Search for dissertations about: "fluidized beds"

Showing result 1 - 5 of 57 swedish dissertations containing the words fluidized beds.

  1. 1. Fluid Dynamics of the Bottom Bed of Circulating Fluidized Bed Boilers

    Author : Anders Svensson; Chalmers University of Technology; []
    Keywords : fluidized beds; circulating fluidized bed boilers; fluctuations; fluidization regimes; bottom bed; bed porosity; fluid dynamics; bubbling beds; circulating fluidized beds; non-slugging; bed expansion; particle concentration;

    Abstract : The fluid dynamic conditions in the furnace of a fluidized bed boiler influence the combustion and the production of harmful emissions. A substantial amount of the bed material in a circulating fluidized bed (CFB) boiler is present as a dense bubbling bottom bed. READ MORE

  2. 2. Mixing of Large Solids in Fluidized Beds

    Author : Anna Köhler; Chalmers University of Technology; []
    Keywords : fluidized beds; fuel mixing; drag; semiempirical modelling; fluid-dynamic downscaling; magnetic particle tracking;

    Abstract : Fluidization is a technology that is widely used in systems in which particulate solids are to be transported, mixed, and/or reacted with gases. In fluidized bed applications, the lateral mixing rate of the solids and the heat and mass transfer with their surroundings play important roles in process performance. READ MORE

  3. 3. Nitrous Oxide Emission from Circulating Fluidized Bed Combustion

    Author : Lars-Erik Åmand; Chalmers University of Technology; []
    Keywords : air supply dependence; fluidized beds; homogeneous heterogeneous reactions; fluidized-bed boilers; bed temperature dependence; N2O emissions; circulating fluidized-bed boilers; gas-concentration profiles;

    Abstract : In the present thesis N2O results are presented from several measurement projects on two commercial circulating fluidized bed (CFB) boilers. Traditional parameter studies have been carried out, as well as test programs where various nitrogen-containing species were injected into the furnace or gas-concentration profiles in the combustion chamber were measured. READ MORE

  4. 4. Fluid dynamics and heat transfer in fluidized beds - with applications to boilers

    Author : Filip Johnsson; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; particle concentration; bed expansion; fluidized beds; non-slugging; fluidized bed boilers; tubes; fluid dynamics; fluidization regimes; bottom bed; internals; heat transfer; modelling;

    Abstract : .... READ MORE

  5. 5. Reduction of the N2O Emission from Fluidized Bed Combustion by Afterburning

    Author : Lennart Gustavsson; Chalmers University of Technology; []
    Keywords : chemical modelling; fuel injection; nitrous oxide; fluidized bed combustion; fluidized beds; afterburning; homogeneous heterogeneous reactions; N2O reduction; fluidized bed boiler; N2O emissions;

    Abstract : A method for reducing N2O emissions from fluidized bed combustion is presented and investigated. In contrast to flame combustion, fluidized bed combustion generates significant amounts of nitrous oxide (N2O) which are emitted to the atmosphere. READ MORE