Improvement of blast furnace process control by combined on-line monitoring of liquid levels in the hearth and tapping flow rates
The objectives of this research were to develop and apply methods and model tools for on-line monitoring of inner hearth conditions in order to improve blast furnace process control and cast house practice by means of objective criteria provided to the operators. TKS/BFI developed suitable methods for on-line control of hot metal and slag flow rates and made them available wihin the runner system at the first of four tapholes of BF 2 of TKS. A theoretical model for spatially resolved prediction of hearth liquid filling levels was developed. Different types of EMF probes were tested at blast furnace B of ACERALIA leading to reliable prediction of changes in the hearth liquid filling level. Smoke and dust prevent a reliable measurement of torpedo ladle filling levels by means of a laser-optical system. Suitable methods to avoid Seebeck effect on EMF measurements were developed by CSM. A new developed blast furnace electrical circuit model was applied for off-line simulation of EMFs. A new optical hot metal flow-rate measurement system and a simplified model for on-line determination of hearth coke bed voidage were developed. Several preliminary operational trials for data-acquisition and storage were carried out at Piombino blast furnace until the withdrawal of LUCCHINI from the project. Advanced on-line monitoring of inner hearth conditions was successfully applied to improve cast house practice at different blast furnaces. Sustainable smoothening of hearth drainage was thereby achieved by the shortening of overlapping tapping times, reduction of tapping speed and prolongation of tapping times.
Bibliographic Reference: EUR 22442 EN (2007), 123 pp. Euro: 25
Availability: Katalogue Number: KI-NA-22442-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 978-92-79-04603-2
Record Number: 200718832 / Last updated on: 2007-02-26
Original language: en
Available languages: en