demineralization process of water

Demineralization process of water:

Raw water cannot be directly used in the boiler, because it contains many mineral salts in the form of icons that are harmful to the boiler.

The mineral salts are classified into positive ions and negative ions'.

Positive ions are called cations and negative ions are called anions

cations  are calcium, magnesium, potassium, sodium

anions are bicarbonate, carbonate , chloride and nitrate

So these mineral ions must be removed from the water in order to increase the life of the boiler, efficiency of the boiler during operation. These minerals ions are removed by the ion exchange process.

In the ion-exchange process, the vessel will be filled with the ion exchange resin. There are two types of resin

i) Cation Exchange resin
ii) Anion Exchange resin

The cation exchange resin will release H+ ions in exchange for impure cation ions.
The anion exchange resin will release OH- ions in exchange for impure anion ions.






This resin must be regenerated after some time to remove the impure ions and bring back its Effectiveness.

Difference Between steam boiler and Steam Generator

Difference between a steam boiler and Steam Generator

Steam boiler:

 A steam boiler is a device which converts water to steam in the steam drum by boiling the water at subcritical pressure

Steam Generator

A steam generator is a device, which converts the water directly into steam in water wall without boiling the water at supercritical pressure