The spray dryer is a kind of drying equipment widely used in chemical, food, medicine and other industries. Its working principle is to spray liquid materials into small droplets through the atomizer, and then quickly dry under the action of high temperature hot air to finally get dry powder or granular products. The spray dryer is mainly composed of the following parts, which are briefly introduced below:

1. Air inlet system: including a hot air blower, air inlet, and hot air duct, responsible for sending high-temperature hot air into the drying chamber.

2. Nebulizer: Liquid materials are atomized into small droplets. Common atomizers include pressure type, centrifugal type, and air flow type,

3. Drying chamber: Mist droplets rapidly evaporate and dry under the action of high-temperature hot air, forming powder or granular products.

4. Exhaust system: including exhaust outlets, exhaust fans, and dust collectors, responsible for discharging exhaust gases and keeping the drying room clean.

5. Material collection system: including cyclone separator, dust collector, and feeder, responsible for collecting dried products.

In a word, spray dryer is an efficient, energy-saving and environmentally friendly drying equipment, which is widely used in chemical, food, medicine and other industries. In practical applications, suitable models and parameters of spray drying machines should be selected based on factors such as material properties and production scale to achieve optimal drying effects and economic benefits.