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MODELLING AND SIMULATION OF COAL COMBUSTION PROCESSES IN UTILITY BOILER FURNACES

Bernd Epple
Energy Systems and Technology, Darmstadt University of Technology, Petersenstr. 30, D-64287 Darmstadt, Germany

Uwe Schnell
Institute of Process Engineering and Power Plant Technology (IVD), University of Stuttgart, Pfaffenwaldring 23, D-70550, Stuttgart, Germany

Sinopsis

The current capabilities of mathematical models for the simulation of coal combustion in utility boiler furnaces are presented. The models are able to predict fluid flow, heat transfer rates (in these cases dominated by radiation), distribution of chemical species and pollutants like nitrogen oxide. The impact of computational fluid dynamics on pollutant reduction measures is demonstrated by three examples, starting with a pilot scale coal combustion test rig with a thermal input of 0.5 MW, followed by the furnace of a 160 MW power plant fired with a combination of hard coal and lignite and terminated with a 490 MW utility boiler furnace with eight pulverized coal swirl burners. The results of all predictions show that the influence of process parameter variation on temperature and nitrogen oxide concentration can be predicted at least to an engineering accuracy. Furthermore, arrangements for an optimized application of NOx reduction processes can be deduced and it can be judged by these prediction results whether a change of parameters is likely to produce lower emissions or not.

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