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Modelling of pulverised coal combustion by a Eulerian-Eulerian two-phase flow formulation

2005; Inderscience Publishers; Volume: 5; Issue: 6 Linguagem: Inglês

10.1504/pcfd.2005.007067

1741-5233

Ali Cemal Benim, Bernd Epple, Bernd Krohmer,

Coal Combustion and Slurry Processing

This paper evaluates a Eulerian-Eulerian modelling of the dispersed two-phase flow in pulverised coal combustion. In contrast to the commonly employed Eulerian-Lagrangian procedures, which treat the gas phase by a Eulerian and the particulate phase by a Lagrangian frame of reference, the presently investigated approach applies a Eulerian description to both phases. In our implementation, the model is further simplified assuming a mechanical and thermal equilibrium between the phases. For validation, two- and three-dimensional furnaces with different thermal loads have been analysed. Results have been compared to those obtained by Eulerian-Lagrangian formulations and measurements. It has been shown that the present Eulerian-Eulerian approach provides a comparable overall accuracy to the Eulerian-Lagrangian formulation, with substantially lower CPU requirements for large-scale utility boilers, and, thus provides an attractive alternative for this bracket of problems.