Monitoring of O2 and temperature in a pelletizing process

Lars G. Sandstroem; Stefan Helge Lundqvist; Torbjoern Andersson

doi:10.1117/12.366456

25 October 1999 Monitoring of O₂ and temperature in a pelletizing process

Lars G. Sandstroem, Stefan Helge Lundqvist, Torbjoern Andersson

Proceedings Volume 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II; (1999) https://doi.org/10.1117/12.366456
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We will show the results from a Tunable Diode Laser (TDL) spectrometer installation monitoring the O₂ concentration and the temperature in an olivine pellet production plant. The spectrometer has been operating continuously for more than two years. In the pelletizing process a reduction of magnetite and sintering takes place at a temperature around 1250 degree(s)C. To achieve a high and predictable quality of the produced pellets the oxygen concentration and the temperature has to be measured in-situ inside the process furnace. A specially designed high temperature sensor was mounted on the furnace wall and an optical fiber was used to carry the probing light from the TDL spectrometer to the measurement point. The TDL spectrometer operates at two absorption lines in the near infrared wavelength region to measure the oxygen concentration and the temperature simultaneously. The temperature is measured using the relative intensity of the two absorption lines and the concentration is calculated from the temperature compensated absorbance. The accuracy of the concentration and temperature measurements at 1 s response time was 0.1 vol.% and 50 degree(s)C, respectively. In order to validate the TDL measurements the pelletizing process furnace temperature was varied between 100 degree(s)C up to 1300 degree(s)C while the oxygen and temperature readings from the TDL spectrometer was recorded. The temperature measurements were also correlated with temperature measurements using thermocouples inside the furnace. The O₂ absorption line parameters were determined in a controlled laboratory experiment using a heated measurement path. This work shows that it is possible to build and field a TDL spectrometer to measure O₂ and temperature in-situ in a steel making process furnace.

Citation Download Citation

Lars G. Sandstroem, Stefan Helge Lundqvist, and Torbjoern Andersson "Monitoring of O₂ and temperature in a pelletizing process", Proc. SPIE 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II, (25 October 1999); https://doi.org/10.1117/12.366456

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KEYWORDS

Temperature metrology

Spectroscopy

Absorption

Oxygen

Infrared radiation

Sensors

Molecules

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