Sökning: "pyrolysis"

Visar resultat 1 - 5 av 141 avhandlingar innehållade ordet pyrolysis.

  1. 1. Pyrolysis of biomass. Rapid pyrolysis at high temperature. Slow pyrolysis for active carbon preparation

    Författare :Rolando Zanzi; KTH; []
    Nyckelord :rapid pyrolysis; pyrolysis; wood; agricultural residues; biomass; char; tar; gas; char reactivity; gasification; steam; active carbon;

    Sammanfattning : Pyrolysis of biomass consists of heating solid biomass inthe absence of air to produce solid, liquid and gaseous fuels.In the first part of this thesis rapid pyrolysis of wood(birch) and some agricultural residues (olive waste, sugarcanebagasse and wheat straw in untreated and in pelletized form) athigh temperature (800ºC–1000ºC) is studied ina free fall reactor at pilot scale. LÄS MER

  2. 2. Fast pyrolysis of biomass : primary products and reaction pathways

    Författare :David Usino; Tobias Richards; Weihong Yang; Högskolan i Borås; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fast pyrolysis; Py-GC-MS FID; Primary reactions; Cellulose; Xylan; Lignin; Birch wood; Co-pyrolysis; Mahogany; Iroko; Palm kernel shell; Biomass blend; Biomass interaction; Pretreatment; Resource Recovery; Resursåtervinning;

    Sammanfattning : Pyrolysis of biomass to produce liquid fuel and chemicals has been considered as an alternativeto fossil fuel because biomass has a lower environmental impact; moreover, it is renewable andcould be sustainable. However, the process of bio-oil production involves a series of complexchemical reactions which are dependent on the biomass feedstock and composition,temperature, heating rate as well as residence time. LÄS MER

  3. 3. Principles of Biomass Pyrolysis with Emphasis on the Formation of the Nitrogen-Containing Gases HNCO, HCN and NH3

    Författare :Karl-Martin Hansson; Chalmers University of Technology; []
    Nyckelord :pyrolysis; depolymerisation; NH3; HCN; crack formation; fragmentation; combustion time; pyrolysis time; HNCO; biomass; shrinkage;

    Sammanfattning : This thesis investigates some aspects of the pyrolysis and combustion of biomass. The emphasis of the work is on the formation of nitrogen-containing species under pyrolysis. LÄS MER

  4. 4. Drying and Pyrolysis of Logs of Wood

    Författare :Jenny Larfeldt; Chalmers University of Technology; []
    Nyckelord :structural changes; heat transfer properties; pyrolysis; drying; single particle; wood;

    Sammanfattning : This work concerns log firing in small-scale boilers for house heating, which in Sweden meets a heat demand of 12 TWh a year. In boilers used for domestic central heating in the sizes of 10 to 30 kW the predominant combustion technique is grate firing. LÄS MER

  5. 5. Modelling of the pyrolysis of large wood particles

    Författare :Michel Bellais; Krister Sjöström; Björn Zethraeus; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; drying; modelling; pyrolysis; shrinkage; wood; Chemical energy engineering; Kemisk energiteknik;

    Sammanfattning : Wood is an interesting alternative to fossil fuels. It is CO2-neutral and widely available. However it is a difficult fuel to handle which features a low energy content. Thus technologies for wood thermal conversion need to be improved. LÄS MER