Deaerator Basics – working, types, Benefits

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Introduction to Deaerator

Deaerator play a crucial role in the efficient and safe operation of industrial steam systems. These devices help remove dissolved gases and oxygen from boiler feedwater, ensuring the longevity and performance of steam boilers and associated equipment. In this blog post, we will explore deaerator in detail, discussing their function, benefits, and different types.

What Is a Deaerator?

A deaerator is a device used in various industries to remove dissolved gases, primarily oxygen and carbon dioxide, from boiler feedwater. The presence of these gases in feedwater can lead to corrosion, scale formation, and reduced boiler efficiency. By eliminating these gases, deaerators help maintain the integrity of the boiler system.

Maintenance And Inspection Of Steam Boilers

How Does a Deaerator Work?

Deaerators typically work on the principle of reducing the partial pressure of oxygen in the feedwater. The process involves several key steps:

  1. Preheating: Feedwater is preheated using steam to increase its temperature before it enters the deaerator.
  2. Spraying: The preheated water is then sprayed into the deaerator vessel, allowing it to come into contact with the atmosphere.
  3. Venting: As the feedwater is sprayed, the oxygen and other dissolved gases are released into the atmosphere. The released gases are continuously vented out of the deaerator.
  4. Storage: The deaerated feedwater is stored in a separate compartment of the deaerator, ready for use in the boiler.

Benefits of Deaerators

Deaerators offer numerous benefits in industrial processes:

  1. Corrosion Prevention: By removing oxygen, deaerators help prevent corrosion in the boiler and associated equipment, extending their lifespan.
  2. Improved Efficiency: Deaerated water heats up faster, improving the efficiency of the boiler and reducing fuel consumption.
  3. Reduced Scale Formation: Deaerators minimize the formation of scale in the boiler, ensuring consistent heat transfer and reduced maintenance costs.
  4. Enhanced Steam Quality: Deaerated feedwater produces high-quality steam, which is essential for many industrial processes.
  5. Safety: Deaerators help maintain safe operating conditions by preventing the build-up of harmful gases.

Types of Deaerators

There are several types of deaerators, with the most common being:

  1. Tray-Type Deaerators: This design uses trays or packing material to maximize the surface area for efficient deaeration.
  2. Spray-Type Deaerators: Spray-type deaerators use a series of nozzles and sprayers to facilitate gas removal from feedwater.
  3. Vacuum Deaerators: This type operates under a vacuum to further enhance gas removal efficiency.
  4. Spray Tray Deaerators: Combining the features of both tray and spray deaerators, this design offers superior deaeration.


Deaerators are indispensable in maintaining the integrity and efficiency of industrial steam systems. They effectively remove dissolved gases from boiler feedwater, preventing corrosion, scale formation, and enhancing steam quality. By understanding the function and benefits of deaerators, industries can ensure the reliable and safe operation of their steam systems, ultimately contributing to improved productivity and reduced maintenance costs.

Here are 10 frequently asked questions about Deaerators along with their answers:

What is a Deaerator?A Deaerator is a device used to remove dissolved gases, primarily oxygen and carbon dioxide, from boiler feedwater in industrial processes.
Why is Deaeration important?Deaeration is vital because it prevents corrosion, scale formation, and enhances the efficiency of steam systems by removing gases that can impair boiler performance.
How does a Deaerator work?Deaerators work by preheating feedwater, spraying it into a vessel, allowing the gases to be released, and then storing the deaerated feedwater for use in the boiler.
What are the benefits of using a Deaerator?The benefits of using a Deaerator include corrosion prevention, improved boiler efficiency, reduced scale formation, enhanced steam quality, and increased safety in industrial processes.
Are there different types of Deaerators?Yes, there are various types, including tray-type, spray-type, vacuum Deaerator, and spray tray Deaerator, each with unique features for efficient gas removal.
How do Deaerators contribute to safety?Deaerators help maintain safe operating conditions by preventing the accumulation of harmful gases in the boiler, reducing the risk of accidents.
Can Deaerated water improve boiler lifespan?Yes, Deaerated water reduces the risk of corrosion and scale formation, which can significantly extend the lifespan of the boiler and related equipment.
What is the role of oxygen removal in Deaeration?Removing oxygen is essential because it prevents oxygen-related corrosion in the boiler and improves the overall efficiency of steam systems.
What industries commonly use Deaerators?Deaerators are widely used in industries like power generation, chemical processing, food and beverage, and any application involving steam boilers.
How can Deaerator maintenance be optimized?Regular inspection, cleaning, and the use of appropriate chemicals can optimize Deaerator maintenance, ensuring it functions effectively over time.

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