The Oxyfuel Combustion Test Rig "OCTeR" serves the investigation of oxyfuel processes using coal or natural gas. The maximum thermal output is 300 kW.

Two combustion options are possible:

  • In option 1, three horizontally fired and vertically arranged single burners put out about 100 kWth a piece.
  • In option 2, the combustion occurs through a top-down method, in which the fuel is heated through a single burner from the top side of the combustion chamber.

Each burner can be operated not just with gas or coal dust, but with air, or a mixture of oxygen and re-circulated flue gas in varying states of composition. The supply of coal dust (about 50 mm) to each burner is realized through differential feeders with screw conveyors. Carrier gas consisting of flue gas and oxygen transports the coal to the burner outlet.

After leaving the combustion chamber, the flue gas is cleansed of possibly damaging fly ash residue, cooled down, and - depending on the focus of the research - is dried with a condensator. A partial volume flow is then re-circulated, or conducted back into the burner for temperature moderation.

The wall temperature in the combustion chamber can be regulated through air cooling elements split into 8 segments. This way, heat from the flames can be withdrawn, and directed towards the combustion process. Other operating conditions can also be experimentally approached or changed comparably quickly. Surrounding the chamber, 40 measurement openings make the characterization and examination of the inner processes possible. For this purpose, next to a video system and an electronic flame guard, a suction pyrometer (type IFRF), an infrared camera, and sampling probes are available. The instant analysis of the tested gases provides data on water content, as well as CO-, CO2-, NOx-, NO2-, NO-, and O2-concentrations. Additionally, heat flow probes provide information about convective and radiant heat transfer fractions.

Various components of the facility, as well as the periphery, are addressed by means of a SPS. This way, a centralized control system and the consistent acquisition of data is possible.

Schematic illustration

Technical data:
Combustion output max. 210 kWth
Cooling capacity (wall) max. 300 kWth
Combustion chamber height 4000 mm
Combustion chamber diameter 700 mm

Contact Person: Maximilian Blume, Andreas Baumgartner