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8.4.5. The Dåva district heating <strong>and</strong> power station in Sweden (Umeå).
The Dåva plant (Picture 45.) generates heat <strong>and</strong> electricity by burning presorted
waste <strong>and</strong> residues from the wood products manufacturing industry –chiefly
biofuel. The efficiency is fully 99.5% thanks to effective recovery of excess heat
from power generation <strong>and</strong> in flue gases.
Located at Dåvamyran, four kilometers outside the city, the new plant has a
much smaller impact on the environment than the old one, not least because a
more efficient cleaning system has been added to the remaining old steam
generator. What is more, the content of oil in the fuel mix has been greatly
reduced. The new facility offered an opportunity to exp<strong>and</strong> the Umeå district
heating network, thus helping minimize the consumption of high-priced
electricity.
The plant consists of one process incorporating a grate combustion system, a
steam generator, a fabric filter, a flue gas treatment system with condensation,
<strong>and</strong> a wastewater treatment system. The design will readily lend itself to
expansion with a second train. (Figure 46) presents schematically the operation
of the Dåva plant.
Picture 45.: The Dåva district heating <strong>and</strong> power station in Sweden.
(Wastesum project Del 3A., 2010)