Type of CHP system: BFB boiler

Plant owner: Owned by the two municpalities Sala and Heby

Commissioned: 1999

Status of plant: Commercial

Contractor details: Foster Wheeler OY

Power generation: Steam turbine

Flue gas condenser on 7-8 MW. Installed summer 2003

Main fuel: Wood chips

Bark and  wood chips with a moisture in the range 45-55 %

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 36 MW

Total thermal input, incl. fossil fuels: 36 MW

Gross electrical output: 10 MWe

Net electrical output: 9,3 MWe

Heat output: 27 MJ/s

Electrical efficiency, gross: 28 %

Electrical efficiency, net: 26 %

Overall efficiency, gross: 103 %

Flue gas condenser on 7-8 MW

How is plant controlled: By heat demand

Heat backup: Three oil-fired boilers on 12 MW and one on 10 MW, all adapted for mbp biofuel 18 (fish oil). One electric boiler on 6 MW.

Heat usage: Heating only

Energy usage:

The major part of the energy consumers are residential districts and premises

The heat market is on 120 GWh.

850 heat consumers and 12 000 electricity consumers

District heat coverage (% of total demand in DH network): 80 %

DH inlet temperature: 120 °C

DH return temperature: 70°C

Heat storage size: 2000 m3

Hours of full load that the heat storage can meet: 4 h

Fuel storage: 3200 m3s, 3 days

Waste water: The waste water is delvered to the sewage treatment plant

Ash discharge: Recycling

Fuel feeding system:

The size of the storage is sufficient for three days full load . Transport from the pocket to the storage(3 200 m3) and further to the day silo is handled by a clutching-tongs. The transport from the day silo to the pocket in the boiler houes is handled by scrape, screw conveyor and elevator. After the the screw conveyor is it a crusher.

Boiler: BFB

Turbine: Axial-turbine

Steam data: 80 Bar, 480 degree Celcius, 42,8 tons/hr

Flue gas cleaning:

Elctrostatic precipitator

Bring back some flue gas

Cooling system: District heating

80 Bar, 480 C / 40-70 C

Staff: 12 employees, One person is needed to operate the plant at daytime. The same at night

Electricity sale info: The electricity is sold to 12 000 customers

Total capital cost: € 14,000,000

Data collected and quality assured by: Swedish Biomass Association.

Contact person: Johan Vinterbäck