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In this work a process model is presented for scrap preheating in a counter current packed bed in a shaft furnace with stepwise postcombustion of the fuel gas and also for scrap melting in a smelting reactor. The thermodynamics of the processes, the microkinetics and macrokinetics of heat and mass transfer in the shaft furnace and in the smelting reactor are calculated. The kinetics of iron oxidation at temperatures above 1300 C in CO(2)/CO and H(2)O/H(2) mixtures were measured with an experimental apparatus . Based on these experiments and data from literature for the lower temperatures, the microkinetics of iron oxidation in the temperature range 600 C to 1450 C were determined and incorporated in the model. The temperature profiles, scrap oxidation and gas compositon in the shaft furnace can be calculated using the model. This simulation of the melting process of scrap in a smelting furnace provides the carbon consumption per ton of scrap as well as the CO formation rate in the melt, and the amount, temperature and composition of the off gas from the smelting reactor which is introduced into the shaft furnace for scrap preheating. The calculation also provides information for estimating the capacity of the smelting furnace.

Additional information

Authors: OETERS F, TU Berlin, Institut für Metallurgie (DE);ZHANG L, TU Berlin, Institut für Metallurgie (DE);YAN C, TU Berlin, Institut für Metallurgie (DE)
Bibliographic Reference: EUR 15514 DE (1996) 61pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6164-9
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