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

Biomass furnace

Project ID 03KB009

Mini-ORC - Mini-ORC with emission control-concept for biomass combustion plants up to 1MWth

Test stand - Loaded heat exchanger downstream side (Photo: Fraunhofer Umsicht)


  • 01.03.2009 – 31.08.2011


Fraunhofer Institute for Environmental, Safety, and Energy Technology UMSICHT
Osterfelder Straße 3
46047 Oberhausen

Dr. Wilhelm Althaus – project manager
Telephone: +49 (0) 208 8598-1186
E-mail: wilhelm.althaus‍@‍

Esther Stahl – project coordination
Telephone: +49 (0) 208 8598-1158
E-mail: esther.stahl‍@‍


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Available only in German.


The decentralized use of biomass for combined heat and power (CHP) will become considerably more important by means of new technologies. The major part of available biomass can be used in small local heating networks or in bigger complexes of buildings to generate heat and at the same time electricity in an almost CO2-neutral way without increasing pollutant emissions.


The aim of the project is to develop a concept of a biomass-fired CHP-plant with emission control up to a power range of 1000 kWth. The power generation should be realized by ORC-technology (Organic-Rankine-Cycle). In order to complete the innovative concept it is planned to clean the exhaust gas while at the same time recovering the condensation heat of the ORC-process.


First, a process and security concept is worked out for integrating a mini-ORC-process into biomass combustion appliances. At the same time experiments to investigate the design of the heat transfer areas are carried out. A main task is to examine possibilities to prevent of fouling on the the heat exchanger areas. The concept is rounded off by tests of an of an exhaust gas scrubber integrated into the heating cycle. Finally a design of a pilot plant in cooperation with a supplier of small biomass incinerations is planned.


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