Deaerator in Power Plants: Function, Working, and Importance

🌟 What is a Deaerator?

A Deaerator is a mechanical device used in power plants to remove dissolved gases — mainly oxygen (O₂) and carbon dioxide (CO₂) — from feedwater (the water entering the boiler).

Removing these gases is critical because they can cause corrosion in the boiler and steam system.

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🎯 Purpose of a Deaerator:

• Prevent corrosion in boilers, steam lines, turbines, and condensers.
• Improve efficiency and lifetime of the power plant equipment.
• Provide pre-heated feedwater to the boiler, improving energy efficiency.

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🔥 How It Works:

1. Heating:
   Steam is mixed with feedwater inside the deaerator, raising the water temperature close to its boiling point.

2. Gas Release:
   At high temperatures, the solubility of gases in water drops, causing dissolved oxygen and carbon dioxide to be released.

3. Vent Out:
   The released gases are vented out through the deaerator’s vent system.

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🛠️ Types of Deaerators:

• Tray-Type Deaerator: Water is sprayed onto trays where it comes into contact with steam.
• Spray-Type Deaerator: Water is sprayed directly into a steam atmosphere, promoting rapid heating and deaeration.

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⚡ Where It's Used:

• Thermal Power Plants
• Nuclear Power Plants
• Industrial Boilers
• Process Plants (like refineries, chemical industries)

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✨ Key Components:

• Deaerator Tank (storage and separation)
• Spray Nozzles / Trays
• Vent (to release gases)
• Booster Pump (to send deaerated water to boiler)
• Steam Inlet

 

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