What are the two forms of ammonia commonly added to boiler water?

The addition of ammonia to boiler water serves a crucial purpose in maintaining water quality and preventing corrosion. The two forms of ammonia commonly utilized for this purpose are ammonium hydroxide and ammonium sulfate.

Ammonium hydroxide, when added to the boiler water, acts as a pH adjuster. It helps raise the pH of the water, reducing the potential for corrosion of the metal surfaces inside the boiler. It is especially useful in systems that operate at higher pressures.

Ammonium sulfate is often added as a source of ammonia that reacts with other contaminants in the feedwater, aiding in the precipitation of impurities such as calcium and magnesium salts. This removal of hardness-forming ions is essential in preventing scale formation within the boiler, which can lead to inefficient heat transfer and potential failures.

The combination of these two forms effectively contributes to the boiler's operational integrity, efficiency, and longevity by managing pH levels and controlling impurities. Therefore, this answer provides a comprehensive understanding of how these substances interact with boiler water chemistry and their functional benefits.