What are the two basic styles of deaerators?

The two basic styles of deaerators are indeed identified as spray and tray. Understanding these types involves recognizing how they operate to remove dissolved gases, primarily oxygen, from water, which is crucial to prevent corrosion in boiler systems.

In a spray deaerator, water is sprayed into a steam chamber where it comes into contact with steam. This method utilizes the large surface area created by the fine droplets of water to facilitate effective gas removal, with the steam effectively stripping the dissolved gases from the water. As a result, the water gets degassed as it falls down through the deaerator.

Alternatively, a tray deaerator employs a series of trays or plates that allow water to flow down through these levels while steam rises from below. The trays provide multiple contact points between the steam and the liquid, enhancing the gas-exchange process. This design is effective in ensuring that water is adequately deaerated as it cascades down through the trays.

Understanding these styles helps in selecting the right type of deaerator for specific applications based on factors like the volume of water to be processed and the required efficiency of gas removal. The other options mentioned, while they pertain to different operational principles or methods, don't represent the fundamental designs of deaerators.