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The objective of the project was to prepare, adapt and apply the FTIR technique in EAF conditions in order to enable detection and monitoring of post-combustion inside the furnace in steel plant.
The feasibility of the FTIR spectroscopy for the high-temperature gas measurement was tested for this temperature range, in principle, at the Physics Department, Reading University, UK. The FTIR spectroscopy system was then tested at an experimental set-up at IEHK. Exhaust gas was determined; the FTIR spectrometer has shown its feasibility in a hostile environment similar to the EAF conditions in industry. Amounts of CO and CO(2), as well as temperature, were monitored closely online and determined and the data have been used in order to understand and to model furnace off-gas composition.
Industrial tests took place at Stahlwerk Thuringen. The measurements gave spectra of CO(2) and CO. From these spectra, composition and temperature of the exhaust gas can be calculated.
The results were compared with data of a common measuring method based on sampling conducted by Messer Griesheim.
Both measurement methods were discussed and evaluated. Absolute values of the carbon monoxide and carbon dioxidecontent of the off-gas were not comparable because of limited compatibility of both methods through different measuring volumes. FTIR spectroscopy takes the average of the whole off-gas volume streaming through the gas line; methods based on sampling analysis use only small volumes. But both methods have shown the same tendencies.
The project has shown the feasibility of FTIR spectroscopy for the detection of hot EAF exhaust gas.

Additional information

Authors: GUDENAU H W, RWTH, Aachen (DE);MAVROMMATIS K, RWTH, Aachen (DE);JANNASCH O, RWTH, Aachen (DE);LETTINGTON A H, University of Reading, Reading (GB);HILTON M, University of Reading, Reading (GB);WELCH M, University of Reading, Reading (GB);WOLFRAM J, Stahlwerk Thuringen, Unterwellenborn (DE);KODER J, Messer Griesheim, Krefeld (DE)
Bibliographic Reference: EUR 21138 EN (2004), 78 pp. Euro: 15
Availability: EUR-OP reference: KI-NA-21138-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-8109-9
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