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Consistent blast furnace operation whilst using low cost raw materials (Consistent BF)
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Consistent blast furnace operation whilst using low cost raw materials (Consistent BF)

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Solutions which enable the extended use of low cost raw materials, but conserve blast furnace operation consistent, will contribute to economical hot metal production. The industrial experience with regard to using nut coke, ferrous fines and injected coals as important low cost raw materials was raised from test campaigns and operational modifications at five blast furnace plants. All plants preferred charging the complete screened nut coke. This was possible without loss of process efficiency in cases of satisfactory coke quality. If high screened nut coke rates were resulting from low coke cold strength, negative effects towards permeability and coke size at tuyere level were found. To avoid decreased permeability during ferrous fines charging, the rate of ferrous fines plus low grade ores shall not exceed 8 % of the burden. To achieve more flexibility in the use of ferrous burden, modified sinter distributions among two ore layers located upon each other were successfully tested. Gas flow was investigated with the tracing method. A laser distance measuring unit was installed at one tuyere and determined raceway depth, raceway shape and coke particles sizes. Basing on scientific evaluations rules were developed to achieve consistent operation. This was supported by the calculation of composite nut and coarse coke size after direct reduction and further new numerical methods. A software system for rules-based operation was installed in the control room and provides advices and warnings for shaft and hearth wear protection, hot metal homogeneity and optimised coal rates. Less frequent rules were provided by traditional documentation.
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ISSN 1831-9424
ISBN 978-92-79-29005-3
DOI 10.2777/32492
Kataloška številka KI-NA-25868-EN-N
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ISSN 1831-9424 ISBN 978-92-79-29005-3 DOI 10.2777/32492 Kataloška številka KI-NA-25868-EN-N
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