Hydrazine Dosing in water treatment process used in power plant

Hydrazine dosing is a common water treatment process used in power plants to remove dissolved oxygen from the feedwater and condensate water systems. Dissolved oxygen can cause corrosion in the steam and condensate systems, which can lead to leaks and reduced system efficiency. Hydrazine reacts with the dissolved oxygen to form water and nitrogen gas, which is inert and does not cause corrosion.

Hydrazine is typically added to the feedwater or condensate water systems at a controlled rate using a dosing system. The dosing rate is determined by the feedwater quality, the operating pressure of the system, and the boiler manufacturer’s recommendations.

Hydrazine dosing has several benefits, including:

1. Corrosion prevention: Hydrazine reacts with dissolved oxygen to form nitrogen gas and water, which helps prevent corrosion in the steam and condensate systems.
2. Improved heat transfer: Hydrazine dosing can help improve heat transfer in the system by reducing corrosion and scale formation.
3. Reduced maintenance costs: By reducing corrosion and scale formation, hydrazine dosing can help reduce maintenance costs associated with repairing leaks and replacing damaged equipment.

It is important to note that hydrazine is a hazardous chemical and must be handled and dosed in accordance with strict safety procedures. Overdosing can lead to the formation of a carcinogenic byproduct called hydrazine sulfate, which can be harmful to plant personnel and the environment.

In summary, hydrazine dosing is an important water treatment process used in power plants to remove dissolved oxygen from the feedwater and condensate water systems. The dosing rate should be carefully controlled and monitored to maintain the proper balance between corrosion prevention and safety.