Boiler deoxidizers are chemicals used in water treatment to remove dissolved oxygen from the feedwater in boilers. Dissolved oxygen can cause corrosion and pitting in metal surfaces, which can lead to leaks and other problems in boiler systems. Deoxidizers work by chemically reacting with dissolved oxygen to remove it from the water before it enters the boiler.
Here are some common types of boiler deoxidizers:
- Sodium Sulfite: Sodium sulfite is a white crystalline powder that reacts with dissolved oxygen to form sodium sulfate. It is commonly used as a deoxidizer in low-pressure boilers.
- Hydrazine: Hydrazine is a colorless liquid that is highly effective at removing dissolved oxygen from water. It works by reacting with oxygen to form nitrogen gas and water. Hydrazine is often used in high-pressure boilers where low levels of dissolved oxygen are required.
- Carbohydrazide: Carbohydrazide is a white crystalline powder that is similar to hydrazine in its deoxidizing properties. It reacts with dissolved oxygen to form nitrogen gas and water.
- Catalyzed Sodium Sulfite: Catalyzed sodium sulfite is a modified form of sodium sulfite that contains a catalyst to increase its deoxidizing efficiency. It is often used in high-pressure boilers where strict control of dissolved oxygen levels is required.
- Sodium Erythorbate: Sodium erythorbate is a food-grade deoxidizer that is commonly used in steam boilers used for food processing. It reacts with dissolved oxygen to form harmless byproducts and is considered safe for use in food applications.
It is important to select the appropriate deoxidizer based on the specific requirements of the boiler system and to follow proper dosing and application procedures. Improper use of deoxidizers can lead to overfeeding or underfeeding, which can result in corrosion and other problems in the boiler system.