This article will explore the reasons why the spray granulation dryer has fine particles and propose corresponding solutions.
First, excessive air pressure is an important factor leading to fine particles. In the spray granulation process, air pressure determines the size and speed of the droplets. When the air pressure is too high, the droplets will be over-refined, resulting in a smaller particle size. Therefore, adjusting the air pressure is one of the key steps to control the particle size.
Secondly, the size of the original particle size will also affect the particle size of the final particles. If the particle size of the original material is too small, then during the spray granulation process, the degree of droplet refinement will increase, resulting in fine particles. Therefore, when selecting raw materials, their particle size should be taken into account to ensure that the original particle size is moderate.
In addition, the speed of the peristaltic pump feed rate will also affect the particle size. The slower the peristaltic pump feed rate, the longer the material mixing and homogenization time before spray granulation, and the higher the degree of droplet refinement, resulting in fine particles. Therefore, reasonable control of the peristaltic pump feed rate is an important means to obtain the ideal particle size.
In addition to the above factors, the solid content of the liquid feed, the size and shape of the nozzle, and the air intake will also affect the particle size. Too low a solid content in the liquid feed will result in too fine particles, while the size and shape of the nozzle determine the initial size and shape of the droplets. The air intake affects the residence time and temperature distribution of the droplets in the drying chamber, thereby affecting the degree of dryness and particle size of the particles.
In summary, there are many reasons for the fine particles of the spray granulation dryer, which need to be comprehensively considered and adjusted from multiple aspects such as air pressure, original particle size, peristaltic pump feed speed, liquid feed solid content, nozzle size and shape, and air intake. By optimizing these parameters, the ideal particle size can be obtained, and product quality and production efficiency can be improved.
