Deaerator Tank

Product Description

A deaerator tank is a key component in steam power plants and boiler systems. Its main function is to remove dissolved gases primarily oxygen (O) and carbon dioxide (CO) from feedwater before it enters the boiler.

These gases can cause corrosion in boilers, piping, and steam systems. Removing them greatly extends equipment life and improves efficiency.

What Is a Deaerator Tank?

A deaerator is essentially a pressurized tank that:

• Heats feedwater
• Removes dissolved gases through mechanical and thermal methods

How It Works - Basic Principle

It relies on Henrys Law, which states that the solubility of a gas in a liquid decreases as the temperature increases. By heating the feedwater close to saturation temperature, the dissolved gases are forced out and vented.

Main Components

Types of Deaerators

Tray-Type Deaerator

• Water flows over perforated trays.
• Steam rises through trays to heat and strip gases.
• High efficiency; common in large power plants.

Spray-Type Deaerator

• Feedwater is sprayed into a steam atmosphere.
• Simpler design; compact and lower capacity.

Typical Operating Conditions

Advantages

• Prevents oxygen pitting and corrosion
• Reduces need for oxygen scavenger chemicals
• Improves boiler efficiency
• Prolongs system lifespan

Common Issues

• Poor venting (residual gases stay in water)
• Improper level control (overflows or dry conditions)
• Scale buildup or nozzle clogging
• Temperature too low ineffective deaeration

Applications

• Thermal and nuclear power plants
• Industrial boiler systems (chemical, pulp & paper, food processing)
• Marine steam systems