Copyright: © WSA Picture top: Optical comparison of a pulverized coal flame in air and in oxy-fuel atmosphere; Picture below: LDA-Measurement within an pulverized coal flame

The overall objective of this project is the detailed measurement of different, well-defined swirl-stabilized solid fuel flames in air and oxyfuel atmospheres. Thus, a coherent understanding will be developed, while also detailed experimental data is provided, hence, enabling a sound validation of the numerical models for transient simulation of solid fuel flames developed in partner projects.

Measured quantities include flow velocity with optional simultaneous measurement of particle size, gas composition, gas and particle temperature, gas radiation, and OH* chemiluminescence to determine the location of reaction zones. The investigations will be carried out both on the existing combustion chamber at the WSA employing the swirl burner developed at WSA, and on the 1 MW_th combustion chamber of subproject C7 at TU Darmstadt and where an upscaled version of the WSA swirl-burner will be employed. High spatial resolution laser-optical methods are used for detailed measurement of the flow field.

While in the first two funding periods the focus of the measurements was on pulverized coal flames in the range of 60 kW_th, in the 3rd funding period an extension of both the range of thermal power (up to 180 kW_th) and the fuel spectrum (towards biomass) will take place. At the end of the funding period, measurements will be performed at the 1 MW_th plant to evaluate the scalability - both of the derived mechanisms and of the developed numerical models.