How oxygen remove from boiler?

• Mechanically: it can be done by de-aerating equipment

• Chemically: Add chemical in boiler water, such as – sodium sulphite or hydrazine.

                        2Na₂SO₃ + O₂ = 2Na₂SO₄

                        N₂H₄ + O₂ = 2H₂O + N₂

*** Maintain hot well tank temp (feed water temp above 90°C)