Degasification “bucks up”
In the water-steam cycle dissolved gases can be disturbing. Oxygen has an oxidizing effect and promotes corrosion of metallic surfaces (pipelines, steam boilers, heaters, turbine blades etc.). Carbon dioxide can have negative effects on the conductivity of pure water and shorten the regeneration cycles of ion-exchangers. This leads to higher operation costs. For this reason it makes sense to remove these gases out of the water.
Degasification via membranes is an effective non-chemical method. The separation of the water- from the gas molecules at a membrane is done by diffusion. By means of this procedure an economic residual oxygen-content of < 1 µg/l respectively a residual content of free carbon dioxide of < 1 mg/l can be achieved. Particular advantages of membrane degasification are the low space requirement in comparison with thermal, vacuum- respectively falling degassers on the one hand, and low energy demand (low water temperature and low supply pressure < 5 bar necessary) on the other. Moreover the need in chemical products (oxygen binders, ph-value-regulation) can be significantly reduced and it is even possible to completely do without it.
For many years membrane degasification has been an established method for reducing dissolved oxygen and carbon dioxide in water.
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