In thermal full deaeration systems in principle, exhaust vapours, also referred to as waste steam, accumulate. The exhaust vapours are necessary for removing harmful gases such as oxygen (O2) and carbon dioxide (CO2) from the feed water vessel. In many boiler rooms this is evident from the steam plumes that normally exit via the roof.
As the feed water vessel is normally pressurised all year round to prevent oxygen permeation and corrosion problems associated with this, exhaust vapours are continuously produced. Exhaust vapour is also produced at the times when the boiler is in standby mode.
Two possible options are available for reducing the exhaust vapour losses:
Product: Vapour cooler VC
Schematic representation of the vapour cooler used for thermal full deaeration (highly simplified representation)
Water treatment module WTM
Water service module WSM-V
Exhaust vapour condensate (roughly 35°C)
Vapour cooler VC
Exhaust vapours (103°C)
Via roof to the atmosphere