Type of CHP system: CFB boiler

Plant owner: Owned by Nässjö Affärsverk AB which in turn is owned by Nässjö Municipality

Commissioned: 1990

Status of plant: Commercial

Contractor details: Boiler deivered by Kvaerner Power AB. Generator and  turbine delivered by Asea Stal AB (ALSTOM)

Power generation: Steam turbine

Steam pressure: 8,0 Bar, temperature:490 C steam production 43 tons/Hr. Flue gas condensation: 6 MW.

Main fuel: Wood chips

70% of forest residual and 30 % byproducts from sawmills

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 33 MW

Total thermal input, incl. fossil fuels: 33 MW

Gross electrical output: 9 MWe

Net electrical output: 7,5 MWe

Heat output: 27 MJ/s

Electrical efficiency, gross: 27 %

Electrical efficiency, net: 23 %

Overall efficiency, gross: 91 %

Flue gas condenser on 6 MW

How is plant controlled: The plant is controlled by the heat demand.

Heat backup: Back-up boilers: One oil boiler on 20 MW , Two oil boiler on 5,8 MW and one electrical boiler on 4 MW

Heat usage: Heating only

Energy usage:

Energy consumers in Nässjö is industries, multi dwelling houses and one dwelling houses. It is about 1000 costumers. The production of power from the plant is about 25 % of the consumption in the village of Nässjö.

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

DH inlet temperature: 70-110 °C

DH return temperature: 40-50°C

Heat storage size: 3000 m3

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

Fuel storage: 4 500 m3 of biomass. The fuel storage is enough for 4 days of operation at full load.

Waste water: 26 000 m3 from the flue gas condensation. Ph 7-10.

Ash discharge: Recycling to the forest

Plant description:

The first powerplant in a small scale in Sweden. The plant produce both heat and electricity, 26 MW heat for the heating grid in city of Nässjö and 9 MW electricity. The boiler is manufactured for coal, wood chips and peat.

Fuel feeding system: Screws and conveyors

Boiler: CFB, 30 MW efficiency

Turbine: TGB 8, 9 MW efficiency

Steam data: 80 Bar, 490 degree Celcius, 43 tons/hr

Flue gas cleaning: Electrostatic precipitator for dust particles

Cooling system: Heating grid

78 Bar, 490* C

Staff:

13 employees at the plant. 2 employees are needed to operate the plant during day, (8 hours per shift). At night is nobody at the plant.  An alarm system is installed. If anything occur employees will be at the plant within 30 minutes

Electricity sale info: The price on electricity depends on the price at Nordpool

Data collected and quality assured by: Swedish Biomass Association.

Contact person: Johan Vinterbäck