Which property does sodium sulfite provide in boiler operation?

Sodium sulfite plays a key role in boiler operation primarily as a corrosion inhibitor. In steam systems, it helps to protect metal surfaces from oxidation by scavenging dissolved oxygen in the water. The presence of oxygen can lead to pitting corrosion and general deterioration of boiler components over time. By effectively reducing the levels of dissolved oxygen, sodium sulfite helps maintain the integrity of the boiler’s metal components, extending its operational lifespan and improving overall efficiency.

While other practices in boiler water treatment involve acid neutralization, scaling prevention, and foam reduction, these functions are not the primary role of sodium sulfite. For example, acid neutralization is typically accomplished using compounds like sodium bicarbonate; scaling prevention often relies on phosphate additives or other treatment methods designed to handle hardness minerals; and foam reduction usually involves specific agents to manage the stability of steam bubbles. Therefore, sodium sulfite is specifically valued for its corrosion-inhibiting properties in boiler operation.