Boiler Deaerator Working Principle

Deaerators are used in a variety of situations to remove dissolved gases from liquids, often water. Industrial boiler deaerators are similar to those used for other applications but with several unique aspects.

What is deaerator in boiler?

A boiler deaerator is a device used in boilers to remove air from the water supply. It is a vessel that is filled with water and has an outlet for steam and an inlet for feedwater. The deaerator acts as a separator, where the mixture of steam and liquid enters at one end of the drum and emerges as two separate streams at its opposite end. Typically, no heat transfer takes place across this interface; instead, it is more efficient to use mechanical means (usually by passing through screens) than thermal energy transfer methods (such as passing through tubes).

How does a boiler deaerator work?

A boiler deaerator is used to remove dissolved gases from boiler feed water. It does this by boiling the water, which causes the gases to come out of solution and be removed by the steam.

This process is similar to what happens when you boil a pot of spaghetti in a pot on your stovetop. As you heat up your spaghetti sauce, the water boils and some of it evaporates into steam that rises above the level of liquid in your pot. This gas-free "water vapor" then moves away from your pasta until it cools enough for some of its molecules to condense back into liquid form again—and voilà! You've got yourself some non-gassy spaghetti sauce.

How much is the boiler deaerator?

The cost of boiler deaerator is around $1,000 to $5,000 depending on the size of your plant and how much water you need to remove from your boiler feedwater.

Conclusion

Boiler deaerators are used to remove air from hot water, steam and condensate. Boilers use steam to heat water and this process can cause air bubbles or "foam" to form in the boiler. Deaerators do not remove all air from the process fluid but they are able to remove enough so that it does not impact the efficiency of the system being heated by the boiler.