M.Sc. Henrik Schneider

Contact

work +49 6151 16-28754
fax 28900

Work L1|08 113
Otto-Berndt-Str. 3
64287 Darmstadt

Motivation

The reduction of carbon dioxide emissions is a challenging task in the energy industry. For the safe supply of energy and electrical power in the next decades conventional power plants are necessary. To reduce the greenhouse gas emissions nevertheless, CO2 can be captured and stored (CCS). The most promising technology to separate CO2 is oxyfuel combustion. Instead of using air in the combustion process, a mixture of oxygen and recirculated flue gas is used. This leads to a CO2-rich flue gas and allows efficient CO2 separation. The replacement of nitrogen by CO2 and H2O results in a different combustions behavior. Different temperature and velocity profiles as well as combustion instabilities can be observed. For a detailed understanding of the chemical and physical processes the SFB/Transregio 129 Oxyflame (www.oxyflame.de), which is supported by the German Research Foundation (DFG) (www.dfg.de), was set up in 2013. It’s vision is to develop methods and models to achieve "predictive engineering" as a design tool for the engineering of burners and boilers with oxyfuel combustion.

Method

To achieve a more detailed understanding of the oxyfuel combustion process a 40 kW gas-assisted combustion chamber for coal and biomass is operated. Quarl and combustion chamber are made out of quartz glass to provide an excellent optical access. The combustion characteristics are observed by laser-optical measurement techniques such as Particle Image Velocimetry (PIV), Particle Tracking Velocimetry (PTV), Stereoscopic Particle Image Velocimetry (SPIV), OH Planar Laser Induced Fluorescence (OH-PLIF) or Imaging Pyrometry.

Picture: RSM
Fig. 1 Left: Design of combustion chamber. Right: Burner assembly with quarl [1].
Picture: RSM
Fig. 2 Left: Gas flame. Right: Gas-assisted coal combustion.
[1] Becker, L. G., Kosaka, H., Böhm, B., Doost, S., Knappstein, R., Habermehl, M., Kneer, R., Janicka, J., Dreizler, A., Experimental investigation of flame stabilization inside the quarl of an oxyfuel swirl burner, Fuel (2016).