Flue gas condensate treatment

Waste-to-Energy is becoming a more common method to reduce waste volumes “environmental friendly” and at the same time produce energy for our ever growing world population. The reason for flue gas condensation is mainly to comply with air emission limits, given by the law. The motives for treating the arising condensate differ quite a lot; from environmental regulations, internal water demands to economical benefits. Nevertheless, it can be stated that the overarching reason for flue gas condensate treatment is based on economical benefits; in form of reduced fees for e.g. fresh water or recipient. The occasion to choose just for membrane treatment is in most cases the advantage to recover process water and in this manner save communal water intake and costs for water preparation. In this way, this process can be labeled as product integrated environmental protective. Another reason for flue gas condensation is besides the reduction of air emissions, the possibility to recover heat which can be proceeded into the commonly found district heating network in Scandinavia.

1.Energy-rich water vapor from the fuel is often led out through the chimney

Flue gas condensate treatment is suitable for bio/waste fuelled power plants. Following advantage can be achieved.

Vaporzation heat recovered from flue gas
Gas emissions converted to water emissions
Recovery as boiler feed water and make up for district heating
Energy and water savings
Powerplant self sufficient in water

Cleaning of flue gas condensate with membrane technology, examples of references.
• EON, Örebro,
• EON, Norrköping
• C4, Kristianstad,
• Karlskoga
• Göteborgs Energi
• Sönderborg
• Öresundskraft, Helsingborg
• Eksjö Energi
• Fortum, Brista
• Mälarenergi Västerås
• Tekniska verken Linköping
• Amager Copenhagen
• Jönköping Energi
• Borås Energi
• Karlskoga Energi
• Västervik Miljö Energi

A flue gas condensate treatment consists of following main steps. More steps are available if higher water quality is needed.
• Screen filter 100 µm
• Ultrafiltration (UF) pre-treatment 150 kDa
• Police filter 1µm
• 2-pass-Reverse Osmosis (RO)

Ultrafiltration unit

2-pass-Reverse Osmosis

Filborna, power plant, Helsingborg, Sweden