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

Biomass furnace Biomass gasification Validation market potential Heat

Project ID 03EI5436

PaCoSil - Combustion of regionally available residues for the energetic use of biomass and for the coupled production of biogenic silica for particulate matter precipitation processes


  • 01.07.2021 – 30.06.2024


DBFZ German Biomass Research Centre
Research focus on catalytic emission reduction
Torgauer Straße 116
04347 Leipzig

Prof. Dr. Ingo Hartmann — project leader / project coordinator
Telephone: +49-(0)341 2434 541

Dr. Steffi Formann — direct contact person
Telephone: +49-(0)341 2434 533


03EI5436B - A.P. Bioenergietechnik GmbH

Associated partners

Cooperation partners



Planned results:

  • plant level: procedure, pilot plant, demonstration plant
  • concept level: plant concept
  • data level: method (analytical/process descriptive etc.), test series/-program
  • market level: ready for market technologies, ready for market components, business models
  • publications: scientific paper (ISI, peer-reviewed), position paper (political advice)
  • others: strategies


In the PaCoSil project, research will be conducted on regenerative heat and additionally combined silicon-enriched porous and X-ray amorphous inorganic solids, which can be produced with siliconrich biogenic residues that are regionally available in Germany, in order to make them usable for material use in environmental engineering processes. During the material utilization coupled to the heat-controlled production, siliconrich biogenic byproducts are generated. The economic viability of the project is given in particular by the fact that heat-controlled production can be combined with the material utilization of the incineration residues. The focus of the project is therefore on the energetic use of the feedstock and requires a technical development for the implementation of the process steps. Oat and spelt husks are used as silicon rich regionally available biogenic residues. In previous investigations, a production process for the generation of porous silicon dioxide (SiO2) from silicon rich biogenic residues was developed. The focus was on the use of rice husks. Silicon dioxide is obtained from the biomass by means of a thermal process and an upstream chemical-physical process.


Biogenic SiO2 will be investigated in particulate matter precipitation systems in two applications:

  1. Flue gas cleaning at biomass furnaces for residual and waste materials,
  2. Ambient air purification for hall and process air in production processes.



As project coordinator, the DBFZ is responsible for coordinating the individual research tasks, the scientific development of synergies, component integration, the development of optimization approaches, as well as the organization, implementation, scientific monitoring and evaluation of the test facility and field experiments. The DBFZ will be responsible for developing the design and testing of the bag filter system for gas purification. In addition, the DBFZ will work together with the project partners on a concept for recycling the filter powder with embedded particulate matter. The DBFZ will implement the experimental investigation on application cases of the biogenic silica and test and evaluate their prioritization based on environmental criteria.

A.P. Bioenergietechnik GmbH

At the beginning, the boundary conditions for the entire utilization path are researched and compiled. The main focus is on the properties of the fuels used, oat and spelt husks, and their effects on fuel handling, the combustion process and ash handling. The aim is to achieve a stable automated operating process that complies with the emission values applicable during combustion and at the same time produces a high-quality silica-rich ash that can be used as a precoat material in filter processes.
The combustion properties are tested in practice by means of test stand combustion experiments. Based on this, the heating system will be designed for the husk fuels by installing and modifying the fuel supply system, the combustion air supply system, the ash removal system, the combustion chamber and adapting the heating system control system so that the husks are thermally utilized and silicon rich ash is generated, which can be used on the one hand as a filter material in the exhaust gas cleaning system of a biomass boiler, and on the other hand in a filter for ambient air purification.
The verification of the adaptations is carried out by a long-term test on a field system over two heating periods. The fabric filter system of the plant will be equipped with the ashes as filter material. Between the heating periods, further optimization steps will be carried out so at the end of the project, a heating system will be available that can be operated permanently with regional husk fuels and high-quality ashes will be available for material utilization.



Material-energetic use of biogenic silica from regional agricultural residues

A.P. Bioenergietechnik  GmbH

Practicable thermal utilization of silicon-rich residues and recovery of high-quality incineration residues


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