CIRCULAR BIOMASS ENERGY
Energy plant in Rouen, France with Dalkia, or where there is solar heating in the district heating mix like in the Silkeborg, Denmark or Salon de Provence, France projects. The gasification process allows for very low emissions without bag or electro-filters. The Dall energy furnace combines updraft gasification with gas combustion in the same chamber, which results in full performance and environmental benefits without the histor- ical problems related to external combustion. Primary air in- jection is about half of what is used in traditional grate inciner- ation, which results in very low NOx emissions. The gas velocity in the bottom part is very low, so dust emissions out of the oven are between 30-60 mg per Nm3. Also, most of the parti- cles are subsequently removed by a quench bringing the dust levels down to 10 -20 Nm3, thus complying with EU standards without using expensive bag or electro filters. The advantages of Dall Energy gasification technology are recognized not only in Denmark but also in France. The advantages of the technology receive great recognition. Dall Energy recently signed a contract for a 20 MW biomass gasification plant with Silkeborg Forsyning in Denmark and several contracts in France with large energy companies and industrial customers. WITH CITIZENS HEATED BY THEIR GARDEN-PARC WASTE 10,000 tons CO2 reduction per year The Sorø Bioenergy plant converts approximately 30,000 tons garden-parc waste to climate friendly heat and electricity. By utilising garden-parc waste instead of gas 10,000 tons of CO2 is saved per year. This saving is equivalent to each of their customers driving 1.3 times around the earth in a car.
By Ann Bouisset, Cand. Oecon/MBA, General Sales Manager, Dall Energy
Operational for over a year since its inauguration, Sorø Bio- energy converts garden-parc waste from the municipalities into heat and electricity. The 12 MWth biomass plant is a perfect example of using local biomass resources correctly. AffaldPlus, the plant owner, collects the garden-parc waste in 13 waste-receiving depots located throughout the six mu- nicipalities and prepares the garden-parc waste in their bio- mass platform in Næstved, Denmark. Here the garden parc waste passes through a simple two-stage process: it is shred- ded and screened into three fractions, fines for composting, fuel ready for biomass gasification, and oversized, which is put back into the shredder again. Annually 53,000 tons of garden waste is aggregated. Of this, 11,000 tons are used in the gasification process to create heat, and 32,500 tons are composted. Unique patented gasification technology makes it possible. The Dall Energy gasification furnace allows the Sorø Bioenergy plant to use very inhomogeneous biomass, with qualities that vary substantially over the year. The flexibility of mixing a wide range of fuels and with humidity levels from 20-60% makes it possible to use biomass that could previously not be used. The technology also allows for a great load-flexibility, from 100% right down to 10%, without compromising on emissions such as dust, NOx, and CO. This flexibility is crucial, especially for plants operating without accumulation tanks like the Dall
For further information please contact: Ann Bouisset, apb@dallenergy.com
Left: The 12 MWth / 1MWe cogeneration Sorø Bioenergy plant. Middle: The gasification furnace can use a mix of difficult fuels such as garden-parc biomass. Right: The top of the Dall Energy gasification furnace in Sorø
Photos: Steen Knarberg
Made with FlippingBook - Online magazine maker