Type of CHP system: CFB boiler

Plant owner:

Since 1997, the enterprise is founded by a limited liability company with focus on the planning, implementation, financing, construction and operation of renewable energy systems.

Commissioned: 2003

Status of plant: Commercial

Contractor details:

boiler: Forster Wheeler Oy

generator: LDW

turbine: Alstrom

Power generation: Steam turbine

Main fuel: Wood chips

25000 t/a untreated wood and barke

120000 t/a matured forest (regarding national standard: appr. 10% A1, A2 and appr. 90 % A3, A4)

Nominal capacities & efficiencies:

Total thermal input, incl. fossil fuels: 70 MW  (without back-up boilers)

Gross electrical output: 23 MWe

Net electrical output: 20 MWe

Heat output: 65 MJ/s

Electrical efficiency, gross: 33 %

Electrical efficiency, net: 30 %

Overall efficiency, gross: 57 %

How is plant controlled: The unit is run due to the amount of fuel available and generates electricity to feed into the public grid primarily.

Heat backup: The heat backup system consists of a steam rising unit of Babcock (22 MW).

Heat usage: Process steam

Energy usage:

Steam parameters: 500°C/ 85 bar

The commercial district heating system will come on stream in the middle of 2005. It will supply several green houses, private and commercial consumers. At the moment, the unit supplies heat only to the 400 m² office building of the company (90/70°C).

Fuel storage: The biomass plant storage facility has a capacity of max. 30000 t. This corresponds to roughly 1500 hours or 62,5 days of running at full load.

Ash discharge:

The ash is deposited, partly with previous treatmernt.

Plant description:

The biomass plant in Papenburg is technologically one of the most advanced plants of this kind in Germany. With its 20 MW power generation it is the first new project that went into operation under the EEG (renewable energy law) and the German waste wood ordinance (issued

2002). The biomass plant in Papenburg makes a considerable contribution to remedy the greenhouse effect. Every year 150 000 t of CO2 will be saved from going into the atmosphere by producing energy with Papenburg’s biomass plant.

A 160 000 MWh of power will be generated per year and fed into the grid of EWE. This is sufficient to deliver power to about 50,000 households. Around 130 000 t biomass per year (equivalent to the energy of 50 Mio l fuel oil) is needed to achieve this. The German waste wood ordinance is very strict on this issue and allows only certain types of substances to be used as fuel material.

Fuel feeding system: Mechanical loading system

Turbine: capacity: 20 MV

Steam data: 85 bar, 500°C

in front of the boiler 110 bar/ 200°C

in fron of the turbine 70 bar/ 520°C; behind the turbine 0,1 bar/ 47°C

Flue gas cleaning:

Dust removal via centrifugal force cyclone and fabric filter system

NOx-reduction via fluidised bed combustion and air graiding

SO2/SO3 reduction via multi-cyclone and dry sorption

Staff: Appr. 8760 working hours per year

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.

The biomass-CHP plant in Papenburg feeds in the public net approximately 160 000 MWh per year.

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

Contact person: Janet Witt