Oxygen scavenging chemicals are very often added to the deaerated boiler feedwater to remove any last traces of oxygen that were not removed by the deaerator. The most commonly used oxygen scavenger is Sodium Sulfite (Na2SO3). It is very effective and rapidly reacts with traces of oxygen to form Sodium Sufite (Na2SO4) which is non-scaling. Another widely used oxygen scavenger is hydrazine (N2H4).
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