Development of Pig Iron and Molten Slag Level Meter for Blast Furnace

A new the pig iron and molten slag level meter for the blast furnace was developed to realize stable furnace operation. One type of the unstable operation is rise of the pig iron and molten slag level, which causes poor furnace conditions. In the worst case, this can cause serious trouble with a large decrease in production. In this proceeding, the new technique is described, which is measuring the liquid level in a blast furnace using the very low electrical resistance measurement in the lower part of a blast furnace, which contains pig iron and molten slag. The four point contact method was adopted, and a pseudo random signal as a current pattern to improve S/N ratio. This technique makes it possible to detect rise or fall of the liquid level. An online test confi rmed that the level meter could predict deterioration of the furnace condition before other sensors can.

1. Lebed, P.K., L.A. Safi na, T.V. Demidenko, A.Y. Semenko and I.E. Pochekailo, “Evaluation of a blast furnace hearth operations by the trend of EMF,” Steel in the USSR, Vol. 20, Feb. 1990 (in Russian). 2. Lathlean, D., D. Mellor, S. Mitchell and F. Tanzil, “Experience with Hearth Drainage and the infl uence on stable operations at BHP Port Kembla Blast Furnaces,” Proceedings McMaster Symposium on Raceway Control for Optimum Blast Furnace Performance, 1991. 3. Mielenz, O., A. Krüner, H. Köchner, H.P. Ruthner, M. Peters and P. Schmöle, “Advanced monitoring of liquid iron fi lling and dead man position inside the blast furnace,” Metal Plant Technology International, Vol. 30, No. 5, 2007. 4. Yokoyama, H., K. Kunitomo, M. Sugiura and K. Nakamura, “The relationship between slag-metal level at blast furnace and electromotive force,” CAMP-ISIJ, Vol. 17, 2004. 5. Yokoyama, H. and K. Kunitomo, “Measurement of Iron and Slag Level with Electromotive Force in Blast Furnace Hearth,” CAMP-ISIJ, Vol. 18, 2005. 6. Zaimi, S.A., G. Danloy, T. Campos, D. Pomeroy, M. Bennani, R. Perez-Chust, B. Lecacheux and D. Huang, “Blast furnace model development and application in ArcelorMittal Group,” Proceedings of International Symposium Recent Progress on Mathematical Modeling in Ironmaking 2008, ISIJ. 7. Danloy, G., C. Stolz, J. Crahay, P. Dubois and Cokerill Sambre, “Measurement of Iron and Slag Levels in Blast Furnace Hearth,” Ironmaking Conference Proceedings, 1991
Usage Shares
Total Views
19 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage