Deaerator Venting: The Good, the Bad, and the Inefficient

  • 23 janvier 2024
  • Author: Jeff Lazor
  • Number of views: 4855
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Deaerator Venting: The Good, the Bad, and the Inefficient

A properly functioning deaerator is critical to the protection of steam boiler systems. Venting is important for the proper operation of a deaerator. Routine monitoring of venting can provide clues for identifying and solving potential problems. When deaerators have issues, they send out distress signals for all to see, but so often they are overlooked. The vent is rarely where it can be conveniently observed and in many cases it isn’t even visible. The vent’s physical layout can tell you a lot, but the venting can tell a story like no other.

All About Deaerators

The Often Overlooked and Undervalued Boiler Protectors

  • 10 décembre 2019
  • Author: James McDonald
  • Number of views: 11075
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All About Deaerators

Steam boilers do exactly as their name implies, they produce steam; however, may factors must be considered and managed to do this, including corrosion, scale, water minimization, fuel efficiency, safety, and Total Cost of Operation. Boiler feedwater often contains dissolved gases, such as oxygen, carbon dioxide, and ammonia. These dissolved gases are problematic for the boiler system because they may cause corrosion, leading to equipment failures (e.g., carbon dioxide can form carbonic acid in boiler condensate, lowering the pH, and corroding the condensate piping). To minimize corrosion, the dissolved gases must be removed or neutralized. This can be achieved through the use of deaerators, which work to remove such dissolved gases to low levels reducing the amount of follow-up neutralization required (e.g., sulfite-based oxygen scavenging).

Deaerator Design and Operation

  • 12 février 2019
  • Author: Chem-Aqua, Inc
  • Number of views: 25605
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Deaerator Design and Operation

A deaerator preheats boiler feedwater and removes dissolved gases, especially oxygen and carbon dioxide. These gases are undesirable because they cause corrosion and increase treatment chemical requirements. 

Deaerators operate based on the reduced solubility of dissolved gases as temperature increases. For example, the solubility of oxygen decreases from about five ppm at 150ºF to about two ppm at 190ºF. Virtually all the free carbon dioxide gas is removed by increasing the temperature to greater than 170ºF.

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