Sökning: "circulating fluidized beds"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden circulating fluidized beds.

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

    Författare :Anders Svensson; Chalmers University of Technology; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

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

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

    Sammanfattning : 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. LÄS MER

  3. 3. Gas mixing in circulating fluidised bed risers

    Författare :Johan Sternéus; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; circulating; dispersion; gas mixing; fluidization; tracer; wall-layer; fluidized beds;

    Sammanfattning : .... LÄS MER

  4. 4. Fluid Dynamics of the Transport Zone of Circulating Fluidized Beds - with Application to Boilers

    Författare :Wennan Zhang; Chalmers University of Technology; []
    Nyckelord :fluid dynamics; particle flux probe; momentum probe; circulating fluidized bed boilers; circulating fluidized beds; particle flow pattern; particle concentration probe; spectrum analysis;

    Sammanfattning : The particle suspension flow structure in circulating fluidized beds (CFB) was studied with emphasis on the layer of downflowing particles at the wall. The main experiments were carried out in the furnace of the 12 MWth CFB boiler of 1.7x1.7 m cross-section, and in a two-dimensional CFB cold bed of 0. LÄS MER

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

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

    Sammanfattning : 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. LÄS MER