The Alholmens Kraft power plant is a 240 MW biofuel-fired extraction condensing power plant, which produces about 100 MWth of process steam to the UPM-Kymmene Pietarsaari mills and about 60 MWth of district heating to UPM-Kymmene Pietarsaari mills and the town of Pietarsaari.
The boiler is a circulating fluidized bed boiler with natural circulation and reheating. The boiler is designed to generate 194 kg/s of steam,
at 165 bar(a) and 545°C, and reheated steam at 37 bar(a) and 545°C with bark, sawdust, wood waste, commercial biofuel and peat (coal firing option exists). The boiler can burn minor amounts of RDF as well. Heavy fuel oil is used during start-ups as an auxiliary fuel.
The steam turbine is a three-casing extraction condensing turbine with district heating and process steam supply. The condenser is cooled with seawater. The design of the turbine and condenser also allows operation in pure condensing mode without heat extractions.
Pöyry's services included:
expediting audit of the steam turbine plant delivery
supervision of the detailed design of the steam turbine plant
performance guarantee tests