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In recent years, major improvements in blast furnace campaign life have been achieved. At least seven Japanese blast furnaces, and a few others around the world, have now surpassed a life of 15 years, with the majority still operating. A new world record campaign life of 20.75 years was set in March 1998 by Chiba No 6 BF, producing 60.23 Mt.

The basis of very long campaigns is good design and equipment, coupled with comprehensive monitoring and continuous, smooth operation, at a reasonable productivity. Furnaces recently rebuilt have benefited from the development of campaign life extension technology over the last 15 years, with many operators now aiming for a campaign life of 15 to 20 years. However, the objective of maximum campaign life may not necessarily coincide with maximum profitability, and the strategy will depend on the individual works circumstances.

To extend the life of existing furnaces, and prolong the life of furnaces that have been rebuilt without the facilities for a very long life, or those that operate at high productivity, repair techniques play an important role. Engineering techniques, planning and speed of execution of repairs and rebuilds have improved markedly in recent years. The hearth, particularly the taphole region, remains the critical part of the blast furnace in the achievement of long campaign life, although successful repairs have been demonstrated in relatively short outages.

In this study, blast furnace campaign life extension techniques, highlighted in an earlier study, were investigated in more detail. tail.

Additional information

Authors: JAMESON D, British Steel, Middlesbrough (UK);LUNGEN H-B, VDEh, Dusseldorf (DE)
Bibliographic Reference: EUR 19970 EN (2001), pp. 118. Euro: 17.50
Availability: Available from EUR-OP sales agent URL:
ISBN: ISBN 92-894-1567-3
Record Number: 200113988 / Last updated on: 2001-11-14
Original language: en
Available languages: en
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