Project meeting of STEP at the site of the company ATS - Agro Trading & Solutions in Hardegsen (Photo: DBFZ)

Biomass furnace

Project ID 03KB043

Torrefaction - Qualification of torrefied biogenic residues for use in large-scale power plants

Woodchips pellets (Photo: DBFZ)


  • 01.09.2010 – 28.02.2014


Technische Universität Darmstadt
Institut Energiesysteme und Energietechnik
Petersenstr. 30
64287 Darmstadt

Prof. Dr.-Ing. Bernd Epple – project manager
Telephone: +49 (0)6151-164717
E-mail: bernd.epple‍@‍

Dr.-Ing. Jochen Ströhle – contact person
Telephone: +49 (0)6151-164791
E-mail: jochen.stroehle‍@‍


Associated partners

Cooperation partners



Results are only available in German.


During Torrefaction, biomass is heated with exclusion from Oxygen to temperatures from c. 200 - 300°C, releasing mainly low-caloric contents and water. By this, the net calorific value is raised and grindability and storage properties of biomass are improved. Pelletization clearly reduces volume and thereby cost of transportation for the biogenic fuel. Consequently, biomass can be used in large-scale power plants with high efficiency. Within this project, the influence of torrefied biomass in combustion processes will be researched in pilot-scale plants and numerical simulation.


Objective of the project is the qualification of torrefied biogenic residues for combustion in large-scale power plants. By co-firing torrefied biomass, electrical efficiency in state-of-the-art power plants can reach up to 45 %.


The focus of research is on combustion properties as ignition, char burn-out and emissions. Further investigations consider avoidance of deposit on mineral compounds and prevention of corrosion on heating surfaces of the plant. After all, the overall process is valued regarding CO2-emissions and economic efficiency.


  • Combustion
  • Biogenic residues
  • Torrefaction
  • Power plant firing


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