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Visar resultat 1 - 5 av 11 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Internal Tar/CH4 Reforming in Biomass Dual Fluidised Bed Gasifiers towards Fuel Synthesis

    Författare :Kristina Göransson; Per Engstrand; Wennan Zhang; Kevin J Whitty; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Allothermal gasification; Bio-automotive fuels; Biomass gasification; Catalytic bed-material; Dual fluidised bed; Ni-catalyst; Syngas cleaning; Tar removal; Tar CH4 reforming;

    Sammanfattning : Production of high-quality syngas from biomass gasification in a dual fluidised bed gasifier (DFBG) has made a significant progress in R&D and Technology demonstration. An S&M scale bio-automotive fuel plant close to the feedstock resources is preferable as biomass feedstock is widely sparse and has relatively low density, low heating value and high moisture content. LÄS MER

  3. 2. A mechanistic description of the evolution of aromatic tar during catalytic upgrading of the raw gas produced from biomass steam gasification

    Författare :Huong Nguyen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; biomass gasification; raw gas; catalytic raw gas upgrading; ilmenite; kinetic model; tar;

    Sammanfattning : The removal of tar from the raw gas produced during biomass gasification is a prerequisite for the viability of the process downstream of the gasifier. The tar, the composition of which is dominated by aromatics, readily condenses, leading to process disruption. LÄS MER

  4. 3. Tar and Condensable Hydrocarbons in Indirect Gasification Systems

    Författare :Mikael Israelsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; UCS; Tar; condensable species; DFB; HTR.; CS; CLR; SPA;

    Sammanfattning : Biomass gasification, which is a primary process step in the production of biofuels, yields a combustible gas mixture (raw gas). This raw gas consists of a wide range of species, from permanent gases to condensable hydrocarbons, which are collectively known as tar. LÄS MER

  5. 4. Design and Operation of a Chemical-Looping Reformer for Catalytic Upgrading of Biomass-Derived Gas

    Författare :Fredrik Lind; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biomass gasification; Moisture measurements; Biomass combustion; Oxygen carriers; Ilmenite; Catalytic gas cleaning; CFB; Tar cleaning;

    Sammanfattning : AbstractThe removal of tar from the raw gas produced during biomass gasification is necessary before the gas can be used as a feedstock for synthetic fuels. The currently commercially available technologies for gas cleaning, i.e. LÄS MER

  7. 5. Strategies for controlling solid biomass conversion in dual fluidized bed gasifiers

    Författare :Teresa Berdugo Vilches; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; char gasification; operating conditions; steam reforming; feldspar.; bauxite; segregation; olivine; in situ gas upgrading; ilmenite; dual fluidized bed; tar removal;

    Sammanfattning : In the chemical industry, Synthesis Gas (syngas) has been traditionally produced by steam reforming of natural gas and naphtha. Steam gasification of biomass offers an alternative route for the production of syngas from renewable sources. LÄS MER