Type of CHP system: Grate fired boiler

Plant owner: Houtindustrie Schijndel BV

Commissioned: 1997

Status of plant: Commercial

Contractor details: Vyncke, Belgium

Power generation: Steam turbine

After 6,5 yrs operation with 46000 accumalated hours the plant is still using the first grate and condensor.
After 10 years operation a major overhaul is planned.

Main fuel: Wood chips

Fuel consist of shavings and saswdust from the own woodprocessing factory

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 6 MW

Total thermal input, incl. fossil fuels: 6 MW

Gross electrical output: 1,25 MWe

Net electrical output: 1,05 MWe

Heat output: 0,9 MJ/s

Electrical efficiency, gross: 18 %

Electrical efficiency, net: 15 %

Overall efficiency, gross: 90 %

Power to heat ratio: 0,5

Availability 8000 hours (91%)

How is plant controlled: By constant oxygen concentration in the combustion chamber of about 9 vol%

Heat usage: Heating only

Energy usage: Heat is used for drying and space heating. Combustion air is pre-heated by the low-pressure steam.

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

DH inlet temperature: 100 °C

DH return temperature: 90°C

Fuel storage: Wood storage in four silo’s, approx. 1500 m3 for five days

Dosing silo

Waste water: No waste water is generated

Ash discharge: Automatic, recyling

Plant description:

Moving water-cooled grate combustion plant.

The moving step grate and the walls of the combustion chamber are kept at 110 oC to control the expansion of the grate

The plant must fulfil the NER emission standard

Heat production is not measured

Fuel feeding system: Dosing silo and three worms

Boiler: Inclined moving grate boiler

Turbine: Vacuum condensing, 5 step turbine

Steam data: 28 bar, 420 0C, 7.5 t/hr

Before turbine 420 degr/28 bar and after 50 degr/0,15 bar

Flue gas cleaning: Electrostatic precipitator

Cooling system: Cooling tower

Steam of 60 °C is cooled

Staff: zero

Electricity sale info: Fixed

Total capital cost: € 3,000,000

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

Contact person: Harrie Knoef