Hot Blast Stoves belong to the most important parts in the Blast Furnace process. Consequently requirementsregarding reliability for the hot blast stove are very high and failures of the stoves lead typically to significantproduction losses of the Blast Furnace itself. Hot blast stoves with a so called dome connection pipe - originaldesign of Krupp Koppers (KK) to overcome the vertical expansion of combustion chamber and checker shaft - areoften facing problems with this dome connection pipe. The design of these stoves comprises two chambers forcombustion and checkers and a connection pipe between the two domes. In order to overcome the differentialthermal 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 biggestdifferential movements this area is known to be critical in regard to hot spots and failures of the bellowsthemselves. 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 paperdescribes the background of dome replacements, some details of the engineering, some details of the work to becarried out on site and shows the positive results after commissioning of stoves, repaired by this method.
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