Steam Boiler

Resin and benefits of de gasser


In this lesson, we will discuss the resin and benefits of de gasser.

Firstly we will discuss the resins then after we will discuss the benefits of de gasser.

Resin

In D M plant there are three types of resin used for boiler feed water treatment process –

Cation exchange resin
Anion exchange resin
Mixed Bed resin
Resins are chemical substances (usually polymers of high molecular weight) used to react with salts and eliminates them by chemical process.
As the name suggests, the cation exchange resin, exchanges the cation and anion exchange resin, exchanges anions with the salts dissolved in hard-water.

Mixed Bed Resins
These mixed bed resins are used in Demineralization plant of boiler feed water treatment, to remove the ions (especially Na+ and SO32-) which may further present in the water after foregoing process of purification.

Now we will discuss the function of de gasser

Function of de gasser
The function of degasser tower is to remove carbonate ions by forming carbon-di-oxide. In degasser tower stream of water is poured from top and air is blown from bottom to top. In the pressure of air the carbonic acid (H2CO3) present in the water dissociates into H2O and CO2.
This CO2 is free to mix with air.

Benefits of using degasser are:

It removes the carbonic acid and other gases mixed with water by simple physical method and thereby reduce the chances of corrosion.
It saves the resins which are very costly chemicals and thereby improves the economy of boiler feed water treatment process.
The H2CO3 free water is now collected in degasser sump and then pumped to anion exchange resin inlet.

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