USING DEGASIFICATION TO CREATE STEAM
Dissolved gases can be disruptive to the water-vapour cycle. Oxygen has an oxidizing effect, which promotes the formation of corrosion of metallic surfaces (pipelines, steam boilers, heaters, turbine blades and other surfaces). Carbon dioxide can have negative effects on the conductivity of pure water and reduce the regeneration cycles of ion-exchangers which can lead to higher operational expenses. The removal of these gases from the water is advisable for these reasons.
Using membranes to degasify the water is an effective non-chemical technique. The separation of the water from the gas molecules is done by diffusion at a membrane. Using this technique allows residual oxygen-content of less than 1 µg/l and a residual content of free carbon dioxide of less than 1 mg/l to be achieved. The special advantages of membrane degasification include the minimal space requirement in comparison with thermal, vacuum and precipitating degassers. The low energy demand (low water temperature and low supply pressure of less than 5 bar requirements) also benefit customers. Moreover, the need for chemical products (oxygen binders, ph-value adjustment agents) can be significantly reduced and might be entirely avoidable.
For many years, membrane degasification has been an established method for reducing dissolved oxygen and carbon dioxide in water.