卧式滚筒内二元颗粒喷雾的数值模拟与分析
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摘要
以离散元法为基础,以提高造粒效率为目标,对卧式滚筒内喷雾参数进行数值模拟仿真。通过理论推导喷嘴高度,并对喷嘴高度、喷雾流量进行模拟,以颗粒的质量增加量和受到喷雾的颗粒的喷雾效果进行评估,得出不同质量的二元颗粒在卧式滚筒内喷雾参数值。模拟验证了喷雾高度理论推导正确,喷嘴到滚筒底部高度h,颗粒质量从100 kg到300 kg,喷雾合格率为84%左右时,喷雾流量增加,生产率提高。
In view of the spray uniformity of the binary particles in the horizontal roller,this paper proposed to carry out numerical simulation on the spray parameters on the basis of discrete element method to improve granulation efficiency. First,the paper selected nozzle height through theoretical deduction and simulated the nozzle height and spray flow; secondly,the paper evaluated the spray effect by the amount of mass increase and the particles that were sprayed. Therefore,we found the solution to choosing the spray parameters of different mass. The simulation verified the theoretical derivation of spray height. We find that the spray is best when the nozzle height to the bottom of the roller is h. When the qualified rate of spray is about 84% and the particle mass is from 100 kg to 300 kg,the spray flow rate increases by half and the productivity increases by half.
In view of the spray uniformity of the binary particles in the horizontal roller,this paper proposed to carry out numerical simulation on the spray parameters on the basis of discrete element method to improve granulation efficiency. First,the paper selected nozzle height through theoretical deduction and simulated the nozzle height and spray flow; secondly,the paper evaluated the spray effect by the amount of mass increase and the particles that were sprayed. Therefore,we found the solution to choosing the spray parameters of different mass. The simulation verified the theoretical derivation of spray height. We find that the spray is best when the nozzle height to the bottom of the roller is h. When the qualified rate of spray is about 84% and the particle mass is from 100 kg to 300 kg,the spray flow rate increases by half and the productivity increases by half.
引文
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[12]王鹏程,范元钢,王彩玲,等.滚筒混合抄板长度和角度的二维数值模拟仿真[J].兵器装备工程学报,2018,39(4):170-173.
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[2] BASZCZYK M,HEIM A,OLEJNIK T P. The effect of wetting on the course of the drum granulation[J]. Chemical&Process Engineering,2017,38(2):331-342.
[3]毕菲菲.液滴撞击弯曲壁面的动力学过程研究[D].大连:大连理工大学,2015.
[4]高红利,陈友川,赵永志,等.薄滚筒内二元湿颗粒体系混合行为的离散单元模拟研究[J].物理学报,2011,60(12):1-7.
[5]蔡葵.喷雾流化床中含液滴作用的气固流动和造粒过程研究[D].南京:东南大学,2017.
[6] BIN L I,JI L. Numerical simulation of particle mixing in circulatiug fluidized bed with discrete element method[J].Proceedings of the Case,2012,32(20):42-48.
[7] POTYONDY D O,CUNDALL P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics&Mining Sciences,2004,(41):1329-1364.
[8] IWASHITA K,ODA M. Rolling resistance at contacts in simulation of shear band development by DEM[J]. Journal of Engineering Mechanics,1998,124(3),285-292.
[9]焦杨,章新喜,孔凡成,等.湿颗粒聚团碰撞解聚过程的离散元法模拟[J].物理学报,2015,64(15):1-9.
[10] HUANG X,HANLEY K J,O’SULLIVAN C,et al. Exploring the influence of interparticle friction on critical state behaviour using DEM[J]. International Journal for Numerical&Analytical Methods in Geomechanics,2015,38(12):1276-1297.
[11]张锐.基于离散元细观分析的土壤动态行为研究[D].长春:吉林大学. 2005.
[12]王鹏程,范元钢,王彩玲,等.滚筒混合抄板长度和角度的二维数值模拟仿真[J].兵器装备工程学报,2018,39(4):170-173.
[13]陈彬.颗粒混合喷雾造粒的数值模拟分析[D].南京:南京理工大学,2016.
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