How to control the inlet and outlet air temperature of spray drying equipment?

How to control the inlet and outlet air temperature of spray drying equipment? Spray dryer equipment is the use of hot air blown in to achieve aqueous solution / suspension liquid mist after drying
.

During the drying process, the hot air enters the drying tower from the tower mouth, and the exhaust gas after the drying work is emptied
by the induced fan.

In the process of spray drying equipment, the control of hot air temperature and exhaust air temperature when hot air enters the tower is very important, which determines the quality of the product and the density of drying bulk, so it needs to be strictly controlled
.

1.
In the operation of spray drying equipment, the exhaust air temperature is related to the moisture content of the product and should be determined
according to the moisture content of the product.

The higher the hot air temperature, the higher the thermal efficiency, and the better
the economic benefits.

However, too high hot air temperature will cause product quality to deteriorate
.

2.
In the operation of spray drying equipment, the hot air temperature will affect the bulk density
of the product.

High temperature hot air has a change in low loose density, which is due to the drying effect of hot air, hardening the surface of the particles and expanding the residual moisture, forming balloon-like hollow particles
.

If high bulk density (low specific capacity) is required, or solid particles are required, high temperature hot air should not be used in the design to contact
the newly formed droplets.