Type of CHP system: Grate fired boiler

Plant owner: The company is a Residual Waste Thermal Power Station Association.

Commissioned: 1999

Status of plant: Commercial

Contractor details: STEINMÜLLER Gummersbach

Power generation: Steam turbine

2x 29 MW units

2 x 3-stage feed grates per grate path and 5 adjustable primary air zones (zone 2 and 3 water-cooled), mid-stream burning chamber, usable grate area: 2x 36 m²

2 x natural recirculation steam raising units

maximum turbine capacity: 12 MW; own needs: 2,5 MW

steam mass flow in the 2 natural recirculation boilers: 34,7 Mg/h/ 40 bar

Main fuel: MSW

Appr. 140000 t/a

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 58 MW

Gross electrical output: 12 MWe

Heat output: 24 MJ/s

Electrical efficiency, gross: 20,6 %

Electrical efficiency, net: 16 %

Gross-heat capacity by full load: < 28  MJ/s How is plant controlled: The MSW unit is controlled by the steam demand.

Heat usage: Heating and process steam

Energy usage:

2 DH networks a’ 12 MW

company building and process water heating (24 000 MWh/a)

residual material processing and flue gas scrubber (44 000 MWh/a)

DH inlet temperature: 120 °C

DH return temperature: 75°C

Fuel storage: The MSW plant storage facility (bunker) has a capacity of max. 11 000 m³ (6000 t). This corresponds to roughly 300 hours of running at full load.

Ash discharge: The ash is deposited with previous treatment.

Plant description:

In the steam generator the thermal energy from the waste incineration at the grate is converted to high-pressure-steam. The steam generator consists of two identical main process lines inclusive their supply and deposit units. The flue gases of the incineration are treated in the flue gas cleaning system.

Fuel feeding system: Mechanical loading system

Turbine: capacity: 12 MW

Steam data: 39 bar/ 400°C after the boiler

Flue gas cleaning:

Dust removal via fabric filter system

HCL reduction by flue gas scrubber

NOx-reduction via selective catalytic reduction (SCR)

SO2/SO3 reduction also by flue gas scrubber

Staff: Appr. 36 employees allocated on 5 shifts

Electricity sale info:

The German biomass-CHP plants, which feed the generated electricity into public grid, get a fixed amount of allowances per kWh (according capacity and year of commissioning) by legal restrictions – EEG -. This allowances decreases every year  and is guaranteed for 20 years.

Data collected and quality assured by: Institute for Energy and Environment.

Contact person: Janet Witt