Question

Differentiate natural circulation and forced circulation

Answer 1

Heya
here's your answer...
Natural circulation

Force circulation

1.

In Natural circulation boiler the circulation is done by means of nature.

In Forced circulation Boiler the circulation is done by the means of pumps.

2.

These type boilers are low capacity boilers.

These type boilers are of high capacity boilers.

3.

The heating of boiler parts is not uniform, so, there are chances of differential expansion of parts and hence chances of cracks are maximum.

The heating of boiler parts is uniform, so, there is no chance of differential expansion of parts and hence chances of cracks are minimum.

4.

These boilers take maximum time from cold start.

These boilers take minimum time from cold start.

5.

There is a scale formation between the water tubes and hence blockage of pipes.

There is no scale formation between the water tubes and hence no blockage of pipes.

6.

These boilers produce lesser steam and have low pressure steam.

These boilers produce steam at 30 to 650 tons per hour, at the temp of temp. & 160 bar pressure.
hope it helps...✌✌