SFB/TRR 129 Oxyflame

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Reinhold Kneer

Spokesperson for the SFB

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+49 241 80 95400

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  Logo of the SFB-TRR Copyright: SFB-TRR 129

Development of Methods and Models to Describe the Reaction of Solid Fuels in an Oxy-Fuel Atmosphere

Within the SFB-Transregio Oxyflame, internationally recognized scientists from RWTH Aachen, Ruhr University Bochum, and TU Darmstadt are combining their experience in the fields of homogenous gas combustion and heterogeneous particle combustion. Thus, high- resolution experimental and theoretical methods – developed and successfully applied to the experimental and theoretical investigation of gaseous combustion – will be used to investigate the heterogeneous particle combustion in oxy-fuel atmosphere, a process which implicates a considerable increase in complexity when compared to combustion with air.

Facing this, the SFB/Transregio investigates the fundamentals of solid fuel oxy-fuel combustion in a gaseous atmosphere which consists mainly of carbon dioxide, water, and oxyen. In comparison to air-based combustion, this entirely different furnace atmosphere may influence all transport processes involved, whereby the underlying size scales of the processes range from nanometers (pore diffusion within fuel particles) to typical furnace dimensions (101 – 102 m).

Scale resolution and identification of the dominating transport process mechanisms is achieved via small-scale fundamental generic experiments and laboratory-scale validation experiments. Modeling and model development efforts comprise dynamic molecular scale simulations, turbulence modeling and resolving methods (LES) and full scale resolution methods (DNS) for all relevant scales.

Three Project Areas

The SFB-Transregio Oxyflame is subdivided into three project areas:

Project area A comprises mainly the model development for reaction kinetics of solid fuel particle combustion.

Project area B conducts theoretical investigations on aerodynamic phenomena within a particle cloud, as well as investigations of the changed atmosphere’s influence on combustion. Furthermore, experiments building on each other in a cascaded manner, while increasing the complexity, will provide basic validation data.

System level considerations including all the relevant sub-processes encountered in real furnace configurations are considered in project area C. The central modeling activities of project field C incorporate individual and partial models from the other project fields, whereas the central experimental work provides major validation data.

Furthermore, models for the radiative heat exchange between particles and the gaseous atmosphere are developed and measurements for the radiative properties of particles and walls are undertaken in this project area.

 

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