Mechanical principle of Spray Dryer

- May 18, 2017-

Spray dryer is to make liquid materials through the spray spray into micro-mist droplets, in the drying tower contact with hot media, drying into the thermal process of powder. Feed can be a solution, suspension or paste, atomization can be achieved through rotary atomizer, pressure-type atomizing nozzle and gas flow atomizing nozzle, operating conditions and drying equipment design can be based on the product requirements of the drying characteristics and the specifications of the particle selection.

Spray dryer is the fastest development in the field of drying, the most widely used in a form, suitable for solution, emulsion and pumped liquid materials, such as suspended solids to produce powdery, granular or blocky solid products. The drying characteristics of heat sensitivity, viscosity, fluidity, etc., and the different quality requirements of the particle size, granularity distribution, residual moisture content, accumulation density, particle shape, etc., determine the structure form of different atomizer, airflow movement mode and drying chamber.

Through the ball mill slurry in the stirring groove further stirred evenly and heated to 35 ℃ above, and then pressure in the stirring groove, under the effect of stress, slurry is sent to Atomizer, after atomization spray from the lower tower body into the tower. N2 by the heat exchanger of oil and gas is sent to the top of the gas distributor of the tower body, after the gas distributor, N2 evenly, a whirlwind into the tower body, the atomized slurry to dry granulation. The liquid on the surface of the pellet and the hot gas is rapidly evaporating, and the internal gases migrate to the surface during the subsequent drying process to be taken away by hot gases. After drying the material grains fall to the bottom of the tower body, through a pair of disc valve clearance type recycling.