What is the purpose of adding sodium sulfide to boiler feedwater?

• A. Maintain temperature
• B. Remove dissolved oxygen
• C. Increase pH levels
• D. Neutralize acids

Answer: (B)

Adding sodium sulfide to boiler feedwater primarily serves the purpose of removing dissolved oxygen. Oxygen in boiler feedwater can cause corrosion of the boiler system and associated components. By introducing sodium sulfide, it reacts with the dissolved oxygen to form sodium sulfate, effectively eliminating the oxygen that could lead to corrosion issues.

This is a critical step in maintaining the integrity and longevity of boiler systems, ensuring efficient operation and reducing the likelihood of operational failures caused by corrosion. While other methods exist for oxygen removal, sodium sulfide is a chemical approach that proves effective, particularly in systems where complete oxygen removal is necessary.

Maintaining appropriate water chemistry is essential in boiler operations, and this specific treatment plays a key role in safeguarding against damage that can arise from corrosive elements in the water.