The heat exchange in the drying equipment is mainly based on the two kinds of heat exchanges between the airflow and the particles, and the cylinder wall and the particles. The essence of the drying process is the diffusion process of moisture. It is carried out by external diffusion and internal diffusion. External diffusion is the process in which moisture on the surface of particles diffuses from the surface to the surrounding medium in the form of steam. Internal diffusion is the process by which water moves inside the particles.
1. The rotary flash dryer adopts high-speed hot airflow into the cylinder in the tangential direction. Due to the spiral movement of the airflow in the cylinder, the temperature of the medium around the particles is reduced, and the flow rate and temperature of the medium are increased, which greatly improves the external diffusion. speed.
2. The high-temperature airflow impacts the particles or small wet materials located in the lower part of the cylinder at high speed. At the same time, the stirring effect of the stirring blade in the cylinder causes the particles to be broken and the particle size is reduced. The effect is to reduce the resistance of internal diffusion. Most of these particles are repeatedly broken in the cycle of high temperature and high stirring intensity in the lower part of the cylinder. Eliminating the agglomeration of materials is also a powerful measure to promote internal diffusion and strengthen the evaporation of particle water.
https://www.stardrying.com/
