Explain with the help of a neat sketch one of the evaporators covered under the group of natural circulation evaporators.

Explain with the help of a neat sketch one of the evaporators covered under the group of natural circulation evaporators.
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1 Answer

Answer :

Natural circulation evaporators: The movement of liquid takes place as a result of convection current set up by heating process. Ex. evaporating pan, evaporating still, and short tube evaporator. 

1. Evaporating pan:

It consist of a hemispherical pan made from copper or stainless steel and surrounded by a steam jacket.

Hemispherical shape provide large surface area for evaporation.

It consist of product outlet for fixed evaporating pan.

In other type evaporator is mounted in such a way that they can be tilted.

Diagram: 

image
2. Evaporating still:
It consist of a hemispherical pan made from copper or stainless steel.
It is surrounded by a steam jacket.
Still is covered from top and connected to condenser.
Hemispherical shape provide large surface area for evaporation.
It consist of product outlet at bottom.
Diagram:
image
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