BIOS - Bioenergy

Development of pellet combustion technologies

BIOS has a long lasting an in-depth expertise in the development and optimisation of pellet combustion technologies (Development of technologa). Pellet furnaces have successfully been developed or optimised (CFD-aided (CFD)) for several furnace manufacturers in all for Austria relevant size ranges:

  • Pellet stoves with nominal capacities < 10 kW
  • Pellet central heating furnaces with nominal capacities between 10 and 100 kW
  • Medium-sized pellet furnaces (e.g. for the application in micro-grids or process heat supply) with nominal capacities of up to 150 kW

Respective developments and optimisations have already been performed for well-known pellet furnace manufacturers, thereunder KWB, Viessmann, Windhager and Guntamatic.

A good example for a successful pellet furnace development is a 150 kW pellet furnace, which has been developed within a collaborative project between KWB Kraft und Wärme aus Biomasse GmbH and BIOS and which has been awarded with the “Energiegenie 2004” price from the Austrian Ministry of Environment and the Energy Agency of Upper Austria.

CFD-gestützte Entwicklung von Biomassefeuerungen im kleinen Leistungsbereich – PDF#0050

Scharler Robert *, Obernberger Ingwald *, WEISSINGER Alexander **, SCHMIDT Wilhelm **

*BIOS BIOENERGIESYSTEME GmbH, Inffeldgasse 21b, A-8010 Graz, Austria
**KWB – KRAFT & WÄRME AUS BIOMASSE GmbH, Industriestrasse 235, A-8321 St. Margarethen/Raab, Austria

Sectional view KWB TDS Powerfire 150 (Source: KWB Kraft und Wärme aus Biomasse GmbH)...
... and isosurface of flue gas velocity [m/s] in vertical cross-sections of the furnace

The aim of in the development and optimisation of pellet furnaces is on the achievement of high efficiencies at low emissions (especially PM, CO, OGC and NOx) as well as on high plant availabilities. Several constructional measures and control strategies are available to achieve these development and optimisation targets, where BIOS has long lasting experience not only for small-scale but also for medium and large-scale biomass furnaces (0.5 to 30 MW).
Moreover, additivation of pellets can also be investigated and evaluated, where intelligent raw material blending can be applied to benefit from or to avoid advantages or disadvantages of different elements or element combinations (the ash melting behaviour can be influenced by that for instance).
Furthermore, pellet furnaces specially designed for “new” biomass fuels such as straw or miscanthus are also under development.