REBUILD OF BLAST FURNACE A AT VOESTALPINE STAHL LINZ GMBH

摘要

In the past few years voestalpine Stahl GmbH in Linz has held a top position among the high-quality flat steel producers. To further strengthen its position in Europe as well as to increase its earning capacity, voestalpine began a long-term investment program entitled 'Linz 2010'. The program focuses, among other targets, on the modernization of the hot metal production. One of the milestones in the course of the first stage was the rebuild of Blast Furnace A in 2004. This pnper gives a review on the major pre-relining activities, the blowdown, rebuild and startup. In 1977, BF A was blown in and the blowdown on July 13, 2004 completed its third consecutive campaign as a 10.5 m, 2454 m~3 w.v. furnace, with a total of 18.9 million tons of hot metal production since the 1994 reline. All the previous campaigns (except the first one without any major intermediate repair) had been determined by advanced wear of carbon blocks in the hearth, finally shaped as the well known "elephant foot"-profile. Relining activities in 1978 (after a break out in the hearth region), in 1985 and 1994 were executed within a four- to six-month downtime. They mainly included the replacement of carbon blocks in the hearth and the lining in the upper stack, of cast iron staves (hearth, tuyere region, bosh, belly and up to the mid shaft), and some minor modifications in the peripheral plant areas as well as regular revamping activities.