Atomization of atomizer in spray dryer

Atomization of atomizer in Spray Dryer

Spray drying is a liquid raw material atomized atomized into droplets and droplets are contacted by hot air in the drying chamber. Spray produces rotary (wheel) or nozzle atomizer. The evaporation temperature and air flow conditions of water formed from droplets and dry particles are controlled. The powder is continuously discharged from the drying chamber. The importance of nebulizer in spray dryer is obvious.

Different atomizers can produce different atomization forms. According to different atomization forms, the spray dryer can be divided into airflow atomization, pressure atomization and centrifugal atomization.

1. Air flow atomization uses compressed air (or steam) to spray from the nozzle at high speed and mix with the material liquid transported by another channel. With the help of the friction generated by the different relative speeds between air (or steam) and material liquid, the material liquid is dispersed into droplets. The air flow atomizer has the advantages of simple structure, wide processing objects, but high energy consumption.

2. Pressure atomization: the liquid flows at a high speed inside the pressure atomizer. After the liquid is ejected from the pressure atomizer, it is divided into droplets from the liquid column shape, and the droplets are broken again in the gas

3. Centrifugal atomization uses the centrifugal force generated by the high-speed rotating disc or wheel to throw out the feed liquid and make it contact with the drying medium to form droplets. The centrifugal atomizer changes little under the influence of feed (such as pressure); Simple control.