Which inhibitor type is used as an oxygen scavenger in boiler water treatment?

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Multiple Choice

Which inhibitor type is used as an oxygen scavenger in boiler water treatment?

Removing dissolved oxygen from boiler feedwater is essential to prevent corrosion of steel components. An oxygen scavenger is a chemical that reacts with dissolved oxygen to remove it from the water. Sodium sulfite is a classic oxygen scavenger: it reacts with O2 to form sodium sulfate, 2 Na2SO3 + O2 → 2 Na2SO4, thereby reducing the amount of oxygen available to oxidize metal. The other substances do not remove oxygen themselves: sodium chloride is simply a salt that can promote corrosion; sodium phosphate mainly acts as a pH buffer and helps with phosphate-based corrosion control but does not scavenge oxygen; polymer-based anti-scaling agents prevent mineral deposition and do not remove dissolved oxygen.

Removing dissolved oxygen from boiler feedwater is essential to prevent corrosion of steel components. An oxygen scavenger is a chemical that reacts with dissolved oxygen to remove it from the water. Sodium sulfite is a classic oxygen scavenger: it reacts with O2 to form sodium sulfate, 2 Na2SO3 + O2 → 2 Na2SO4, thereby reducing the amount of oxygen available to oxidize metal. The other substances do not remove oxygen themselves: sodium chloride is simply a salt that can promote corrosion; sodium phosphate mainly acts as a pH buffer and helps with phosphate-based corrosion control but does not scavenge oxygen; polymer-based anti-scaling agents prevent mineral deposition and do not remove dissolved oxygen.

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