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Sökning: WFRF:(Wahlberg J.) > Konferensbidrag

  • Resultat 1-10 av 17
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  • Kasimagwa, Ismail, et al. (författare)
  • Slagline refractory
  • 2008
  • Ingår i: Proceedings for the SCANMET III-3rd International Conference on Process Development in Iron and Steel making. ; , s. 377-384
  • Konferensbidrag (refereegranskat)
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  • Kasimagwa, Ismail, et al. (författare)
  • Slagline refractory
  • 2008
  • Ingår i: Proceedings for the SCANMET III-3rd International Conference on Process Development in Iron and Steel making. ; , s. 377-384
  • Konferensbidrag (refereegranskat)abstract
    • An important part to develop in existing ladle metallurgy processes is the ladle as a reaction vessel. The ladle refractory has several vital functions and must withstand chemical, thermal and mechanical wear for longer ladle cycle times to meet higher steelmaking productivity and lower production costs. Extensive refractory wear can be caused by complex united actions such as refractory manufacturing, ladle metallurgy practice, steel and slag composition. A special exposed area is the refractory slagline. The presented results come from one collaborative project with academic work and industrial trials to identify causes of extensive wear in the slagline. The investigation has been carried out on the slagline MgO-refractories after service. The microscopy characterisation results have then been compared to those from thermodynamic calculations by Thermo-Calc software. It was found that the refractory microstructure at the hot-face had been totally or partly penetrated and reacted by slag. The observed phases were magnesia-alumina spinel, slag, calcium silicates and dispersed metallic iron rich phases. Closer analyses of the slag phase showed the presence of calcium silicates and calcium aluminates and some few Mg-Al spinel phases. Further away from the hot-face towards the cold-face, the microstructure was composed mainly of magnesia, small calcium silicates phases and a carbon rich phase and therefore less affected. The project shows that it is possible to combine the characterisation results from the ostmortem studies of the refractories after service with the thermodynamic calculations so that the information about the corrosion behaviour and the microstructure changes of the refractories at refining conditions can be achieved. Further work to test new refractory materials by industrial trials combined with academic work will be performed.  
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  • Rönnberg, Sarah K., et al. (författare)
  • Harmonic emission before and after changing to LED and CFL - Part I: Laboratory measurements for a domestic customer
  • 2010
  • Ingår i: 14th International Conference on Harmonics and Quality of Power (ICHQP). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents an investigation after the impact on a number of power-quality parameters due to the change from incandescent lamps to energy saving lamps like CFL and LED. The measurements were conducted in a full-scale laboratory model with ordinary household equipment connected, thus simulating an ordinary domestic customer. Incandescent lamps have been replaced in stages by CFL and LED lamps. The CFL's and LED lamps will contribute to an increase in current distortion but the amplitude of the harmonics is quite low so the change of lighting will only have a minor effect on the total current harmonic distortion. It is also shown that the (total) power factor is not a good indicator to compare the impact of different loads on the system.
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  • Resultat 1-10 av 17

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