Determination of porous plug wear in a combined blowing converter
Project ID: 7210-CB/404Funded under: ECSC-STEELRES 7C
The aim of this research was to establish a prototype measurement system for determination of the wear on porous plugs used in combined blowing converters. The CSM originally proposed that investigations be focussed on a system based on measurement of the variation in the electrical resistance detected by electrodes inserted in the refractory as plug length varies. However, the trials with the liquid steel baths revealed the critical nature of the electrode-steel contacts, and as the entire working hypothesis hinged around the short-circuiting of the electrodes through the steel bath, it was decided to investigate the possibilities of alternative methods. One of these involved the use of an ultrasonic probe applied to the end of a steel bar inserted into the porous plug, while another hinged around measurement of the temperature profile of the plug by means of thermocouples. Experimental tests with the ultrasonic method in an induction furnace capable of melting about 300kg of steel demonstrated the possibility of using 2.25 MHz probes coupled to a steel bar having a minimum diameter of 30mm. However, because of the major plant problems to be resolved, it was decided to experiment with the temperature profile method. A one-dimensional mathematical model was therefore developed. This dealt with the problem of non-constant heat transmission through the refractory forming the porous plug, and revealed the main factors which influence heat distribution within the block. A trial arranged on a converter at ILVA's Taranto Steelworks gave interesting information on temperature trends in the bottom of the converter during the first hours after start-up.
Bibliographic Reference: EUR 12721 IT (1990) 80 pp., FS, ECU 8.75
ISBN: ISBN 92-826-1397-6
Record Number: 199011056 / Last updated on: 1994-12-01
Original language: it
Available languages: it