One of the world's most efficient biomass-based district heating plants...

Hollensen Energy A/S is building one of the world’s most efficient biomass based district heating plants in Lillestrøm, just outside Oslo, Norway. The Plant is being build for Akerhus Fjernvarme (district heating) and will supply hot water for a newly build district heating system, which is part of Akerhus Energy’s billion kroner venture in renewable energy. The Plant can produce 60 MW of which 20 MW is produced from biomass. This will reduce CO2 emissions by more than 30,000 tons per year.
 

Hollensen Energy A/S is delivering all the boilers and other equipment in connection with the plant, which consists of three oil boilers, one biogas boiler and two woodchip boilers. The Woodchip boilers have an estimated efficiency of 118% calculated on the lower heating value. This high degree of useful effect is obtained using a heating pump cooling the flue gas below the district heating system’s return temperature. The energy used to operate the heating pump is delivered directly from the woodchip boilers.

The woodchip boilers can use woodchips with a humidity of up to 55%. The whole plant is fully automatic and equipped to run unstaffed. The plant does however require daily supervision in consideration of safety and operational optimisation.

The plant will be handed over to the developer in May 2010.