Summary:

Spray drying is the most widely used process in liquid forming and drying industries. It is most suitable for generating powder and granular solid products from solution, lotion, suspension and paste liquid raw materials. Therefore, spray drying is an ideal process when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product must conform to accurate standards.

Principle:

After being filtered and heated, the air enters the dry top air distributor, and the hot air enters the drying chamber uniformly in a spiral shape. The feed liquid is sprayed (rotated) by the high-speed centrifugal atomizer at the top of the tower body to form extremely fine atomized liquid beads, which are in parallel contact with hot air and can be dried into finished products in a very short time. The finished products are continuously output from the drying bottom and the cyclone separator, and the waste gas is discharged by the fan.

Technological process:

Feature:

◆ The drying speed is fast. After the liquid is atomized, the surface area is greatly increased. In the hot air flow, 95-98% of the water can be evaporated instantly. The drying time is only a few seconds. It is especially suitable for drying heat sensitive materials.

◆ The production has good uniformity, fluidity and solubility, high product purity and good quality.

◆ The production process is simplified and the operation control is convenient. The liquid with a wet content of 40-60% (up to 90% for special materials) can be dried into powder products at one time. After drying, there is no need to crush and screen, so as to reduce the production process and improve the product purity. The particle size, bulk density and moisture of the product can be adjusted within a certain range by changing the operating conditions, which is very convenient for control and management.

Main technical parameters: