Model plant and training complex for heat contracting
- developers: Gemeinde Markt Schwaben / E.ON Bayern Wärme GmbH
- Country: Germany
- Fuel types: Wood Product
- Product range: Woodchip systems
- Commissioning: 2007
- Sector: Local authorities
On 4 July 2007, the E.ON biomass heating plant in Markt Schwaben was commissioned. Around 60 residential and office buildings in Markt Schwaben are now supplied with district heating. The Viessmann group provided the biomass boilers from subsidiary Köb plus one Vitomax 300 industrial/commercial boiler. In addition, together with E.ON, the heating plant functions as a model plant and training complex for the utilisation of biomass. In Austria, biomass heating plants for local and district heating are already very common, and a noticeable trend is developing in this direction in Germany as well. During the combustion of biomass, only as much carbon dioxide is released as the plants previously absorbed whilst they were growing, so the heat generated is CO2 neutral. In the late 1990s, the municipality of Markt Schwaben, located east of Munich, decided to back ecological heat production. In 2005, together with the energy supply utility, they opted for a biomass heating plant..
Converting the district heating network to biomass
Construction began in August 2006 and the first heat supply was available in May 2007. The district heating network was thus converted from natural gas to biomass. It is not only the environment that benefits from the project, but also the regional forestry industry, as it supplies the fuel. Located close to the Viessmann sales office in Markt Schwaben, the heating plant was built on an area of approx. 1600 m2 in the commercial and residential area of Burgerfeld. It is situated in a ground-level factory building which is divided into a technical area and a woodchip storage area. Two Köb KPT-1250 biomass boilers were installed, each with 1250 kW rated output, which need to be charged with up to 2700 tonnes of biomass per year from residual forest wood. In addition, a Viessmann Vitomax 300 oil boiler with 1860 kW output serves as a peak load and reserve boiler. The storage area for woodchips can hold around 540 m3 of biomass, which is sufficient for five days' operation at full load. The biomass comes from the region's forests and consists solely of forestry and sawmill residues. The heat generated for central and DHW heating – approx. 7.5 million kilowatt hours a year – covers the demand of the 60 recipients in the district of Burgerfeld through renewables. Several rows of terraced houses, as well as commercial buildings in the adjacent industrial area, are heated. Provision has been made for the future too. The heating plant has been designed in such a way that if Burgerfeld is extended, it will be possible to provide district heating from biomass to additional new buildings.
CO2 reduction of around 1900 tonnes per year
The specially treated district heating water leaves the plant at a temperature of 75 to 90 °C, depending on the prevailing weather conditions. It is then distributed in a sealed circuit along the 2.9 km long pipeline with plastic coating, and returned at a temperature of 55 to 60 °C. The heating plant reduces the emissions of harmful carbon dioxide by around 1900 tonnes a year. The project is subsidised as part of the overall concept by the Technology and Support Centre (TFZ) in Straubing. The heating plant is operated by E.ON Bayern Wärme GmbH, which is also responsible for 24-hour on-call service. The power plant is to act as a model plant for heat contracting. In the future, guided tours and training courses will also take place there.