District heating in Rottne
The plant in Rottne has been completely fossil fuel free since 2012, when the Eo1 oil was replaced with biodiesel (RME). This means that all of the fuel used here is renewable.
About 180 customers get their heat from the plant, with the largest customer being Vidingehem. The network encompasses 10,383 metres of piping with a total volume of 64 cubic metres.
The plant was commissioned in 1998 and was fitted with a JF Integral boiler with an output of 1.5 MW for dry wood fuel together with a VEÅ oil-fired boiler with an output of 3 MW. In 2004, the plant received a major overhaul and was expanded in conjunction with the replacement of the old fuel feeding system. The plant was supplemented with a second JF Integral boiler with an output of 1.5 MW, and the old JF boiler was converted for firing with damper wood fuel. This reduced its output to 1.2 MW.
Both biofuel-fired boilers are operational during the winter, although one is enough to meet demand during the summer. Multi-cyclones are used to treat the flue gases from the biofuel-fired boilers. The plant also has a backup generator to maintain the heating supply in the event of a power outage.
The plant produces about 12.5 GWh/year, replacing about 1,300 cubic metres of heating oil with biofuel. The raw material is comprised of 100% renewable biofuel from the forest, such as branches, treetops and other residues from the forests of Småland.