Mr. Helmut Urban Profile

Helmut Urban

at JOANNEUM RESEARCH Forschungsgesellschaft mbH

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Proceedings Article | 7 November 2005 Paper

Online temperature measurement and flow analysis of hot dross in a steel plant

Helmut Urban, Oliver Sidla

Proceedings Volume 6000, 600007 (2005) https://doi.org/10.1117/12.630619

KEYWORDS: Temperature metrology, Cameras, Image processing, Liquids, Pyrometry, Electrodes, Calibration, Optical filters, Thermography, Black bodies

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Continuous monitoring and control of process temperature(s) is one of the cornerstones in high quality steel making. Given the very high temperatures in the liquid phase of the steel and the slag on top of the steel (approx. 1500^oC...1800^oC) and the particularly harsh environment at the manufacturing plant, only very few temperature sensors are able to cope with the process requirements, in particular a wide variety of thermocouple probes and pyrometers are commonly used. More recently thermography infrared cameras have begun to enter the scenario but are often discarded as an option mainly because of their high cost. In the high temperature range as described above a dual wavelength camera solution working in the visible part of the spectrum offers a viable alternative¹. At a fraction of the cost such a system can deliver images of high spatial resolution while at the same time measuring temperature with an accuracy of better than 5^oC. The thermal camera approach is particularly beneficial in the present case where important process information can be deducted from quantitative observation of the flow patterns of the molten material which could until now only be estimated by a trained operator with all the drawbacks inherent to such an approach. The thermal camera solution thus offers a clear technological advantage for the steel manufacturer.

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