The heat exchange in the flash dryer equipment is mainly based on the two heat exchanges between airflow and particles, and the wall and particles. The essence of the drying process is the dispersion process of water, which is carried out by external dispersion and internal dispersion. External diffusion refers to the process in which the moisture on the outside of the particle disperses from the outside to the surrounding medium in the form of steam, and the internal dispersion is the process in which the water moves outside the particle.

  The flash dryer needs to be based on the specific parameters of the material, such as the state of the material, the type of moisture contained, the processing capacity, the characteristics of the material during the drying process, such as whether it is corrosive, whether the combustion generates static electricity, the specific requirements of the product, the heat sensitivity temperature of the material, etc., to determine the various parameters of the dryer. For this reason, many dryers cannot be mass-produced. In the design process, attention should be paid to the pertinence of materials and the adaptability to working conditions.

  1. The rotary flash dryer adopts high-speed hot airflow to enter the cylinder in a tangential direction. Because of 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 dispersion rate.

  2. The low-temperature airflow hits the particles or small wet materials at the lower part of the cylinder at a high speed. At the same time, the stirring effect of the stirring blade in the cylinder causes the particles to be broken, the particle size is reduced, and the length of the outer capillary is also reduced, which strengthens the effect of internal dispersion, reduce the resistance of internal dispersion. Most of these particles are repeatedly broken in the cycle of low temperature and high stirring intensity at the lower part of the cylinder, which eliminates the agglomeration of materials, and also promotes the weak pace of internal dispersion and strengthens the evaporation of particle water.

  Zhengzhou Jiutian is a professional manufacturer of flash dryers. If you have any requirements, please feel free to contact us.