Give the principle and working of Fluidised bed dryer.

Give the principle and working of Fluidised bed dryer.
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1 Answer

Answer :

Principle:

In FBD, good contact between hot air and particles to be dried is obtained which cause rapid drying.

Working of Fluidised bed dryer:

Two types of FBD are used in pharmaceutical industry. There are:

1. Vertical FBD

2. Horizontal FBD

The fluidising air stream is induced by a fan which is mounted in the upper part of dryer.

The air is heated to the required temperature in air heaters and passed through the wet material contained in a drying chamber fitted with a wire mesh support at bottom. The air flow rate is adjusted by means of recirculation control and fabric filter bags are provided to prevent the passage of fine particles. This type of FBD is a batch type dryer and the drying chamber is removed from the unit for charging ad dumping. The FBD available in different capacities ranging from 5 kg to 200 kg with an average drying time of about 20-40 min.

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