Ethanol is the most common biofuel in Sweden and worldwide. The extension to Lantmännen Agroetanol’s plant outside Norrköping has been ongoing since 2006,and when it is finished and put into operation later this year, the ethanol plant will become the largest in Sweden. The plant contains not just ventilation solutions from Lindab. The silver metallic roof drainage system is Lindab Rainline.
The production process starts by grinding the wheat into flour, after which it is liquefied using water. Enzymes are then added to this paste, which break the starch in the grain down into a sugar solution - a mash.
Common baker’s yeast is then added and a fermentation process starts, converting the sugar into ethanol and carbon dioxide.
The ethanol is finally separated from the mash, first by distilling it through a mash column and then in a rectifying column. In the very final stage, the remaining water content is separated in a molecular sieve and the finished ethanol is ready for delivery to the oil companies. By drying the alcohol-free mash and making it into pellets, a high-quality animal feed is produced.
“This process creates less pleasant smelling gases.” says Peter Orrö at the consultancy firm Bengt Dahlgren. “There was the need to direct the plant’s ‘odorous gases’ to the central incineration plant where the odorants could be eliminated and carried out through the 80 metre high chimney. This is also the reason why the large 1,600 mm stainless Lindab duct is where it is. Its length of just over 100 m sits on a raised pipe bridge and connects the feed dryer and other buildings to the incineration plant.”