Simulation and evaluation of granulation performance of D11 twin screw high shear wet granulator

doi:10.19491/j.issn.1001-9278.2024.08.017

Abstract

Abstract:

Based on the digital virtual prototype simulation method of collaborative integration of twin screw high shear wet granulation process and equipment， influence of the structural characteristics and screw scale on the granulation performance and key quality attributes were simulated and evaluated for D11 small twin screw high shear wet granulator， and the synergistic coupling evolution law was constructed among the key quality attributes of endpoint granulation， structural features， screw scale. The research results indicated that the D11 small twin screw high shear wet granulator in this article can achieve the manufacturing of particle with diameter size of 750~936 μm，which can achieve the maximum granulation yield with 88.84 %. Moreover， the relation between the diameter sizes d10， d50， d90， granulation yield and screw pitch pre compression ratio， screw scale exhibit synergistic evolution law of a positive correlation，while the relation between the consistency of granulation particle size and screw pitch pre compression ratio and screw scale exhibits the synergistic evolution law of a negative correlation. Increasing the pre compression ratio of the screw pitch to 3.67 can increase the maximum particle size to 936 μm， Particle size span reduced to 0.49. Increasing the pre compression ratio of screw pitch can improve the granulation performance and consistency of endpoint granulation for D11 small twin screw high shear wet granulator， which can compensate for the deterioration of granulation characteristics caused by the reduction of screw scale.

Key words: twin screw high shear wet granulator, granulation performance, screw scale, structure, simulation

CLC Number:

TQ320.66⁺3

HU An, MAO Yuanrui, ZHOU Guofa. Simulation and evaluation of granulation performance of D11 twin screw high shear wet granulator[J]. China Plastics, 2024, 38(8): 106-112.

Figures/Tables 20

Fig.1. Screw structure of the high shear wet granulator of D11 small twin screw

密度/

kg·m^-3

泊松比

剪切模量/Pa

恢复

系数

静摩擦

因数

滚动摩擦

因数

2×10⁶

Tab.1. Physical property of the mannitol powder

过程参数

名称

螺杆转速/

r·min^-1

粉体喂料速率/

kg·s^-1

螺杆直径/mm

原料粉体

材料

Tab.2. Process parameters

黏附力强度（F₀）/N	表面能 $(Γ$ ）/J·m^-2	塑性比（λ_p=1- $k 1 k 2$ ）	幂指数（n）	黏附分支指数（χ）	剪切刚度乘数（ξ_tm）
-0.001	15	0.8	1.5	20	0.67

黏附力强度（F₀）/N	表面能 $(Γ$ ）/J·m^-2	塑性比（λ_p=1- $k 1 k 2$ ）	幂指数（n）	黏附分支指数（χ）	剪切刚度乘数（ξ_tm）
-0.001	15	0.8	1.5	20	0.67

Tab.3. EEPA model parameters

Fig.2. 3D particle morphology of the KE element

Fig.3. Particle size distribution of different CR

Fig.4. Accumulated mass fraction⁃size distribution curves

Fig.5. Relationship between characterization diameter and CR

Fig.6. Size span⁃CR curve

Fig.7. Granulation yield⁃CR curve

Fig.8. 3D particle morphology of the KE element

Fig.9. Particle size distribution of the sample prepared at different screw scale

Fig.10. Accumulated mass fraction⁃diameter distribution curves

Fig.11. Characterization diameter⁃screw scale curves

Fig.12. Size span⁃screw scale curves

Fig.13. Granulation⁃screw scale curve

Fig.14. Residence time⁃screw scale curve

Fig.15. Effect of screw scale on powder motion velocity

Fig.16. Plastic overlap of contact surface⁃screw scale curve

Fig.17. Schematic diagram of the formation of high shear zone in KE element

References 15

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