineering
基金
山东省科技攻关重点研究基金资助项目(编号:2004GG2207015)
教育部科学技术重点基金资助项目(编号:105106)
关键词
电路板塑料颗粒
最小流化速度
粒径
粘性颗粒
模型
scrap printed circuit boards particles
minimum fluidization velocity
particle size
cohesive particles
model
