I. Stevioside Pressure Spray Dryer--Overview of Equipment

As a new type of sweetener, stevioside can be widely used in various foods, beverages, medicines and daily chemical industries. It can be said that almost all sugar products can be replaced with stevia to replace some sucrose or all of the chemical sweeteners such as saccharin. The stevioside having a purity of 80% or more of stevioside is white crystal or powder, and has little hygroscopicity. Soluble in water, ethanol, mixed with sucrose, fructose, glucose, maltose, etc., not only the stevia flavor is more pure, and the sweetness can be multiplied. The sugar has poor heat resistance and is difficult to be lighted, and is stable in a pH range of 3 to 10, and is easy to store.

The stevioside pressure spray dryer is a special drying device suitable for drying liquids such as emulsions, suspensions, pastes, and solutions. Air passes through the filter and heater and enters the air distributor at the top of the dryer. The hot air enters the dryer in a spiral shape. The liquid is pumped from the liquid tank to the centrifugal atomizer of the dryer through the filter, so that the liquid is sprayed into extremely small mist droplets, and the liquid and hot air are in parallel contact, and the water evaporates rapidly, which is extremely short. Dry in a time to a powdered product. The finished product is discharged from the bottom of the drying tower and the cyclone, and the exhaust gas is discharged by the fan.

The spray dryer has accumulated a wealth of experience when drying the stevioside liquid with a solid content of about 50%. In view of the characteristics of the final product of stevioside, the unit's receiving system adopts a unique freezing and dehumidifying cold air cooling receiving device, which not only ensures that the material instantly leaves the high temperature area to avoid softening of the material, but also avoids the material in a high humidity environment. Under the phenomenon of moisture absorption.