Title

DOME REPAIR OF EXTERNAL COMBUSTION CHAMBER HOT BLAST STOVES

DOME REPAIR OF EXTERNAL COMBUSTION CHAMBER HOT BLAST STOVES

Authorship

Gantenberg, Martin; Schaub, Eric; Allmannsdörfer, Ralf; Klima., Alexander

Gantenberg, Martin

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Schaub, Eric

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Allmannsdörfer, Ralf

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Klima., Alexander

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DOI

10.5151/2594-357X-22426

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Abstract

Hot Blast Stoves belong to the most important parts in the Blast Furnace process. Consequently requirements regarding reliability for the hot blast stove are very high and failures of the stoves lead typically to significant production losses of the Blast Furnace itself. Hot blast stoves with a so called dome connection pipe - original design of Krupp Koppers (KK) to overcome the vertical expansion of combustion chamber and checker shaft - are often facing problems with this dome connection pipe. The design of these stoves comprises two chambers for combustion and checkers and a connection pipe between the two domes. In order to overcome the differential thermal movement between the two chambers the dome connection pipe is equipped with two expansion bellows. Due to the weakness of these expansion bellows and their position in the area of highest temperatures and biggest differential movements this area is known to be critical in regard to hot spots and failures of the bellows themselves. In order to increase the reliability of such stoves Paul Wurth Refractory & Engineering GmbH (PWR&E) developed a system to replace these domes by the proven Paul Wurth dome design. This paper describes the background of dome replacements, some details of the engineering, some details of the work to be carried out on site and shows the positive results after commissioning of stoves, repaired by this method.

Hot Blast Stoves belong to the most important parts in the Blast Furnace process. Consequently requirements regarding reliability for the hot blast stove are very high and failures of the stoves lead typically to significant production losses of the Blast Furnace itself. Hot blast stoves with a so called dome connection pipe - original design of Krupp Koppers (KK) to overcome the vertical expansion of combustion chamber and checker shaft - are often facing problems with this dome connection pipe. The design of these stoves comprises two chambers for combustion and checkers and a connection pipe between the two domes. In order to overcome the differential thermal movement between the two chambers the dome connection pipe is equipped with two expansion bellows. Due to the weakness of these expansion bellows and their position in the area of highest temperatures and biggest differential movements this area is known to be critical in regard to hot spots and failures of the bellows themselves. In order to increase the reliability of such stoves Paul Wurth Refractory & Engineering GmbH (PWR&E) developed a system to replace these domes by the proven Paul Wurth dome design. This paper describes the background of dome replacements, some details of the engineering, some details of the work to be carried out on site and shows the positive results after commissioning of stoves, repaired by this method.

Keywords

Hot blast stoves; Stove refractory design; Stove repair.

Hot blast stoves; Stove refractory design; Stove repair.