The drying process of centrifugal spray drying equipment can be divided into three stages:
1. Use a fine spray of a spray dryer or drop any liquid feed in the atomization process, the spray contacts and suspends the hot gas through a stream that allows the evaporation of the liquid and the removal of dry solids;
2. Atomized droplets of similar shape and size;
3. In the passing gas stream, the dry powder material is divided and collected.
The use of various types of spraying can be divided into three methods: centrifugal, sonic atomizing nozzles, and air.
1. Centrifugal spraying: The roofing medium itself may vary from as small as 15 microns to 250 microns, however, it is greatly dependent on the amount of energy that has been sent to the liquid. In addition, mass flow, solids content, viscosity and surface tension, have a direct effect on particle size, but not the extent of the peripheral speed of the wheel. Thus increasing the feed rate may also increase the particle size, but using a variable speed centrifugal nebulizer can facilitate the correction of the size that has been specified.
Second, sonic atomizing nozzle spraying: Another common type of spray atomizing nozzle is hydraulic pressure. The fluid is pressurized by a pump and then forced through the pores to divide the liquid within the fine droplets within the pore size range of approximately 0.5 to 3 mm.
3. Air spraying: The method used for small spray dryer systems is pneumatic atomization in two fluids. Where atomization is achieved, an environment is created through the interaction of a first fluid with a second fluid which is often compressed air. In this case, neither the air pressure nor the liquid requirements are very high.
