Type of CHP system: Grate fired boiler

Plant owner:

Saar Energie AG is a fusion of RAG Saarberg, SaarEnergie and SFW with its subsidiary companies SOTEC GmbH and STEAG Contracting GmbH. The company has in total about 1700 employees and a turn over of about half a milliard €. The head office is located in Saarbrücken, Germany.

Commissioned: 2004

Status of plant: Commercial

Contractor details:

Boiler: Bertsch GmbH & Co, Bludenz, AUS

Turbine: Alstom)

Power generation: Steam turbine

Main fuel: Wood chips

Appr. 40000 t/a

Nominal capacities & efficiencies:

Total thermal input, incl. fossil fuels: 21,3 MW

Gross electrical output: 5,5 MWe

Net electrical output: 4 MWe

Heat output: 13 MJ/s

Electrical efficiency, gross: 25,8 %

Electrical efficiency, net: 46,9 %

Overall efficiency, gross: 73 %

Additionally the plant delivers about 5 t process steam per hour.

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 usage: Choose from list

Energy usage:

The plant is an industrial as well as a decentral heat and steam supplier. The facility supplies process steam to a large bakery factory (5 t/h, 8 bar) and heat to a regional special suppose association ( app. 40000 MWh per year).

Fuel storage: The biomass plant storage facility has a capacity of max. 2000 m³. This corresponds to roughly 72 hours full load operation.

Plant description:

Saarberg Fernwärme GmbH (SFW) biomass-fired heating plant at Neufahrn near Munich, Bavaria started its operation at new year 2003/04.

SFW dismantled a waste incineration plant that was in operation until the end of the year 2000 and replaced it with an eco-friendly biomass thermal power plant. The generated heat helps to supply the Neufahrn/Echnig district heating network managed by SFW GmbH since 1975 on behalf of the Local Administration Authority (connected load: 46 MW). The generated elecricity is fed into the public supply grid in compliance with the Law on Renewable Energies (EEG).

Fuel feeding system: Mechanical loading system

Flue gas cleaning:

A bag filter guarantees the lowest possible emission levels at the plants. An additive (absorbent) is added to the crude gas stream (at a temperature of 125 – 170° C) as it leaves a group of tangential cyclones. The purpose of the additive, which consists of a mixture of hydrated lime with hearth furnace coke or activated charcoal, is to filter harmful acidic gases (e.g., HCl, HF, SOx) as well as dioxins, furanes and heavy metals (e.g., Hg Cd, As, etc.). The additive binds the contaminants using the dry sorption process; the carbon in the additive (e.g., 2 – 5 % hearth furnace coke or activated charcoal) ensures the separation of dioxins, furanes and heavy metals.

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 SFW biomass-CHP plant in Neufahrn feeds in the public net approximately 30 000 MWh per year.

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

Contact person: Janet Witt