Aerzener Maschinenfabrik GmbH

Above all, biogas must be efficient


Courtesy of Aerzener Maschinenfabrik GmbH

Herning Bioenergi and Bigadan use blower technology made by AERZEN

In Denmark, AERZEN blowers create the link between biogas plant and dairy plant.

Until 2020 Denmark wants to reduce its gross energy consumption - regardless of the aspired economic growth - by 12% compared with 2006. Another goal: Until 2050 the own power and heat requirements shall exclusively be served by renewable energies, thus, becoming independent from fossil fuels in the long run. The kingdom is right out in front in Europe, with more than 80 biogas plants. In Germany, they are still discussing about “using up” the cultivated silage, whereas, in Denmark the bacteria satisfy their hunger with manure from pigs and cattle. Slaughterhouse waste and fish waste, transported by ships from Norway, is being fermented after pasteurisation in a just recently expanded plant at Herning.650 tons of manure is conveyed daily into four fermentation towers at Herning Bioenergi A/S. These towers with volumes of 2 x 3,500 m³ and 2 x 8,000 m³ produce biogas. The gas consists of 70% methane, the residual is carbon dioxide. Unlike many German biogas plants, in Herning there is no power generation by block-type thermal power stations. The biogas is not separately purified to be fed into the gas grid. Rather, Herning Bioenergi has two big direct customers who belong to Arla Foods, one global, cooperative-owned dairy company counting more than 13,500 dairy farmers from Sweden, Denmark, Germany, Great Britain, Belgium, Luxembourg and the Netherlands.The biogas plant in Herning is connect-ed with the first plant in Naviro via a 21 km long gas piping. From there, another 6 km-piping leads to the production site in Videbæk. Three block-type thermal power stations burn biogas on these two production sites. The electricity generated is used for the base load supply on site just like the heat. All three block-type thermal power stations reach a rating of approx. 3 megawatts with their combined heat and power generation (CHB). The demand of the two milk processing establishments is much higher. “As the base load is high and we have only a small part in it, we can be sure that the biogas is really needed,” explains Olav Hald, Production Manager of the biogas plants in Herning. This delivery certainty forms the basis for a continuous operation with optimum biological processes. “The produced biogas is primarily used up and fossil fuels, such as natural gas, can be procured on production basis,” says Edvin Andersen, Technical Manager of Messrs. Bigadan & Herning Bioenergi.

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