mirror surface Milk powder fruit juice Spray dryer manufacture

Application

1. Spray dryer can be used for drying of ny substances both in solution or in suspension.
2. Spray dryer are very useful for the drying of thermolabile substances.
3. Citric acid, borax, sodium phosphate, hexamine, gelatine and extracts are dried by a spray dryer.
4. The suspensions of starch, barium sulphate and calcium phosphate are also dried by the spray dryer.
5. Milk, soap and detergents too are dried by a spray dryer.

Description

In the spray dryer the liquid to be dried is sprayed in the form of mist. The minute droplets are readily evaporated and gets converted in to the solid particles, which fall to the bottom of the chamber.
The vapours are transferred in to the separator where the fine dry particles which are carried along with the vapours are separated and collected. Spray dryers are available in many forms and deigns.
A typical spray dryer consist of a drying chamber which is just like the cyclone separator, so as to ensure the good circulation of a air to facilaite heat and mass transfer and also to ensure that the dried particles are separated by the centrifugal action.

Features

1. This tendency of a liquid leadsto rise in the internal pressure which causes the droplets to swell.
2. The shells thickness decreases where as permeability for vapour increases.
3. If the shell is neither elastic nor permeable it ruputur and the internal pressure escapes.
4. The temperature of the air is adjusted in such a way that the droplets should be compeletly dried before reaching the walls of the drying chamber.
5. The products should not be over heated at the same time.

Technical Parameters

Spray Drying Stages

1. Atomizing: by atomizer, feed liquid is dispersed into even fog drops.
2. Contact of fog drops and hot air: through air distributor, hot air enters into drying chamber, fully mixing with fog drops and moves at a certain rule(the contact way can be co-current flow, adverse current, mixed flow)
3. Drying process: fog drops has big surface area, and appears obvious ”grades” to hot air both in temperature and humidity, thus strengthen the transmission process of “plastid caloric” moisture of fog drops is evaporated very quick(within seconds to tens of seconds)