Vacuum degassing is one of the thermal degassing processes. With vacuum degassing, water can also be degassed below 100 °C by boiling. Creating a corresponding negative pressure (partial vacuum) in the degassing unit enables the boiling point to be reached as early as in the 30-80 °C range. This degassing process is suitable when no hot steam is available for operating thermal pressure degassing.
Here degassing takes place in a percolator with a spraying unit, packing and supply section. The gases are removed via a vacuum pump with the resulting water vapour. It is preferable to use an exhaust vapour condenser to enable the vacuum pump's intake volume flow to be kept low. The residual oxygen content of 0.02 mg/l can also be achieved here.
Vacuum degassing is used for treating supplementary water for heating systems.
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