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  • 1.
    Andersson, Bengt-Åke
    et al.
    University of Borås, School of Engineering.
    Johansson, Andreas
    University of Borås, School of Engineering.
    Förbränning och termiska system för hållbar utveckling2009In: Vetenskap för profession, ISSN 1654-6520, no 10, p. 79-81Article in journal (Other academic)
  • 2.
    Björk, Hans
    et al.
    University of Borås, School of Engineering.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    Ericsson, Dag
    University of Borås, School of Engineering.
    Sarv, Hans
    University of Borås, School of Engineering.
    Bolton, Kim
    University of Borås, School of Engineering.
    Börjesson, Anders
    University of Borås, School of Engineering.
    Bazooyar, Faranak
    University of Borås, School of Engineering.
    Ahlström, Peter
    University of Borås, School of Engineering.
    Taherzadeh, Mohammad
    University of Borås, School of Engineering.
    Andersson, Bengt-Åke
    University of Borås, School of Engineering.
    Johansson, Andreas
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    20 år med Institutionen Ingenjörshögskolan: historik, nuläge och framtid2009Report (Other academic)
  • 3.
    Johansson, Andreas
    University of Borås, School of Engineering.
    Siktning av avfall2008Other (Other academic)
  • 4.
    Johansson, Andreas
    University of Borås, School of Engineering.
    Waste refinery -joint initiatives towards improved energy recovery from waste2008In: Proceedings of World Bioenergy, conference & Exhibition on Biomass for Energy, oral sessions., 2008, p. 45-49Conference paper (Other academic)
  • 5.
    Johansson, Andreas
    et al.
    University of Borås, School of Engineering.
    Blomqvist, Evalena
    Ekvall, Annika
    Gustavsson, Lennart
    Tullin, Claes
    Andersson, Bengt-Åke
    University of Borås, School of Engineering.
    Bisaillon, Mattias
    Jarlsvik, Tisse
    Assarsson, Anders
    Peters, Gunnar
    Report: Waste Refinery in the Municipality of Borås2007In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 25, no 3, p. 296-300Article in journal (Refereed)
  • 6.
    Johansson, Andreas
    et al.
    University of Borås, School of Engineering.
    Eskilsson, David
    Johansson, Linda
    Wikström-Blomqvist, Evalena
    Andersson, Bengt-Åke
    University of Borås, School of Engineering.
    Johnsson, Anders
    Combustion of Demanding Waste Fractions in a 10 MWe Waste-toEnergy Plant2007In: In Proceeding of ISWA/NVRD World Congress 2007, 2007Conference paper (Other academic)
  • 7.
    Johansson, Andreas
    et al.
    University of Borås, School of Engineering.
    Johnsson, Filip
    Leckner, Bo
    Solids back-mixing in CFB boiler2007In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 62, no 1-2, p. 561-573Article in journal (Refereed)
    Abstract [en]

    The furnaces of circulating fluidized bed (CFB) boilers have substantially lower height-to-width ratios than most of the laboratory CFB risers from which experimental investigations on riser fluid dynamics are published. Therefore, it is uncertain whether literature expressions for prediction of the distribution of solids and the thickness of the wall layers, derived from investigations in laboratory units, are applicable to boilers. In this work, data from laboratory units are compared with boiler data, and the accuracy of literature expressions for prediction of solids distribution, solids flow and wall layer thickness is reviewed. It is found that the height-to-width ratio does have a significant impact on the flow properties. Correlations based on experiments in laboratory units show poor agreement when applied to boilers. Modifications of literature expressions for prediction of solids flow and solids distribution are proposed, and an improved expression is formulated for prediction of the thickness of the wall layer.

  • 8.
    Johansson, Andreas
    et al.
    University of Borås, School of Engineering.
    Johnsson, Filip
    Niklasson, Fredrik
    Åmand, Lars-Erik
    Dynamics of furnace process in a CFB boiler2007In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 62, no 1-2, p. 550-560Article in journal (Refereed)
    Abstract [en]

    With the aim of understanding the dynamics of combustion, this work examines simultaneous fluctuations in fluid dynamic parameters and gas composition measured in a CFB furnace operated with coal as a fuel. The fluid dynamic parameters investigated are pressure and air flow entering the furnace. Gas composition was recorded by a zirconia-cell probe and a gas suction probe connected to a mass spectrometer having a high time resolution (10 Hz). The principal fluctuations detected are around I Hz and below 0.3 Hz. The fluctuations below 0.3 Hz mostly originate from variations in the fuel-feed rate. These variations create periods of reducing conditions caused by a momentarily high fuel input accompanied by a pressure rise in the furnace and a reduction of the air feed, which occurs concurrent with the release of an enhanced quantity of volatiles. Modelled pressure fluctuations based on the relation between volatile release and pressure in the furnace give similar pressure fluctuations as the measured pressure fluctuations, with respect to amplitude and characteristic time scale of the fluctuations. There is also a correlation between reducing conditions and the concentration of hydrocarbons. (c) 2006 Elsevier Ltd. All rights reserved.

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