Air dispersion is guided by perforated plates or blade channels to create a pressure drop, so the flow is balanced in all directions. This gas enters the air dispersant and is fully mixed, and no temperature gradient is the key to the introduction pipe. Therefore, it is important to use the internally generated mixed gas flow for any type of water heater, or the mixing section is placed between the heater and the air disperser. The air disperser is usually built on the top of the drying room and the atomization device is placed at or near the air disperser.
This arrangement allows for instant and complete mixing of heated dry gas and mist cloud. In order to fully understand the spray characteristics of the dry powder, it is necessary to inspect the body to dry a single drop. Generally speaking, there are many very small particles suspended in a sphere of liquid. When the droplet first contacts the hot gas, rapid evaporation occurs. The substance dissolved in the liquid will form a thin shell on the surface of the sphere. Although evaporation makes the particles themselves cool, because the concentration of the liquid decreases, the particles will start to heat up.
The evaporation then only requires the liquid as quickly as possible to spread to the surface of the sphere. The drying process at this stage is called primary drying or diffusion rate limitation. This stage occurs when the drying gas of the dryer is at the cooler part of the dryer outlet. Therefore, the solids in each particle are not heated to the outlet temperature of the dryer, even if the protease dedicated centrifugal spray dryer may be quite high. The dry powder will be about 20°C cooler than the air outlet temperature.