Type of CHP system: BFB boiler

Plant owner: Owned by Falu Energi & Vatten AB, which is owned by Falun Municipality

Commissioned: 1993

Status of plant: Commercial

Contractor details:

Boiler: Ahlstrom

Turbine: AESA STAL

Power generation: Steam turbine

Main fuel: Multifuel (more biofuels and/or peat)

Forest residual, bark, sawdust, 50% moisture

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 36 MW

Total thermal input, incl. fossil fuels: 36 MW

Gross electrical output: 9 MWe

Net electrical output: 8 MWe

Heat output: 30 MJ/s

Electrical efficiency, gross: 25 %

Electrical efficiency, net: 22 %

Overall efficiency, gross: 108 %

Flue gas condenser: 7 MW

How is plant controlled: By heat demand

Heat backup: 2*15 MW oil

Heat usage: Heating only

Energy usage: 20 000 inhabitants in city of Falun, 260 GWh per year

District heat coverage (% of total demand in DH network): 60 %

DH inlet temperature: 80-105 °C

DH return temperature: 45-60°C

Heat storage size: 8000 m3

Hours of full load that the heat storage can meet: 10

Fuel storage: Two weeks outdoor at  site, 17 000 m3, 70 hours in a silo, 3000 m3

Waste water: Fuel condensate, suspnsion filtred to 10 mg/l and pH 7 with NH3 in flue gas

Ash discharge: 100% recycled, 1000 ton/year, moisture 35%

Plant description:

BFB boiler, 30 MWt and 8 Mwe 100% forest residual, 50% moisture, flue gas condenser 7 MW, which is cooled by district heating water and combustion air. NOx reduction with NH3

Fuel feeding system: Chain scrapers and rotating screws

Turbine: HP- and LP cylinders each with 10 stages connected to a common gear to the 1500 rpm generator

Steam data: 60 bar, 485 deg C

Flue gas cleaning: Nox-reductions with NH3 injection in the furnace

Cooling system: district heating water only

Staff:

The plant is operated unattended during nights and weekend. It is legal to operate the plant 16 hours unattended. 2 persons are available on call one week out of four weeks. 2 persons daytime. Full time employees 9 persons

Electricity sale info: NordPool+ green certificates

Total capital cost: € 18,000,000

Year 1992

Data collected and quality assured by: Swedish Biomass Association.

Contact person: Johan Vinterbäck