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Project DescriptionThe Alholmens Kraft power plant is a 240 MW biofuel-fired extraction con- densing 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.
ServicesProject development: • energy balance analysis of the
UPM-Kymmene Pietarsaari mills• feasibility studies and conceptual
design • residual value analysis of the power
plant of the old pulp and paper mill • participation in preparation of the contractual package of the project• environmental impact assessment
Pre-engineering:• pre-engineering package• procurement services for a steam
turbine plant
Basic and detailed design:• project management and coordination• general and process engineering time scheduling and supervision• procurement services for auxiliary
equipment and systems• hp piping design and procurement
services• implementation engineering of
process and building electrification• plant layout design (3D-model)• HVAC engineering services for
automation system procurement
Additional services:• expediting audit of the steam
turbine plant delivery• supervision of the detailed design
of the steam turbine plant
Service ProviderPöyry Finland Oy
Execution Period• Project development: 1996-1999• Implementation: February 1999 -
October 2001
Pöyryemail:[email protected]
Alholmens Kraft Power PlantPietarsaariFinland
Project development, management and engineering services for a 240 MW biofuel-fired extraction condensing power plant.
FLUIDIZED BED COMBUSTION POWER PLANTS
UPM-Kymmene
Pietarsaari
District heat load 0...60 MWth
Condensing loadapprox. 250 MWeMax. back pressure load: approx. 200 MWe
Process steam load 0...150 MWth
12 bar
6 bar
3 bar
165 bar545 oC194 kg/s 545 oC
Existingpowerplant
>
In 1996, the owners of the AlholmensKraft started developing a new power plant scheme for the UPM-Kymmene Pietarsaari mills with the following main goals:• investment shall be made on an off-
balance sheet basis• assetisation of the existing bark-
fired back-pressure power plant• a low production cost shall be
achieved by large-size and optimised thermal cycle
• high reliability and operational flex-ibility
• energy pricing shall be fully trans-parent to all shareholders
• the plant shall be environmentally sound and based on efficient use of biomass fuels.
The main responsibility for the pro-ject development was given to PVO Group which selected Pöyry as the principal external consultant.
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 545oC, and reheated steam at 37 bar(a) and 545oC with bark, saw dust, 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 star-tups as an auxiliary fuel. The steam turbine is a three-casing extraction condensing turbine with district heat-ing and process steam supply.
The condenser is cooled with sea water. The design of the turbine and condenser also allows operation in pure condensing mode without heat extractions.
The new plant will be operated in parallel with the old bark-fired power plant of the mill, which serves as a back-up and peaking unit. In addition to the Alholmens Kraft power plant, the pulp and paper mill is also sup-plied with steam and power from the black liquor recovery power plant owned by UPM-Kymmene.
SIMPLIFIED FLOW DIAGRAM
