The Dall Energy biomass furnace combines updraft gasification and gas combustion.
Hereby several advantages are achieved: The plant becomes simpler and cheaper, the emissions are reduced and the furnace can regulate between 10-100%.
In the bottom part, the solid fuel is converted into a burnable gas and fine ash. In the top layer, the fuel is dried and pyrolyzed.
The heat for the drying and pyrolysis process is a combination of convective heat from the gasification gases below and radiation heat from the gas combustion part above.
The gas velocity in the bottom part is very low. Consequently, particles remain here and the dust emission of the furnace is very low.
Gas from the bottom part is combusted in the top section. The gas combustion (flow, temperatures, emissions etc) is very stable.
40/100 (in chimney)
500-1000 out of furnace
20-70 out of furnace
100 % Load
Three Dall Energy Furnaces have been installed:
2 MW at Warwick Mills USA.
8 MW at Bogense District Heating.
9 MW at Sønderborg District Heating. Emission test April 2015.
The development and implementation of the plants have been financially suppurted by EUDP and markedsmodningsfonden.
The project was supported by EUDP
Main components sønderborg plant.
From left to rigth: Furnace, Boiler, Quench, Scrubber