Skanderborg-Hørning District Heating in Denmark has recently installed a membrane degasser for removing oxygen from the feedwater. Spend 2 min. in company with Lars Jørgen Dam, Head of production and hear how correct water treatment can prevent corrosion.
The main goal of correct water treatment is to prevent corrosion, deposits, and pipe fractures – in short, to extend the life of the plant. By removing salts and oxygen from the district heating water, as well as adjusting the pH value, the basis for corrosion is removed - including microbial corrosion.
Softeners have been a regular part of water treatment at district heating plants for many decades. But once calcium and magnesium is removed from the water, the presence of salts and oxygen will still affect the water quality. The conductivity will therefore be the same after softening.
Demineralization by reverse osmosis results in high salt rejection up to 98%. As a bonus, demineralized water makes it easy to detect raw water intrusions so that security of supply can be maintained. The oxygen can be removed with a membrane degasser. A chemical-free solution, and thus the need for oxygen binder can be reduced by more than 90% and in some cases completely omitted.
Raw water intrusion, corrosion products, and suspended magnetite will inevitably occur in the district heating circuit causing pollution and at worst breakdowns. However, it can be delayed significantly by using the proper technologies.
As a minimum, particle filtration with bag filter and magnetic insert is recommended. A magnetic insert in the particle filter efficiently collects magnetite residue from the circuit water.
We have selected a number of publications that are relevant to you working with district heating water.
75,000 m3 of softened water was needed for the filling of pit heat storage SUNSTORE 4 - a solar district heating network located on the island of Aeroe in Denmark. Mobile water treatment facility from EUROWATER handled the assignment within the 70-day timeframe.
If a temporarily water treatment problem arises, you can easily take care of it by renting a EUROWATER mobile water treatment plant. The video (2 min.) gives an example of, how the mobile water treatment plant handles a filling of thermal energy storage.
Whether you need drinking, disinfected, softened or demineralized water, we have a mobile solution.