The membrane degassing unit uses a microporous hollow fibre membrane to remove gases from water. The hollow fibre is knitted into an array and wrapped around a center tube inside the housing.
During operation, water flows over the outside of the hollow fibres while a vacuum, strip gas, or both in combination, is applied to the inside of the fibres. Because the membrane is hydrophobic, it allows direct contact between gas and water without dispersion.
Applying a higher pressure to the water stream relative to the gas stream creates the driving force for dissolved gas in the water to pass through the membrane pores. The gas is then carried away by a vacuum pump and/or sweep gas.
Removing CO2 after the reverse osmosis (RO) unit and before the EDI unit (or mixed bed) reduces chemical usage and increases EDI performance. Less CO2 loading improves silica removal as well. The goal is to reduce CO2 content before EDI to less than 5 ppm. Operation mode is air sweep.
To prevent corrosion and avoid use of chemicals.
Operation mode is vacuum pump with nitrogen as sweep gas.
Spend 2 min. in company with Lars Jørgen Dam, Head of production at Skanderborg-Hørning District Heating and learn the effect of correct water treatment.
The Danish District Heating Association has published its recommendations for correct water treatment to increase life cycles of key assets such as boilers, valves, fittings, installations, and underground piping.
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