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How to remove the oxygen in a boiler with sodium sulfite?

Time : 2021-05-08 Hits :

1.Why is it necessary to remove the oxygen in a boiler?

When the metal of the heating surface  of the boiler is accumulated  with dirt, because the heat cannot be transferred to the water in time,

the temperature of the metal surface is high, where the protective film is destroyed and is corroded by the oxygen dissolved in the water, forming the iron oxide dirt Fe (OH)3 ferric hydroxideand Fe3O4ferriferrous oxide.

2.What is the principle of deoxidization  with sodium sulfite?

Using sodium sulfite to deoxidize is a simple, low-investment, easy-operating and non-toxic and harmless method. The principle of boiler on is that sodium sulfite is a reducing agent, which can react with dissolved oxygen  in water to produce sodium sulfate.

2Na2SO3+O2—→Na2SO4

The free oxygen in the water is fixed by the reducing agent sodium sulfite  and cannot oxidize the metal iron, protecting the boiler from corrosion.

3.How is it done?

As can be seen from the molecular formular above, one portion of oxygen needs eight portions of sodium sulfate to deoxidize.In practical operation, normally a 2% ~ 10% solution is prepared and added using a pump  or dosing dish.

Since Na2SO3 can react with the oxygen in the air, the dosing system used should be insulated from the air.