The harsh operating conditions in a blast furnace call for robust instrumentation that can withstand dust, material compositions and very high temperatures. Level measurement of raw materials such as coal, coke, iron ore and limestone as well as measurement of the contents of the steel pans after the blast furnace has been tapped, is an integral part of the steel making process.

A world-leading level sensor manufacturer that can supply such instrumentation is Vega.

Monitoring the optimal height of the sinter bed

Limestone, coke and various additives, together with iron ore, are necessary for the production of raw iron.  To achieve a better gas exchange in the blast furnace, the iron ore and additives are baked together during the sintering process.

This is where Vega’s non-contact radar sensor for solids, the Vegapuls 68 proves its suitability.  The sensor reliably measures the level without being affected by the high temperatures.  Its application extends from level measurement in the charging bunker of the sinter cooler to height measurement on the sinter cooler and on the sinter belt conveyor. 

To protect the sensor electronics from the high temperatures, the antenna is air-cooled and is mounted separately from the sensor on a bent antenna system.

Monitoring the charging of the blast furnace

Due to the extremely harsh operating conditions in the blast furnace, heavy mechanical plumb line systems were often previously used.  But modern radar sensors like the Vegapuls 68 solve this measurement problem much more efficiently and accurately.  Through the use of several sensors, the surface profile in the blast furnace can be systematically analysed.  Moreover, by mounting the sensor in a suitable slide valve, it can be separated from the process anytime during operation.

Tapping the blast furnace

After the blast furnace has been tapped, the raw iron flows into pan or torpedo cars and is taken to the foundry or to the converter for further processing.  With very high temperatures of over 1400˚C and extreme dust and steam generation, measuring the contents of the steel pans places high demands on the sensors.  This application is ideal for Vega’s non-contact radar level sensor for liquids, the Vegapuls 62. 

This sensor has high measuring rates and precision and the excellent focusing of the radar signals allows measurement to take place during filling, even through the relatively small openings in the torpedo car.  A rinsing air connection makes sure that the antenna system stays clean during the intense shower of sparks and dust generation that occurs during filling.  Under cramped conditions angled antenna extensions allow the sensors to be optimally located and the electronics mounted in protected surroundings.

For more on Vega’s radar sensor technology, contact Vega Instruments SA (Pty) Ltd.

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Issued on behalf of:
Vega Instruments SA (Pty) Ltd.
Contact: John Groom
Tel. +27 11 958 1901
Email: john.groom@za.vega.com