Thermal Degasser

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Thermal Degasser: Corrosion protection and efficiency

TECHNICAL BLOG

Thermal Degasser: A Key Solution for Corrosion Protection and Efficiency

In steam systems, dissolved oxygen (O2) and carbon dioxide (CO2) in feedwater are the main causes of corrosion. A thermal degasser removes these gases by bringing water into contact with steam under ~0.2 barg and ~105 °C conditions, thereby extending the life of boilers and pipelines while improving efficiency.

How It Works

Water from the condensate tank is distributed over separation trays inside the degasser tank and brought into intensive contact with steam. CO2 begins to separate from water at around ~65 °C, while O2 separates at approximately ~102 °C. The released gases are continuously vented through the dome of the tank.

  • Installation: To ensure cavitation-free operation of the feedwater pump, the degasser is typically positioned ≈5 m above the ground level.
  • Condensate Temperature: When the tank temperature reaches 80–90 °C, the dissolved gas content decreases, reducing chemical consumption.
  • Low Condensate Return: In processes below 80 °C, compared to high chemical and blowdown costs, a thermal degasser is a more economical and sustainable solution.
Key Advantages
  • Reduced Corrosion: Removal of O2/CO2 protects the boiler, economizer, and piping.
  • Energy Efficiency: Higher feedwater temperature enables faster steam production and lower fuel consumption.
  • Lower Chemical & Blowdown Needs: Chemical usage and blowdown frequency are optimized.
  • Operational Safety: Reduced cavitation risk and stable feedwater conditions.
~0.2 barg
Operating pressure
~105 °C
Feedwater temperature
≈5 m
Recommended pump height