Title

New hearth lining direction at Salzgitter Flachstahl blast furnace B

New hearth lining direction at Salzgitter Flachstahl blast furnace B

Authorship

PETHKE, JÜRGEN; STIŠOVIĆ, TATJANA; SYLVÉN, PETER

PETHKE, JÜRGEN

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STIŠOVIĆ, TATJANA

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SYLVÉN, PETER

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DOI

10.5151/2594-357x-35Red - 03-12

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Abstract

In May 2004, Salzgitter Flachstahl in Germany rebuilt blast furnace B. This is a modern furnace with a hearth diameter of 11.2 m and a working volume of 2,530 m³. This paper describes one of the major changes that was made, namely to replace the existing conventional carbon block hearth lining with a so-called freeze lining made in USA. The ambition is to accomplish a very long and trouble-free campaign, similar to what is recorded at many other leading iron makers utilizing this concept and unique materials. A general presentation is made of the three operating blast furnaces in Salzgitter; A, B and C. This is followed by more detailed information concerning furnace B. The refractory lining concept and materials installed are described. The excavation of the remains of the old lining and the installation of the new lining were documented with numerous photographs of which some of the most interesting are part of this paper. A high number of double thermocouples were installed at different furnace elevations in the refractory hearth wall and bottom. Their locations are shown together with the temperature readings for the first six months of operation. The results are very convincing and promising for the future, showing very low, stable and consistent temperatures at all critical sections of blast furnace B.

In May 2004, Salzgitter Flachstahl in Germany rebuilt blast furnace B. This is a modern furnace with a hearth diameter of 11.2 m and a working volume of 2,530 m³. This paper describes one of the major changes that was made, namely to replace the existing conventional carbon block hearth lining with a so-called freeze lining made in USA. The ambition is to accomplish a very long and trouble-free campaign, similar to what is recorded at many other leading iron makers utilizing this concept and unique materials. A general presentation is made of the three operating blast furnaces in Salzgitter; A, B and C. This is followed by more detailed information concerning furnace B. The refractory lining concept and materials installed are described. The excavation of the remains of the old lining and the installation of the new lining were documented with numerous photographs of which some of the most interesting are part of this paper. A high number of double thermocouples were installed at different furnace elevations in the refractory hearth wall and bottom. Their locations are shown together with the temperature readings for the first six months of operation. The results are very convincing and promising for the future, showing very low, stable and consistent temperatures at all critical sections of blast furnace B.

Keywords

Blast furnace, Hearth lining, Refractory lining, Freeze lining, Thermocouples

Blast furnace, Hearth lining, Refractory lining, Freeze lining, Thermocouples