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  • 1.
    Malmberg, Donald
    et al.
    MEFOS, Luleå, Sweden.
    Sandström, Lars
    AltOptronic AB, Gothenburg, Sweden.
    In-Situ Monitoring of Oxygen Concentration and Gas Temperature in a Metallurgical Process Using Diode-Laser Spectroscopy2000Conference paper (Other academic)
    Abstract [en]

    By using a Tunable Diode Laser spectrometer the oxygen concentration and the temperature in the off-gases of an electric arc furnace, EAF, have simultaneously been monitored during operation. The spectrometer operates at a group of absorptoin lines lines in the near infrared wavelength region to measure the oxygen concentration and the temperature. The O2 absotion line parameters used were determined in a controlled pilot experiment using a heated measurement path. The temperature is measured using the relative intensity of the absoption lines and thereafter concentration is calculated from the temperature compensated absorption. The measurements were performed in-situ with a specially designed high temperature sensor mounted on the furnace wall. Optical fibers were used to carry the probing light between the TDL spectrometer and the measurement point. This novel work shows the potential of using TDL spectrometer to measure O2 and temperature in-situ in a steel making process.

  • 2.
    Malmberg, Donald
    et al.
    MEFOS, Luleå, Sweden.
    Sandström, Lars
    AltOptronic AB, Gothenburg, Sweden.
    Nygren, Jan
    AltOptronic AB, Gothenburg, Sweden.
    Sandberg, Christian
    AltOptronic AB, Gothenburg, Sweden.
    In-Situ Monitoring of Oxygen Concentration and Gas Temperature in a Metallurgical Process Using Diode-Laser Spectroscopy: 2001Conference paper (Other academic)
    Abstract [en]

    Increased demands on quality control, reduced production-time, energy savings and reduction of green-house-gas emission in various metallurgical processes have created an interest for new methods to monitor and control the processes. By using Tunable Diode Laser spectrometers the gas temperature as well as the concentration of 0 2, CO and C02 have been monitored. Laboratory experiments were carried out in a specially designed high-temperature furnace at MEFOS to determine a set of absorption lines suitable for simultaneous 02ffemperature and CO/COz measurements. Field trials were carried out in an Electric Arc Furnace and a reheating furnace. 

  • 3.
    Niska, John
    et al.
    MEFOS, Luleå, Sweden.
    Rensgard, Anders
    MEFOS, Luleå, Sweden.
    Malmberg, Donald
    MEFOS, Luleå, Sweden.
    Combustion Control Using An IR Diode Laser2003Conference paper (Other academic)
    Abstract [en]

    Tunable diode laser absorption spectroscopy (TDLAS) is a recent development in process instrumentation. A commercial TDLAS instrument has been tested both in an industrial steel reheating furnace and in a pilot furnace at MEFOS for continuous oxygen analysis of the furnace combustion gases. Automatic control of the air-to-fuel ratio (AFR) was proven using a time-averaged oxygen concentration signal with a TDC2000 furnace controller at MEFOS. The oxygen concentrations measured by the TDLAS instrument compared well with local measurements of the oxygen concentration using a conventional zirconia probe in both furnaces. The diode laser has the advantages of high reliability for average gas concentration measurements in the path of the beam, when compared to point gas analysis with conventional zirconia instrumentation. Reliable gas analysis offers the benefits of improved process control, which for steel reheating furnaces include energy savings, reduced emissions and improved productivity.

  • 4.
    Sandström, Lars
    Department of Microelectronics, Chalmers University of Technology, Gothenburg, Sweden.
    On-line and in situ monitoring of oxygen concentration and gas temperature in a reheating furnace utilizing tunable diode-laser spectroscopy2001In: Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, ISSN 1386-1425, E-ISSN 1873-3557, Vol. 58, no 11, p. 2449-2455Article in journal (Refereed)
    Abstract [en]

    Increased demands on energy savings and quality control in metallurgical processes have created incentives for new methods to monitor and control the process. In this paper we will present a field trial that shows the potential of tunable diode-laser spectroscopy (TDLS) for simultaneous contact free measuring and monitoring of the oxygen concentration as well as the gas temperature in a reheating furnaceduring production. The field trials were carried out at an oil-fueled reheating furnace during 7 weeks of production. The tunable diode-laserspectrometer was measuring in situ across the preheating zone and the soaking zone in the furnace. During the campaign the oxygenconcentration and the gas temperature in the furnace environment were simultaneously monitored and instantaneous variations in these parameters could easily be recorded and subsequently correlated to actual changes in the process. Furthermore, the much shorter response-time of the TDLS technique compared with conventional measurement methods such as thermocouples and extractive gas analyzers was also demonstrated during the trials. The results show the potential for the TDLS technique to be used for energy savings as well as product quality improvements by controlling the burners in the reheating furnace. The results show that it would be possible to control and optimize the oxygenconcentration with TDLS in the control loop of the reheating furnace. © 2002 Elsevier Science B.V. All rights reserved.

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