Principle and application of spray dryer

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1. Principle of equipment

Centrifugal spray dryer is the most widely used spray dryer in industrial production. The feed liquid is pumped to the high-speed rotating centrifugal atomization disk at the top of the dryer through the filter, and is instantly sprayed into extremely small mist droplets. The mist droplets evaporate rapidly after contacting the hot air. The powder product is collected by the bottom barrel of the cyclone separator, and the remaining exhaust gas is discharged after passing through the bag dust removal chamber or water film dust collector. On the surface of the dispersion disk, the liquid spreads in a thin film and is thrown out at high speed at the circumference. The atomization effect depends on the circumferential linear velocity and the feeding rate, and is also related to certain physical and chemical properties of the feed liquid.

The powder product obtained by the spray dryer is mainly collected by the cyclone separation principle. The total dust-containing gas of the equipment generates a high-speed cyclonic motion through the inlet vortexer to form a rotating airflow. The dust is separated from the airflow under the action of centrifugal force and its own gravity and moves downward to gather and be collected. The dust-free gas is sent from the upper outlet to the bag dust removal room or water film dust collector for further adsorption and collection.

2. Application fields

In the more than 100 years of history of the development of spray drying technology, it was initially limited to the production of egg powder, milk powder, detergent, cosmetics and other small products. With the continuous deepening of research and application, it has been widely used in the production of ultrafine powders and nano powders in the chemical, biological, food, pharmaceutical, ceramic and other industries.

Chemical industry: battery raw materials, dye intermediates, compound fertilizers, sulfuric acid, amino acids, white carbon black, etc.;

Biological: bacteria, enzyme preparations, proteins, peptides or other heat-sensitive biologically active materials;

Resins: AB, urea-formaldehyde resin, phenolic resin, polyethylene, polyvinyl chloride, etc.;

Food: fat-enriched milk powder, umbilical cord, animal blood meal, egg white whole egg powder, oats, chicken juice, coffee, instant tea, spiced meat, protein, soybeans, etc.;

Carbohydrates: corn syrup, corn starch, glucose, pectin, maltose, potassium sorbate, etc.; Ceramics: alumina, tile materials, magnesium oxide, talcum powder, etc.;

Traditional Chinese medicine: Chinese medicine extracts, Chinese medicine formula granules, Chinese medicine extracts, oral solid preparations, etc.