Experimental investigation of a pulverized coal burning process to validate numerical models

Oxyflame 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

C1 is the central validation project of Oxyflame. The main objective is the detailed measurement of different and defined swirl stabilized pulverized coal flames in air and oxy-fuel atmosphere to gain validation data for numerical models which are developed within other subprojects of the SFB/Transregio Oxyflame project (e.g. the transient simulation of an entire oxy-fuel combustion chamber). The quantities to be measured are the gas flow rates, gas compositions, gas and particle temperatures, gas radiation and OH*- chemiluminescence. During this period the existing combustion chamber and the swirl burner, which was developed during an earlier project at the WSA, are going to be used. High spatial resolution optical laser methods are applied in order to gain detailed knowledge of the flow field. The optical laser methods are developed and provided within another subproject of the SFB/Transregio Oxyflame (Experimental Characterization of the oxy-fuel Pulverized Coal Burners, CSI, TU Darmstadt). For the second period it is planned to use the newly developed or adapted absorption spectroscopic measurement techniques (line -of-sight ) for non - invasive determination of gas temperature and gas composition within the subproject "Diagnostic methods for pulverized coal combustion processes " (CSI, TU Darmstadt). Until these methods are available the established measurement probe techniques are applied. Furthermore the two-color pyrometer, which was developed at the WSA institute, is improved in order to determine temperature data of the individual particles in the pulverized coal flame. Together with the subproject "Spectral modeling of thermal radiation" (EST, TU Darmstadt) a concept for spectral measurements of the heat radiation will be prepared. This concept will be converted during the second period to gain validation data for the developed models to describe the gas radiation during the combustion.