RWTH Aachen University (Aachen, Germany):

Th. Meier, Scientific researcher
A. H. Kolagar, Scientific researcher
Th. Echterhof, Dr. Eng., Academ. advisor, e-mail: echterhof@iob.rwth-aachen.de
H. Pfeifer, Dr. Eng., Prof., Director of the Institute of Industrial Furnaces Construction and Thermal Processes

Further developments and model enhancements of the described EAF process simulation model and the calculation model of the dedusting system are described within this paper. In particular, the EAF model is improved with a more detailed gas phase simulation, leading to more accurate off gas predictions for further calculations in the dedusting system model. In addition, thermal radiation of the gas phase is included in the total heat transfer module as a consequence of the temperature levels of the gas phase in combination with the present CO, H₂O and CH₄ levels. The simulation results of the EAF gas phase are well corresponding to the measured off-gas data from the EAF. With some further developments on the gas phase temperature simulation, the model will be capable to reproduce the measured off-gas composition and energy output through the off-gas for single heats with slight parameter adaptions. Here, the results of the two calculation cases show the effect of a nearly controlled false air intake for post-combustion in the dedusting system in contrast to an excessive false air intake. In the future it is intended, to predict the potential of a waste heat recovery installation to support decision processes if a steam generation is taken into consideration for process optimization. In addition, the results of the two calculation cases show the effect of a nearly controlled false air intake for post-combustion in the dedusting system in contrast to an excessive false air intake.

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