Simulation study on regulation mechanism of key quality attributes of twin⁃screw wet granulation

doi:10.19491/j.issn.1001-9278.2022.06.016

Abstract

Abstract:

Aiming at the common industrial problem in a difficulty to control the key qualities， including the uniformity of particle size distribution， the apparent quality of particle， and granulation yield for the granulation process in China， a simulation method of the continuous counter?rotating twin?screw high?shear wet granulation process was constructed on the basis of the Edinburgh Elastic?Plastic Adhesion contact model. The cooperative coupling evolution mechanism of process parameters. i.e.， ? particle size distribution uniformity and yield， was simulated， and the regulation mechanism of key qualities for twin?screw wet granulation was analyzed. The simulation results indicated that the continuous counter?rotating twin?screw high?shear wet granulator could prepare spheroidized particles with a smooth surface. The particle size was positively correlated with the feed speed of powder but negatively correlated with the screw speed. The granulation yield， powder feeding speed， and screw speed presented an evolution law that the yield increased at first and then decreased with an increase in powder feeding speed and screw speed. When the powder feeding speed was 360 kg/h or the screw speed was 1 400 r/min， the granulation yield exhibited an optimal status along with optimal granulation yields of 87.9 % and 83.91 %. The particle size was mainly controlled by the average residence time and holding up mass of particles， showing a positive correlation. A technical method for on?line real?time regulation was proposed. In this method， the size and yield of qualified particles were controlled by the frequency conversion speed control of the screw for the powder weight loss feeding device and continuous counter?rotating twin?screw high?shear wet granulator.

Key words: wet granulation, twin screw, key quality attributes, regulation mechanism, simulation

CLC Number:

TQ320.66⁺3

LIU Zheng, LIU Zhenfeng, ZHOU Guofa. Simulation study on regulation mechanism of key quality attributes of twin⁃screw wet granulation[J]. China Plastics, 2022, 36(6): 100-107.

Figures/Tables 20

Fig.1. Simplified model of the counter?rotating twin?screw granulator

密度/

kg•m ^-3

泊松比

剪切模量/

恢复

系数

静摩擦

因数

动摩擦

因数

2×10⁶

Tab.1. Powder physical parameters

黏附力强度/N

表面能/

J•m^-2

Tab.2. EEPA model parameters

Fig.2. Influence of powder feeding speed on the three?dimensional morphology and particle size distribution of granulation

Fig.3. Influence of screw speed on the three?dimensional morphology and particle size distribution of granulation

Fig.4. Influence of powder feeding speed and screw speed on particle size distribution

Fig.5. Correlation curve of granulation yield， powder feeding speed and screw speed

Fig.6. Granulation yield against time

Fig.7. Average equivalent particle size against powder feeding speed and screw speed

颗粒材料	黏附力强度/N	表面能/J•m^-2	接触塑性比	黏附分支指数	切向刚度系数
PE⁃HD‐PE⁃HD	-0.001	3.00	0.8	1.5	0.30
PE⁃HD‐碳酸钙	-0.001	2.00	0.5	1.5	0.25
碳酸钙‐碳酸钙	-0.001	0.25	0.2	1.5	0.80

Tab.3. EEPA model parameters of PE?HD and calcium carbonate powder

Fig.8. Three dimensional morphology of high density polyethylene filled calcium carbonate composite particles

Fig.9. Particle size distribution of high density polyethylene filled calcium carbonate composite particles

Fig.10. Influence of powder feeding speed on powder movement speed and powder bulk density

Fig.11. Holding up particle mass against powder feeding speed

Fig.12. Average residence time against powder feeding speed

Fig.13. Normal contact force of the wetting powder against feeding speed of the powder

Fig.14. Influence of screw speed on the movement characteristics of powder in KE block

Fig.15. Holding up particle mass against screw speed

Fig.16. Average residence time against screw speed

Fig.17. Normal contact force of the wetting powder against screw speed

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