EP 2440872 B1 20130320 - METHOD FOR OPERATING A BOTTOM PURGING SYSTEM OF A BOF CONVERTER
Title (en)
METHOD FOR OPERATING A BOTTOM PURGING SYSTEM OF A BOF CONVERTER
Title (de)
VERFAHREN ZUM BETREIBEN EINES BODENSPÜLSYSTEMS EINES BOF-KONVERTERS
Title (fr)
PROCÉDÉ D'UTILISATION D'UN SYSTÈME DE NETTOYAGE DU FOND D'UN CONVERTISSEUR BOF
Publication
Application
Priority
- EP 2010003411 W 20100608
- DE 102009024859 A 20090609
- DE 102010020179 A 20100511
Abstract (en)
[origin: WO2010142407A1] The invention relates to a method for operating a bottom purging system (100) of a BOF converter, said system having, in a distributed arrangement, a plurality of annular slot nozzles (11) consisting of a central pipe (2) and an outer pipe (7), with inert gas injection for decarburizing the melt in the converter. The aim of invention is to provide a method that considerably improves the durability of the nozzles and of the purging sink or block and thus raises the number of smelting cycles in the converter. This is achieved in that, via the central pipe (2), the inert gas (3) is at least intermittently injected together with hydrocarbon and jointly with a jacket gas (9) that is fed through the gap (8) between the central pipe and the outer pipe and that reacts with the inert gas or the gas mixture from the central pipe (2), wherein the jacket gas is split upon meeting the liquid steel, and a mushroom-shaped porous steel jacket (10) that circularly encloses the annular slot nozzles (11) is formed.
IPC 8 full level
F27D 3/16 (2006.01); C21C 5/34 (2006.01); C21C 5/48 (2006.01); F27D 1/16 (2006.01)
CPC (source: EP)
C21C 5/34 (2013.01); C21C 5/48 (2013.01); F27D 1/1684 (2013.01); F27D 3/16 (2013.01); F27D 2003/164 (2013.01); F27D 2003/165 (2013.01); F27D 2003/166 (2013.01); F27D 2003/167 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010142407 A1 20101216; DE 102010020179 A1 20101216; EP 2440872 A1 20120418; EP 2440872 B1 20130320
DOCDB simple family (application)
EP 2010003411 W 20100608; DE 102010020179 A 20100511; EP 10723541 A 20100608