What is the purpose of adding hydrazine to the Main Feed?

Adding hydrazine to the main feed water serves primarily to scavenge oxygen and raise the pH. Hydrazine is a chemical commonly used in water treatment systems to eliminate dissolved oxygen, which can cause corrosion in boiler systems and other components. By reacting with oxygen, hydrazine prevents it from forming rust and other corrosive effects inside the pipes and equipment.

Additionally, the presence of hydrazine in the feed water can help to stabilize the pH levels. A higher pH reduces the solubility of many corrosive substances and promotes less aggressive conditions within the boiler and the entire steam generation system. This chemical is essential for maintaining the integrity and longevity of the system, thereby ensuring efficient operation and reducing maintenance costs.

Enhancing thermal efficiency, increasing water hardness, or reducing system pressure are not direct purposes of hydrazine addition in this context; instead, the focus for hydrazine use is primarily on protecting the system from corrosive damage and optimizing its overall performance through proper chemical balance.