Influencing factors of fluidized bed granulator
The fluidized bed granulator manufacturer tells you that fluidized bed granulation is also called boiling granulation or one-step granulation. It is to put the materials into a closed container at a time, mix the materials uniformly in the container, and then bond them through the equipment The agent is sprayed in at a uniform speed to fully mix the adhesive and the material, flow in the container to form small particles, and send hot air through the bottom to dry the wet particles, and finally directly collect the dry particles of the finished product.
1. Fluidization gas velocity
The fluidized bed granulator manufacturer tells you that the fluidization gas velocity directly affects the fluidization state of the bed. When the fluidizing gas velocity is too low and the bed temperature is too high, it is easy to cause "dry" instability. At this time, the heat brought by the fluidizing gas is not enough to evaporate the solvent in time, which will cause the "wet" instability of the bed; Excessive gas velocity will increase wear and reduce the effect of granulation.
2. Fluidized bed temperature
The fluidized bed granulator manufacturer tells you that when other operating conditions are the same, the bed temperature is low, the humidity in the bed is high, and the atomized droplets are easy to spread on the surface of the particles to form a larger solid-liquid contact area, so the particles are easy to agglomerate after collision. , So the particle growth rate is fast; but too low bed temperature can easily lead to wet dead bed. On the contrary, when the bed temperature is high, the production capacity is higher, the equipment utilization rate is high, and the heat transfer temperature difference and heat transfer efficiency of the fluidized bed are improved; however, an excessively high bed temperature will reduce the efficiency of granulation, mainly because The atomized droplets are dried before they come into contact with the fluidized particles, and the dried dust is lifted out with the high-speed flowing gas.
3. Material liquid flow rate
The fluidized bed granulator manufacturer tells you that when sufficient heat supply is ensured and the fluidization is better, the greater the flow rate of the material liquid, the faster the particle growth, and the particle size growth rate decreases with time.
4. Initial particle size
The fluidized bed granulator manufacturer tells you that the larger the initial particle size is, the relative growth rate of the particles will decrease. It is generally believed that as the initial particle size increases, the dispersion force caused by collision wear and self-gravity will increase, which will reduce the success rate of agglomeration. , The proportion of layered mechanism growth increases; when the initial particle size is small, the particles are more likely to agglomerate, so the particle growth rate is greater.
The fluidized bed granulator manufacturer tells you that in general, the viscosity of the binder increases significantly with the increase in concentration, the particles are more likely to agglomerate, and the growth rate increases.
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