Modeling Of Char Combustion In CO_2/O_2 And N_2/O_2 Atmospheres

摘要

The combustion of coal particles suspended in a gas stream is a complex process including devolatilization,gas phase oxidation and solid char combustion. The impact on these processes by oxyfuel atmospheres,which exhibit a very high fraction of carbon dioxide, has been investigated by the Institute ofCombustion and Power Plant Technology (IFK) at the University of Stuttgart. The experiments on thecombustion of chars of Lusatian lignite in N_2/O_2 and CO_2/O_2 atmospheres are used for comparison withCFD-Simulations by Hitachi Power Europe (HPE). The comparison shows that by extension of the existingchar combustion model with the Boudouard reaction the oxygen consumption in the test furnace canbe calculated for most cases quite well.