Oxygen Treatment (OT) is a technique used to reduce corrosion of boilers and associated feed water systems in the flow-through of the boiler.
With oxygen treatment, oxygen is injected into the feed water to keep the oxygen level between 30-50 ppb. "The general injection point is only after the condensate polisher and again at the outlet deaerator." This forms a thicker hematite protective layer (Fe 2 O 3 ) above the magnetite. It is a denser and more flat film (compared to the undulation scale with OT) so there is less resistance to water flow compared to AVT. Also, OT reduces the risk of corrosion accelerated flow.
When OT is used, the conductivity after cation exchange (CACE) in the inlet economiser should be maintained below 0.15? This S/cm can be achieved by using a condensate polisher.
Video Oxygenated treatment
Comparison AVT to OT
Maps Oxygenated treatment
See also
- Heat recovery steam generator (HRSG)
- Flow-Correction Corrosion (FAC)
- Oxygen scavenger
- All volatile treatments (AVT)
References
Source of the article : Wikipedia
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