Type of CHP system: Grate fired boiler

Plant owner: NUON

Commissioned: (reconstructed):1999 (2000)

Status of plant: Commercial

Contractor details:

The construction period was delayed for 1.5 year due to bankrupcy of the main contractors. The installation was completed by own management.

Power generation: Steam turbine

Main fuel: Wood chips

The plant will consume 15,000 – 25,000 ton clean waste wood per year with 45% moisture. There are no facilities for any fuel preparation or pretreatment, and is also not allowed.

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 8 MW

Total thermal input, incl. fossil fuels: 8 MW

Gross electrical output: 1,7 MWe

Net electrical output: 1,5 MWe

Heat output: 6,5 MJ/s

Electrical efficiency, gross: 20 %

Electrical efficiency, net: 20 %

Overall efficiency, gross: 85 %

Power to heat ratio: 0,25

How is plant controlled:

By heat demand during winter

By E-demand during summer

Heat backup: Natural gas boiler of 13 MWt

Heat usage: Heating only

Energy usage: 3,000 households

District heat coverage (% of total demand in DH network): 100 %

DH inlet temperature: 95 °C

DH return temperature: 55°C

Heat storage size: Volume of the district heating system m3

Hours of full load that the heat storage can meet: n.a.

Fuel storage:

Wood chips are transported to the site by trucks and dumped into a cellar provided with a walking floor. From here the fuel is transported to the combustor by means of a conveyor. The fuel storage volume is enough for three days operation.

Waste water: Cleaning before disposal to pubic sewage system

Ash discharge: Road construction material

Plant description: Grate fired boiler with steam tubine for clean wood residues

Emission regulation by province

Fuel feeding system: With conveyor to bunker with 3 days storage capacity

Boiler: 2-track heat-pipe boiler

Turbine: High and low pressure turbine, manufactured by KKK

Steam data:

Steam pressure 32 bar,

steam temperature 400 oC,

Steam production 8,5 t/hr

Flue gas cleaning: The flue gas cleaning consist of two multi-cyclones and a electrostatic precipitator.

Cooling system: Cooling tower

Low pressure turbine is only used in Summer

Staff: 1,5

Electricity sale info: Fixed

Total capital cost: € 12,000,000

Data collected and quality assured by: Biomass Technology Group BV.

Contact person: Harrie Knoef