Deaerator
Mit Water supplies deaerator systems for removal of dissolved oxygen and other dissolved gases from water. Dissolved oxygen in boiler feed water, process water and injection water causes corrosion of carbon steel piping and equipment, significantly reducing service life and increasing maintenance costs.
Working Principle
Deaeration removes dissolved gases from water by applying Henry's Law: the solubility of a gas in water decreases with increasing temperature and decreasing partial pressure. In a thermal deaerator, water is heated to its saturation temperature using steam, and dissolved gases are stripped and vented. In a vacuum deaerator, a vacuum lowers the boiling point. In a membrane deaerator, a hydrophobic membrane allows gases to pass through while retaining liquid water.
System Configuration
Our deaerator systems are available as thermal (tray-type or spray-type), vacuum tower, or hollow fibre membrane contactors. Key components include the deaerator vessel, steam or vacuum system, vent condenser, feed pre-heater, transfer pumps, and a PLC control panel.
Deaeration is required in industries where dissolved oxygen causes corrosion:
- Power plant boiler feed water treatment
- Industrial boiler feed water for steam generation
- Oil and gas produced water for reinjection
- Semiconductor ultrapure water systems
- Pharmaceutical water for injection (WFI) systems
- Brewery and beverage process water deaeration
- District heating system make-up water
Technical Parameters
| Flow Rate | 1 to 500 m3/h per unit |
| Outlet Dissolved O2 | Below 7 ppb (thermal); below 50 ppb (membrane) |
| Deaerator Type | Thermal (tray/spray), vacuum tower, or membrane contactor |
| Operating Temperature | 102-105 °C (thermal); 15-40 °C (membrane) |
| Vessel Material | Carbon steel (thermal); SS304/SS316L (vacuum) |
| Membrane Material | PP or PVDF hollow fibre (membrane type) |
| Vacuum Level | 30 to 50 mbar absolute (vacuum type) |
| Control System | PLC with temperature, pressure, level and DO monitoring |