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European Commission – Directorate General for Energy and TransportContract no: NNE5/2002/52: OPET CHP/DH Cluster

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New biomass fired BFB boiler – more efficient useof local biomass fuels in Äänekoski, Finland

A 157 MW th BFB-based power plant supplying the energy needs of a forest products and chemicals site employing some 1,200 people, and the local community, started operation at Äänekoski inCentral Finland in February 2003. Fired on local biofuels and peat, the plant is a turnkey delivery from Foster Wheeler Energia Oy, and will more than double local use of indigenous fuels, makingthe site almost self-sufficient in energy. The new plant will also see carbon dioxide emissions cut bya third .

Fired on a combination of bark, sludge, forest residues,wood residues, and peat, the new plant at Äänekoskiserves three customers - generating process steam andelectricity for M-real’s paper and board mill and acarboxymethyl cellulose (CMC) production facilityoperated by Noviant, and district heat for localmunicipal use.

The plant replaces old, smaller-scale capacity andoffers significantly reduced emissions. This oldcapacity was made up of various units, the largest ofwhich was a 78 MW fluidised bed unit converted froman old recovery boiler.

Fired on bark from the site’s pulp mill, it was toosmall, however, to make full use of the bark available,which was one reason behind the decision to go aheadwith the new plant.

The rest of local capacity was made up of two low- pressure boilers (40 MW, 100 MW) fired on heavy fueloil. Increasing use of these units to meet the expandingrequirements of the pulp and paper mills would haveincreased oil usage to as much as 35,000 t/a, at a timewhen bark was being exported off site.

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