Spray drying equipment is directly drying a solution or suspension device for drying solid particles. Dried material was obtained directly by the product, eliminating evaporation, crystallization, separation and crushing unit operations, continuous, automated production, stable operation. Using this method of drying, spray drying equipment in gas-solid contact surface area, drying time is short, usually drying time is 5 ~ 30s, suitable for drying heat sensitive materials. Drying the resulting product of good quality, the obtained microparticles 30 ~ 50μm, and instant products and good flowability. The disadvantage is the large volume of the dryer, the heat transfer coefficient is low, resulting in low thermal efficiency, large power consumption.
There classification spray drying equipment is very diverse, and can be divided according to the gas-liquid flow stream, countercurrent and Francis; by atomizer spray installation can be divided into the following formula, under spray; by atomization the structure can be divided into centrifugal, pressure and airflow; whether by circulating heated gas can be divided into the open, and closed part of the circulation.