ISSN 2594-357X
36º Seminário de Redução de Minério de Ferro e Matérias-Primas — Vol. 01 , num. 36 (2006)
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In April 2005 Blast furnace No. 2 of ACESITA was rebuilt for what the Upper Hearth, Tuyere zone, Bosh and Belly are concerned. Danieli Corus received an order from ACESITA in November 2003 for the Design and Supply, as well as for Site Assistance, i.e. Installation Supervision, Training, Start-up and Ramp-up of the Production. The Design was finalized in four months time, and the Supplies arrived in Brazil by the End of April 2004, six (6) months after the order date. As of the general market and business situation ACESITA delayed the scheduled reline start from September 2004 to April 2005. The reline lasted 29 days, one day less than projected. As one is aware the Lining and Cooling system of a Blast furnace faces heavy process loadings such as high and fluctuating temperatures, and abrasion and erosion from the descending burden and ascending gases. That is especially true for the Bosh which forms the interface between the lining of the Tuyere zone and the Belly, and thus must provide a smooth process profile to help secure stable operations. The 'Hoogovens' bosh design, comprising plate coolers and highly conductive graphite refractory, has proven to be very robust and able to cope with fierce process conditions and has achieved lifetimes in excess of fifteen (15) years. In fact stabilization of wear is observed after five (5) years of operation, and an almost infinite campaign life can be obtained. Iron and Steelmaking companies around the world have installed so far about forty Boshes of the Danieli Corus design in Blast furnaces ranging in size from 6 to 14 m Hearth diameter. The original Bosh design of the No. 2 Blast Furnaces built in late 2001 included Plate coolers and Silicon carbide refractory. The system experienced problems early in the campaign and these hampered safe operation and influenced negatively the aim of the production level. This interim repair, discussed herein, has allowed upgrading the Bosh and Belly design. Furthermore, the cooling system has been modified to allow the continuous on-line heat flux monitoring, enhancing the potential for improved process control. In redesigning the piping for the cooling system the layout of the piping and troughs was re-arranged to make the cast house floor and furnace surroundings more open and spacey, benefiting the maintenance of the furnace. The project design features and repair methods are presented in this paper.
In April 2005 Blast furnace No. 2 of ACESITA was rebuilt for what the Upper Hearth, Tuyere zone, Bosh and Belly are concerned. Danieli Corus received an order from ACESITA in November 2003 for the Design and Supply, as well as for Site Assistance, i.e. Installation Supervision, Training, Start-up and Ramp-up of the Production. The Design was finalized in four months time, and the Supplies arrived in Brazil by the End of April 2004, six (6) months after the order date. As of the general market and business situation ACESITA delayed the scheduled reline start from September 2004 to April 2005. The reline lasted 29 days, one day less than projected. As one is aware the Lining and Cooling system of a Blast furnace faces heavy process loadings such as high and fluctuating temperatures, and abrasion and erosion from the descending burden and ascending gases. That is especially true for the Bosh which forms the interface between the lining of the Tuyere zone and the Belly, and thus must provide a smooth process profile to help secure stable operations. The 'Hoogovens' bosh design, comprising plate coolers and highly conductive graphite refractory, has proven to be very robust and able to cope with fierce process conditions and has achieved lifetimes in excess of fifteen (15) years. In fact stabilization of wear is observed after five (5) years of operation, and an almost infinite campaign life can be obtained. Iron and Steelmaking companies around the world have installed so far about forty Boshes of the Danieli Corus design in Blast furnaces ranging in size from 6 to 14 m Hearth diameter. The original Bosh design of the No. 2 Blast Furnaces built in late 2001 included Plate coolers and Silicon carbide refractory. The system experienced problems early in the campaign and these hampered safe operation and influenced negatively the aim of the production level. This interim repair, discussed herein, has allowed upgrading the Bosh and Belly design. Furthermore, the cooling system has been modified to allow the continuous on-line heat flux monitoring, enhancing the potential for improved process control. In redesigning the piping for the cooling system the layout of the piping and troughs was re-arranged to make the cast house floor and furnace surroundings more open and spacey, benefiting the maintenance of the furnace. The project design features and repair methods are presented in this paper.
Keywords
Blast furnace, Bosh and Belly, Lining, Refractory, Cooling system
Blast furnace, Bosh and Belly, Lining, Refractory, Cooling system
How to cite
Gravemaker, G.J.; Kaptein, F.; Laar, R.J. van; Corus, Danieli.
ACESITA BLAST FURNACE NO. 2, 2005 REPAIR,
p. 1-11.
In: 36º Seminário de Redução de Minério de Ferro e Matérias-Primas,
São Paulo, Brasil,
2006.
ISSN: 2594-357X, DOI 10.5151/2594-357x-36Red-v1- 01-11
