Title

EXPERIENCE IN RECOVERY OF CHILLED BLAST FURNACES

EXPERIENCE IN RECOVERY OF CHILLED BLAST FURNACES

Authorship

Oudenallen, R.G. van; Callenfels, J.E. van Stein; Geerdes, H.A.M.; Gravemaker, G.J.; Wise–Alexander, J.A.; Spiering, A.A.

Oudenallen, R.G. van

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Callenfels, J.E. van Stein

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Geerdes, H.A.M.

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Gravemaker, G.J.

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Wise–Alexander, J.A.

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Spiering, A.A.

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DOI

10.5151/2594-357x-0061

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Abstract

Over the last seventeen years, thirty–three chilled blast furnaces have been recovered with assistance of Danieli Corus. Of the approximately 600 blast furnaces around the world, per year around five suffer from a chilled hearth. One can imagine that the global recovery experience is limited. However, due to the frequent involvement of Danieli Corus in complex blast furnace process circumstances, recovery expertise is developed continuously. Blast Furnace chills can be classified from minor (connection lost, but sufficient heat in the hearth) to very severe chill (connection los and all liquids in hearth are frozen). Classical recovery methods applied up to moderate chills may be successful in the end, but if not, the starting point for recovery is worsened and this may lead to a severe chill. For furnaces experiencing severe chills, Danieli Corus have developed a special “oxy fuel lance technology”, because classical recovery methods take too long time. Even with moderate chills, the use of oxyfuel lance technology can speed up the recovery process.The measures differ depending on the extent of the chill, and so, early notification is always recommended for the quickest recovery. All recoveries in which Danieli Corus participated, but one, were successful and brought the blast furnaces back to full production within 200 hours.

Over the last seventeen years, thirty–three chilled blast furnaces have been recovered with assistance of Danieli Corus. Of the approximately 600 blast furnaces around the world, per year around five suffer from a chilled hearth. One can imagine that the global recovery experience is limited. However, due to the frequent involvement of Danieli Corus in complex blast furnace process circumstances, recovery expertise is developed continuously. Blast Furnace chills can be classified from minor (connection lost, but sufficient heat in the hearth) to very severe chill (connection los and all liquids in hearth are frozen). Classical recovery methods applied up to moderate chills may be successful in the end, but if not, the starting point for recovery is worsened and this may lead to a severe chill. For furnaces experiencing severe chills, Danieli Corus have developed a special “oxy fuel lance technology”, because classical recovery methods take too long time. Even with moderate chills, the use of oxyfuel lance technology can speed up the recovery process.The measures differ depending on the extent of the chill, and so, early notification is always recommended for the quickest recovery. All recoveries in which Danieli Corus participated, but one, were successful and brought the blast furnaces back to full production within 200 hours.

Keywords

Blast furnace; Recovery; Chil; Chilled hearth; Lancing; Oxy–fuel technology.

Blast furnace; Recovery; Chil; Chilled hearth; Lancing; Oxy–fuel technology.